JP6537380B2 - Attachment jig and attachment method for attaching a mounting member to the surface of a radioactive substance storage container, and a radioactive substance storage container unit including a radioactive substance storage container, a mounting member and a mounting jig - Google Patents

Description

  The present invention relates to a mounting jig and mounting method for mounting a mounting member on the surface of a radioactive substance storage container, and a radioactive substance storage container unit including a radioactive substance storage container, a mounting member and a mounting jig.

  In Patent Document 1, a temperature sensor is attached to the surface of a radioactive substance storage container, the temperature of the surface of the radioactive substance storage container is measured by the temperature sensor, and the sealing property abnormality of the canister is determined based on the measured temperature. Technology is disclosed.

JP 2005-308419 A

  Patent Document 1 does not show specific means (attachment jig or attachment method) for attaching a temperature sensor (attachment member) to the surface of a radioactive substance storage container. Depending on the mounting jig and mounting method, the following problems may occur.

  For example, when attaching a mounting member using a bolt, it may be necessary to provide a bolt hole in the surface of the radioactive substance storage container. Moreover, the structure which fixes an attachment jig | tool to the surface of a radioactive substance storage container by welding, and makes an attachment member hold | maintain between a mounting jig and the surface of a radioactive substance storage container is also considered. However, the surface of the radioactive substance storage container needs to be in a state where it is easy to remove the contamination by the radioactive substance as much as possible, and it is unsuitable to provide a bolt hole or to weld the surface.

  When attaching a mounting member using an adhesive tape, the adhesive tape is easily deteriorated due to the influence of the temperature of the radioactive substance storage container and the influence of radiation, and the holding of the mounting member on the surface of the radioactive substance storage container is extended for a long time It is difficult to maintain.

  The object of the present invention is that there is no need to provide a bolt hole or welding on the surface of the radioactive substance storage container, to suppress the deterioration of the mounting jig due to temperature and radiation, and to be attached to the surface of the radioactive substance storage container Attachment jig and method for attaching a mounting member to the surface of a radioactive substance storage container capable of maintaining holding of a member for a long time, and a radioactive substance storage container, mounting member and mounting jig And providing a radioactive substance storage container unit.

  According to a first aspect of the present invention, there is provided a mounting jig for mounting a mounting member on a surface of a radioactive substance storage container for containing a radioactive substance, wherein the surface has a portion made of a magnetic material, and the surface A mounting jig is provided, comprising: a magnet fixed by a magnetic force to the portion consisting of the magnetic body; and a holding space for holding the mounted member.

  According to a second aspect of the present invention, there is provided a mounting method for mounting a mounting member on a surface of a radioactive substance storage container for storing a radioactive substance, comprising a magnet and a holding space for holding the mounting member. A mounting method is provided, characterized in that the magnet is fixed by magnetic force to a portion made of a magnetic body on the surface while holding the mounting member in the holding space using the mounting jig.

  According to a third aspect of the present invention, there is provided a radioactive substance storage container for containing a radioactive substance, a mounting member mounted on the surface of the radioactive substance storage container, and a mounting jig for mounting the mounting member on the surface. A radioactive substance storage container unit comprising the magnetic substance, the surface having a portion made of a magnetic material, and the mounting jig being a magnet fixed by magnetic force to the portion made of the magnetic material on the surface; A radioactive substance storage container unit is provided, characterized in that it has a holding space for holding the attached member.

  In the present invention, "magnetic material" refers to a material that can be attracted by a magnet.

  According to the first to third aspects, the radiation property is achieved by adopting a configuration in which the magnet is fixed by magnetic force to the portion made of the magnetic material on the surface of the radioactive substance storage container while holding the mounting member in the holding space. There is no need to provide bolt holes or welds on the surface of the substance storage container. In addition, since no adhesive tape is used, deterioration of the mounting jig due to temperature or radiation can be suppressed, and retention of the mounting member on the surface of the radioactive substance storage container can be maintained for a long time .

  The mounting jig according to the present invention may further include a space forming member fixed to the magnet and having the holding space formed therein. According to this configuration, by forming the holding space in a member different from the magnet, it is possible to avoid a decrease in the fixing strength of the magnet to the surface of the radioactive substance storage container which may occur when the holding space is formed in the magnet. it can.

  In the mounting jig according to the present invention, the holding space is a recess formed on the surface of the space forming member facing the surface, and the space forming member has the recess formed on the surface facing the surface An area not being in contact with the surface may be configured to hold the attached member in a space defined by the recess and the surface. In order to securely hold the mounting member, it is conceivable to make the size of the recess slightly smaller than the size of the mounting member. When the recess is formed in the magnet, if the dimension of the recess is slightly smaller than the dimension of the mounting member, the magnet is lifted from the surface of the radioactive substance storage container, and the fixing strength of the magnet to the surface of the radioactive substance storage container is reduced. It can. On the other hand, if the recess is formed in the space forming member different from the magnet, the magnet may be lifted from the surface of the radioactive substance storage container even if the dimension of the recess is slightly smaller than the dimension of the mounting member It can be suppressed. Therefore, according to the above-mentioned composition, a mounting member can be held certainly, avoiding a fall of fixation intensity of a magnet to a surface of a radioactive material storage container.

  In the mounting jig according to the present invention, a screw hole is formed in any one of the magnet and a fixing member fixed to the magnet, and a pressure for pressing the space forming member toward the surface A member, a screwing portion screwed into the screw hole, and an end portion coming into contact with a surface of the space forming member opposite to the surface opposite to the surface nearer to the surface than the screwing portion And the pressing member. According to the said structure, a mounting member can be more reliably hold | maintained to the recessed part of a space formation member by pressing a space formation member by a press member.

  The mounting jig according to the present invention may further include a biasing member provided between the screwing portion and the end portion of the pressing member and biasing the space forming member toward the surface. According to this configuration, even when the pressing force by the pressing member is relaxed, the mounting member can be more reliably held in the recess of the space forming member by biasing the space forming member by the biasing member.

  In the mounting jig according to the present invention, the magnet may have a recess in a surface facing the surface, and the space forming member may be disposed in the recess.

  Furthermore, in the mounting jig according to the present invention, an area of the magnet fixed to the surface with respect to a center line of the magnet extending in a direction orthogonal to the surface contacts the surface of the space forming member The regions to be arranged may be arranged symmetrically. According to the said structure, a force acts with sufficient balance, fixation of the magnet with respect to the surface of a radioactive substance storage container, and the holding | maintenance of the to-be-attached member by a space formation member can be implement | achieved reliably.

  The space forming member may be disposed on a surface of the magnet opposite to the surface facing the surface, and the holding space may be a cavity formed in the space forming member.

  The holding space may be a recess formed on a surface of the magnet facing the surface. According to the configuration, by forming the holding space in the magnet, it is not necessary to separately provide a space forming member in which the holding space is formed, and the structure can be simplified.

  The mounting jig according to the present invention may further include a pole reversal mechanism for reversing the direction of the magnetic pole of the magnet. According to the said structure, attachment or detachment of the magnet with respect to the surface of a radioactive substance storage container can be performed easily.

  According to the present invention, the surface of the radioactive substance storage container is fixed by adopting a configuration in which the magnet is fixed to the portion of the surface of the radioactive substance storage container by the magnetic force while holding the mounting member in the holding space. There is no need to provide bolt holes or weld them. In addition, since no adhesive tape is used, deterioration of the mounting jig due to temperature or radiation can be suppressed, and retention of the mounting member on the surface of the radioactive substance storage container can be maintained for a long time .

It is a perspective view showing the radioactive material storage container unit concerning a 1st embodiment of the present invention. (A) is the schematic which shows the mounting jig which concerns on 1st Embodiment of this invention seen from the IIA direction of FIG. (B) is a cross-sectional view taken along the line IIB-IIB in FIG. (A) is the schematic corresponding to Fig.2 (a) which shows the attachment jig which concerns on 2nd Embodiment of this invention. (B) is a cross-sectional view taken along the line IIIB-IIIB in FIG. (A) is the schematic corresponding to Fig.2 (a) which shows the attachment jig based on 3rd Embodiment of this invention. (B) is a cross-sectional view taken along the line IVB-IVB of FIG. (A) is the schematic corresponding to Fig.2 (a) which shows the attachment jig which concerns on 4th Embodiment of this invention. FIG. 5B is a cross-sectional view along the line VB-VB in FIG.

  The radioactive substance storage container unit 1 according to the first embodiment of the present invention is, as shown in FIG. 1, a radioactive substance storage container (hereinafter simply referred to as a "container") 1x for storing a spent fuel 13x, and a container 1x. And a mounting jig 50 for mounting the temperature sensor 100 on the surface of the container 1x. The spent fuel 13x is an example of the "radioactive material" according to the present invention. The radioactive substance storage container unit 1 may be used, for example, for storage, transportation, etc. of the spent fuel 13x.

  The container 1x includes a bottomed cylindrical portion 10 having an open top and a lid 20 closing the top opening of the bottomed cylindrical portion 10.

  The bottomed cylindrical portion 10 has an inner cylinder 11 and an outer cylinder 12. The inner cylinder 11 has a bottomed cylindrical shape whose upper portion is open. The outer cylinder 12 has a cylindrical shape. The outer cylinder 12 is provided outside the inner cylinder 11 so as to be separated from the inner cylinder 11. Inside the inner cylinder 11, the basket 13 which accommodated the spent fuel 13x is arrange | positioned. A neutron shield 15 made of resin, rubber or the like is provided between the inner cylinder 11 and the outer cylinder 12. In the neutron shielding material 15, a heat transfer member 15x made of copper for transferring heat from the inner cylinder 11 to the outer cylinder 12 is provided in order to remove heat from decay of the spent fuel 13x. A plurality of trunnions 17 are provided on the side surface 12a of the outer cylinder 12 at predetermined intervals in the circumferential direction in the vicinity of the upper and lower portions, respectively. The trunnion 17 is gripped by a transfer crane or the like when moving the radioactive substance storage container unit 1.

  The lid 20 has a primary lid 21 closing the upper opening of the inner cylinder 11 and a secondary lid 22 provided above the primary lid 21.

  Each member of the container 1x (that is, the inner cylinder 11 and the outer cylinder 12 constituting the bottomed cylindrical portion 10, and the primary lid 21 and the secondary lid 22 constituting the lid 20) is made of carbon steel. Carbon steel is an example of the "magnetic body" according to the present invention. In the present embodiment, the entire surface of the container 1x is made of magnetic material.

  The temperature sensor 100 is an example of the “attachment member” according to the present invention, and is attached to a substantially central portion in the height direction on the side surface 12 a (a portion which becomes the highest temperature on the surface of the container 1 x) 12 ax. The side surface 12 a is an example of the “surface of the radioactive substance storage container” according to the present invention. The temperature sensor 100 is composed of a thermocouple and continuously (periodically) monitors the surface temperature of the container 1x during storage of the radioactive substance in order to monitor the integrity of the heat removal function and subcriticality maintenance function of the container 1x. Used to

  As shown in FIGS. 2A and 2B, the mounting jig 50 includes a magnet 51, a space forming member 52, a bolt 53, a coil spring 54, and a pair of magnetic pole reversing mechanisms 59.

  The magnet 51 has a substantially rectangular parallelepiped shape. A recess 51 x is formed on the lower surface (surface facing the side surface 12 a) 51 b of the magnet 51. The recess 51 x penetrates the magnet 51 along the extension direction of the temperature sensor 100. In the lower surface 51b of the magnet 51, the region where the recess 51x is not formed is fixed to the side surface 12a by the magnetic force. Further, in the magnet 51, a screw hole 51y is formed at a central portion in a plane parallel to the side surface 12a. The screw holes 51y extend in the direction orthogonal to the side surface 12a from the upper surface 51a (surface opposite to the surface facing the side surface 12a) 51a to the recess 51x. The recess 51x is in communication with the outside of the magnet 51 via the screw hole 51y. As the magnet 51, either a permanent magnet or an electromagnet may be used.

  The space forming member 52 has a substantially rectangular parallelepiped shape. A recess 52 x for holding the temperature sensor 100 is formed on the lower surface (surface facing the side surface 12 a) 52 b of the space forming member 52. The lower surface 52 b of the space forming member 52 is in contact with the side surface 12 a in the region where the recess 52 x is not formed. The recess 52x is closed by the side surface 12a. The space forming member 52 is configured to hold the temperature sensor 100 in the space defined by the recess 52 x and the side surface 12 a. The space forming member 52 is disposed in the recess 51 x of the magnet 51 and fixed to the magnet 51 via a bolt 53.

  As shown in FIG. 2B, with respect to the center line O of the magnet 51 extending in the direction orthogonal to the side surface 12a, a region fixed to the side surface 12a of the magnet 51 and a contact with the side surface 12a of the space forming member 52 The regions to be arranged are arranged symmetrically.

  The bolt 53 is an example of the “pressing member” according to the present invention, and presses the space forming member 52 toward the side surface 12 a. The bolt 53 has a cylindrical screw portion 53t inserted through the screw hole 51y. A screw groove is formed on the entire peripheral surface of the screw portion 53t, and a screwing portion 53ta screwed into the screw hole 51y and an upper surface (side surface 12a of the space forming member 52 closer to the side surface 12a than the screwing portion 53ta. And an end 53 tb in contact with the opposite surface 52 a).

  The coil spring 54 is an example of the “biasing member” according to the present invention, and is provided between the screwing portion 53 ta and the end portion 53 tb of the bolt 53 and biases the space forming member 52 toward the side surface 12 a. . The coil spring 54 is wound around the peripheral surface of a portion below the screwing portion 53ta in the screw portion 53t.

  The pair of magnetic pole inversion mechanisms 59 is point-symmetrical to the center of the magnet 51 in a plane parallel to the side surface 12a (on the diagonal of the square magnet 51 when viewed from the direction orthogonal to the side surface 12a). Each of the magnetic pole inversion mechanisms 59 has a cylindrical rotary magnet 59 a embedded inside the magnet 51 and a lever 59 b drawn to the outside of the magnet 51 from the circumferential surface of the rotary magnet 59 a. The rotary magnet 59a is rotatable around an axis in a direction orthogonal to the side surface 12a. When the rotary magnet 59a is rotated using the lever 59b, the direction of the magnetic field of the rotary magnet 59a changes. When the direction of the magnetic field of the rotary magnet 59a is the same as the direction of the magnetic field of the magnet 51, the fixing strength with the side surface 12a by the magnetic force of the magnet 51 is maximized, and the magnet 51 is firmly fixed to the side surface 12a. On the other hand, when the direction of the magnetic field of the rotary magnet 59a is opposite to the direction of the magnetic field of the magnet 51, the magnet in the case where the direction of the magnetic field of the rotary magnet 59a is the same as the direction of the magnetic field of the magnet 51 The direction of the magnetic pole 51 is reversed (that is, the direction of the magnetic pole is reversed). In this case, the fixing strength with the side surface 12 a by the magnetic force of the magnet 51 is minimized, and the magnet 51 is easily separated from the side surface 12 a. As described above, each magnetic pole inversion mechanism 59 is configured to invert the direction of the magnetic pole of the magnet 51.

  Among the components of the mounting jig 50, components other than the magnet 51 and the rotary magnet 59a are made of nonmagnetic material in order to prevent the magnet 51 from being magnetized. Specifically, the bolt 53 and the coil spring 54 are made of stainless steel, and the space forming member 52 and the lever 59b are made of stainless steel or an aluminum alloy.

  When attaching the temperature sensor 100 to the side surface 12a, the magnet 51 is fixed to the side surface 12a by a magnetic force while holding the temperature sensor 100 in the recess 52x. Specifically, for example, the space forming member 52 is disposed on the side surface 12a in a state where the temperature sensor 100 is held in the recess 52x. Thereafter, the magnet 51 is disposed on the side surface 12a so as to cover the space forming member 52 in a state in which the magnet 51 and the bolt 53 are integrated by screwing the screwing portion 53ta into the screw hole 51y. The magnet 51 is fixed by magnetic force. Alternatively, first, the upper surface 52a of the space forming member 52 is fixed to the end portion 53tb of the screw portion 53t, and the screw portion 53ta is screwed into the screw hole 51y, whereby the magnet 51, the bolt 53 and the space forming member 52 are formed. And unite. Thereafter, by arranging the one-piece on the side surface 12a, the temperature sensor 100 is held in the recess 52x, and the magnet 51 is fixed to the side surface 12a by a magnetic force. Further, by tightening the bolt 53, the space forming member 52 is pressed toward the side surface 12a, the recess 52x is reliably closed by the side surface 12a, and the temperature sensor 100 is in the space defined by the recess 52x and the side surface 12a. Is securely held. In addition, while the work of attaching the temperature sensor 100 to the side surface 12a is performed, the rotary magnet 59a of each magnetic pole reversal mechanism 59 is held at the position where the direction of the magnetic field of the rotary magnet 59a is the same as the direction of the magnetic field of the magnet 51 Be done.

  When removing the temperature sensor 100 from the side surface 12a, the lever 59b of each magnetic pole reversing mechanism 59 is used to rotate the rotary magnet 59a so that the direction of the magnetic field of the rotary magnet 59a is opposite to the direction of the magnetic field of the magnet 51. . Thereby, the magnet 51 is easily detached from the side surface 12a, and the operator can easily remove the temperature sensor 100 from the side surface 12a.

  As described above, according to the present embodiment, the configuration is adopted in which the magnet 51 is fixed by magnetic force to the portion of the side surface 12a of the container 1x made of magnetic material while holding the temperature sensor 100 in the recess 52x. Thus, there is no need to provide a bolt hole in the side surface 12a or perform welding. Further, since no adhesive tape is used, deterioration of the mounting jig due to temperature or radiation can be suppressed, and the holding of the temperature sensor 100 on the side surface 12a can be maintained for a long time.

  The mounting jig 50 according to the present embodiment further includes a space forming member 52 fixed to the magnet 51 and in which a recess 52 x is formed. According to the configuration, the holding space (recessed portion 52x) is formed in a member (space forming member 52) different from the magnet 51, so that the magnet 51 with respect to the side surface 12a may be generated when the holding space is formed in the magnet 51. It is possible to avoid a decrease in fixation strength.

  In the mounting jig 50 according to the present embodiment, the holding space for holding the temperature sensor 100 is a recess 52 x formed on the surface of the space forming member 52 facing the side surface 12 a. The space forming member 52 is configured to contact the side surface 12 a with a region where the recess 52 x is not formed on the surface facing the side surface 12 a and to hold the temperature sensor 100 in the space defined by the recess 52 x and the side surface 12 a. ing. In order to hold the temperature sensor 100 reliably, it is conceivable to make the size of the recess 52 x slightly smaller than the size of the temperature sensor 100. In the case where the holding space (recessed portion 52x) is formed in the magnet 51, if the dimension of the recessed portion 52x is slightly smaller than the dimension of the temperature sensor 100, the magnet 51 is lifted from the side surface 12a and the fixing strength of the magnet 51 with respect to the side surface 12a is It can decrease. On the other hand, if the recess 52x is formed in the space forming member 52 different from the magnet 51, the magnet 51 is lifted from the side surface 12a even if the dimension of the recess 52x is slightly smaller than the dimension of the temperature sensor 100. Can be suppressed. Therefore, according to the said structure, the temperature sensor 100 can be hold | maintained reliably, avoiding the fall of the fixed intensity of the magnet 51 with respect to the side surface 12a.

  The mounting jig 50 according to the present embodiment has a screw hole 51y formed in the magnet 51 and is a bolt 53 for pressing the space forming member 52 toward the side surface 12a, and is screwed into the screw hole 51y. It further comprises a bolt 53 having a portion 53 ta and an end portion 53 tb in contact with a surface opposite to the surface facing the side surface 12 a in the space forming member 52 closer to the side surface 12 a than the screwing portion 53 ta. According to the configuration, by pressing the space forming member 52 with the bolt 53, the temperature sensor 100 can be more reliably held in the recess 52x of the space forming member 52.

  The attachment jig 50 according to the present embodiment further includes a coil spring 54 provided between the screwing portion 53 ta and the end portion 53 tb of the bolt 53 and biasing the space forming member 52 toward the side surface 12 a. . According to this configuration, even when the pressing force by the bolt 53 is relaxed, the temperature sensor 100 is more reliably held in the recess 52x of the space forming member 52 by urging the space forming member 52 with the coil spring 54. Can.

  In the mounting jig 50 according to the present embodiment, the magnet 51 has a recess 51x on the surface facing the side surface 12a, and the space forming member 52 is disposed in the recess 51x. Further, with respect to the center line O of the magnet 51 extending in the direction orthogonal to the side surface 12a, the region fixed to the side surface 12a in the magnet 51 and the region contacting the side surface 12a in the space forming member 52 are respectively arranged symmetrically It is done. According to the configuration, the force acts in a well-balanced manner, and both the fixation of the magnet 51 to the side surface 12 a and the holding of the temperature sensor 100 by the space forming member 52 can be reliably realized.

  The mounting jig 50 according to the present embodiment further includes a magnetic pole reversing mechanism 59 that reverses the direction of the magnetic pole of the magnet 51. According to the said structure, attachment or detachment of the magnet 51 with respect to the side surface 12a can be performed easily.

  Subsequently, a mounting jig 250 according to a second embodiment of the present invention will be described.

  As shown in FIGS. 3A and 3B, the mounting jig 250 includes a magnet 251, a space forming member 252, a bolt 252, a coil spring 254, a fixing member 255, and the magnetic pole reversing mechanism 59 of the first embodiment. And the same mechanism (not shown).

  Similar to the magnet 51 of the first embodiment, the magnet 251 has a substantially rectangular parallelepiped shape, but unlike the magnet 51 of the first embodiment, the recess 51 x is formed on the lower surface (surface facing the side surface 12 a) 251 b of the magnet 251. Not formed. The lower surface 251 b of the magnet 251 is flat, and the entire region is fixed to the side surface 12 a by magnetic force. Further, four pin holes 251 y are formed as blind holes in the upper surface (the surface opposite to the surface facing the side surface 12 a) 251 a of the magnet 251. As the magnet 251, either of a permanent magnet and an electromagnet may be used as in the case of the magnet 51 of the first embodiment.

  Fixing member 255 is made of a flat plate, and has a region overlapping with magnet 251 and a region not overlapping with magnet 251 (a region extending to the side of magnet 251) when viewed from the direction orthogonal to side surface 12a. Four pin holes 255 x are formed in a region overlapping the magnet 251 in the fixing member 255. Each pin hole 255x is located at a position corresponding to each pin hole 251y, and extends from the upper surface (surface opposite to the surface facing the side surface 12a) 255a of the fixing member 255 to the lower surface (surface facing the side surface 12a) 255b. The fixing member 255 is penetrated in the thickness direction up to the end. The fixing member 255 can be fixed to the magnet 251 by inserting the pin 256 into each combination of the pin hole 251 y and the pin hole 255 x in a state where the fixing member 255 is disposed on the upper surface 251 a of the magnet 251. That is, the fixing member 255 is an example of the “fixing member fixed to the magnet” according to the present invention. A screw hole 255y is formed in a region where the fixing member 255 does not overlap with the magnet 251. The screw hole 255y penetrates the fixing member 255 in the thickness direction from the upper surface 255a to the lower surface 255b of the fixing member 255.

  The space forming member 252 has substantially the same configuration as the space forming member 52 of the first embodiment, and has a rectangular parallelepiped shape. A recess 252 x for holding the temperature sensor 100 is formed in the lower surface (the surface facing the side surface 12 a) 252 b of the space forming member 252. The lower surface 252b of the space forming member 252 is in contact with the side surface 12a in the region where the recess 252x is not formed. The recess 252x is closed by the side surface 12a. The space forming member 252 is configured to hold the temperature sensor 100 in the space defined by the recess 252x and the side surface 12a. The space forming member 252 is disposed to the side of the magnet 251, and is fixed to the magnet 251 via the fixing member 255, the pin 256 and the bolt 253.

  The bolt 253 is an example of the “pressing member” according to the present invention, and presses the space forming member 252 toward the side surface 12 a. The bolt 253 has the same configuration as the bolt 53 of the first embodiment, and has a cylindrical screw portion 253t inserted through the screw hole 255y. A screw groove is formed on the entire circumferential surface of the screw portion 253t, and a screwing portion 253ta screwed into the screw hole 255y and an upper surface (side surface 12a of the space forming member 252 closer to the side surface 12a than the screwing portion 253ta. And an end 253 tb in contact with the opposite surface) 252a.

  The coil spring 254 is an example of the “biasing member” according to the present invention, and is provided between the screwing portion 253 ta and the end portion 253 tb of the bolt 253 and biases the space forming member 252 toward the side surface 12 a. . The coil spring 254 has the same configuration as the coil spring 54 of the first embodiment, and is wound around the peripheral surface of a portion below the screwing portion 253ta in the screw portion 253t.

  Among the components of the mounting jig 250, components other than the magnet 251 and the rotary magnet 59a are made of nonmagnetic material in order to prevent the magnet 251 from being magnetized. Specifically, the bolt 253 and the coil spring 254 are made of stainless steel, and the fixing member 255, the space forming member 252 and the lever 59b are made of stainless steel or an aluminum alloy.

  When attaching the temperature sensor 100 to the side surface 12a, the magnet 251 is fixed to the side surface 12a by a magnetic force while holding the temperature sensor 100 in the recess 252x. Specifically, for example, the space forming member 252 is disposed on the side surface 12a in a state where the temperature sensor 100 is held in the recess 252x. Thereafter, the fixing member 255 is fixed on the magnet 251 and the screwing portion 253ta is screwed into the screw hole 255y, whereby the magnet 251 is fixed to the side surface 12a with the fixing member 255 and the bolt 253 integrated. The magnet 251 is fixed to the side surface 12a by a magnetic force. Alternatively, first, the upper surface 252a of the space forming member 252 is fixed to the end 253tb of the screw portion 253t, the fixing member 255 is fixed on the magnet 251, and the screwing portion 253ta is screwed into the screw hole 255y. The magnet 251, the fixing member 255, the bolt 253, and the space forming member 252 are integrated. Thereafter, by arranging the one piece on the side surface 12a, the temperature sensor 100 is held in the recess 252x, and the magnet 251 is fixed to the side surface 12a by a magnetic force. Further, by tightening the bolt 253, the space forming member 252 is pressed toward the side surface 12a, the recess 252x is reliably closed by the side surface 12a, and the temperature sensor 100 is in the space defined by the recess 252x and the side surface 12a. Is securely held. While the temperature sensor 100 is attached to the side surface 12a, the rotary magnet 59a of the magnetic pole reversing mechanism 59 is held at the same position as the direction of the magnetic field of the magnet 251. Ru.

  When removing the temperature sensor 100 from the side surface 12a, the lever 59b of the magnetic pole reversing mechanism 59 is used to rotate the rotary magnet 59a so that the direction of the magnetic field of the rotary magnet 59a is opposite to the direction of the magnetic field of the magnet 251. As a result, the magnet 251 is easily detached from the side surface 12a, and the operator can easily remove the temperature sensor 100 from the side surface 12a.

  As described above, according to this embodiment, it is possible to obtain the same effect based on the same configuration as that of the first embodiment.

  Subsequently, a mounting jig 350 according to a third embodiment of the present invention will be described.

  The mounting jig 350 has a mechanism (not shown) similar to the magnet 351 and the pole reversal mechanism 59 of the first embodiment, as shown in FIGS. 4 (a) and 4 (b).

  The magnet 351 has a substantially rectangular parallelepiped shape as the magnet 51 of the first embodiment. Unlike the magnet 51 of the first embodiment, the recess 51x is not formed on the lower surface (the surface facing the side surface 12a) 351b of the magnet 351, and the recess 351x for holding the temperature sensor 100 is formed. There is. In the lower surface 351b of the magnet 351, a region where the recess 351x is not formed is fixed to the side surface 12a by a magnetic force. The upper surface (surface opposite to the surface facing the side surface 12a) 351a of the magnet 351 is flat, and no bolt or pin is provided. Similar to the magnet 51 of the first embodiment, either a permanent magnet or an electromagnet may be used as the magnet 351.

  The size of the recess 351 x is slightly smaller than the size of the temperature sensor 100 in order to reliably hold the temperature sensor 100.

  When attaching the temperature sensor 100 to the side surface 12a, the magnet 351 is fixed to the side surface 12a by a magnetic force while holding the temperature sensor 100 in the recess 351x. As a result, the recess 351x is closed by the side surface 12a, and the temperature sensor 100 is held in the space defined by the recess 351x and the side surface 12a. During the work of attaching the temperature sensor 100 to the side surface 12a, the rotary magnet 59a of the pole reversal mechanism 59 is held at the same position as the direction of the magnetic field of the magnet 351. Ru.

  When removing the temperature sensor 100 from the side surface 12a, the lever 59b of the magnetic pole reversing mechanism 59 is used to rotate the rotary magnet 59a so that the direction of the magnetic field of the rotary magnet 59a is reverse to the direction of the magnetic field of the magnet 351. As a result, the magnet 351 is easily detached from the side surface 12a, and the operator can easily remove the temperature sensor 100 from the side surface 12a.

  As described above, according to the present embodiment, in addition to the same effects based on the same configuration as the first embodiment, the following effects can be obtained. That is, in the present embodiment, the holding space for holding the temperature sensor 100 is the recess 351 x formed on the surface of the magnet 351 facing the side surface 2 a. According to the said structure, by forming holding space in the magnet 351, it is not necessary to provide separately the space formation member in which the holding space was formed, and a structure can be simplified.

  Subsequently, a mounting jig 450 according to a fourth embodiment of the present invention will be described.

  As shown in FIGS. 5 (a) and 5 (b), the mounting jig 450 has a mechanism (not shown) similar to the magnet 451, the space forming members 452p and 452q, and the pole reversal mechanism 59 of the first embodiment. Have.

  Similar to the magnet 51 of the first embodiment, the magnet 451 has a substantially rectangular parallelepiped shape, but unlike the magnet 51 of the first embodiment, the recess 51x is formed on the lower surface (surface facing the side surface 12a) 451b of the magnet 451. Not formed. The lower surface 451 b of the magnet 451 is flat, and the entire region is fixed to the side surface 12 a by magnetic force. Further, two pin holes 451 y are formed as blind holes in the upper surface (surface opposite to the surface facing the side surface 12 a) 451 a of the magnet 451. As the magnet 451, any of a permanent magnet and an electromagnet may be used as in the magnet 51 of the first embodiment.

  The space forming member 452p is disposed such that the lower surface (the surface facing the side surface 12a) 452pb is in contact with the upper surface 451a of the magnet 451, and the thickness is small on both sides of the central portion where the concave portion 452px is provided and the central portion It has two side parts. Pin holes 452 py are formed on each side of the space forming member 452 p. Each pin hole 452 py is located at a position corresponding to each pin hole 451 y and penetrates the side portion of the space forming member 452 p in the thickness direction. Fixing the space forming member 452 p to the magnet 451 by inserting the pin 456 into each combination of the pin hole 451 y and the pin hole 452 py with the space forming member 452 p disposed on the upper surface 451 a of the magnet 451 it can. In the central portion of the space forming member 452p, the recess 452px is formed on the upper surface (surface opposite to the surface facing the side surface 12a) 452pa. The recess 452 px constitutes a part of a holding space for holding the cable protection tube 200. The cable protection pipe 200 is a pipe that accommodates cables connected to various sensors, and is another example of the “attachment member” according to the present invention. In the upper surface 452pa of the central portion of the space forming member 452p, two pin holes 452pz are formed on both sides of the recess 452px.

  Space forming member 452 q is disposed such that lower surface (surface facing side surface 12 a) 452 qb is in contact with upper surface 452 pa of space forming member 452 p, and the thickness is provided at both the central portion provided with concave portion 452 qx and the central portion Have two smaller side parts. Pin holes 452 qz are formed in the side portions of the space forming member 452 q. Each pin hole 452 qz is located at a position corresponding to each pin hole 452 pz, and penetrates the side portion of the space forming member 452 q in the thickness direction. With the space forming member 452 q disposed on the upper surface 452 pa of the space forming member 452 p, the space forming member 452 q is inserted into the space forming member 452 p by inserting the pins 456 into the respective combinations of the pin holes 452 pz and the pin holes 452 qz. It can be fixed. The central portion of the space forming member 452 q has a curved shape such that the upper surface (the surface opposite to the surface facing the side surface 12 a) 452 qa is convex upward, and the lower surface 452 qb has a recessed portion 452 qx . The recess 452 qx constitutes a part of a holding space for holding the cable protection tube 200. A combination of the recess 452 qx and the recess 452 px forms a cylindrical space, and the cable protection pipe 200 is held in the space.

  As described above, the space forming member (an integral body of two space forming members 452 p and 452 q) is disposed on the upper surface (the surface opposite to the surface facing the side surface 12 a) of the magnet 451. In addition, the holding space for holding the temperature sensor 100 is a combination of a hollow portion (concave portion 452 qx and a concave portion 452 px) formed inside a space forming member (an integral body of two space forming members 452 p and 452 q). It is a cylindrical space to be formed.

  Among the components of the mounting jig 450, components other than the magnet 451 and the rotary magnet 59a are made of nonmagnetic material in order to prevent the magnet 451 from magnetizing. Specifically, the space forming members 452p and 452q are made of stainless steel or aluminum alloy.

  When attaching the cable protection pipe 200 to the side surface 12a, the magnet 451 is fixed to the side surface 12a by a magnetic force while holding the cable protection pipe 200 in the concave portions 452px and 452qx. Specifically, for example, first, the magnet 451 and the space forming members 452 p and 452 q are fixed to each other with the pin 456 in a state where the cable protection pipe 200 is held in the cylindrical holding space formed of a combination of the concave portions 452 x and 452 qx. Together. Thereafter, the one-piece assembly is disposed on the side surface 12a, and the magnet 451 is fixed to the side surface 12a by a magnetic force. Alternatively, first, the magnet 451 is disposed on the side surface 12a, and the magnet 451 is fixed to the side surface 12a by a magnetic force. Thereafter, the space forming member 452p is fixed on the magnet 451 by the pin 456, the cable protection tube 200 is disposed in the recess 452px, and then the space forming member 452q is fixed on the space forming member 452p by the pin 456. While the cable protection tube 200 is attached to the side surface 12a, the rotary magnet 59a of the magnetic pole reversing mechanism 59 is held at the same position as the direction of the magnetic field of the magnet 451. Be done.

  When removing the cable protection pipe 200 from the side surface 12a, the lever 59b of the magnetic pole reversing mechanism 59 is used to rotate the rotary magnet 59a to reverse the direction of the magnetic field of the rotary magnet 59a to the direction of the magnetic field of the magnet 451. . As a result, the magnet 451 is easily detached from the side surface 12a, and the operator can easily remove the cable protection pipe 200 from the side surface 12a.

  As described above, according to the present embodiment, the same effect can be obtained based on the same configuration as that of the first embodiment.

  As mentioned above, although the preferred embodiment of the present invention was described, the present invention is not limited to the above-mentioned embodiment, for example, various design changes can be made within the scope of claims as described below. It is a thing.

The radioactive substance stored in the radioactive substance storage container is not limited to the spent fuel, and may be any radioactive substance generated artificially or naturally.
The radioactive substance storage container is not limited to a cylindrical shape, and may be, for example, a rectangular shape.
The surface (surface) to which the mounting member is attached in the radioactive substance storage container is not limited to the side surface, and may be the bottom surface, the top surface, or the like.
The magnetic body is not limited to carbon steel, and may be any material that can be attracted by a magnet (eg, iron, nickel, cobalt, chromium, other alloys, etc.).
The portion other than the portion to which the magnet is fixed on the surface of the radioactive substance storage container may be made of nonmagnetic material.
The mounted member is not limited to the one exemplified in the above-described embodiment, and a temperature sensor composed of something other than a thermocouple, a sensor other than a temperature sensor (for example, a pressure sensor), a cable connected to various sensors, etc. It may be any member that needs to be attached to the surface of the radioactive substance storage container.
The shape and size of the magnet and the holding space can be arbitrarily changed according to the form of the mounted member.
The holding space may be formed in any of the magnet and the member other than the magnet. Also, the holding space may be provided across one or more members.
The space forming member may be made of any material and may be a magnet.
The pressing member and / or the biasing member may be omitted.
The magnetic pole inversion mechanism is not limited to being provided as a pair, and only one may be provided. Moreover, as long as it is comprised so that the direction of the magnetic pole of a magnet may be reversed, a magnetic pole inversion mechanism is not limited to a structure like the above-mentioned embodiment, You may employ | adopt arbitrary mechanisms. The pole reversal mechanism may be omitted.
-Parts other than the magnet contained in a mounting jig may consist of arbitrary materials.

1 radioactive substance storage container unit 1x radioactive substance storage container 12a side surface (surface)
13x spent fuel (radioactive material)
50; 250; 350; 450 mounting jigs 51; 251; 351; magnets 51x dents 51y; 255y screw holes 52; 252; 452p; 452q space forming members 52x; 252x; 351x; 452px, 452qx concave portions (holding space)
53; 253 bolt (pressing member)
53ta; 253ta threaded portion 53tb; 253tb end 54; 254 coil spring (biasing member)
255 fixing member 59 magnetic pole reversal mechanism 100 temperature sensor (attachment member)
200 Cable Protective Pipe (Attachment Material)
O Magnet center line

Claims (7)

A mounting jig for mounting a mounting member on the surface of a radioactive substance storage container for containing a radioactive substance, the mounting jig comprising:
The surface has a portion made of a magnetic material,
A magnet fixed by a magnetic force to a portion of the surface made of the magnetic material, the magnet having a recess on the surface facing the surface;
And a space forming member fixed to the magnet and having a holding space for holding the attached member.
The holding space is a recess formed in a surface facing the surface of the space forming member,
The space forming member is disposed in the recess, and in a surface opposite to the surface, a region where the recess is not formed is in contact with the surface and is defined by the recess and the surface A mounting jig characterized in that the mounting member is held in a space. A screw hole is formed in the magnet,
A pressing member for pressing the space forming member toward the surface, a screwing portion screwed into the screw hole, and the surface facing the space forming member closer to the surface than the screwing portion The mounting jig according to claim 1, further comprising a pressing member having an end portion contacting the opposite surface and the end surface.   3. The apparatus according to claim 2, further comprising a biasing member provided between the screwing portion and the end portion of the pressing member and biasing the space forming member toward the surface. Mounting jig.   With respect to a center line of the magnet extending in a direction orthogonal to the surface, a region fixed to the surface in the magnet and a region in contact with the surface in the space forming member are arranged symmetrically. The attachment jig according to any one of claims 1 to 3, characterized in that. The mounting jig according to any one of claims 1 to 4 , further comprising a magnetic pole inversion mechanism for inverting the direction of the magnetic pole of the magnet. A mounting method for mounting a mounting member on a surface of a radioactive substance storage container for containing a radioactive substance, the mounting method comprising:
Using a mounting jig including a magnet having a recess on a surface facing the surface, and a space forming member in which a holding space for holding the attached member is formed,
The holding member is held in a recess as the holding space formed on the surface of the space forming member facing the surface, and the space forming member is covered with the magnet so as to cover the space forming member. While arranging the space forming member, the space forming member is fixed to the magnet, and the magnet is fixed to the portion of the surface made of the magnetic body by a magnetic force, and the recess is formed on the surface facing the surface And attaching the region of the space forming member which is not formed to the surface, and holding the attached member in a space defined by the recess and the surface. A radioactive substance storage container for containing radioactive substances,
A mounting member attached to a surface of the radioactive substance storage container having a portion made of a magnetic material;
The mounting jig according to any one of claims 1 to 5 , for mounting the mounting member on the surface.
Radioactive substance storage container unit equipped with

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