JP6076697B2 - Steam generator transportation method - Google Patents

Description

  The present invention relates to a steam generator transport method for transporting a used steam generator.

  For example, a steam generator as a heat exchanger used in a pressurized water reactor (PWR) is provided with a heat transfer tube, a steam / water separator, and a moisture separator inside a substantially sealed body. ing. In this steam generator, high-temperature primary cooling water pressurized from the reactor flows through the heat transfer tubes and is returned to the reactor. And since the said heat exchanger tube is heated when a primary cooling water flows into a heat exchanger tube, the secondary coolant introduced in the trunk | drum is heated and it is set as a vapor | steam.

  This steam generator is removed at the time of replacement or when the reactor is decommissioned. As described above, in the steam generator, since the primary cooling water from the nuclear reactor passes through the inside of the heat transfer tube, the heat transfer tube is exposed to radiation and includes radioactivity. Therefore, generally, the removed steam generator is stored as radioactive waste in a storage in the nuclear power generation facility as it is (see, for example, Patent Document 1).

  By the way, the steam generator is, for example, a large one with an outer diameter of 4.5 m, a length (height) of 21 m, and a weight of 300 t. To store the steam generator as it is in a storage in the nuclear power generation facility, the steam generator is large. A vault is required. However, since it is assumed that the number of steam generators to be stored will increase in the future, it is necessary to prepare a larger storage, but it is necessary to secure a place for a larger storage in the nuclear power generation facility. It is a difficult situation.

  For this reason, it is considered to dismantle the steam generator, reduce the volume of radioactive waste, and dispose of it. In this case, the steam generator is in a state in which the length direction is set horizontally, and the upper body is provided with the steam separator and the moisture separator, and the lower part is provided with the heat transfer tube. It is cut into cylinders, each of which is cut into smaller pieces and disassembled (see, for example, Patent Document 2).

JP-A-8-43577 JP 2011-33349 A

  By the way, when dismantling a steam generator like patent document 2, in the environment where the overhead crane is not installed in the storage like patent document 1, or the overhead crane cannot be installed, the dismantling in the storage is Have difficulty. Therefore, the steam generator is transported by the transport vehicle from the storage to another dismantling location and dismantled at the dismantling location. However, in a nuclear power generation facility, if the entrance to the dismantling place is narrow or the vicinity of the entrance to the dismantling place is so narrow that the steam generator cannot be routed, transport the steam generator as it is and carry it to the dismantling place. I can't.

  This invention solves the subject mentioned above, and aims at providing the steam generator conveyance method which can convey a steam generator rationally.

  In order to achieve the above-mentioned object, the steam generator carrying method of the first invention is such that a large number of heat transfer tubes formed in an inverted U shape on the lower body side of the tubular body portion are tube-group outer cylinders. In a method of transporting a steam generator that is supported in an enclosed state and further provided with a steam separator and a moisture separator on the upper trunk side of the trunk section, the steam generator is placed horizontally. And cutting and dividing the lower body and the upper body along the circumference of the body part, and then shielding and sealing the cut part of the lower body and cutting the upper body And a step of transporting the lower body side and the upper body side to a predetermined dismantling place by a transport vehicle, respectively.

  According to this steam generator transport method, the steam generator is divided into a lower trunk side and an upper trunk side, so that the entrance of the dismantling place is narrow or the vicinity of the entrance of the dismantling place is narrow and the steam generator is routed. If this is not possible, the steam generator can be transported and transported to the dismantling site. In particular, in this steam generator transport method, the lower body and the upper body are cut and divided along the circumference of the body. For this reason, since the lower body and the upper body can be divided so that the heat transfer tubes supported in the lower body are not cut, the heat transfer tubes contaminated with radiation through the primary cooling water are not cut as they are. And by cutting and sealing the cut part of the lower body, it can be transported to a dismantling place in a safe state.

  The steam generator transport method according to a second aspect of the present invention is the steam generator transport method according to the first aspect, wherein the upper body of the steam generator is formed to have an outer shape larger than the lower body, and the lower body and the upper body A conical cone cylinder is provided between the lower cylinder and the upper cylinder when the lower cylinder and the upper cylinder are divided.

  According to this steam generator transport method, by dividing the steam generator into the lower trunk side and the upper trunk side by cutting between the lower trunk and the conical cylinder, the outer shape of the lower trunk side becomes small, When the entrance of the dismantling place is narrow, it can be easily carried into the dismantling place.

  Moreover, the steam generator carrying method of 3rd invention is a 1st or 2nd invention. WHEREIN: The closing part which shields and seals the cutting part of the said lower trunk | butt is matched and welded to the cut surface of the said cutting part. It is characterized by.

  According to this steam generator transport method, the lower body having the heat transfer tube contaminated with radiation through the primary cooling water needs to be shielded and sealed with the closed portion. Can be transported without enlarging the outer shape of the lower body, and can be easily carried into a dismantling place.

  The steam generator carrying method according to the fourth invention is characterized in that, in the third invention, when the lower body and the upper body are divided, they are cut by mechanical cutting.

  According to this steam generator carrying method, the cut surface of the cut portion of the lower trunk is substantially smoothed by mechanical cutting, so that the closing portion can be brought into contact with the cut surface of the cut portion to facilitate welding.

  In the steam generator carrying method of the fifth invention, in the first or second invention, a closing portion that shields and seals the cut portion of the lower body is formed so as to cover the cut portion, and the lower portion It welds with respect to the outer periphery of a trunk | drum.

  According to this steam generator transport method, the lower body having the heat transfer tube contaminated with radiation through the primary cooling water needs to be shielded and sealed with the closed portion. By welding to the outer periphery of the lower body so as to cover the cut portion, it is not necessary to process the welded portion of the lower body smoothly, and the operation for transportation can be simplified.

  The steam generator carrying method according to the sixth invention is characterized in that, in the fifth invention, when the lower body and the upper body are divided, they are cut by thermal cutting.

  According to this steam generator transportation method, thermal cutting can be performed at a high speed, so that workability for transportation can be improved.

  According to the present invention, the steam generator can be reasonably transported.

FIG. 1 is a schematic sectional side view of a steam generator. FIG. 2 is a process diagram illustrating a method of transporting a steam generator according to an embodiment of the present invention. FIG. 3 is a process diagram illustrating a method of transporting a steam generator according to an embodiment of the present invention. FIG. 4 is a process diagram illustrating a method of transporting a steam generator according to an embodiment of the present invention. FIG. 5 is a process diagram illustrating a method of transporting a steam generator according to an embodiment of the present invention. FIG. 6 is a process diagram illustrating a method of transporting a steam generator according to an embodiment of the present invention. FIG. 7 is a process diagram illustrating a method of transporting a steam generator according to an embodiment of the present invention. FIG. 8 is a process diagram illustrating a method of transporting a steam generator according to an embodiment of the present invention. FIG. 9 is a process diagram illustrating a method of transporting a steam generator according to an embodiment of the present invention. FIG. 10 is a process diagram illustrating a method of transporting a steam generator according to an embodiment of the present invention. FIG. 11 is a process diagram illustrating a method of transporting a steam generator according to an embodiment of the present invention. FIG. 12 is a process diagram illustrating a method for transporting a steam generator according to an embodiment of the present invention. FIG. 13 is a process diagram illustrating a method of transporting a steam generator according to an embodiment of the present invention.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a schematic sectional side view of a steam generator. The steam generator 1 as a heat exchanger is used, for example, in a pressurized water reactor (PWR). The pressurized water reactor uses light water as a reactor coolant and neutron moderator. The pressurized water reactor sends primary cooling water to the steam generator 1 as high-temperature and high-pressure water that does not boil light water over the entire core. In the steam generator 1, the heat of the primary cooling water at high temperature and high pressure is transmitted to the secondary cooling water, and water vapor is generated in the secondary cooling water. Then, the steam generator is rotated by this steam to generate electricity.

  The steam generator 1 has a trunk portion 2 that is elongated in the vertical direction and has a sealed hollow cylindrical shape. The lower part of the body 2 is slightly smaller in diameter than the upper half, and connects the lower body 2a forming the lower half, the upper body 2b forming the upper half, and the lower body 2a and the upper body 2b. It is composed of a substantially truncated cone-shaped cone cylinder 2c and an upper mirror 2d provided at the upper end of the upper cylinder 2b.

  The steam generator 1 is provided with a tube group outer cylinder 3 having a cylindrical shape disposed at a predetermined distance from an inner wall surface in a lower body 2a. The tube group outer cylinder 3 has a lower end portion extending to the vicinity of the tube plate 4 disposed at the lower end portion of the lower body 2a, and an upper end portion formed in a truncated cone shape at the position of the cone body 2c. It has a conical portion 3a. A heat transfer tube group 5A is provided in the tube group outer tube 3. The heat transfer tube group 5 </ b> A is composed of a plurality of heat transfer tubes 5 having an inverted U shape and elongated in the vertical direction. Each heat transfer tube 5 is formed in a U shape by an arc portion 5a and a straight portion 5b extending linearly from each end of the arc portion 5a. And the heat exchanger tube 5 is arrange | positioned facing the circular arc part 5a upwards, while the edge part of each linear part 5b is penetrated and fixed to the tube hole 4a of the tube sheet 4, and several places of the longitudinal direction in the linear part 5b Is supported by the tube group outer cylinder 3 via each tube support plate 6. The tube support plate 6 is formed with a large number of heat transfer tube insertion holes 6a, and the heat transfer tubes 5 are inserted into the heat transfer tube insertion holes 6a to support the heat transfer tubes 5. Further, in the heat transfer tube group 5A, in the U-shaped arc portion 5a of the heat transfer tube 5, in order to suppress fluid excitation vibration that may occur when the primary cooling water passes through the heat transfer tube 5, the bracing member 14 Is provided. The bracing member 14 is inserted while the arc portion 5a of the heat transfer tube 5 overlaps the side.

  The steam generator 1 is provided with a water chamber mirror 7 below the tube plate 4, and the interior of the water chamber mirror 7 is partitioned by a partition wall 8 into an inlet side water chamber 7A and an outlet side water chamber 7B. One end of each heat transfer tube 5 communicates with the inlet side water chamber 7A, and the other end of each heat transfer tube 5 communicates with the outlet side water chamber 7B. Further, the inlet-side water chamber 7A is formed with an inlet nozzle 7Aa that communicates with the outside of the trunk portion 2, and the outlet-side water chamber 7B is formed with an outlet nozzle 7Ba that communicates with the exterior of the trunk portion 2. The inlet nozzle 7Aa is connected to a cooling water pipe (not shown) through which primary cooling water is sent from the pressurized water reactor, and the outlet nozzle 7Ba sends the primary cooling water after heat exchange to the pressurized water reactor. The cooling water piping (not shown) to send is connected.

  The steam generator 1 includes an air / water separator 9 that separates feed water into steam and hot water inside the upper body 2b, and moisture that removes the moisture from the separated steam so that it is close to dry steam. A separator 10 is provided. Further, a water supply pipe 11 for supplying secondary cooling water from the outside into the lower body 2a is inserted between the steam separator 9 and the heat transfer tube group 5A at the lower part of the upper body 2b. . In addition, the steam generator 1 pipes the secondary cooling water supplied from the water supply pipe 11 into the lower body 2a between the lower body 2a and the tube group outer cylinder 3 in the lower body 2a. A water supply path 12 that is folded back by the plate 4 and is raised along the heat transfer tube group 5A is formed. Further, in the steam generator 1, a steam discharge port 13 is formed in the upper mirror 2d. The steam discharge port 13 is connected to a cooling water pipe (not shown) for sending steam to the turbine, and the water supply pipe 11 has two steams used in the turbine cooled by a condenser (not shown). A cooling water pipe (not shown) for supplying the next cooling water is connected.

  In the steam generator 1, the primary cooling water heated in the pressurized water reactor is sent to the inlet-side water chamber 7A, circulates through the numerous heat transfer tubes 5, and reaches the outlet-side water chamber 7B. On the other hand, the secondary cooling water cooled by the condenser is sent to the water supply pipe 11 and rises along the heat transfer pipe group 5 </ b> A through the water supply path 12 in the trunk portion 2. At this time, heat exchange is performed between the high-pressure and high-temperature primary cooling water and the secondary cooling water in the trunk portion 2. Then, the cooled primary cooling water is returned to the pressurized water reactor from the outlet side water chamber 7B. On the other hand, the secondary cooling water subjected to heat exchange with the high-pressure and high-temperature primary cooling water rises in the body portion 2 and is separated into steam and hot water by the steam separator 9. The separated steam is sent from the steam outlet 13 to the turbine after the moisture is removed by the moisture separator 10.

  As described above, in the steam generator 1, since the primary cooling water from the nuclear reactor passes through the heat transfer tube 5, the heat transfer tube 5 is exposed to radiation and includes radioactivity. Therefore, generally, the steam generator 1 removed from the nuclear reactor is stored as a radioactive waste in a storage in the nuclear power generation facility for a certain period.

  2-13 is process drawing which shows the conveyance method of the steam generator which concerns on this embodiment. As shown in FIG. 2, the steam generator 1 is stored on the floor 101 in the storage 100 in a state in which the steam generator 1 is placed horizontally by the support frame 102. In the present embodiment, in the steam generator 1 placed horizontally, the left-right direction described above is indicated by a symbol W called a width direction, and the longitudinal direction corresponding to the vertical direction in use is called an axial direction by a symbol L. The vertical direction is indicated by the symbol H.

  The support frame 102 is disposed at a position on the lower end side (near the tube plate 4) of the lower body 2a and a position on the upper end side (near the upper mirror 2d) of the upper body 2b. As shown in FIGS. 2 and 3, the support frame 102 is in contact with a part of the outer periphery of the body 2 of the steam generator 1 placed horizontally and extends in the width direction W. 102a and support portions 102b disposed at both ends in the width direction W below the gantry portion 102a. Further, as shown in FIG. 3, the support base 102 is provided with a jack 102c between the base part 102a and the support part 102b.

  When transporting the steam generator 1, first, the entire steam generator 1 placed horizontally on the floor 101 of the storage 100 is covered with the green house 103. The green house 103 is shown only in FIGS. 2 and 3 and is omitted in the subsequent drawings.

  Next, as shown in FIG. 4, the support frame 102 is additionally arranged at a position on the upper end side (near the conical cylinder 2 c) of the lower body 2 a and a position on the lower end side (near the conical cylinder 2 c) of the upper body 2 b. Thereafter, the lower body 2a and the upper body 2b are cut and divided. In this case, cutting is performed by moving a cutting device (not shown) along the circumference of the circle of the body 2. A cutting device arrange | positions track | orbits, such as a rail and a band, along the periphery of the circle | round | yen of the trunk | drum 2, and makes a cutting machine 1 round along this track | orbit. Some cutting machines have a cutting blade (such as a grindstone blade or a diamond blade) that performs mechanical cutting, and others have a head that performs thermal cutting (such as gas cutting, laser cutting, or plasma cutting). As the thermal cutting, gas cutting is effective and preferable for cutting the thick body 2 where it is difficult to supply energy because the energy is not supplied from the outside but by combustion of the material to be cut. . Moreover, the cutting | disconnection which operates a cutting machine manually other than the automatic cutting apparatus which moves a cutting machine along a track | orbit may be sufficient.

  The cutting position between the lower body 2a and the upper body 2b is preferably the boundary between the lower body 2a and the conical body 2c. When cutting between the lower body 2a and the conical cylinder 2c, the conical part 3a of the tube group outer cylinder 3 in the body 2 is also cut. Similarly to the cutting of the body 2, the cutting of the cone 3 a is performed by moving a cutting device (not shown) along the circumference of the circle of the body 2. In this way, the cutting device is moved along the circumference of the circle of the body portion 2 to perform the cutting, whereby the body portion 2 and the tube group outer tube 3 are respectively cut, and the heat transfer tube group 5A is left as it is. 2a side (see FIG. 7). Thereby, the lower body 2a and the upper body 2b are divided.

  Next, as shown in FIGS. 5 and 6, the transport vehicle 104 is disposed below the upper trunk 2b, and the upper trunk 2b is separated from the lower trunk 2a side by the transport vehicle 104 as shown in FIG. As shown in FIG. 6, the transport vehicle 104 includes a jack 104 a and is disposed between the support portions 102 b on both sides in the width direction W and below the gantry portion 102 a. At this time, the transport vehicle 104 in which the upper surface of the jack 104a is positioned higher than the support portion 102b is arranged in a state where the upper trunk 2b is raised upward in the vertical direction H together with the gantry portion 102a by the jack 102c of the support gantry 102. Thereafter, the upper trunk 2b is lowered downward in the vertical direction H together with the gantry 102a by the jack 102c, and the gantry 102a is placed on the upper surface of the jack 104a of the transport vehicle 104. Thereby, the upper trunk | drum 2b is moved to the transport vehicle 104 from the support part 102b, and the upper trunk | drum 2b is separated from the lower trunk | drum 2a side by moving the transport vehicle 104 to the left side in the figure of the longitudinal direction L.

  Next, the cut portion of the upper body 2b separated from the lower body 2a side is closed. Specifically, as shown in FIG. 7, a closing portion 105 such as a steel plate that closes the opening of the cutting portion is welded. In this way, with the conical cylinder 2c and the upper mirror 2d in a state where the cut portion of the upper cylinder 2b is closed, the conical part 3a of the tube group outer tube 3, the steam-water separator 9 and the moisture separator are contained therein. 10 is transported to a predetermined dismantling place by the transport vehicle 104. The upper body 2b is dismantled at a dismantling place and accommodated in a storage container (not shown).

  Next, since the primary cooling water has passed through the heat transfer tube 5 on the lower barrel 2a side, the cut portion of the lower barrel 2a is shielded and sealed as shown in FIGS. For shielding and sealing the lower body 2a, the transport vehicle 104 carries and welds a closing portion 106 such as a steel plate that closes the opening of the cut portion. The closing part 106 is formed so as to cover the arc part 5a of the heat transfer tube 5 protruding from the cut part of the lower body 2a. Here, when the cut portion of the lower body 2a is cut by mechanical cutting, the cut surface is almost smooth. Therefore, as shown in FIG. 9 and FIG. It is welded against the cut surface of the cut portion. For this reason, as shown in FIG. 10, the closing part 106 has a groove 106a formed on its end face. On the other hand, when the cut portion of the lower body 2a is cut by thermal cutting, the cut surface melts and is not smooth, so the closing portion 106 is formed to cover the cut portion as shown in FIG. And welded to the outer periphery of the lower body 2a.

  Finally, as shown in FIGS. 12 and 13, a transport vehicle 104 is arranged below the lower trunk 2 a, and the transport vehicle 104 is accompanied by a tube sheet 4 and a water chamber mirror 7, and a tube group inside thereof. The lower shell 2a having the outer cylinder 3, the heat transfer tube group 5A, and the tube support plate 6 is transported to a predetermined dismantling place. The lower trunk 2a is transferred from the support frame 102 to the transport vehicle 104 in the same manner as described above.

  By the way, in embodiment mentioned above, in the division | segmentation with the lower trunk | drum 2a and the upper trunk | drum 2b, between the lower trunk | drum 2a and the cone cylinder 2c is cut | disconnected. This is because the upper body 2b has a larger outer shape than the lower body 2a, so that when the entrance of a predetermined dismantling place is narrow, the lower body 2a side having a small outer shape can be brought together into the dismantling place. Because. In this case, it is necessary to cut the conical portion 3a of the tube group outer tube 3. However, if there is a steam generator 1 that is difficult to access to separate the conical portion 3a of the tube group outer tube 3 from the lower body 2a even if the lower body 2a and the conical body 2c are cut, By cutting also between the body 2b and the cone body 2c, the lower body 2a, the upper body 2b and the cone body 2c are divided into three parts and transported.

  Thus, in the steam generator carrying method of the present embodiment, a large number of heat transfer tubes 5 formed in an inverted U shape on the lower body 2 a side of the tubular body 2 are surrounded by the tube group outer tube 3. In the method of transporting the steam generator 1 in which the steam / water separator 9 and the moisture separator 10 are further provided on the upper body 2b side of the body 2, the steam generator 1 is placed horizontally. In this state, the lower body 2a and the upper body 2b are cut and divided along the circumference of the body portion 2, and then the cut portion of the lower body 2a is shielded and sealed, and the upper body 2b. And a step of transporting the lower body 2a side and the upper body 2b side to a predetermined dismantling place by the transport vehicle 104, respectively.

  According to this steam generator transporting method, the steam generator 1 is divided into the lower body 2a side and the upper body 2b side, so that the entrance of the dismantling place is narrow or the vicinity of the entrance of the dismantling place is narrow and the steam generator When 1 cannot be managed, it becomes possible to carry the steam generator 1 and carry it into a dismantling place. In particular, in the steam generator transport method of the present embodiment, the lower body 2a and the upper body 2b are cut and divided along the circumference of the body 2. For this reason, since the lower trunk | drum 2a and the upper trunk | drum 2b can be divided | segmented so that the heat exchanger tube 5 currently supported in the lower trunk | drum 2a may not be cut | disconnected, the heat exchanger tube 5 which the primary cooling water passed and was contaminated with the radiation It is possible to transport to a dismantling place in a safe state by keeping the state as it is without cutting and shielding and sealing the cut part of the lower body 2a.

  In the steam generator transport method of the present embodiment, the steam generator 1 has an upper cylinder 2b having a larger outer shape than the lower cylinder 2a, and a conical cone cylinder between the lower cylinder 2a and the upper cylinder 2b. 2c is provided, and when the lower body 2a and the upper body 2b are divided, it is preferable to cut between the lower body 2a and the conical body 2c.

  According to this steam generator transporting method, the lower barrel 2a and the conical barrel 2c are cut to divide the steam generator 1 into the lower barrel 2a side and the upper barrel 2b side. Since the outer shape is small, when the entrance of the dismantling place is narrow, it can be easily carried into the dismantling place.

  In the steam generator carrying method of the present embodiment, it is preferable that the closing portion 106 that shields and seals the cut portion of the lower body 2a is butted against the cut surface of the cut portion and welded.

  According to this method of transporting the steam generator, the lower body 2a having the heat transfer tube 5 that has been contaminated with radiation through the primary cooling water needs to be shielded and sealed by the closing portion 106. Since the closing portion 106 is butted against the cut surface of the cutting portion and welded, it can be transported without enlarging the outer shape of the lower body 2a, and can be easily carried into a dismantling place.

  Moreover, when the steam generator carrying method of this embodiment divides | segments the lower trunk | drum 2a and the upper trunk | drum 2b, it is preferable to cut | disconnect by mechanical cutting.

  According to this steam generator carrying method, the cut surface of the cut portion of the lower trunk 2a is substantially smoothed by mechanical cutting, so that the closing portion 106 can be brought into contact with the cut surface of the cut portion to facilitate welding. Become.

  In the steam generator carrying method of the present embodiment, the closing portion 106 that shields and seals the cut portion of the lower body 2a is formed so as to cover the cut portion and is welded to the outer periphery of the lower body 2a. preferable.

  According to this method of transporting the steam generator, the lower body 2a having the heat transfer tube 5 that has been contaminated with radiation through the primary cooling water needs to be shielded and sealed by the closing portion 106. By welding to the outer periphery of the lower shell 2a so as to cover the cutting portion with the closing portion 106, the work for smoothing the welded portion of the lower shell 2a is not required, and the work for transportation is simplified. It becomes possible.

  Moreover, when the steam generator conveyance method of this embodiment divides | segments the lower trunk | drum 2a and the upper trunk | drum 2b, it is preferable to cut | disconnect by thermal cutting.

  According to this steam generator transportation method, thermal cutting can be performed at a high speed, so that workability for transportation can be improved.

DESCRIPTION OF SYMBOLS 1 Steam generator 2 Body 2a Lower body 2b Upper body 2c Conical body 2d Upper mirror 3 Tube group outer cylinder 3a Conical part 5 Heat transfer tube 5a Arc part 5b Straight part 5A Heat transfer tube group 104 Transport vehicle 105 Closure part 106 Closure part

Claims (5)

A large number of heat transfer tubes formed in an inverted U shape on the lower body side of the cylindrical body are supported in a state surrounded by the outer tube of the tube group, and further, an air / water separator is provided on the upper body side of the body. And a method of transporting a steam generator provided with a moisture separator,
In the state where the steam generator is placed horizontally, the step of cutting and dividing between the lower body and the upper body along the circumference of the body part;
Next, the step of shielding and sealing the cut portion of the lower body and closing the cut portion of the upper body,
Next, each of the lower trunk side and the upper trunk side is transported to a predetermined dismantling place by a transport vehicle,
Only including,
In the steam generator, the upper body is formed to have an outer shape larger than the lower body, a conical conical cylinder is provided between the lower body and the upper body, and the lower body and the upper body The steam generator transporting method is characterized by cutting between the lower body and the conical body . Steam generator carrying method according to claim 1, characterized in that the closure for blocking and sealing the cut portion of the lower cylinder, welded against the cut surface of the cut portion. The steam generator carrying method according to claim 2 , wherein when the lower body and the upper body are divided, the lower body and the upper body are cut by mechanical cutting. The closure for blocking and sealing the cut portion of the lower cylinder, the steam generator transportation according to claim 1 which is formed so as to cover the cutting unit, characterized in that welded to the outer periphery of the lower cylinder Method. The steam generator carrying method according to claim 4 , wherein when the lower body and the upper body are divided, the lower body and the upper body are cut by thermal cutting.

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