The device that is used for the assembling of fast reactor neutron source
Technical field
The invention belongs to the nuclear reactor art field, be specifically related to a kind of device that is used for the assembling of fast reactor neutron source.
Background technology
Fast breeder is called for short fast reactor, it is a kind of heap type that causes chain reaction of nuclear fission by fast neutron, its advantage be can be difficult to utilize in the thermal reactor and abundance be that U-238 more than 99.2% is converted into the nuclear fuel Pu-239 that can utilize, can greatly improve the utilization factor of nuclear fuel.
The assembling of neutron source comprises the shielding transportation and installation of neutron source, and the shielding of neutron source is adopted and contained shielding materials such as boron polyethylene, lead.The installation in pile neutron source generally imports in the reactor through shielding.The neutron source box of fast reactor needs safe transport to arrive the fast reactor reactor hall after isotope hot cell worktable is assembled into the single rod of neutron source, and with it in the charging passage is packed the neutron source housing into.In this course, need to realize the butt joint of interface and shielding to neutron source.
Summary of the invention
(1) goal of the invention
The object of the invention is finished the assembling of neutron source assembly for realizing with the single rod of the neutron source neutron source housing of packing under the situation of the good shielding to neutron source.
(2) technical scheme
For achieving the above object, the invention provides following technical scheme:
A kind of device that is used for the assembling of fast reactor neutron source comprises cask flask, carriage, gripping mechanism and shield, and key is:
Described cask flask comprises cylindrical shell, tubule, lead, stopper etc., and cylindrical shell is upper, middle and lower three cylindrical section shape welded structures, and the stage casing is the thickest the longest, and hypomere is the thinnest the shortest, and cylindrical shell epimere side is provided with handle, and on the handle being has rope to be used for fixing the single rod of neutron source.Tubule is positioned in the middle of the cylindrical shell, is fixed with lead on the tubule, and lead is positioned at the center of cylindrical shell.The single rod of neutron source places in the tubule, and the neutron source of its lower end places in the lead.The tubule below is plugged with stopper, and the stopper bottom is for filling the stainless steel bar of boracic paraffin, and top is elongated tygon rod.There is the rod iron that can insert and extract the stopper below.
Described carriage is a welded structure, comprises channel-section steel and welding arc plate thereon, and the size of arc plate and spacing and cask flask size adapt.
Described gripping mechanism is connected by screw-nut by two clamping blocks.Described shield is the cylindric welded structures of two sections, and the thick hypomere of epimere is thin, and the tube at shield center can make the bottom of gripping mechanism embed wherein just.
Described cylindrical shell is made by carbon steel sheet, and its inner boracic paraffin of filling is respectively equipped with hanger on cylindrical shell upper end and the side.The cylindrical shell top is equipped with top cover, and top cover is fixed on the cylindrical shell by housing screw.
Described tubule is made by stainless steel, and tubule is filled with tygon below neutron source.
The described lead outside coats layer of polyethylene.
Cover rubber slab on the arc plate of described carriage.Described carriage is provided with suspension ring, baffle plate and housing screw.
(3) beneficial effect
Technical scheme provided by the invention can be safely, the neutron source housing of easily the single rod of neutron source being packed into, finishes the assembling of neutron source assembly.
Description of drawings
Fig. 1 is the cask flask structural representation, and wherein 1 is cylindrical shell, and 2 is tubule, and 3 is the single rod of neutron source, and 4 is lead, and 5 is boracic paraffin, and 6 is stopper, and 7 for being rod iron, and 8 is housing screw, and 9 is top cover, and 10 is handle, and 11 is hanger;
Fig. 2 is the structural representation of carriage, and wherein 12 is channel-section steel, and 13 is the arc plate, and 14 is suspension ring;
Fig. 3 places synoptic diagram on the carriage for cask flask, and wherein 12 is channel-section steel, and 13 is the arc plate, and 14 is suspension ring, and 21 is baffle plate, and 22 is housing screw;
Fig. 4 is the neutron source assembly drawing, and 16 is cask flask, and 17 is gripping mechanism, and 18 is shield, and 19 is the neutron source assembly, and 20 is the changeover bobbin charging passage of fast reactor;
Fig. 5 is a gripping mechanism, and wherein 15 is clamping block.
Embodiment
The present invention is described further below in conjunction with specific embodiment.
Present embodiment discloses a kind of device that is used for the assembling of fast reactor neutron source, comprises cask flask 16, carriage, gripping mechanism 17 and shield 18.Cask flask 16 is fixed on is transported to the fast reactor reactor hall on the carriage, place on the shield 18 then,, realize the single rod 3 of the neutron source neutron source housing of packing into by gripping mechanism 17 location.Below specify.
The effect of described cask flask is: a, dock with isotope hot cell worktable, and will packing at the single rod of the neutron source of isotope hot cell worktable assembling, cask flask shields and transportation; The butt joint of b and fast reactor charging passage is packed neutron source in the neutron source housing into.Cask flask comprises cylindrical shell 1, tubule 2, lead 4, stopper 6 etc., and cylindrical shell 1 is upper, middle and lower three cylindrical section shape welded structures, and the stage casing is the thickest the longest, and hypomere is the thinnest the shortest.Cylindrical shell 1 epimere side is provided with handle 10, and on the handle 10 being has rope to be used for fixing the single rod 3 of neutron source.Be respectively equipped with hanger 11 on cylindrical shell 1 upper end and the side, be used for lifting.Cylindrical shell 1 is made by carbon steel sheet, and its inner boracic paraffin 5 of filling plays the effect of shielding neutron source.Cylindrical shell 1 top is equipped with top cover 9, and top cover 9 usefulness housing screws 8 are fixed on the cylindrical shell 1.
Tubule 2 is positioned in the middle of the cylindrical shell 1, is used to hold the single rod 3 of neutron source and to the shielding of neutron.Be fixed with lead 4 on the tubule 2, lead 4 is positioned at the center of cylindrical shell 1; The single rod 3 of neutron source places in the tubule 2, and the neutron source of its lower end places in the lead 4 just; Tubule 2 is made by stainless steel, and tubule 2 is filled with tygon below neutron source, and lead 4 outsides coat layer of polyethylene.The lead 4 of parcel neutron source makes moderation of neutrons, utilizes the paraffin that contains boron carbide that slow neutron is slowed down then and is thermal neutron, finally is carbonized boron and absorbs.
Tubule 2 belows are plugged with stopper 6, prevent that the single rod 3 of neutron source from dropping.Stopper 6 tops are elongated tygon rod, and its diameter is slightly less than the internal diameter of tubule 2; Stopper 6 bottoms are used to shield the radioactivity of neutron source for filling the stainless steel bar of boracic paraffin.There is the rod iron 7 that can insert and extract stopper 6 belows, and are used for fixing stopper.
Described carriage is a welded structure, comprise channel-section steel 12 and welding thereon with cask flask 16 big or small corresponding arc plates 13.With housing screw cask flask is pressed abd fixed on the channel-section steel 12 of carriage, the weight of cask flask is pressed on the arc plate 13.Cover rubber slab on the arc plate of carriage, be used for cushioning the impact of transportation, improve stationarity.Carriage is provided with suspension ring 14, is used for the lifting of carriage and cask flask.
Described gripping mechanism 17 is connected by screw-nut by two clamping blocks 15.
Described shield is the cylindric welded structures of two sections, and the thick hypomere of epimere is thin, and the tube at shield center can make the bottom of gripping mechanism 17 embed wherein just.Shield 18 is a polythene material, in the changeover bobbin charging passage 20 of the fast reactor of packing into, for neutron source assembly that the single rod of neutron source is packed into provides support.
Fig. 4 is seen in the neutron source assembling.With pack into the changeover bobbin charging passage 20 of fast reactor of shield 18; Gripping mechanism 17 bottoms are embedded in the shield; The bottom aligning gripping mechanism 17 of cask flask 18 is put into and tightened by gripping mechanism 17; Slowly put down the nylon rope that is fixed on the handle 10 the single rod 3 of neutron source is put into the housing of neutron source assembly 19, promptly finish the assembling of neutron source assembly.
Above content be in conjunction with preferred embodiment to specifying that the present invention did, can not assert that the specific embodiment of the present invention only limits to these explanations.Concerning the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deductions and conversion, all should be considered as belonging to protection scope of the present invention.