Heavy-water spent fuel dry type storage screen transportation container
Technical field
The invention belongs to heavy water reactor spentnuclear fuel dry storage technical field, be specifically related to a kind of heavy-water spent fuel dry type storage screen transportation container.
Background technology
Along with the operation of heavy water reactor, can produce a large amount of spentnuclear fuels.The spentnuclear fuel that heavy water reactor produces leaves in after discharging in the spentnuclear fuel pond.Yet the spentnuclear fuel pond can be filled eventually, therefore must solve the problem of outlet of spentnuclear fuel, otherwise can badly influence the normal operation of nuclear power plant.
At present, the way that solves in the world the spentnuclear fuel outlet is to adopt the method for heavy water reactor spentnuclear fuel interim dry storage in nuclear power plant, namely builds dry storage module for heavy water reactor irradiated fuel.This reservoir module outside is the reinforced concrete structure of rectangle, is provided with 40 storage tubes in each module, arranges by 4 row, 10 row, and each storage tube can be deposited 10 spentnuclear fuel baskets, and each spentnuclear fuel basket is equipped with 60 spentnuclear fuel clusters.At the In transit of spentnuclear fuel basket from the shielding work box to the module storage area, shielded coffin is used for providing the shielding to the spentnuclear fuel basket.
Mainly there is following shortcoming in existing shielded coffin: the less stable of (1) translation door driving mechanism; (2) centering of gripping apparatus head is relatively poor; (3) the equipment Operation safety is relatively poor; (4) the equipment reliability of operation is relatively poor.
Summary of the invention
The object of the present invention is to provide a kind of heavy-water spent fuel dry type storage screen transportation container, to satisfy under the prerequisite of its function of shielding guaranteeing, overcome the above-mentioned shortcoming that existing equipment exists.
For achieving the above object, the technical solution used in the present invention is as follows: a kind of heavy-water spent fuel dry type storage screen transportation container, this device comprise shielding cylinder, hang yoke assembly, Electric Chain Blocks, translation door driving mechanism and translation door; The described yoke assembly that hangs is connected to form by the upper end of the crossbeam of the level joint pin vertical with two that are positioned at the crossbeam two ends, and the lower end of two joint pins connects with the relative both sides of shielding cylinder respectively; Electric Chain Blocks is installed in the lower end, middle part of crossbeam, and its loop chain is connected with an end of gripping apparatus head adapter, and the other end of gripping apparatus head adapter is connected with the gripping apparatus head, and gripping apparatus head adapter and gripping apparatus head are positioned at shielding cylinder; One side of shielding cylinder bottom has the translation gate slot of rectangle, the left and right sides of translation gate slot is equipped with track, in the outside of shielding cylinder the track extended structure is arranged, article two, track is from the shielding cylinder laid inside to the track extended structure, translation door is installed between two tracks, the translation door driving mechanism is installed in the rear end of track extended structure, and translation door can move between two tracks under its effect, and can enter in the translation gate slot of shielding cylinder.
The lower end of described shielding cylinder is foursquare base, on connect a columniform cylindrical shell, its integral body by inside and outside two-layered steel plates and in the middle of fill with lead and consist of, its inner formation can be held the cylindrical cavity of a spentnuclear fuel basket; The neutron shield plate of Boron-containing-PE is housed at the outside surface of shielding cylinder; Be provided with flat columniform top cover in the upper end of cylindrical shell, have through hole on the top cover, the loop chain on the gripping apparatus head adapter top that is connected with the gripping apparatus head extend in the shielding cylinder by this through hole; At top cover approach switch A is installed, as the signaling switch that puts in place of spentnuclear fuel basket; Frizzen is installed in top cover, to cooperate with the gripping apparatus head adapter, realizes the cable of this shielded coffin and the limit function of tracheae; Be separately installed with two vertical relative yoke web joints that hang in the relative both sides of cylindrical shell, the lower end of hanging two joint pins of yoke assembly is connected to two vertical relative hanging between the yoke web joint of the relative both sides of cylindrical shell; Be evenly equipped with several shackles at cylindrical shell; On cylindrical shell, also be provided with some angle steel.
Have the translation gate slot of rectangle in a side of described base; On base, and the top that is positioned at the translation gate slot is equipped with approach switch B, the signaling switch that puts in place of closing as translation door; On base, and a side that is positioned at the translation gate slot is equipped with the translation door lock, is used for being locked when translation door opens or closes.
The bottom of described gripping apparatus head adapter is cylindrical, and columniform top is disk, and disk diameter has three vertical through holes greater than columniform diameter on the disk, passes for two tracheaes and a cable; One end of gripping apparatus head adapter disk is connected with the loop chain of Electric Chain Blocks, and a columniform end is connected with the gripping apparatus head; When gripping apparatus head adapter and gripping apparatus head move upward, trigger the frizzen of installing in the top cover of shielding cylinder, frizzen is by jack-up, the approach switch A that is installed on the top cover of shielding cylinder is triggered, Electric Chain Blocks stops action, thereby realizes the cable of this shielded coffin and the limit function of tracheae.
The described crossbeam that hangs yoke assembly is to be connected to form by bearing pin by two blocks of vertical steel plates, middle part at crossbeam two block plates is welded with respectively two block plates, the lifting pin is through between two block plates, top at the lifting pin is provided with a hand-rail type leading screw driving mechanism, by this driving mechanism, can move the position of lifting pin, so that the suspension hook of crane puts down and centering, and then pass through this driving mechanism so that lifting pin homing; There are being two center of gravity regulating blocks to be bolted on respectively on two block plates between two block plates, and between center of gravity regulating block and steel plate, be provided with the adjustment pad, equipment is used for the position of center of gravity regulating block is adjusted, so that during the lifting of the suspension hook of crane, can keep balance.
At a described end that hangs the crossbeam of yoke assembly, and tracheae angle sheave I is installed between its two block plate; At the other end of crossbeam, and cable angle sheave I is installed between its two block plate; Two joint pin inside have rectangular channel along axis, upper end at the joint pin that tracheae angle sheave I one side is installed is equipped with tracheae fixed pulley group, the tracheae running block is installed in the rectangular channel of this joint pin inside, and the middle part installed inside of this joint pin outside surface has tracheae angle sheave II; Upper end at the joint pin that cable angle sheave I one side is installed is equipped with cable fixed pulley group, the cable running block is installed in the rectangular channel of this joint pin inside, the middle part installed inside of this joint pin outside surface has cable angle sheave II, and in a side relative with cable angle sheave II electric control box is installed, the various cables that the shielded coffin operation is required and the interface of tracheae, power supply and source of the gas and shielded coffin all are installed in the electric control box.
The arrangement of described tracheae and cable is as follows: two tracheaes are drawn from electric control box, pass through successively tracheae running block, tracheae fixed pulley group, tracheae angle sheave I and tracheae angle sheave II, pass from the gripping apparatus head adapter again; A cable is drawn from electric control box, passes through successively cable running block, cable fixed pulley group, cable angle sheave I and cable angle sheave II, passes from the gripping apparatus head adapter again; After two tracheaes and a cable pass from the gripping apparatus head adapter, all be connected with the gripping apparatus head.
Be equipped with at described Electric Chain Blocks and highly indicate control module, highly indicate control module to comprise flip flop equipment and Displaying Meter, wherein flip flop equipment is installed on the Electric Chain Blocks, be used for gathering the altitude signal of spentnuclear fuel basket, Displaying Meter is installed in the electric control box, is used for showing the height of spentnuclear fuel basket; Load transducer and overweight protection control module also are installed above Electric Chain Blocks; load transducer gathers the weight signal of spentnuclear fuel basket lifting process; overweight protection control module obtains to judge behind this weight signal; if weight signal is unusual, then controls Electric Chain Blocks and stop action.
Described translation door is that outer steel intralamellar part filling lead is made, and its left and right sides is equipped with rail wheel; Described translation door driving mechanism comprises motor, bearing and leading screw, and bearing is installed in the rear end of track extended structure, and motor is installed on the bearing, and driven by motor guide screw movement, leading screw drive the translation door motion; Rear end at the track extended structure also is equipped with approach switch C, the signal that puts in place of opening as translation door.
Be provided with the crane span structure of steel above described track extended structure, the main body of crane span structure is comprised of a platform and the guardrail that two rows that are positioned at the platform top be arranged in parallel; One end of platform is connected on the shielding cylinder, between two row's guardrails protective door is installed; Be respectively arranged with People's Bank of China's ladder in the both sides of platform lower end; Crane span structure is connected support with the angle steel of shielding cylinder; Also be provided with some connecting links on the track extended structure, its other end and shielding cylinder are bolted.
The obtained beneficial effect of the present invention is as follows: this heavy-water spent fuel dry type storage screen transportation container is being guaranteed to satisfy under the prerequisite of its function of shielding, simplified design proposal, manufacture difficulty and manufacturing cost have been reduced, reduce the suffered radiation dose of operating personnel, improved simultaneously stability, reliability and the security of equipment operation.Specifically comprise following several aspect:
(1) for the shortcoming of the translation door driving mechanism less stable of former shielded coffin, this shielded coffin has been done following improvement:
The translation door driving mechanism of this shielded coffin all has supporting at two ends, effectively guarantee the stability of equipment operation, simplified simultaneously the design of its internal mechanism, so that compact conformation is effective, reduce difficulty and the cost made, improved equipment Operation safety and reliability;
(2) for the relatively poor shortcoming of gripping apparatus head centering of former shielded coffin, this shielded coffin has been done following improvement:
The mechanism that this shielded coffin adopts fixed pulley group and running block to cooperate, it is constant force to the power that cable and tracheae apply, can not change because of the length that cable and tracheae are emitted, the Tensity size that while cable and tracheae are subject to is adjusted balance by counterweight, thereby greatly improved the accuracy of alignment of gripping apparatus head, guaranteed that shielded coffin can return in the storage tube to get the spentnuclear fuel basket; Simultaneously, because the displacement of running block concerns with the multiple that the displacement of gripping apparatus head becomes to fix, this mechanism has the function that mechanical type gripping apparatus grease head highness is indicated concurrently, for operating personnel provide reliable operating basis, has improved the equipment Operation safety;
The gripping apparatus head adapter of this shielded coffin has increased the limit function to tracheae and cable, so that the cable between gripping apparatus head adapter and the gripping apparatus head and tracheae keep relaxed state, thereby guarantee that the gripping apparatus head is not subjected to the External Force Acting of cable and tracheae, only under Action of Gravity Field, keep plumbness, guarantee the centering of gripping apparatus head, improved the reliability of equipment; And the gripping apparatus head adapter has the function of spentnuclear fuel basket upper limit position switch trigger concurrently, then can avoid the rush to summit generation of accident of spentnuclear fuel basket;
(3) for the relatively poor shortcoming of the equipment safety in operation of former shielded coffin, this shielded coffin has been done following improvement:
The yoke assembly that hangs of this shielded coffin adopt to be adjusted the position of pad counterweight heart regulating block and is adjusted, so that during the lifting of the suspension hook of crane, equipment can keep balance; Simultaneously increased a hand-rail type leading screw driving mechanism at the lifting pin top of hanging yoke assembly, by this driving mechanism, the position of mobile lifting pin, so that suspension hook puts down and centering, and then pass through this driving mechanism so that lifting pin homing, improve the security in the suspension hook installation process, alleviated operating personnel's labour intensity, reduced simultaneously the suffered radiation dose of operating personnel;
This shielded coffin has increased the height indication control module in the spentnuclear fuel basket lifting process, can judge by this control module the run location of spentnuclear fuel basket, to operate; The risk that this control module has avoided former shielded coffin to exist has improved equipment reliability of operation and security largely;
This shielded coffin has increased overweight protection control module, and it cooperates jointly with load transducer, in case the generation of the spentnuclear fuel basket fallen accident that stop ring chain electric block overload causes has improved the equipment Operation safety;
(4) for the relatively poor shortcoming of the equipment operational reliability of former shielded coffin, this shielded coffin has been done following improvement:
The translation door limit switch of this shielded coffin adopts the induction type approach switch, and its precision and reliability improve a lot, and have simplified design when having improved the equipment reliability of operation, have reduced manufacturing cost;
(5) this shielded coffin has been made simplified design to the neutron barricade on the basis of satisfying the radiation shield requirement, has reduced manufacturing cost.
Description of drawings
Fig. 1 is heavy-water spent fuel dry type storage screen transportation container structural drawing of the present invention;
Fig. 2 is the shielding cylinder structural drawing of heavy-water spent fuel dry type storage screen transportation container of the present invention;
Fig. 3 be heavy-water spent fuel dry type storage screen transportation container of the present invention hang the yoke assembly structural drawing;
Fig. 4 is translation door and the translation door driving mechanism structure figure of heavy-water spent fuel dry type storage screen transportation container of the present invention;
Fig. 5 is the portal structure figure of heavy-water spent fuel dry type storage screen transportation container of the present invention.
Among the figure: 1, shielding cylinder; 2, hang yoke assembly; 3, Electric Chain Blocks; 4, crane span structure; 5, translation door driving mechanism; 6, translation door; 11, approach switch A; 12, top cover; 13, neutron shield plate; 14, cylindrical shell; 15, approach switch B; 16, hang the yoke web joint; 17, translation door lock; 18, base; 19, angle steel; 110, translation gate slot; 111, shackle; 21, tracheae angle sheave I; 22, tracheae fixed pulley group; 23, tracheae running block; 24, tracheae angle sheave II; 25, gripping apparatus head adapter; 26, hand-rail type leading screw driving mechanism; 27, cable angle sheave I; 28, cable fixed pulley group; 29, load transducer; 210, electric control box; 211, highly indicate control module; 212, cable angle sheave II; 213, crossbeam; 214, joint pin; 215, overweight protection control module; 216, steel plate; 31, rail wheel; 32, track; 33, motor; 34, bearing; 35, approach switch C; 36, track extended structure; 41, platform; 42, guardrail; 43, protective door; 44, People's Bank of China's ladder; 45, connecting link.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in detail.
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, heavy-water spent fuel dry type storage screen transportation container of the present invention comprise shielding cylinder 1, hang yoke assembly 2, Electric Chain Blocks 3, crane span structure 4, translation door driving mechanism 5 and translation door 6; The described yoke assembly 2 that hangs is connected to form by the crossbeam 213 of the level upper end by the bearing pin joint pin 214 vertical with two that are positioned at the crossbeam two ends, and the lower end of two joint pins 214 connects with the relative both sides of shielding cylinder 1 respectively; Electric Chain Blocks 3 is installed in the lower end, middle part of the crossbeam 213 that hangs yoke assembly 2; One side of shielding cylinder 1 bottom has the translation gate slot 110 of rectangle, the left and right sides of translation gate slot 110 is equipped with track 32, in the outside of shielding cylinder 1 track extended structure 36 is arranged, article two, track 32 is from shielding cylinder 1 laid inside to track extended structure 36, translation door 6 is installed between two tracks, translation door driving mechanism 5 is installed in the rear end of track extended structure 36, and translation door 6 can move between two tracks under its effect, and can enter in the translation gate slot 1 10 of shielding cylinder 1; Above track extended structure 36, be provided with crane span structure 4.
As shown in Figure 2, the lower end of described shielding cylinder 1 is foursquare base 18, on connect a columniform cylindrical shell 14, its integral body by inside and outside two-layered steel plates and in the middle of fill with lead and consist of, its inner formation can be held the cylindrical cavity of a spentnuclear fuel basket; The outside surface of shielding cylinder 1 is equipped with the neutron shield plate 13 of Boron-containing-PE, so that neutron shield to be provided; The upper end of cylindrical shell 14 is provided with flat columniform top cover 12, and its interior shape and gripping apparatus head are complementary, and have through hole on the top cover 12, and the loop chain on gripping apparatus head adapter 25 tops that are connected with the gripping apparatus head extend into the inside of shielding cylinder 1 by this through hole; In top cover 12, frizzen is installed, to cooperate with gripping apparatus head adapter 25, realizes the limit function to cable and tracheae; Approach switch A11 also is installed, as the signaling switch that puts in place of spentnuclear fuel basket on top cover 12; Be evenly equipped with several shackles 111 at cylindrical shell 14, be used in transportation this shielded coffin being fixed on trailer; On cylindrical shell 14, also be provided with some angle steel 19, realize the support to crane span structure 4; Be separately installed with two vertical relative yoke web joints 16 that hang in the relative both sides of cylindrical shell 14, the lower end of hanging two joint pins 214 of yoke assembly 2 is connected to two vertical relative hanging between the yoke web joint 16 of the relative both sides of cylindrical shell 14; Have the translation gate slot 110 of rectangle in a side of base 18, the left and right sides of translation gate slot 110 is equipped with track 32, and on base 18, and the top that is positioned at translation gate slot 110 is equipped with approach switch B15, the signaling switch that puts in place of closing as translation door 6; On base 18, and a side that is positioned at translation gate slot 110 is equipped with translation door lock 17, is used for entering in the translation gate slot 1 10 when translation door 6, and namely translation door 6 is closed or left translation gate slot 1 10 when translation door 6, is locked when namely translation door 6 is opened.
As shown in Figure 3, the described yoke assembly 2 that hangs is connected to form by the crossbeam 213 of the level upper end by the bearing pin joint pin 214 vertical with two that are positioned at the crossbeam two ends; The lower end of two joint pins 214 is connected to two vertical relative hanging between the yoke web joint 16 of the relative both sides of cylindrical shell 14; Crossbeam 213 is to be connected to form by bearing pin by two blocks of vertical steel plates, be welded with respectively two block plates 216 at the middle part of 213 liang of block plates of crossbeam, the lifting pin is through between two block plates 216, top at the lifting pin is provided with a hand-rail type leading screw driving mechanism 26, by this driving mechanism, can move the position of lifting pin, so that the suspension hook of crane puts down and centering, and then pass through this driving mechanism so that lifting pin homing; There are being two center of gravity regulating blocks to be bolted on respectively on two block plates 216 between two block plates 216, and between center of gravity regulating block and steel plate 216, be provided with the adjustment pad, equipment is used for the position of center of gravity regulating block is adjusted, so that during the lifting of the suspension hook of crane, can keep balance; At an end of crossbeam 213, and tracheae angle sheave I21 is installed between its two block plate; At the other end of crossbeam 213, and cable angle sheave I27 is installed between its two block plate; Two joint pin 214 inside have rectangular channel along axis, upper end at the joint pin 214 that tracheae angle sheave I21 one side is installed is equipped with tracheae fixed pulley group 22 by bearing pin, in the rectangular channel of these joint pin 214 inside tracheae running block 23 is installed, the middle part installed inside of these joint pin 214 outside surfaces has tracheae angle sheave II24; Upper end at the joint pin 214 that cable angle sheave I27 one side is installed is equipped with cable fixed pulley group 28 by bearing pin, in the rectangular channel of these joint pin 214 inside the cable running block is installed, the middle part installed inside of these joint pin 214 outside surfaces has cable angle sheave II212, and in a side relative with cable angle sheave II212 electric control box 210 is installed, the various cables that the shielded coffin operation is required and the interface of tracheae, power supply and source of the gas and shielded coffin etc. all are installed in the electric control box 210; And tracheae angle sheave II24 is relative with cable angle sheave II212; Electric Chain Blocks 3 is installed in the lower end, middle part of crossbeam 213, be equipped with on it and highly indicate control module 211, highly indicate control module 211 to comprise flip flop equipment and Displaying Meter, wherein flip flop equipment is installed on the Electric Chain Blocks 3, be used for gathering the altitude signal of spentnuclear fuel basket, Displaying Meter is installed in the electric control box 210, is used for showing the height of spentnuclear fuel basket; Load transducer 29 and overweight protection control module 215 also are installed above Electric Chain Blocks 3, load transducer 29 gathers the weight signal of spentnuclear fuel basket lifting process, overweight protection control module 215 obtains to judge behind this weight signal, if weight signal is unusual, then controls Electric Chain Blocks 3 and stop action; The bottom of gripping apparatus head adapter 25 is cylindrical, columniform top is disk, and disk diameter is greater than columniform diameter, have three vertical through holes on the disk, pass for two tracheaes (draft tube and escape pipe) and a cable, one end of gripping apparatus head adapter 25 disks is connected with the loop chain of Electric Chain Blocks 3, and a columniform end is connected by bearing pin with the gripping apparatus head, and gripping apparatus head adapter 25 extend into the shielding cylinder 1 with the through hole of gripping apparatus head from the top cover 12 of shielding cylinder 1; Wherein the arrangement of two tracheaes and a cable is as follows: two tracheaes are drawn from electric control box 210, pass through successively tracheae running block 23, tracheae fixed pulley group 22, tracheae angle sheave I21 and tracheae angle sheave II24, two vertical through holes from gripping apparatus head adapter 25 disks pass again; A cable is drawn from electric control box 210, passes through successively cable running block, cable fixed pulley group 28, cable angle sheave I27 and cable angle sheave II212, and another the vertical through hole from gripping apparatus head adapter 25 disks passes again; After two tracheaes and a cable pass from gripping apparatus head adapter 25, all be connected with the gripping apparatus head; When gripping apparatus head adapter 25 and gripping apparatus head move upward, trigger the frizzen of the top cover 12 interior installations of shielding cylinder 1, frizzen is by jack-up, the approach switch A11 that is installed on the top cover 12 of shielding cylinder 1 is triggered, Electric Chain Blocks 3 stops action, thereby realizes the limit function to tracheae and cable.
As shown in Figure 4, described translation door 6 is filled with lead for the outer steel intralamellar part and is made, its left and right sides is equipped with rail wheel 31, translation door driving mechanism 5 is installed in the rear end of track extended structure 36, translation door 6 can move at track extended structure 36 along the track 32 that install translation gate slot 110 both sides of shielding cylinder 1 under its effect, and can enter in the translation gate slot 110 of shielding cylinder 1; Translation door driving mechanism 5 comprises motor 33, bearing 34 and leading screw, and bearing 34 is installed in the rear end of track extended structure 36, and motor 33 is installed on the bearing 34, and motor 33 drives guide screw movement, and leading screw drives translation door 6 motions; Rear end at track extended structure 36 also is equipped with approach switch C35, the signal that puts in place of opening as translation door 6.
As shown in Figure 5, the crane span structure 4 of described steel is positioned at the top of track extended structure 36, formed by a platform 41 and the guardrail 42 that two rows that are positioned at platform 41 tops be arranged in parallel, one end of platform 41 is connected on the cylindrical shell 14 of shielding cylinder 1, between two row's guardrails 42, protective door 43 is installed, is respectively arranged with People's Bank of China's ladder 44 in the both sides of platform 41 lower ends; Crane span structure 4 is connected support with the angle steel 19 of shielding cylinder 1; Also be provided with some connecting links 45 on track extended structure 36, its other end and shielding cylinder 1 are bolted; Crane span structure 4 provides outside the pond workbench to the passage of another side for operating personnel.
The workflow of this shielded coffin is as follows:
Before the spentnuclear fuel cluster is transported from the spentnuclear fuel pond, the spentnuclear fuel cluster shifts out from tumbler first, and put into the spentnuclear fuel basket, and the spentnuclear fuel basket directly hangs in the shielding work box by the skewed slot of shielding, and shielded coffin is positioned on the opening at shielding work box top.After the oven dry of spentnuclear fuel basket and seal welding, the translation door 6 of shielded coffin is opened fully, and stays open state until the spentnuclear fuel basket hangs in the shielding cylinder 1 of shielded coffin by hanging yoke assembly 2 dresses.
In case the spentnuclear fuel basket is promoted in the shielding cylinder 1 of shielded coffin fully, the translation door 6 of shielded coffin is closed and is pinned by translation door lock 17, and then the spentnuclear fuel basket is fallen and is shelved on the translation door 6.In this operating process, the gripping apparatus head that hangs yoke assembly 2 remains and being connected of spentnuclear fuel basket.Then the crane that extends in the factory building is hung oneself away shielded coffin from the shielding work box, and it is put on the trailer fixing, then is transported to the module storage area.
At the module storage area, guide piece is in place at the dry storage module for heavy water reactor irradiated fuel top; Trailer need to be positioned by the module of operation; The trestle crane main hook winches to the module top with shielded coffin from trailer, and shielded coffin is moved in the guide piece, and plug is loaded in the secondary hook of crane lifting, and 2 suspension hooks are mobile simultaneously.When shielded coffin moves when in place, load plug and be moved to another side; Then shielded coffin decline enters on the guide piece that is fixed on the storage tube.
After the spentnuclear fuel basket promotes and leaves the translation door 6 of shielded coffin, remove the lock-out state of translation door lock 17, then open translation door 6 and relock translation door lock 17, then hang at leisure the spentnuclear fuel basket in the storage tube by hanging yoke assembly 2; In place when the spentnuclear fuel basket, the gripping apparatus head that hangs yoke assembly 2 unclamps the spentnuclear fuel basket, and turns back in the shielded coffin; Remove the lock-out state of translation door lock 17 this moment, then opens translation door 6 and relock translation door lock 17; Shielded coffin transport back the shielding work box process just in time in contrast.Repeat above operating process each spentnuclear fuel basket is packed in the storage tube of dry storage module for heavy water reactor irradiated fuel, until till storage tube fills.