CN210073345U

CN210073345U - Spent fuel transport container

Info

Publication number: CN210073345U
Application number: CN201821738487.3U
Authority: CN
Inventors: 盛选禹; 成昱旻; 孔文文; 陈贺; 徐雅晨; 孙嘉琦; 邵荣; 王岳巍; 陈敬旭
Original assignee: Tsinghua University; Tianjin Institute of Advanced Equipment of Tsinghua University
Current assignee: Tsinghua University; Tianjin Institute of Advanced Equipment of Tsinghua University
Priority date: 2018-10-25
Filing date: 2018-10-25
Publication date: 2020-02-14
Anticipated expiration: 2028-10-25

Abstract

The utility model provides a spent fuel transport container, which comprises a cylinder body and a spent fuel grillwork, wherein the top of the cylinder body is provided with an opening; spent fuel grillage sets up inside the barrel, is equipped with the first shielding structure of radiation that can shield radiation in the barrel wall, and the barrel outside is equipped with the bumper shock absorber structure, and the barrel top is equipped with hangs trunnion structure, and the barrel bottom is equipped with upset trunnion structure, and the barrel opening part is equipped with the flange that can shield radiation, and the flange can be dismantled with the barrel top and be connected. The utility model discloses create a spent fuel transport container, solved the safety problem that radioactive substance such as spent fuel need guarantee the transportation in the transportation.

Description

Spent fuel transport container

Technical Field

The invention belongs to the technical field of nuclear, and particularly relates to a spent fuel transportation container.

Background

The disposal of radioactive waste involves significant transportation efforts to transfer the waste from the production site to the final storage site. The transportation of spent fuel puts special requirements on transportation equipment and transportation supervision. Spent fuel contains fission products, making it highly radioactive. It also generates heat. Since spent fuel also contains fissionable materials, hazards must be considered. This puts special demands on the design of the transport cask. Efficient heat dissipation requires a large cooling surface area. Meanwhile, radioactive substances such as spent fuel need to be transported safely in the transportation process.

Disclosure of Invention

In view of the above, the present invention provides a spent fuel transportation container, which solves the problem that transportation safety needs to be ensured during transportation of radioactive substances such as spent fuel.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a spent fuel transport container comprises a cylinder body and a spent fuel grillwork, wherein the top of the cylinder body is provided with an opening;

the spent fuel grillwork is arranged in the barrel, a radiation first shielding structure capable of shielding radiation is arranged in the barrel wall, a shock absorber structure is arranged outside the barrel, a hanging trunnion structure is arranged at the top end of the barrel, a turning trunnion structure is arranged at the bottom end of the barrel,

the opening of the cylinder body is provided with a flange capable of shielding radiation, and the flange is detachably connected with the top end of the cylinder body.

Furthermore, the shock absorber structure comprises a first shock absorber and a second shock absorber, the first shock absorber is sleeved on the top of the outer wall of the barrel, and the second shock absorber is sleeved on the bottom of the side wall of the outer wall of the barrel and the lower end face of the barrel.

Further, hang gudgeon structure and include two and hang gudgeon, two it sets up to hang gudgeon symmetry both ends about the barrel, each it all runs through to hang gudgeon first bumper shock absorber, each it all with the barrel rotates and is connected.

Further, upset trunnion structure includes two upset trunnions, two upset trunnion symmetry sets up both ends about the barrel, each the upset trunnion all runs through the second bumper shock absorber, each the upset trunnion all with the barrel rotates to be connected.

Further, the barrel from inside to outside includes inner shell, mesochite and shell in proper order, first shielding structure sets up between inner shell and the mesochite and between mesochite and the shell.

Further, first shielding structure includes multilayer lead plate and multilayer boron polyethylene layer, each boron polyethylene layer all sets up between two-layer lead plate.

Further, the inner shell, the middle shell and the outer shell are carbon steel shells.

Further, the flange bottom is equipped with the top cap, be equipped with second shielding structure in the top cap, second shielding structure includes the circular stereotype of multilayer and the circular boron polyethylene layer of multilayer, each circular boron polyethylene layer all sets up between two-layer circular stereotype.

Compared with the prior art, the spent fuel transport container has the following advantages:

the invention provides a spent fuel transport container, which comprises a first shock absorber and a second shock absorber, wherein the first shock absorber and the second shock absorber are respectively arranged at two ends of a cylinder body, and the first shock absorber and the second shock absorber adopt a structure with built-in springs and absorb vibration through the springs. During transportation, vibrations caused to the transport vehicle are transmitted to the transport container due to the uneven road surface. Since the spent fuel being transported has been used in the reactor for a long time, is subjected to thermal fatigue, coolant impact load, etc., the cladding structure of the spent fuel is not as strong as the new fuel. The severe vibration is a mechanical fatigue load for spent fuel cladding. If the envelope is broken, serious consequences can occur, and radioactive gases and dust in the envelope can be discharged, thereby causing great harm to the environment and transportation personnel. This is absolutely avoided during the transportation of spent fuel. On the reactor, the fuel clad is the first barrier to shielding, which ensures that gases and dust generated by the fuel in the nuclear reaction do not leak into the environment. For shipping, the enclosure remains the first barrier and it must be ensured that the enclosure cannot be broken. Without the bumper shock absorber, the transport vechicle is when walking on the road, if there is big roadblock, produces than great vibration, can produce than great mechanical fatigue destruction to the fuel package shell. With the shock absorber, cracking of the envelope can be avoided. The shock absorber is connected with the transport container barrel through the connecting bolt, so that the shock absorber can be guaranteed to have a shock absorption effect, and meanwhile, the shock absorber can be guaranteed to be fixedly connected with the barrel; the first shock absorber and the second shock absorber are used for absorbing impact energy under the working condition of normal transportation and accident falling in the spent fuel transportation process, the impact resistance of the spent fuel can be improved, the influence on the spent fuel is reduced, and the safety of spent fuel transportation is guaranteed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:

fig. 1 is a schematic structural view of a spent fuel transport container according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a spent fuel grid in a spent fuel transportation container according to an embodiment of the present invention.

Description of reference numerals:

1-spent fuel grillwork; 2-suspension trunnion; 3-turning over the trunnion; 4-top flange; 5-a top damper; 6-cylinder body; 7-a tail damper; 8-top cover.

Detailed Description

It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.

The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.

A spent fuel transport container comprises a cylinder body 6 with an opening at the top and a spent fuel grillwork 1;

the spent fuel grillwork 1 is arranged inside the cylinder 6, a first radiation shielding structure capable of shielding radiation is arranged in the wall of the cylinder 6, a shock absorber structure is arranged outside the cylinder 6, a suspension trunnion structure is arranged at the top end of the cylinder 6, a turnover trunnion structure is arranged at the bottom end of the cylinder 6,

the opening of the cylinder body 6 is provided with a flange 4 capable of shielding radiation, and the flange 4 is detachably connected with the top end of the cylinder body 6.

The shock absorber structure comprises a first shock absorber 5 and a second shock absorber 7, the first shock absorber and the second shock absorber adopt a structure with a built-in spring, the first shock absorber 5 is sleeved on the top of the outer wall of the barrel body 6, and the second shock absorber 7 is sleeved on the bottom of the side wall of the outer wall of the barrel body 6 and the lower end face of the barrel body 6.

The suspension trunnion structure includes two suspension trunnion shafts 2, and two 2 symmetry settings of suspension trunnion shaft are both ends about barrel 6, and each suspension trunnion shaft 2 all runs through first bumper shock absorber 5, and each suspension trunnion shaft 2 all rotates with the barrel to be connected, and suspension trunnion shaft 2 can enough fix first bumper shock absorber 5, can play the supporting role that lifts by crane at the in-process of loading and unloading barrel 6 again.

The trunnion structure that overturns includes that two upset trunnions 3, two 3 symmetry settings of upset trunnion are both ends about barrel 6, and each upset trunnion 3 all runs through second bumper shock absorber 7, and each upset trunnion 3 all is connected with the barrel rotation, and upset trunnion 3 can enough fix second bumper shock absorber 7, can play the effect of stabilizing barrel 6 again at the in-process of loading and unloading barrel 6.

The cylinder 6 comprises an inner shell, a middle shell and an outer shell in sequence from inside to outside, and the first shielding structures are arranged between the inner shell and the middle shell and between the middle shell and the outer shell.

First shielding structure includes multilayer stereotype and multilayer boron polyethylene layer, and each boron polyethylene layer all sets up between two-layer stereotype, and then the beneficial effect that can play has following two points: (1) the weight is reduced; and (2) can shield both gamma and neutron. The loading capacity of the transport vehicle is improved at present, and if the weight of the transport container is not considered, the outer wall of the cylinder body 6 can be coated with heavy concrete, so that the cost is reduced, and the shielding effect is good. The heavy concrete is prepared by adding steel shot into common concrete.

The inner shell, the middle shell and the outer shell are carbon steel shells, and the inner shell, the middle shell and the outer shell are all welded. However, since the entire transport container is to be submerged when the material is poured, the portion exposed to the water pool and in contact with the water is made of stainless steel (304 stainless steel).

4 bottoms of flange are equipped with top cap 8, are equipped with second shielding structure in the top cap 8, and second shielding structure includes the circular stereotype of multilayer and the circular boron polyethylene layer of multilayer, each circular boron polyethylene layer all sets up between two-layer circular stereotype.

Working mode of the example

The shock absorber structure comprises a first shock absorber and a second shock absorber, the first shock absorber 5 and the second shock absorber 7 are respectively arranged at two ends of the cylinder body, the first shock absorber and the second shock absorber adopt a structure with built-in springs, and vibration is absorbed through the springs. During transportation, vibrations caused to the transport vehicle are transmitted to the transport container due to the uneven road surface. Since the spent fuel being transported has been used in the reactor for a long time, is subjected to thermal fatigue, coolant impact load, etc., the cladding structure of the spent fuel is not as strong as the new fuel. The severe vibration is a mechanical fatigue load for spent fuel cladding. If the envelope is broken, serious consequences can occur, and radioactive gases and dust in the envelope can be discharged, thereby causing great harm to the environment and transportation personnel. This is absolutely avoided during the transportation of spent fuel. On the reactor, the fuel clad is the first barrier to shielding, which ensures that gases and dust generated by the fuel in the nuclear reaction do not leak into the environment. For shipping, the enclosure remains the first barrier and it must be ensured that the enclosure cannot be broken. Without the bumper shock absorber, the transport vechicle is when walking on the road, if there is big roadblock, produces than great vibration, can produce than great mechanical fatigue destruction to the fuel package shell. With the shock absorber, cracking of the envelope can be avoided. The shock absorber is connected with the transport container barrel through the connecting bolt, so that the shock absorber can be guaranteed to have a shock absorption effect, and meanwhile, the shock absorber can be guaranteed to be fixedly connected with the barrel; the first damper 5 and the second damper 7 are used for absorbing impact energy under normal transportation and accident falling working conditions in the spent fuel transportation process, so that the impact resistance of the spent fuel can be improved, the influence on the spent fuel is reduced, and the safety of spent fuel transportation is ensured.

In the nuclear power station, the spent fuel transport container is firstly kept in an open state, the top cover 8 is not installed, spent fuel is loaded into the transport container, and then the top cover 8 is covered and fastened by bolts.

After the spent fuel is transported to the destination, the spent fuel needs to be taken out, and the process is reversed, namely, the bolt is unscrewed, the top cover 8 is taken away, and then the spent fuel is taken out to the storage pool.

The invention is not limited to the specific embodiments described above, but rather should be construed as broadly as possible, and all changes, equivalents, and improvements that fall within the spirit and scope of the invention are intended to be embraced therein.

Claims

1. A spent fuel transport container is characterized in that: comprises a cylinder body (6) with an opening at the top and a spent fuel grillwork (1);

the spent fuel grillwork (1) is arranged inside the barrel (6), a first radiation shielding structure capable of shielding radiation is arranged in the barrel wall of the barrel (6), a shock absorber structure is arranged outside the barrel (6), a hanging trunnion structure is arranged at the top end of the barrel (6), a turning trunnion structure is arranged at the bottom end of the barrel (6),

the opening of the cylinder body (6) is provided with a flange (4) capable of shielding radiation, and the flange (4) is detachably connected with the top end of the cylinder body (6).

2. The spent fuel transport container according to claim 1, wherein: the shock absorber structure comprises a first shock absorber (5) and a second shock absorber (7), wherein the first shock absorber (5) is sleeved at the top of the outer wall of the barrel body (6), and the second shock absorber (7) is sleeved at the bottom of the side wall of the outer wall of the barrel body (6) and the lower end face of the barrel body (6).

3. The spent fuel transport container according to claim 2, wherein: the suspension trunnion structure includes two suspension trunnion shafts (2), two suspension trunnion shaft (2) symmetry sets up both ends about barrel (6), each suspension trunnion shaft (2) all run through first bumper shock absorber (5), each suspension trunnion shaft (2) all with the barrel rotates to be connected.

4. The spent fuel transport container according to claim 3, wherein: the upset trunnion structure includes two upset trunnions (3), two upset trunnion (3) symmetry sets up both ends about barrel (6), each upset trunnion (3) all run through second bumper shock absorber (7), each upset trunnion (3) all with the barrel rotates to be connected.

5. The spent fuel transport container according to claim 1, wherein: the barrel (6) comprises an inner shell, a middle shell and an outer shell from inside to outside in sequence, and the first shielding structure is arranged between the inner shell and the middle shell and between the middle shell and the outer shell.

6. The spent fuel transport container according to claim 5, wherein: first shielding structure includes multilayer lead plate and multilayer boron polyethylene layer, each boron polyethylene layer all sets up between two-layer lead plate.

7. The spent fuel transport container according to claim 6, wherein: the inner shell, the middle shell and the outer shell are carbon steel shells.

8. The spent fuel transport container according to any one of claims 5 to 7, wherein: the flange (4) bottom is equipped with top cap (8), be equipped with second shielding structure in top cap (8), second shielding structure includes the circular stereotype of multilayer and the circular boron polyethylene layer of multilayer, each circular boron polyethylene layer all sets up between two-layer circular stereotype.