CN210606658U

CN210606658U - Spent fuel pool and plugging device for pipeline break accident of spent fuel pool

Info

Publication number: CN210606658U
Application number: CN201921409576.8U
Authority: CN
Inventors: 杨江; 纪文英; 梁活; 刘仲昊; 罗汉炎; 刘建昌; 陈韵茵; 王仙茅; 崔旭阳; 路长冬; 沈永刚; 张田; 卢向晖
Original assignee: China General Nuclear Power Corp; China Nuclear Power Technology Research Institute Co Ltd; CGN Power Co Ltd
Current assignee: China General Nuclear Power Corp; China Nuclear Power Technology Research Institute Co Ltd; CGN Power Co Ltd; China Nuclear Power Institute Co Ltd
Priority date: 2019-08-27
Filing date: 2019-08-27
Publication date: 2020-05-22
Anticipated expiration: 2029-08-27

Abstract

The utility model relates to a spent fuel pool and a plugging device for a pipeline breach accident of the spent fuel pool; the spent fuel pool comprises a pool body with a hole at the bottom and a pipeline connected at the hole; comprises a plugging body, a supporting component and a force application component; the blocking body is arranged in the pool body of the spent fuel pool and is opposite to the opening, and the size of the blocking body is larger than that of the opening so as to block the pipeline when the pipeline is exploded; the supporting component is arranged in the pool body of the spent fuel pool, and is connected with the plugging body and the force application component so as to support the plugging body under normal working conditions, and under the condition of breaking, the plugging body can be blocked by the axial movement of the pipeline along the plugging body due to the force application of the force application component. This a plugging device for broken mouthful accident of spent fuel pool pipeline effectively blocks up the trompil of being connected with the pipeline, and it has simple structure, easy to carry out's advantage.

Description

Spent fuel pool and plugging device for pipeline break accident of spent fuel pool

Technical Field

The utility model relates to a nuclear reactor, more specifically say, relate to a spent fuel pool and be used for plugging device of the broken mouthful accident of spent fuel pool pipeline.

Background

After the fuel in the core of the nuclear power plant reaches the burn-up depth, the fuel is discharged from the reactor and moved to a Spent Fuel Pool (SFP) for storage. The spent fuel pool is generally located outside the containment of the nuclear power plant and is used for storing spent fuel unloaded from the reactor. Because the spent fuel has radioactivity, the fuel assembly needs to be contained by water to shield the radioactivity; in addition, since the spent fuel continuously generates decay heat, a cooling system is required to cool the high-temperature water in the pool.

The conventional spent fuel dense storage grid of the nuclear power plant can store 619 fuel assemblies, and the improved 10 multiplied by 7 grid module can be used for storing 5 damaged element storage boxes. The grid is provided with an integral neutron absorbing material for maintaining the required subcritical degree, and the grid is designed to store the fuel with the highest design reference enrichment degree. The grid assembly is free standing and is not fixed to the floor of the pool nor is it transversely connected to the pool wall. The spent fuel storage device is positioned in the anti-seismic type I auxiliary plant fuel operation area. The water pool is about 12.96m deep, and a reinforced concrete and concrete filling module structure is adopted. The parts of the structural modules that come into contact with the pond water are stainless steel, and the reinforced concrete parts are lined with stainless steel plates. The normal water volume of the basin is about 685 cubic meters with a nominal boron concentration of 2500 ppm.

Spent fuel pools are typically connected to a plurality of pipes which are used for cooling or top fill and bottom drain functions and some of which are located at the bottom of the pool. If the pipelines are broken, cooling water of the spent fuel pool is lost from the broken parts, and water storage of the pool is lost, so that fuel safety is endangered.

In the design of the spent fuel pool of the traditional nuclear power plant, if the pipeline at the bottom of the spent fuel pool is broken, the pipeline is mainly used for isolation and additional water supplement, and a low liquid level alarm is usually sent from a main control room to remind an operator to supplement water for the spent fuel pool. When the operator starts the water replenishing system, the operator can manually adjust the water replenishing flow according to the indication of the liquid level meter during water replenishing operation, and water loss and soluble boron loss caused by excessive water replenishing are avoided. The pipeline isolation cannot be effective in all positions (the break between the isolation valve and the water pool cannot be isolated), systems and equipment for additionally supplementing water are large in size and cost, instrument monitoring, trigger signals and external power equipment need to be arranged on the pipeline, and the pipeline isolation system is inconvenient to install, complex in structure and high in cost. In addition, the water replenishing system of the current spent fuel pool generally comprises: the water replenishing water source storage container, the water replenishing pipeline, the water replenishing pump and the like, the system equipment is very complex, and the economic cost is higher.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in providing a can block up the shutoff device that is used for the broken mouth accident of spent fuel pool pipeline that the pipeline prevents the liquid loss of spent fuel pool when the broken mouth accident of spent fuel pool pipeline takes place, further provide a spent fuel pool.

The utility model provides a technical scheme that its technical problem adopted is: constructing a plugging device for a pipeline breach accident of a spent fuel pool, wherein the spent fuel pool comprises a pool body with an opening at the bottom and a pipeline connected at the opening; comprises a plugging body, a supporting component and a force application component;

the blocking body is arranged in the pool body of the spent fuel pool and is opposite to the opening, and the size of the blocking body is larger than that of the opening so as to block the pipeline when the pipeline is exploded;

the supporting component is arranged in the pool body of the spent fuel pool, and is connected with the plugging body and the force application component so as to support the plugging body under normal working conditions, and under the condition of breaking, the plugging body can be blocked by the axial movement of the pipeline along the plugging body due to the force application of the force application component.

Preferably, the supporting component comprises at least two supporting rods which are arranged on the outer side wall of the blocking body, connected with the pool body of the spent fuel pool and can be damaged.

Preferably, the force application assembly comprises at least two groups of force application mechanisms which are arranged corresponding to the at least two support rods.

Preferably, each group of force application mechanisms comprises a traction piece which is connected with the supporting rod and can be movably arranged.

Preferably, each set of force applying means further comprises guide means for guiding said traction member.

Preferably, the traction element comprises a traction rope or a traction chain;

the guide mechanism comprises a pulley assembly arranged on the side wall of the spent fuel pool.

Preferably, the force application assembly comprises an operating rod arranged on one side of the blocking body opposite to the pipeline and arranged along the axial direction of the pipeline, and a force application component applying force to the operating rod along the axial direction of the operating rod.

Preferably, the occluding body is in the shape of an inverted cone.

The utility model discloses still construct a spent fuel pool, include the cell body, the setting that are equipped with the trompil in the bottom be in trompil department with the pipeline and the setting of cell body intercommunication are in the cell body a plugging device for the broken mouthful accident of spent fuel pool pipeline.

Preferably, the size of the occluding body of the occluding device is larger than the size of the opening.

Implement the utility model discloses a plugging device in spent fuel pond and be used for the broken mouthful accident of spent fuel pond pipeline has following beneficial effect: a plugging device for spentnuclear fuel pool pipeline breach accident is through setting up the trompil size that the size is greater than the cell body bottom in spentnuclear fuel pool and the relative jam body that sets up with this trompil, and set up the supporting component who is connected with this jam body and application of force subassembly in the cell body in this spentnuclear fuel pool, thereby this blocking body can be supported to this supporting component under normal operating mode, under the breach operating mode, but this supporting component application of force subassembly application of force destroys, make the axial displacement of jam body along the pipeline block up the trompil, and then can block up the pipeline at the most upper reaches of pipeline, liquid loss in the spentnuclear fuel pool when effectively preventing the pipeline breach. This a plugging device for broken mouthful accident of spent fuel pool pipeline effectively blocks up the trompil of being connected with the pipeline, and it has simple structure, easy to carry out's advantage.

This spent fuel pond is through setting up in the cell body the utility model discloses a plugging device for spent fuel pond pipeline breach accident can effectively block up the trompil with the pipe connection under the breach operating mode, reduces liquid loss in the cell body in spent fuel pond.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a schematic structural diagram of a first embodiment of a spent fuel pool according to the present invention;

fig. 2 is a schematic structural diagram of a spent fuel pool according to a second embodiment of the present invention.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 shows a first embodiment of the fuel pool of the present invention. The spent fuel pool can be used for storing spent fuel unloaded from the reactor, wherein cooling water can be introduced to take away decay heat of the spent fuel. The spent fuel pool can comprise a pool body 10, a pipeline 20 and a plugging device 30 for the pipeline breach accident of the spent fuel pool; the bottom of the tank 10 may be opened with an opening, the opening may be connected to the pipe 20, and through the opening, the liquid in the tank 10 may be discharged through the pipe 20. The pipeline 20 is disposed on the tank body 10 and is connected to the tank body 10, and one end of the pipeline connected to the opening may be in an inverted cone shape. The plugging device 30 may be disposed in the cell body 10, which may plug the opening under a breaching condition.

Further, in some embodiments, the occluding device 30 may include an occluding body 31, a support assembly 32, and a force application assembly 33; this jam body 31 can set up in the cell body 10 in this spent fuel pond, can set up with this trompil relatively, under normal operating mode, its and this trompil interval set up, and it can be under the broken mouth operating mode, and this trompil is blockked up along pipeline 20's axial displacement to can be at pipeline 20's the most upstream, keep apart the liquid in the cell body 10 in spent fuel pond, prevent that liquid from running off. This supporting component can set up in the cell body in this spent fuel pond, and it can be connected with this jam body 31, and it can be at this jam body 31 of normal operating mode under bracing, vacates this jam body 31 and sets up on this trompil, and it can be under broken mouthful operating mode, is destroyed by this application of force subassembly and makes this trompil of jam body along the axial displacement of pipeline 20. The force application component 33 is connected to the support component 32, and can break the support component 32 under a breach condition, so that the blocking body 31 falls off.

Further, in the present embodiment, the blocking body 31 may be made of stainless steel, and may be a solid structure; of course, it is understood that in other embodiments, it may be made of rubber, silicon or other metal materials. The shape of this jam body 31 and the shape looks adaptation of this trompil, and the size of this jam body 31 is greater than the size of this trompil, specifically speaking, this jam body 31 can be the back taper, and its biggest external diameter is greater than the internal diameter of this trompil, and it can be after taking place pipeline 20 to break a mouthful, falls to this trompil department, and along the axial displacement of this pipeline 20 to closely laminate with the pipe wall of this trompil department, thereby blocks up this pipeline 20, avoids the liquid in this cell body 10 to flow out from this pipeline 20.

Further, in the present embodiment, the supporting assembly 32 may include two supporting rods 321; it is understood that in other embodiments, the support assembly 32 may not be limited to include two support rods 321, and may include a plurality of support rods 321. Two support rods 321 may be disposed on the outer side wall of the blocking body 31 and connected to the spent fuel pool body 10. The two support rods 321 may be located at two opposite sides of the opening, and they may be distributed in a shape of a Chinese character 'ba' to support the blocking body 31. It is understood that, in other embodiments, when there are a plurality of support rods 321, two support rods 321 oppositely disposed may be distributed in a shape of a Chinese character 'ba'.

Further, in this embodiment, the supporting rod 321 may be made of a metal material, specifically, it may be made of a stainless steel material, the supporting rod 321 may be in a longitudinal sheet shape or a column shape, one end of the supporting rod may be used to support the blocking body 31, it may be welded to the blocking body 31, or connected to the blocking body 31 by a screw and a nut, the other end may be fixed to the bottom of the cell body 10, it may be welded to the cell body 10, or connected to the bottom wall of the cell body 10 by a screw and a nut.

Further, in this embodiment, the force application assembly 33 may include two sets of force application mechanisms; it is understood that, in other embodiments, the number of the force application assemblies 33 is not limited to two, and may be a plurality of force application assemblies, which may be disposed in one-to-one correspondence with the support rods 321. The force applying mechanism can be disposed in the tank body 10 and can be correspondingly connected to the supporting rod 321.

Further, in this embodiment, each set of force applying mechanisms may include a traction member 331; the pulling member 331 is connected to the supporting rod 321, and pulls the supporting rod 321 to apply a force to the supporting rod 321, so as to break the supporting rod 321. The pulling member 331 may be a pulling rope or a chain. The pulling member 331 can extend out of the opening of the tank 10 for easy pulling by an operator.

Further, in the present embodiment, each set of force application mechanisms may further include a guide mechanism 332; the guiding mechanism 332 can be used for guiding the traction member 331, the guiding mechanism 332 can be disposed on a side wall of the tank body 10, it can be a pulley assembly, it can include two or more pulleys, the pulleys can be disposed on a side wall of the tank body 10, the traction member 331 can be wound on the pulleys, and the traction direction of the traction member 331 can be changed through the pulleys. It is understood that in other embodiments, the number of the pulleys is not limited to two or more, and may be one. In other embodiments, the guide mechanism 332 may be omitted.

Fig. 2 shows a second embodiment of the spent fuel pool of the present invention, which is different from the first embodiment in that both the drawing member 331 and the guiding mechanism 332 can be omitted. The force application assembly 33 may include an operating rod 333 and a force application member 334; the operating rod 333 may be disposed on a side of the blocking body 31 opposite to the pipe 20, and may be disposed along an axial direction of the pipe 20, and may be disposed through the tank 10 for an operator to operate. The operating rod 333 may be made of a metal material, and specifically, it may be made of a stainless steel material. The force applying member 334 may be a hammer, which is operated by an operator to apply a pressure to the operating rod 333 along the axial direction of the operating rod 333, so that the supporting rod 321 cannot bear the weight of the blocking body 31 and the pressure applied by the force applying member 334 to break, thereby allowing the blocking body 31 to fall and block the opening.

It is to be understood that the foregoing examples merely represent preferred embodiments of the present invention, and that the description thereof is more specific and detailed, but not intended to limit the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. A plugging device for a pipeline breach accident of a spent fuel pool comprises a pool body (10) with an opening at the bottom and a pipeline (20) connected at the opening; the device is characterized by comprising a blocking body (31), a supporting component (32) and a force application component (33);

the blocking body (31) is arranged in the pool body (10) of the spent fuel pool and is opposite to the opening, and the size of the blocking body (31) is larger than that of the opening so as to block the pipeline (20) when the pipeline (20) is exploded;

the supporting component (32) is arranged in a pool body (10) of the spent fuel pool, and is connected with the blocking body (31) and the force application component (33) so as to support the blocking body (31) under normal working conditions, and under the condition of breaking, the force application component (33) applies force to destroy the blocking body (31) to block the opening hole along the axial movement of the pipeline (20).

2. The plugging device for a pipe break accident of a spent fuel pool according to claim 1, wherein the support assembly (32) comprises at least two support rods (321) which are arranged on the outer side wall of the plugging body (31) and connected with the pool body (10) of the spent fuel pool and can be broken.

3. The plugging device for the pipe break accident of the spent fuel pool according to claim 2, wherein the force application assembly (33) comprises at least two sets of force application mechanisms corresponding to the at least two support rods (321).

4. The plugging device for the pipe break accident of the spent fuel pool according to claim 3, wherein each set of the force applying mechanism comprises a pulling member (331) connected with the supporting rod (321) and movably arranged.

5. The plugging device for the pipe break accident of the spent fuel pool according to claim 4, wherein each set of the forcing mechanisms further comprises a guiding mechanism (332) guiding the traction member (331).

6. The plugging device for a pipe break accident of a spent fuel pool according to claim 5, wherein the traction member (331) comprises a traction rope or a traction chain;

the guide mechanism (332) comprises a pulley assembly arranged on the side wall of the spent fuel pool body (10).

7. The plugging device for a spent fuel pool pipeline breach accident according to claim 1, wherein the force application assembly (33) comprises an operating rod (333) arranged on a side of the plugging body (31) opposite to the pipeline (20) and arranged along an axial direction of the pipeline (20), and a force application member (334) applying force to the operating rod (333) along the axial direction of the operating rod (333).

8. The plugging device for a pipe break accident of a spent fuel pool according to claim 1, wherein the plugging body (31) is in an inverted cone shape.

9. A spent fuel pool, characterized by comprising a pool body (10) provided with an opening at the bottom, a pipeline (20) arranged at the opening and communicated with the pool body (10), and a plugging device (30) arranged in the pool body (10) for the pipeline breach accident of the spent fuel pool according to any one of claims 1 to 8.

10. The spent fuel pool according to claim 9, wherein the plugging body (31) of the plugging device has a size larger than the size of the opening.