Retention basket and refueling water tank in containment of nuclear power station

Abstract

The utility model belongs to the technical field of nuclear power station containment vessels, and particularly relates to a retention basket and a refueling water tank in a nuclear power station containment vessel. The retention basket comprises a retention box and a plurality of buffer discs; the retention box is provided with a first internal space, a second internal space and a water inlet hole, and the first internal space is communicated with the water inlet hole and the second internal space; a plurality of water outlet holes communicated with the second internal space are formed in the side wall and the bottom wall of the retention box; the buffer discs are mounted in the first internal space at intervals; the buffer disc comprises a supporting frame and a buffer film installed on the supporting frame, and a plurality of first through holes are formed in the buffer film. In the embodiment, the multiple buffer discs have multiple buffer effects on water flow, so that the impact force of the water flow flowing out of the water outlet holes is small. In addition, the first through holes in the buffer disc and the water outlet holes in the detention box have the filtering effect, and the water flow filtering effect of the detention box is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of nuclear power plant containments, and particularly relates to a retention basket and a refueling water storage tank built in a nuclear power plant containment. Background Art

[0002] As a refueling water storage tank of the nuclear power plant safety system, the refueling water storage tank built in the containment is built in the containment, which can better ensure the water volume balance of the boron-containing water in the reactor building. In the event of a break accident in the containment, the water bodies such as the spray water in the containment flow back to the refueling water storage tank built in the containment, and the water volume balance can be achieved. At present, the return water filtration of the refueling water storage tank built in the containment generally adopts the retention basket filtration method, and the leaked water and spray water are filtered and then recycled.

[0003] However, the existing refueling water storage tank built in the containment has the following disadvantages: the return water flows directly into the retention basket from above, and all the impact force of the return water is absorbed by the retention basket. The retention basket needs to bear a large impact load, which not only puts higher requirements on the material and support design of the retention basket, but also affects the operation stability of the refueling water storage tank built in the containment and increases the safety risk of the refueling water storage tank built in the containment. Summary of the Utility Model

[0004] In view of the above technical problems, the embodiment of the utility model provides a retention basket and a refueling water storage tank built in a nuclear power plant containment.

[0005] In view of the above technical problems, an embodiment of the present invention provides a retention basket, including a retention box and a plurality of buffer plates; a first internal space, a second internal space and a water inlet hole are provided on the retention box, and the first internal space communicates with the water inlet hole and the second internal space; a plurality of water outlet holes communicating with the second internal space are provided on the side wall and the bottom wall of the retention box;

[0006] The buffer plates are installed in the first internal space at intervals; the buffer plate includes a support frame and a buffer film installed on the support frame, and a plurality of first through holes are provided on the buffer film.

[0007] Optionally, the retention basket further includes a flow guide member installed in the first internal space, and the flow guide member is used to guide the water flowing in from the water inlet hole to the buffer plate;

[0008] The flow guide member includes a top frame, a bottom frame and a plurality of side plates connected in sequence. The opposite ends of the side plates are respectively connected to the top frame and the bottom frame, and a third internal space communicating with the first internal space is surrounded by the plurality of side plates; a plurality of second through holes communicating with the first internal space and the third internal space are provided on the side plates.

[0009] Optionally, an annular support plate is provided on the inner wall of the first inner space, and the bottom frame is mounted on the annular support plate.

[0010] Optionally, the buffer plate further includes a reinforcing plate mounted on the support frame, and the reinforcing plate connects the buffer film.

[0011] Optionally, there are a plurality of drawer slots spaced apart on the retention box, and the support frame is detachably mounted in the drawer slots.

[0012] Optionally, the buffer plate further includes a handle mounted on the support frame.

[0013] Optionally, the retention box includes a bottom box body and a top box body detachably mounted on the bottom box body. The water inlet hole is provided on the top box body, the second inner space and the water outlet hole are both provided on the bottom box body, and the first inner space is provided between the top box body and the bottom box body.

[0014] Optionally, a first annular flange is further provided on the outer wall of the top box body, and a second annular flange is provided on the outer wall of the bottom box body. The top box body is mounted on the bottom box body through the mutually connected first annular flange and the second annular flange.

[0015] Another embodiment of the present invention further provides a refueling water storage tank built in the containment of a nuclear power plant, including a water pool, a water pump, a support plate, and the above-mentioned retention basket; the support plate is arranged above the water pool, the retention box is installed in the water pool, and the water outlet hole communicates with the water pool; the inlet of the water pump communicates with the water pool, and the outlet of the water pump communicates with the water inlet hole.

[0016] In the present invention, water flows into the first inner space through the water inlet hole, and the water flow falls onto the buffer film of the buffer plate. The buffer film has a buffering effect on the water flow, and the water flow on the buffer film flows into the lower buffer plate through the first through hole thereon. The water flow passes through the lowermost buffer plate and flows into the second inner space, and the water flow in the second inner space flows out through the water outlet hole. The multiple buffer plates have a multiple buffering effect on the water flow, so that the impact force of the water flow flowing out from the water outlet hole is small. In addition, the first through hole on the buffer plate and the water outlet hole on the retention box both have a filtering effect, ensuring the filtering effect of the retention box on the water flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the drawings and embodiments.

[0018] Figure 1 is a schematic structural diagram of a retention basket provided by an embodiment of the present invention;

[0019] Figure 2 is a perspective sectional view of a retention basket provided by an embodiment of the present utility model;

[0020] Figure 3 is an exploded structural schematic diagram of a retention basket provided by an embodiment of the present utility model;

[0021] Figure 4 is a structural schematic diagram of the bottom box body of a retention basket provided by an embodiment of the present utility model;

[0022] Figure 5 is a structural schematic diagram of the buffer plate of a retention basket provided by an embodiment of the present utility model;

[0023] Figure 6 is a structural schematic diagram of the flow guide member of a retention basket provided by an embodiment of the present utility model;

[0024] Figure 7 is a structural schematic diagram of a refueling water storage tank built in the containment of a nuclear power plant provided by an embodiment of the present utility model.

[0025] The reference numerals in the specification are as follows:

[0026] 1, retention box; 11, first internal space; 12, second internal space; 13, water inlet hole; 14, water outlet hole; 15, annular support plate; 16, bottom box body; 161, first annular flange; 17, top box body; 171, second annular flange; 18, drawer slot; 2, buffer plate; 21, support frame; 22, buffer film; 23, first through hole; 24, handle; 3, flow guide member; 31, top frame; 32, bottom frame; 33, side plate; 34, second through hole; 35, third internal space; 4, water pool; 5, support plate. Detailed implementation manners

[0027] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0028] It should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "middle", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0029] Such as Figures 1 to 3 And Figure 5As shown in the figure, a retention basket provided by an embodiment of the present utility model includes a retention box 1 and a plurality of buffer plates 2; a first internal space 11, a second internal space 12 and a water inlet hole 13 are provided on the retention box 1, and the first internal space 11 communicates with the water inlet hole 13 and the second internal space 12; a plurality of water outlet holes 14 communicating with the second internal space 12 are provided on the side wall and the bottom wall of the retention box 1; it can be understood that the water inlet hole 13 is located above the first internal space 11, the first internal space 11 is located above the second internal space 12, and the bottom wall and the side wall of the second internal space 12 are covered with the water outlet holes 14.

[0030] The buffer plates 2 are installed at intervals in the first internal space 11; the buffer plate 2 includes a support frame 21 and a buffer film 22 installed on the support frame 21, and a plurality of first through holes 23 are provided on the buffer film 22. It can be understood that the support frame 21 is made of a rigid material, the buffer film 22 also has sufficient strength, the buffer film 22 is installed inside the support frame 21, and the buffer film 22 is covered with the first through holes 23.

[0031] In the present utility model, water flows through the water inlet hole 13 into the first internal space 11, the water flow falls on the buffer film 22 of the buffer plate 2, the buffer film 22 has a buffering effect on the water flow, and the water flow on the buffer film 22 flows through the first through holes 23 thereon onto the buffer plate 2 below, the water flow passes through the lowermost buffer plate 2 and flows into the second internal space 12, and the water flow in the second internal space 12 flows out through the water outlet holes 14. The plurality of buffer plates 2 have a multiple buffering effect on the water flow, so that the impact force of the water flow flowing out of the water outlet holes 14 is small. In addition, the first through holes 23 on the buffer plate 2 and the water outlet holes 14 on the retention box 1 both have a filtering effect, ensuring the filtering effect of the retention box 1 on the water flow.

[0032] In one embodiment, as Figure 2 and Figure 3 shown, the retention basket further includes a flow guide member 3 installed in the first internal space 11, and the flow guide member 3 is used to guide the water flowing in from the water inlet hole 13 to the buffer plate 2; it can be understood that the flow guide member 3 is located below the water inlet hole 13 and above the buffer plate 2.

[0033] As Figure 6As shown, the flow guide member 3 includes a top frame 31, a bottom frame 32, and a plurality of side plates 33 connected in sequence. Opposite ends of the side plates 33 are respectively connected to the top frame 31 and the bottom frame 32, and a third internal space 35 communicating with the first internal space 11 is surrounded by the plurality of side plates 33; a plurality of second through holes 34 communicating the first internal space 11 and the third internal space 35 are provided on the side plates 33. It can be understood that the top frame 31, the bottom frame 32, and the side plates 33 are integrally formed, and the number of the side plates 33 can be set according to actual needs; the side plates 33 are covered with the second through holes 34, and the flow guide member 3 is a hollow structural member. In a specific embodiment, 4 side plates 33 are provided, and the sides of the 4 side plates 33 are connected in sequence.

[0034] Specifically, water flow first enters the top frame 31 through the water inlet, and flows along the side plates 33. During the process of the water flow flowing along the side plates 33, it will flow into the third internal space 35 through the second through holes 34, and the water flow in the third internal space 35 will fall onto the buffer plate 2. In this embodiment, the flow guide member 3 can evenly guide the water flow to the buffer film 22, avoiding accidents of damaging the buffer film 22 due to excessive local water flow. In addition, the flow guide member 3 can play a first-stage buffering role on the water flow, avoiding the water flow flowing in through the water inlet hole 13 from directly impacting the buffer film 22, and prolonging the service life of the buffer plate 2.

[0035] Further explained, as Figure 6 shown, the side plates 33 are inclined and arranged between the top frame 31 and the bottom frame 32.

[0036] In an embodiment, as Figure 2 and Figure 4 shown, an annular support plate 15 is provided on the inner wall of the first internal space 11, and the bottom frame 32 is installed on the annular support plate 15. It can be understood that the annular support plate 15 and the retention box 1 are integrally formed, and the annular support plate 15 protrudes towards the middle of the first internal space 11. In a specific embodiment, a first mounting hole is provided on the annular support plate 15, a second mounting hole is provided on the bottom frame 32, and the bottom frame 32 is installed on the annular support plate 15 through a fixing member (such as a bolt, a screw, etc.) inserted into the first mounting hole and the second mounting hole.

[0037] In one embodiment, the buffer plate 2 further includes a reinforcing plate (not shown in the figure) mounted on the support frame 21, and the reinforcing plate is connected to the buffer film 22. Understandably, the reinforcing plate is disposed above the buffer film 22, and the reinforcing plate and the buffer film 22 can be connected by a string. In this embodiment, the reinforcing plate can support the buffer film 22, extending the service life of the buffer plate 2.

[0038] In one embodiment, as Figure 1 and Figure 3 shown, the retention box 1 further has a plurality of drawer slots 18 spaced apart from each other, and the support frame 21 is detachably mounted in the drawer slots 18. Understandably, the opening of the drawer slot 18 is located on the side wall of the retention box 1, and a groove is provided on the inner wall of the first inner space 11. When the buffer plate 2 is mounted in the drawer slot 18, the support frame 21 is located in the groove, thus ensuring the stability of the buffer plate 2 mounted in the drawer slot 18. In this embodiment, the buffer plate 2 is detachably mounted in the drawer slot 18, facilitating the disassembly and assembly between the buffer plate 2 and the retention box 1, and further improving the convenience of tilting the buffer plate 2.

[0039] In one embodiment, as Figure 1 and Figure 5 shown, the buffer plate 2 further includes a handle 24 mounted on the support frame 21. Understandably, the user can remove the buffer plate 2 from the drawer slot 18 through the handle 24, further improving the convenience of removing the buffer plate 2 from the retention box 1.

[0040] In one embodiment, as Figures 1 to 3 shown, the retention box 1 includes a bottom box body 16 and a top box body 17 detachably mounted on the bottom box body 16. The water inlet hole 13 is provided on the top box body 17, the second inner space 12 and the water outlet hole 14 are both provided on the bottom box body 16, and the first inner space 11 is provided between the top box body 17 and the bottom box body 16. Understandably, the top box body 17 and the bottom box body 16 can be detachably connected by fixing members such as screws and bolts.

[0041] In this embodiment, the detachable connection between the top box body 17 and the bottom box body 16 facilitates the disassembly and assembly of the flow guiding member 3 and the cleaning of the retention box 1.

[0042] In one embodiment, as Figure 3As shown, a first annular flange 161 is further provided on the outer wall of the top box body 17, and a second annular flange 171 is provided on the outer wall of the bottom box body 16. The top box body 17 is mounted on the bottom box body 16 through the interconnected first annular flange 161 and the second annular flange 171. In a specific embodiment, a third mounting hole is provided on the first annular flange 161, and a fourth mounting hole is provided on the second annular flange 171. The first annular flange 161 is detachably mounted on the second annular flange 171 through a fixing member (such as a screw or a bolt) inserted into the third mounting hole and the fourth mounting hole. In this embodiment, the design of the first annular flange 161 and the second annular flange 171 improves the convenience of disassembly and assembly between the top box body 17 and the bottom box body 16.

[0043] As Figure 7 shown, another embodiment of the present invention further provides a refueling water tank built in a nuclear power plant containment, which includes a water pool 4, a water pump (not shown in the figure), a support plate 5, and the above-mentioned retention basket; the support plate 5 is arranged above the water pool 4, the retention box 1 is installed in the water pool 4, and the water outlet hole 14 communicates with the water pool 4; the inlet of the water pump communicates with the water pool 4, and the outlet of the water pump communicates with the water inlet hole 13.

[0044] Specifically, when a break accident occurs in the nuclear power plant containment, water bodies such as spray water in the containment flow back into the water pool 4. The water pump extracts the water in the water pool 4 and inputs it into the first internal space 11 through the water inlet, and the water flow falls on the buffer film 22 of the buffer plate 2. The buffer film 22 has a buffering effect on the water flow, and the water flow on the buffer film 22 flows through the first through hole 23 thereon and flows onto the lower buffer plate 2. The water flow passes through the lowermost buffer plate 2 and flows into the second internal space 12. The water flow in the second internal space 12 flows back into the water pool 4 through the water outlet hole 14. The retention basket has a multiple buffering effect and a multiple filtering effect on the water flow, ensuring the cleanliness of the water flowing back into the water pool 4 and slowing down the impact force of the water flowing back into the water pool 4. The refueling water tank built in the nuclear power plant containment operates stably and has high safety.

[0045] The above are only embodiments of the retention basket and the refueling water tank built in the nuclear power plant containment of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A retention basket, characterized in that, It includes a retention box and a plurality of buffer plates; the retention box is provided with a first internal space, a second internal space and a water inlet hole, and the first internal space communicates with the water inlet hole and the second internal space; a plurality of water outlet holes communicating with the second internal space are provided on the side wall and the bottom wall of the retention box. The buffer plates are installed at intervals in the first internal space; each buffer plate includes a support frame and a buffer film installed on the support frame, and a plurality of first through holes are provided on the buffer film.

2. The retention basket according to claim 1, characterized in that, The retention basket further includes a flow guide member installed in the first internal space, and the flow guide member is used to guide the water flowing in from the water inlet hole to the buffer plates. The flow guide member includes a top frame, a bottom frame and a plurality of side plates connected in sequence. The opposite ends of each side plate are respectively connected to the top frame and the bottom frame, and a third internal space communicating with the first internal space is surrounded by the plurality of side plates; a plurality of second through holes communicating with the first internal space and the third internal space are provided on the side plates.

3. The retention basket according to claim 2, characterized in that, An annular support plate is provided on the inner wall of the first internal space, and the bottom frame is installed on the annular support plate.

4. The retention basket according to claim 1, characterized in that, Each buffer plate further includes a reinforcing plate installed on the support frame, and the reinforcing plate is connected to the buffer film.

5. The retention basket according to claim 1, wherein, A plurality of drawer slots are separately provided at intervals on the retention box, and the support frame is detachably installed in the drawer slots.

6. The retention basket according to claim 1, characterized in that, Each buffer plate further includes a handle installed on the support frame.

7. The retention basket according to claim 1, characterized in that, The retention box includes a bottom box body and a top box body detachably installed on the bottom box body. The water inlet hole is provided on the top box body, the second internal space and the water outlet holes are provided on the bottom box body, and the first internal space is provided between the top box body and the bottom box body.

8. The retention basket according to claim 7, wherein, A first annular flange is further provided on the outer wall of the top box body, and a second annular flange is provided on the outer wall of the bottom box body. The top box body is installed on the bottom box body through the mutually connected first annular flange and the second annular flange.

9. A refueling water storage tank built inside the containment of a nuclear power plant, characterized in that, It includes a water pool, a water pump, a support plate and the retention basket according to any one of claims 1 to 8; the support plate is arranged above the water pool, the retention box is installed in the water pool, and the water outlet holes communicate with the water pool; the inlet of the water pump communicates with the water pool, and the outlet of the water pump communicates with the water inlet hole.

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