Slag intercepting device and containment built-in refueling water tank

Abstract

The disintegrating slag intercepting device is used for being arranged on a water flow channel and comprises a device frame and a plurality of filtering assemblies, the filtering assemblies are located in the device frame, each filtering assembly comprises a first plate and a second plate which are arranged in the water flow direction at intervals, the disintegrating slag intercepting device further comprises a plurality of filtering cylinders, the two ends of each filtering cylinder are open, and a plurality of filtering holes are formed in the side wall of each filtering cylinder; the plurality of filter cartridges are arranged between the first plate and the second plate in an array state, two ends of each filter cartridge are respectively matched with the first plate and the second plate, a plurality of water inlets respectively corresponding to the end parts of the plurality of filter cartridges are formed in the first plate, the end parts of the filter cartridges are sealed at the matching parts of the second plate and the filter cartridges, and a water outlet is also formed in the second plate; water flow flows into the multiple filter cartridges from the multiple water inlets, the water flow is filtered through the filter holes, and the water flow flows out of the filter assembly from the water outlet.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear industry safety, and in particular to a slag interception device and a replacement water tank in a containment vessel. Background Art

[0002] When a high-energy pipeline rupture accident occurs in the containment of a nuclear power plant, the impact of the rupture medium will damage the surrounding insulation materials, paint and other materials, and will form a large amount of debris and transfer to the pit at the bottom of the containment or the internal refueling water tank. After the accident, the emergency core cooling system, containment spray system and other safety systems are put into operation. The safety system pump needs to take water from the internal refueling water tank at the bottom of the containment to provide water to the pressure vessel for emergency core cooling and to provide water to the containment spray ring pipe for cooling spray.

[0003] In order to ensure that the water quality meets the operating requirements of the safety system, an emergency core cooling system (ECCS) filter must be installed in the pit or in the internal refueling water tank to filter various types of debris to prevent the debris from entering the downstream, causing the fuel assembly in the pressure vessel, the nozzle on the containment spray ring pipe, etc. to be blocked, or affecting the normal operation of other equipment such as downstream pumps, valves, and heat exchangers. After being filtered, the debris will accumulate on the filter screen surface of the filter, resulting in an increase in the pressure drop resistance of water flowing through the filter, which may cause problems such as insufficient flow or cavitation in the safety system pump, affecting the safety of the nuclear power plant. Therefore, the ECCS filter needs a sufficiently large filter area to ensure that the pressure drop caused by the filter and the debris is less than the safety system limit requirements and does not affect the normal operation of the downstream safety system pump.

[0004] Prior art CN103028285B discloses a filter system for a replacement water tank in a containment, comprising a trash rack arranged above the holes of the upper floor of the replacement water tank, a trash retention basket arranged in the replacement water tank below the upper floor, and a filter arranged above the pump suction port. The trash rack, the trash retention basket, and the pump suction port filter form a three-stage filtration system.

[0005] Prior art CN203250543U discloses a device for intercepting and storing debris, and prior art CN217902733U also discloses a multi-layer retention basket for intercepting and storing debris, which is composed of a stainless steel filter assembly frame and a stainless steel porous plate, and is a box-like structure with an open top, a closed bottom, and filter screens around. The above device can initially intercept debris such as fibers and particles, and reduce the amount of debris reaching the filter screen of the downstream ECCS filter.

[0006] However, in actual engineering use, it was found that the debris interception device of the above patents has the following problems: 1) The device is large in size and regular in shape, and is generally required to be installed directly below the water inlet hole of the upper floor, which has high requirements for the spatial layout of the nuclear power plant. 2) The device generally adopts a flat filter structure with a small filter area, which is easily blocked by debris and loses its interception effect. 3) The device is a square basket structure with large mass and size, and the manufacturing and installation costs are relatively high.

[0007] In view of the above technical problems, the present invention is specially introduced. Summary of the invention

[0008] The main purpose of the present invention is to provide a debris interception device and a replacement material water tank in the containment, which are used to solve the problem of debris interception in the water flow channel upstream of the ECCS filter in a nuclear power plant.

[0009] In order to achieve the above object, according to one aspect of the present invention, a debris interception device is provided, which is used to be arranged on a water flow channel, and includes a device frame and a plurality of filter components, wherein the plurality of filter components are located in the device frame, and the filter components include a first plate and a second plate arranged at intervals along the water flow direction, and also include a plurality of filter cartridges, wherein both ends of the filter cartridges are open and a plurality of filter holes are provided on the side walls;

[0010] The plurality of filter cartridges are arranged in an array state between the first plate and the second plate, and the two ends of the filter cartridge are respectively matched with the first plate and the second plate, the first plate is provided with a plurality of water inlets corresponding to the end positions of the plurality of filter cartridges, the second plate and the filter cartridge are matched to seal the end of the filter cartridge, and the second plate is also provided with a water outlet;

[0011] Water flows into the multiple filter cartridges from the multiple water inlets, the filter holes filter the water debris, and the filtered water flows out of the filter assembly from the water outlet.

[0012] Furthermore, the filter assembly also includes a front panel, which is connected to the outer side of the first plate, and is provided with a plurality of panel holes corresponding to the positions of the plurality of water inlets.

[0013] Furthermore, the size of the water inlet matches the outer diameter of the filter cartridge, and the size of the panel hole is smaller than the inner diameter of the filter cartridge.

[0014] Furthermore, a plurality of positioning grooves are provided on the second plate, and the plurality of positioning grooves are respectively plugged and matched with the ends of the plurality of filter cartridges.

[0015] Furthermore, the filter assembly also includes a plurality of connecting beams, which connect the first plate and the second plate and are located on the circumferential outer side of the plurality of filter cartridges.

[0016] Furthermore, water may also flow out of the filter assembly from the gaps between adjacent connecting beams.

[0017] Furthermore, the first plate, the second plate and the plurality of connecting beams form an integrated structure to form a component frame of the filter assembly.

[0018] Furthermore, the plurality of filter cartridges are arranged between the first plate and the second plate in two or more array groups, and the plurality of water outlets are located between adjacent array groups.

[0019] Furthermore, there are more than two front panels, and the more than two front panels are respectively arranged corresponding to the more than two array groups.

[0020] Furthermore, a first fastener hole is provided on the front panel and the first plate, and the front panel is connected to the outer side of the first plate by a first fastener passing through the first fastener hole.

[0021] Furthermore, second fastener holes are provided on the first plate and the device frame, and the plurality of filter assemblies are connected to the device frame through second fasteners passing through the second fastener holes.

[0022] Furthermore, the debris intercepting device also includes an elastic sealing sheet, which is arranged between the device frame and the wall surface of the water flow channel, and the elastic sealing sheet contacts and seals with the wall surface of the water flow channel.

[0023] Furthermore, the slag intercepting device also includes a movable door, and the movable door is detachably fixed to the device frame through a door fixing assembly.

[0024] Furthermore, the debris intercepting device also includes a plurality of fixed supports, which are arranged at the bottom and both sides of the device frame and are used to be connected to the wall surface of the water flow channel.

[0025] In order to achieve the above-mentioned purpose, according to another aspect of the present invention, a replacement water tank in a containment is proposed, comprising an inner ring plate and an outer ring plate, an annular water channel is formed between the inner ring plate and the outer ring plate, and a plurality of slag interception devices according to the above-mentioned are arranged at intervals in the annular water channel.

[0026] By applying the technical solution of the present invention, at least the following beneficial effects are achieved:

[0027] 1. The debris interception device of the present invention is provided with a group of filter components. Compared with a flat filter, it can provide a larger filter area while occupying the same volume. The increased filter area can slow down the speed at which the filter is blocked by debris, so that the debris interception device can achieve better interception and retention effects.

[0028] 2. The debris interception device of the present invention makes the assembly of the filter cartridge in the filter assembly convenient and the structure stable by designing the size of the front panel and the panel holes. After the water flows into the filter cartridge, the debris is captured by the filter cartridge and is not easily carried away by the impact of the water flow and escapes, so that the filter assembly has a better debris retention effect.

[0029] 3. The debris interception device of the present invention is designed as a fence structure. Compared with the square basket structure, it has the advantages of simple structure, easy manufacturing and installation, and low economic cost. In addition, by designing an integrated component frame, the mechanical strength of the filter component can be effectively improved.

[0030] 4. The slag interception device of the present invention can conveniently achieve the interference seal between the device frame and the water channel wall and the ground by designing an elastic sealing sheet, avoiding repeated adjustments during the equipment installation process caused by manufacturing and civil engineering errors, thereby reducing the installation workload; and by designing a movable door, it is convenient for personnel and goods to enter and exit the nuclear power plant.

[0031] 5. The in-containment replacement water tank of the present invention realizes step-by-step interception of slag by sequentially connecting multiple slag interception devices in series in the annular waterway, thereby improving the retention effect of slag and reducing the amount of slag reaching the downstream ECCS filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0033] Figure 1 A schematic front view of a slag interception device according to an embodiment is shown;

[0034] Figure 2 A schematic diagram of a filter assembly according to an embodiment is shown;

[0035] Figure 3 A schematic diagram of the back side of a slag interception device according to an embodiment is shown;

[0036] Figure 4 A schematic diagram of a component framework of a filter component according to an embodiment is shown;

[0037] Figure 5 A schematic diagram of a filter cartridge according to an embodiment is shown;

[0038] Figure 6 A schematic diagram showing a slag interception device according to an embodiment of the present invention is provided in a water flow channel;

[0039] Figure 7 A cross-sectional view of a refueling water tank in a containment vessel according to one embodiment is shown.

[0040] The above drawings include the following reference numerals:

[0041] 1. Device frame; 2. Filter assembly; 21. First plate; 211. Water inlet; 212. Second fastener hole; 22. Second plate; 221. Water outlet; 222. Positioning groove; 23. Front panel; 231. Panel hole; 232. First fastener hole; 24. Connecting beam; 3. Filter cartridge; 31. Filter hole; 4. Elastic sealing sheet; 5. Movable door; 6. Door fixing assembly; 61. First door fixing piece; 62. Door bolt; 63. Second door fixing piece; 7. Fixed support; 8. Inner ring plate; 9. Outer ring plate; 10. Debris interception device; 11. Annular waterway. DETAILED DESCRIPTION

[0042] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] The present invention is further described in detail below in conjunction with specific embodiments, and these embodiments cannot be understood as limiting the scope of protection claimed by the present invention. The term "including" when used indicates the existence of a feature, but does not exclude the existence or addition of one or more other features; the orientation or position relationship indicated by the terms "lateral", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; in addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0044] In the description, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0045] Embodiment 1:

[0046] The present invention provides a debris interception device that can be arranged on a water flow channel. Figure 1 As shown, the debris interception device comprises a device frame 1 and a plurality of filter components 2, wherein the plurality of filter components 2 are installed in the device frame 1. The water flow passes through the plurality of filter components 2 to achieve filtering of the water flow and retention of debris.

[0047] Combination Figure 2 and Figure 3 As shown, the filter assembly 2 includes a first plate 21 and a second plate 22 spaced apart in the water flow direction, and also includes a plurality of filter cartridges 3. The plurality of filter cartridges 3 are arranged in an array between the first plate 21 and the second plate 22, and the two ends of the filter cartridges 3 are matched with the first plate 21 and the second plate 22, respectively.

[0048] like Figure 5 As shown, the filter cartridge 3 is open at both ends and has a plurality of densely arranged filter holes 31 on the side wall. Preferably, the filter cartridge 3 can be configured as a multi-layer structure to improve the filtering efficiency.

[0049] Combination Figure 3 and Figure 4 As shown, the first plate 21 is provided with a plurality of water inlets 211 corresponding to the end positions of the plurality of filter cartridges 3 , the second plate 22 seals the end of the filter cartridge 3 at the joint with the filter cartridge 3 , and the second plate 22 is also provided with a water outlet 221 .

[0050] In this way, water flows into the multiple filter cartridges 3 from the multiple water inlets 211, and the water debris is filtered through the filter holes 31, and the filtered water can flow out of the filter assembly 2 from the water outlet 221. The debris interception device of the present invention can provide a larger filter screen area while occupying the same volume compared to the flat filter screen by arranging the filter components in groups. The increased filter screen area can slow down the speed at which the filter screen is blocked by debris, so that the debris interception device can achieve better interception and retention effects.

[0051] like Figure 2 As shown, the filter assembly 2 further includes a front panel 23, which is connected to the outside of the first plate 21, and is provided with a plurality of panel holes 231 corresponding to the positions of the plurality of water inlets 211. The size of the water inlet 211 matches the outer diameter of the filter cartridge 3, so that the filter cartridge 3 can be installed in the filter assembly 2 through the water inlet 211.

[0052] A plurality of positioning grooves 222 are correspondingly provided on the second plate 22 , and the plurality of positioning grooves 222 are respectively plugged and matched with the ends of the plurality of filter cartridges 3 , so that each filter cartridge is accurately positioned in the filter assembly 2 .

[0053] Preferably, in the present embodiment, the filter cartridge 3 is in a cylindrical shape. In some other embodiments, the filter cartridge 3 may also be configured as a prismatic filter cartridge having a cross-sectional shape of a square, rectangle, regular hexagon, etc., and the shapes of the water inlet 211 and the positioning groove 222 are correspondingly adjusted to a square, rectangle, regular hexagon, etc., thereby achieving the same filtering and interception functions.

[0054] Furthermore, the size of the panel hole 231 is smaller than the inner diameter of the filter cartridge 3. The debris interception device of the present invention makes the assembly of the filter cartridge in the filter assembly convenient and the structure stable by designing the size of the front panel and the panel hole. After the water flow enters the filter cartridge, the debris is captured by the filter cartridge and is not easily carried by the water flow and escapes, so that the filter assembly has a better debris retention effect.

[0055] In addition, the filter assembly 2 further includes a plurality of connecting beams 24, which connect the first plate 21 and the second plate 22 and are located outside the circumference of the plurality of filter cartridges 3. Water can also flow out of the filter assembly 2 from the gaps between adjacent connecting beams 24.

[0056] Preferably, the first plate 21, the second plate 22 and the plurality of connecting beams 24 form an integrated structure to form a component frame of the filter assembly 2. The slag interception device of the present invention is designed as a fence structure, which has the advantages of simple structure, easy manufacturing and installation, and low economic cost compared to the square basket structure, and the integrated component frame can effectively improve the mechanical strength of the filter assembly.

[0057] Preferably, the plurality of filter cartridges 3 are arranged in two or more array groups between the first plate 21 and the second plate 22, and the plurality of water outlets 221 are located between adjacent array groups. There are two or more front panels 23, and the two or more front panels 23 are respectively arranged corresponding to the two or more array groups. In this embodiment, there are two array groups.

[0058] Combination Figure 2 and Figure 4 As shown, the front panel 23 and the first plate 21 are both provided with a first fastener hole 232, and the front panel 23 is connected to the outer side of the first plate 21 by passing the first fastener through the first fastener hole 232. Figure 1 As shown, the first plate 21 and the device frame 1 are both provided with second fastener holes 212 , and the plurality of filter assemblies 2 are connected to the device frame 1 through the second fasteners passing through the second fastener holes 212 .

[0059] Combination Figure 1 and Figure 6As shown, the slag interception device 10 further includes a plurality of fixed supports 7, which are arranged at the bottom and both sides of the device frame 1 and are used to connect with the wall surface of the water flow channel. Preferably, the fixed supports 7 can realize the fixed connection between the device frame 1 and the wall or the ground through anchor bolts, or can realize the fixed connection between the device frame 1 and the wall or the ground through welding with the existing embedded parts on the wall or the ground.

[0060] The debris interception device 10 also includes an elastic sealing sheet 4, which is arranged between the device frame 1 and the wall of the water flow channel, and the elastic sealing sheet 4 contacts and seals with the wall of the water flow channel. In this embodiment, elastic sealing sheets 4 are arranged on both sides of the device frame 1. Preferably, the elastic sealing sheet 4 can be made of a stainless steel sheet by bending, with a plurality of circular holes processed on the upper part, and can be fixed to the device frame 1 by fasteners.

[0061] By designing an elastic sealing sheet, even if there are errors in the device frame 1, the water channel size, etc., the interference seal between the device frame and the water channel wall and the ground can be easily achieved, avoiding repeated adjustments during the equipment installation process caused by manufacturing and civil engineering errors, thereby reducing the installation workload.

[0062] In addition, the slag interception device 10 further includes a movable door 5, which is detachably fixed to the device frame 1 through a door fixing assembly 6. Preferably, the door fixing assembly 6 includes a first door fixing member 61, a door bolt 62, and a second door fixing member 63. The device frame 1 is provided with a plurality of first door fixing members 61, and the movable door 5 is provided with a plurality of second door fixing members 63.

[0063] The first door fixing member 61 and the second door fixing member 63 both have corresponding round holes, and the bolt 62 is inserted to achieve relative fixation between the first door fixing member 61 and the second door fixing member 63, thereby closing the movable door 5. Pulling out the bolt 62 releases the relative fixation between the first door fixing member 61 and the second door fixing member 63, thereby opening the movable door 5. The movable door 5 of the slag intercepting device 10 provides a passage for people to enter and exit or for cargo transportation.

[0064] Preferably, the device frame 1 is formed by welding and assembling steel sections or square tubes, and the component frame of the filter component 2 is also made of stainless steel plates, so that the debris interception device has sufficient mechanical strength to withstand loads such as water flow impact and earthquakes.

[0065] Embodiment 2:

[0066] Combination Figure 6 and Figure 7As shown, this embodiment proposes a refueling water tank in a containment, comprising an inner ring plate 8 and an outer ring plate 9, an annular water channel 11 is formed between the inner ring plate 8 and the outer ring plate 9, and a plurality of slag interception devices according to the above embodiment 1 are arranged at intervals in the annular water channel 11. The annular water channel 11 is located upstream of the ECCS filter in the nuclear power plant.

[0067] Preferably, a plurality of debris interception devices 10 are arranged at intervals in the annular water channel 11, and the diameter of the filter hole 31 of the filter cartridge 3 of each debris interception device 10 can be reduced in sequence, thereby intercepting debris of sizes from large to small step by step, improving the retention effect of the debris, and reducing the amount of debris reaching the downstream ECCS filter.

[0068] Further preferably, the height of the debris interception device 10 is lower than the wall height of the annular waterway 11. When the filter assembly is completely blocked, the water flow can overflow to the downstream through the top of the debris interception device 10, and the water will not be unable to reach the downstream ECCS filter, thereby causing the ECCS filter to fail.

[0069] In summary, from the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0070] 1. The debris interception device of the present invention is provided with a group of filter components. Compared with a flat filter, it can provide a larger filter area while occupying the same volume. The increased filter area can slow down the speed at which the filter is blocked by debris, so that the debris interception device can achieve better interception and retention effects.

[0071] 2. The debris interception device of the present invention makes the assembly of the filter cartridge in the filter assembly convenient and the structure stable by designing the size of the front panel and the panel holes. After the water flows into the filter cartridge, the debris is captured by the filter cartridge and is not easily carried away by the impact of the water flow and escapes, so that the filter assembly has a better debris retention effect.

[0072] 3. The debris interception device of the present invention is designed as a fence structure. Compared with the square basket structure, it has the advantages of simple structure, easy manufacturing and installation, and low economic cost. In addition, by designing an integrated component frame, the mechanical strength of the filter component can be effectively improved.

[0073] 4. The slag interception device of the present invention can conveniently achieve the interference seal between the device frame and the water channel wall and the ground by designing an elastic sealing sheet, avoiding repeated adjustments during the equipment installation process caused by manufacturing and civil engineering errors, thereby reducing the installation workload; and by designing a movable door, it is convenient for personnel and goods to enter and exit the nuclear power plant.

[0074] 5. The in-containment replacement water tank of the present invention realizes step-by-step interception of slag by sequentially connecting multiple slag interception devices in series in the annular waterway, thereby improving the retention effect of slag and reducing the amount of slag reaching the downstream ECCS filter.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A debris interception device, used for being arranged on a water flow channel, comprising a device frame (1) and a plurality of filter components (2), wherein the plurality of filter components (2) are located in the device frame (1), characterized in that: The filter assembly (2) comprises a first plate (21) and a second plate (22) arranged at intervals along the water flow direction, and also comprises a plurality of filter cartridges (3), wherein both ends of the filter cartridges (3) are open and a plurality of filter holes (31) are provided on the side walls; The plurality of filter cartridges (3) are arranged in an array state between the first plate (21) and the second plate (22), and the two ends of the filter cartridge (3) are respectively matched with the first plate (21) and the second plate (22), the first plate (21) is provided with a plurality of water inlets (211) respectively corresponding to the end positions of the plurality of filter cartridges (3), the second plate (22) and the filter cartridge (3) are matched to close the end of the filter cartridge (3), and the second plate (22) is also provided with a water outlet (221); Water flows from the multiple water inlets (211) into the multiple filter cartridges (3), the filter holes (31) filter the water debris, and the filtered water flows out of the filter assembly (2) from the water outlet (221).

2. The slag interception device according to claim 1, characterized in that: The filter assembly (2) further comprises a front panel (23), wherein the front panel (23) is connected to the outer side of the first plate (21), and the front panel (23) is provided with a plurality of panel holes (231) corresponding to the positions of the plurality of water inlets (211).

3. The slag interception device according to claim 2, characterized in that: The size of the water inlet (211) matches the outer diameter of the filter cartridge (3), and the size of the panel hole (231) is smaller than the inner diameter of the filter cartridge (3).

4. The slag interception device according to claim 3, characterized in that: The second plate (22) is provided with a plurality of positioning grooves (222), and the plurality of positioning grooves (222) are respectively plugged into and matched with the ends of the plurality of filter cartridges (3).

5. The slag interception device according to any one of claims 1 to 4, characterized in that: The filter assembly (2) further comprises a plurality of connecting beams (24), wherein the plurality of connecting beams (24) connect the first plate (21) and the second plate (22) and are located on the circumferential outer side of the plurality of filter cartridges (3).

6. The slag interception device according to claim 5, characterized in that: Water can also flow out of the filter assembly (2) from the gaps between adjacent connecting beams (24).

7. The slag interception device according to claim 5, characterized in that: The first plate (21), the second plate (22) and the plurality of connecting beams (24) form an integrated structure to form a component frame of the filter component (2).

8. The slag interception device according to claim 2, characterized in that: The plurality of filter cartridges (3) are arranged between the first plate (21) and the second plate (22) in two or more array groups, and the plurality of water outlets (221) are located between adjacent array groups.

9. The slag intercepting device according to claim 8, characterized in that: There are more than two front panels (23), and the more than two front panels (23) are respectively arranged corresponding to the more than two array groups.

10. The slag intercepting device according to claim 9, characterized in that: The front panel (23) and the first plate (21) are provided with a first fastener hole (232), and the front panel (23) is connected to the outer side of the first plate (21) by a first fastener passing through the first fastener hole (232).

11. The slag intercepting device according to claim 1, characterized in that: The first plate (21) and the device frame (1) are provided with second fastener holes (212), and the plurality of filter assemblies (2) are connected to the device frame (1) via second fasteners passing through the second fastener holes (212).

12. The slag intercepting device according to claim 1, characterized in that: The debris interception device (10) further comprises an elastic sealing sheet (4), wherein the elastic sealing sheet (4) is arranged between the device frame (1) and the wall surface of the water flow channel, and the elastic sealing sheet (4) contacts and seals with the wall surface of the water flow channel.

13. The slag intercepting device according to claim 1, characterized in that: The slag interception device (10) further comprises a movable door (5), wherein the movable door (5) is detachably fixed to the device frame (1) via a door fixing assembly (6).

14. The slag intercepting device according to claim 1, characterized in that: The slag interception device (10) further comprises a plurality of fixed supports (7), which are arranged at the bottom and both sides of the device frame (1) and are used to be connected to the wall surface of the water flow channel.

15. A refueling water tank in a containment vessel, comprising an inner ring plate (8) and an outer ring plate (9), wherein an annular water channel (11) is formed between the inner ring plate (8) and the outer ring plate (9), characterized in that: A plurality of slag interception devices (10) according to any one of claims 1 to 14 are arranged at intervals in the annular water channel (11).

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