Reactor with water replenishing function

Abstract

The invention provides a reactor with a water replenishing function, the reactor comprises a pressure vessel cylinder, a pressure vessel top cover and a reactor internal, the reactor internal is arranged in the pressure vessel cylinder, and a reactor core is arranged in the reactor internal; a partition plate is arranged at the top of the reactor internals, an accommodating cavity is formed between the upper part of the partition plate and the top cover of the pressure vessel, at least one mounting hole is formed in the partition plate, and the lower part of the mounting hole is communicated with the reactor core through a communication runner; at least one circulation hole is formed in the partition plate or the reactor internals, an inlet connecting pipe is arranged on the pressure vessel barrel, the circulation hole is communicated with the inlet connecting pipe, at least part of a coolant of the inlet connecting pipe flows into the containing cavity through the circulation hole, and the coolant collected in the containing cavity is used for being led to the reactor core through the communicating flow channel when a reactor core accident occurs. According to the reactor, the accommodating cavity for storing the coolant is formed above the partition plate, the coolant flowing in through the inlet connecting pipe is partially led into the accommodating cavity, and the coolant in the accommodating cavity can play a role in replenishing water to the reactor core when water needs to be replenished in a serious accident of the reactor core.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear reactors, and in particular to a reactor with a water replenishment function. Background Art

[0002] A nuclear reactor is a device that starts, controls and maintains a nuclear fission or fusion chain reaction. Nuclear reactors have many uses, the most important of which is to generate heat energy, which can be used to heat water to generate steam and generate electricity instead of other fuels.

[0003] A nuclear reactor mainly includes a core, internals and a reactor pressure vessel, wherein the core is arranged in the internals in the reactor pressure vessel.

[0004] When a serious accident occurs in the core, the core needs to be replenished with coolant. Traditional reactor types generally use a core water replenishment tank set outside the reactor pressure vessel to inject the coolant from the core water replenishment tank into the reactor pressure vessel through a pipeline under the action of gravity and pressure to replenish the core.

[0005] That is, the traditional solution requires additional core water supply tanks and related pipelines for water supply, which not only increases the cost by adding related equipment systems, but also the newly added water supply tanks and related pipelines are large in size and occupy the space of the nuclear power plant building.

[0006] Based on this, the inventor of the present application proposes a reactor with a water replenishment function in order to solve the above technical problems. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a reactor with a water replenishment function in order to overcome the defects of the prior art that the external water replenishment device in the core accident state is expensive and large in size and occupies too much space in the nuclear power plant.

[0008] The present invention solves the above technical problems through the following technical solutions:

[0009] The present invention provides a reactor with a water replenishment function, which is characterized by comprising:

[0010] A pressure vessel cylinder, a pressure vessel top cover and a stack internal component, wherein the stack internal component is arranged in the pressure vessel cylinder, and the stack core is arranged in the stack internal component;

[0011] A partition plate is provided on the top of the internal component, a receiving cavity is formed between the upper portion of the partition plate and the top cover of the pressure vessel, at least one mounting hole is provided on the partition plate, and the lower portion of the mounting hole is connected to the core through a connecting flow channel; wherein,

[0012] At least one flow hole is provided on the partition plate or the in-core component, and an inlet connecting pipe is provided on the pressure vessel cylinder. The flow hole is communicated with the inlet connecting pipe, and at least part of the coolant in the inlet connecting pipe flows into the accommodating cavity through the flow hole. The coolant collected in the accommodating cavity is used to be introduced to the core through the connecting flow channel in the event of a core accident.

[0013] According to an embodiment of the present invention, an accommodating annular cavity is formed between the outer side of the in-pile component and the cylinder of the pressure vessel, and the inlet connecting pipe and the flow hole are both in communication with the accommodating annular cavity.

[0014] According to an embodiment of the present invention, the communication channel is formed by a guide cylinder, one end of which is connected to the partition plate and communicates with the accommodating cavity through the mounting hole, and the other end of which is communicated with the core.

[0015] According to one embodiment of the present invention, a shroud is provided on the upper part of the internal component, one end of the guide tube is passed through the shroud, a plurality of through holes are opened on the shroud, and the through holes are communicated with the accommodating annular cavity;

[0016] The guide cylinder is provided with a plurality of matching holes located in the shroud, and the coolant introduced by the inlet pipe flows to the core through the accommodating annular cavity, the shroud and the matching holes.

[0017] According to one embodiment of the present invention, a plurality of rows of circulation units are evenly distributed in the circumferential direction of the circumferential tube, and each of the circulation units is provided with at least one through hole along the axial direction of the circumferential tube.

[0018] According to one embodiment of the present invention, the flow holes are unidirectional and the number is at least two, and at least two of the flow holes are evenly spaced along the circumference of the partition plate or the core component;

[0019] The number of the mounting holes is at least two, and at least two of the mounting holes are arranged at intervals.

[0020] According to one embodiment of the present invention, the partition plate is circumferentially sealed and connected to the top of the internal component;

[0021] The partition plate, the internal components and the pressure vessel top cover enclose the accommodating cavity.

[0022] According to an embodiment of the present invention, the flow holes are opened on the outer circumference of the stack internals.

[0023] According to one embodiment of the present invention, the partition plate is circumferentially sealed to the inner wall of the pressure vessel top cover, and the top of the partition plate and the pressure vessel top cover are enclosed to form the accommodating cavity;

[0024] The flow holes are opened on the partition plate.

[0025] According to an embodiment of the present invention, the top of the in-pile component is sealedly connected to the bottom of the partition plate to separate the interior of the in-pile component from the accommodating annular cavity.

[0026] According to one embodiment of the present invention, a throttling mechanism is provided in the accommodating annular cavity, and the throttling mechanism is respectively connected to the outer wall of the in-core component and the inner wall of the pressure vessel cylinder, and at least part of the coolant introduced through the inlet connecting pipe flows to the lower plate space of the core through the throttling mechanism.

[0027] According to an embodiment of the present invention, the communication channel is an in-pile measurement conduit of the in-pile component.

[0028] According to one embodiment of the present invention, along the axial direction of the cylinder of the pressure vessel, the flow hole is located above the mounting hole.

[0029] The positive and progressive effects of the present invention are:

[0030] The reactor with water replenishment function of the present invention is provided with a partition plate on the top of the internal component of the reactor, and a accommodating chamber for storing coolant is formed above the partition plate. Part of the coolant flowing in through the inlet pipe is led into the accommodating chamber. When a serious core accident requires water replenishment, the coolant in the accommodating chamber is led to the core through the guide tube due to the reduction of the pressure on the core side, thereby playing a role in replenishing the coolant.

[0031] The coolant introduced into the pressure vessel top cover can cool the pressure vessel top cover area when the reactor is operating normally, and the coolant stored in the accommodating cavity acts as a water tank, eliminating the external water supply tank of the traditional reactor, reducing the layout cost of the external water supply tank, and completely avoiding the adverse effects caused by the failure of the traditional external water supply tank and pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0033] Figure 1 This is a schematic diagram of the structure of a conventional reactor;

[0034] Figure 2 This is a schematic diagram of the overall structure of a reactor with a water replenishment function according to the present invention;

[0035] Figure 3 for Figure 2 A schematic diagram of the internal structure of an implementation method of a reactor part with a water replenishment function;

[0036] Figure 4 for Figure 2A schematic diagram of the internal structure of another embodiment of a reactor part with a water replenishment function;

[0037] Figure 5 for Figure 2 A schematic diagram of the internal structure of another embodiment of a reactor part with a water replenishment function.

[0038] 1. Pressure vessel cylinder; 11. Inlet pipe; 12. Accommodating ring cavity; 13. Throttling mechanism;

[0039] 2. Pressure vessel top cover;

[0040] 3. Internal components; 31. Core; 32. Circulation holes; 33. Guide tube; 331. Matching holes; 34. Shroud tube; 341. Through holes; 342. Circulation unit;

[0041] 4. partition plate; 41. accommodating cavity; 42. mounting hole;

[0042] 5. Water tank; 51. Pipeline. DETAILED DESCRIPTION

[0043] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0045] The present invention proposes a reactor with a water replenishment function, comprising a pressure vessel cylinder 1, a pressure vessel top cover 2 and an in-core component 3, wherein the in-core component 3 is arranged in the pressure vessel cylinder 1, and a core 31 is arranged in the in-core component 3; a partition plate 4 is provided on the top of the in-core component 3, and a containing cavity 41 is formed between the upper part of the partition plate 4 and the pressure vessel top cover 2, and at least one mounting hole 42 is provided on the partition plate 4, and the lower part of the mounting hole 42 is connected with the core 31 through a connecting flow channel; wherein, at least one flow hole 32 is provided on the partition plate 4 or the in-core component 3, and an inlet pipe 11 is provided on the pressure vessel cylinder 1, and the flow hole 32 is connected with the inlet pipe 11, and at least part of the coolant in the inlet pipe 11 flows into the containing cavity 41 through the flow hole 32, and the coolant collected in the containing cavity 41 is used to be led to the core 31 through the flow channel when an accident occurs in the core 31.

[0046] Specifically, the circulation channel can be formed by a guide tube 33, one end of which is connected to the partition plate 4 and communicates with the accommodating cavity 41 through the mounting hole 42, and the other end of which is communicated with the core 31. The following first takes the guide tube 33 as an example of the circulation channel for explanation.

[0047] Please refer to Figure 1 The water tank 5 of a conventional reactor is generally externally arranged, that is, the water tank 5 is arranged outside the reactor pressure vessel cylinder 1. When a serious accident occurs in the core 31, the external water tank 5 introduces the coolant into the core 31 through the pipe 51 for water replenishment. The conventional way of placing the water tank 5 externally, on the one hand, adds the water tank 5 and the pipe 51 to the reactor system, making the overall volume of the reactor system too large and occupying more space in the plant; on the other hand, there is also the risk of damage and failure of the external water replenishment tank 5 and the pipe 51.

[0048] Please refer to Figures 2 to 5 Based on this, the present invention sets a partition plate 4 inside the pressure vessel cylinder 1 and the pressure vessel top cover 2, forms a accommodating chamber 41 between the partition plate 4 and the pressure vessel top cover 2, and sets a flow hole 32 connected with the inlet pipe 11 on the partition plate 4 or the in-core component 3 to guide part of the coolant into the accommodating chamber 41.

[0049] In this way, the space on the top of the partition plate 4, that is, the accommodating chamber 41, is used as a water storage structure, which is consistent with the function of the external water tank 5, saves the cost of arranging the external water tank 5 and the pipeline 51, and does not increase the volume of the reactor.

[0050] It can be seen that the temperature of the coolant introduced through the inlet pipe 11 is relatively low, and the coolant with a relatively low temperature is introduced into the pressure vessel top cover 2, so that the area of ​​the pressure vessel top cover 2 can be cooled. In addition, when a serious accident occurs in the core 31, the core 31 lacks water, and the pressure on the side of the core 31 decreases. The coolant in the area of ​​the pressure vessel top cover 2 is introduced into the core 31 through the guide tube 33 under the action of pressure and its own gravity, so that the process of the serious accident of the core 31 can be alleviated.

[0051] That is, the area of ​​the pressure vessel top cover 2 realizes the function of the water tank 5, which not only saves the cost of the traditional external water tank 5, but also completely avoids the adverse effects caused by the failure of the external water tank 5 and the pipeline 51, while also taking into account the cooling of the reactor pressure vessel top cover 2.

[0052] Please refer to Figure 3 The outer side of the internal component 3 and the pressure vessel cylinder 1 enclose a containing annular cavity 12 , and the inlet pipe 11 and the flow hole 32 are both connected to the containing annular cavity 12 .

[0053] The accommodating annular cavity 12 can reduce the flow rate of the coolant flowing into the internals 3 through the inlet pipe 11, so that the flow rate of the coolant entering the internals 3 is more uniform.

[0054] Specifically, a shroud 34 is provided on the upper part of the in-core component 3, one end of the guide tube 33 is passed through the shroud 34, a plurality of through holes 341 are provided on the shroud 34, and the through holes 341 are connected with the accommodating annular cavity 12; a plurality of matching holes 331 located in the shroud 34 are provided on the guide tube 33, and the coolant introduced by the inlet pipe 11 flows to the core 31 through the accommodating annular cavity 12, the shroud 34 and the matching holes 331.

[0055] The shroud 34 is used to receive the coolant introduced through the inlet pipe 11 . The coolant entering the shroud 34 flows into the guide tube 33 through the matching hole 331 provided on the guide tube 33 , and flows to the core 31 through the guide tube 33 .

[0056] It can be seen that the through hole 341 of the present invention is exemplified by a circle, but the shape of the through hole 341 may also be a square, a triangle, a polygon or other shapes, which are not limited here.

[0057] Furthermore, a plurality of rows of flow units 342 are evenly distributed in the circumferential direction of the surrounding tube 34 , and each flow unit 342 is provided with at least one through hole 341 along the axial direction of the surrounding tube 34 .

[0058] The present invention arranges three through holes 341 in each row along the axial direction of the surrounding cylinder 34, and multiple rows of flow units 342 are evenly spaced around the circumference of the surrounding cylinder 34, so that the uniformity of the surrounding cylinder 34 receiving the coolant can be improved, and the coolant entering the surrounding cylinder 34 can be buffered in the surrounding cylinder 34, thereby improving the uniformity of the coolant flow received by the guide cylinder 33.

[0059] In the present invention, the number of the circulation units 342 can be four, six, eight, etc., which is not limited here.

[0060] In some other embodiments, the number of through holes 341 in each row of circulation units 342 may be one, two, or more, etc., which is not limited here and can be adjusted according to actual needs.

[0061] For the flow holes 32, the inner cross-section of the pressure vessel top cover 2 is spherical. To ensure the cooling uniformity of the pressure vessel top cover 2 area, the flow holes 32 are unidirectional and there are at least two of them, and at least two flow holes 32 are evenly spaced along the circumference of the partition plate 4 or the core 31 component.

[0062] The one-way flow hole 32 allows the coolant to flow to the accommodating cavity 41 through the accommodating annular cavity 12 , while blocking the direction from the accommodating cavity 41 to the accommodating annular cavity 12 .

[0063] For example, a one-way flow structure such as a one-way valve may be provided in the flow hole 32, or the cross-sectional shape of the flow hole 32 may be improved, for example, the cross-sectional shape of the flow hole 32 along the axial direction of the pressure vessel cylinder 1 may be set to be a cone. That is, the cross-sectional dimension of the flow hole 32 close to the accommodating annular cavity 12 is larger than the cross-sectional dimension of the side close to the accommodating cavity 41, so that the coolant can flow to the accommodating cavity 41 through the accommodating annular cavity 12, while the coolant in the accommodating cavity 41 is difficult to flow back.

[0064] In one embodiment, the number of the mounting holes 42 is also at least two, and at least two mounting holes 42 are arranged at intervals.

[0065] Furthermore, the diameter of the flow hole 32 is smaller than the diameter of the mounting hole 42 , so when the core 31 has an accident, most of the coolant in the accommodating cavity 41 will flow to the guide tube 33 through the mounting hole 42 and then be led to the core 31 through the guide tube 33 .

[0066] Furthermore, along the axial direction of the pressure vessel cylinder 1, the circulation hole 32 is above the mounting hole 42. Therefore, because the mounting hole 42 is located lower than the circulation hole 32, the pressure of the coolant at the mounting hole 42 is greater than that of the circulation hole 32, so that most of the coolant will flow through the mounting hole 42 and the circulation channel to the core 31.

[0067] The number of the flow holes 32 can be determined according to the actual flow rate restriction of the coolant entering the accommodating chamber 41 , and is not limited here.

[0068] The number of the mounting holes 42 corresponds to the number of the guide cylinders 33 , so a corresponding number of mounting holes 42 may be provided according to the actual number of the guide cylinders 33 .

[0069] Please refer to Figure 3 The partition plate 4 is sealed and connected to the top of the in-core component 3 in the circumferential direction; the partition plate 4, the in-core component 3 and the pressure vessel top cover 2 enclose a receiving cavity 41.

[0070] A partition plate 4 is installed on the top of the in-pile component 3 or the upper part of the circumferential tube 34. The partition plate 4 can be connected to the inner wall of the in-pile component 3 in the circumferential direction by welding, sealing ring sealing connection or slot sealing connection. The specific connection method is not limited here.

[0071] Optionally, the present invention takes the example of the circumferential welding of the partition plate 4 and the top inner wall of the shroud 34 as an example, and the partition plate 4, the shroud 34, and the pressure vessel top cover 2 enclose a receiving cavity 41. Moreover, the partition plate 4 can extend toward the inside of the shroud 34, so that the volume of the receiving cavity 41 can be expanded, thereby increasing the amount of water that can be replenished for the core 31.

[0072] A flow hole 32 is circumferentially opened on the outer circumference of the top of the surrounding cylinder 34 , and the flow hole 32 connects the accommodating annular cavity 12 and the accommodating cavity 41 along the axial direction of the pressure vessel cylinder 1 .

[0073] Please continue to refer to Figure 3 The coolant enters the containing annular cavity 12 through the inlet pipe 11, most of the coolant enters the shroud 34 through the through hole 341 set on the shroud 34, and flows to the core 31 through the guide tube 33, and a small amount of coolant flows upward through the flow hole 32 to reach the containing cavity 41 as the water tank 5.

[0074] When the reactor is in operation, a large amount of coolant is stored in the accommodating chamber 41 as a water tank 5. When a serious accident occurs in the core 31, the core 31 loses water, and the pressure on the side of the core 31 decreases. Under the action of pressure and its own gravity, the coolant in the accommodating chamber 41 at the top will flow to the guide cylinder 33 through the mounting hole 42, and then be led to the core 31 by the guide cylinder 33 for water replenishment.

[0075] The coolant in the accommodating cavity 41 can continuously provide coolant to the core 31 , thereby alleviating the process of a serious accident of the core 31 .

[0076] In some other embodiments, the partition plate 4 is circumferentially sealed to the inner wall of the pressure vessel top cover 2 , and the top of the partition plate 4 and the pressure vessel top cover 2 enclose a receiving cavity 41 ; the flow hole 32 is opened on the partition plate 4 .

[0077] That is, compared to installing the partition plate 4 to the in-pile component 3, in this embodiment, the partition plate 4 is not connected to the in-pile component 3, but is directly connected to the pressure vessel top cover 2 by welding or other methods such as a sealing ring, and a accommodating cavity 41 is enclosed between the partition plate 4 and the pressure vessel top cover 2.

[0078] Compared with connecting the partition plate 4 to the internal component 3, the volume of the accommodating cavity 41 in this embodiment is relatively small, and the installation requirements for the partition plate 4 are relatively low. Both settings of the partition plate 4 are acceptable, and the installation position and installation method of the partition plate 4 can be adjusted according to actual needs in actual application, which is not limited here.

[0079] Furthermore, the top of the in-pile component 3 is sealedly connected to the bottom of the partition plate 4 to separate the interior of the in-pile component 3 from the accommodating annular cavity 12 .

[0080] Optionally, the in-pile component 3 is circumferentially welded to the bottom of the partition plate 4 or sealed in other optional ways, thereby ensuring that the coolant in the accommodating annular cavity 12 can flow into the accommodating cavity 41 through the flow holes 32 .

[0081] In one embodiment, a throttling mechanism 13 is provided in the accommodating annular cavity 12 , and the throttling mechanism 13 is respectively connected to the outer wall of the in-core component 3 and the inner wall of the pressure vessel cylinder 1 , and at least part of the coolant introduced through the inlet pipe 11 flows to the lower plate space of the core 31 through the throttling mechanism 13 .

[0082] Because it is necessary to ensure that most of the coolant enters the shroud 34 rather than all of it reaches the lower plate space of the core 31 through the accommodating annular cavity 12 , a throttling mechanism 13 needs to be provided in the accommodating annular cavity 12 .

[0083] The throttling mechanism 13 is annular as a whole. The temperature of the coolant in the lower plate space of the core 31 is relatively high. In order to prevent the inner wall of the pressure vessel cylinder 1 from being heated to a temperature higher than the bearing value of the material, the coolant at least partially flows directly to the lower plate space of the core 31 through the throttling mechanism 13.

[0084] The flowing coolant can cool the inner wall of the pressure vessel cylinder 1, thereby reducing the requirements for the material of the pressure vessel cylinder 1 and saving costs.

[0085] Please continue to refer to Figures 3 to 5 As for the guide tube 33 , one end of the guide tube 33 is mounted to the partition plate 4 , and the other end extends to the core 31 .

[0086] The guide tube 33 can be directly connected to the partition plate 4 and the core 31, for example, Figure 3 . Figure 3 The coolant in the middle accommodating cavity 41 flows directly to the core 31 through the guide tube 33 .

[0087] In some other embodiments, the flow channel may also be a coolant flow channel, which is only connected between the partition plate 4 and the surrounding cylinder 34, for example, Figure 5 , Figure 5The flow channel in the figure is shown in the form of a straight tube, which only represents that a flow channel is set between the partition plate 4 and the shroud 34. As for the specific shape of the flow channel, it is only given as an example and is not limited. When a serious accident occurs in the core 31, the core 31 loses water and the pressure drops. Under the action of pressure and its own gravity, the coolant in the accommodating cavity 41 flows along the mounting hole 42 and the coolant flow channel, enters the shroud 34, and then flows downward into the core 31.

[0088] Optionally, the guide tube 33 can be an in-core measuring tube of the in-core component 3. When a serious accident occurs in the core 31, the core 31 loses water and the pressure drops. Under the pressure and its own action, the coolant in the accommodating cavity 41 leads the coolant to the core 31 along the in-core measuring tube of the in-core component 3.

[0089] In summary, in the reactor with a water replenishment function of the present invention, a partition plate 4 is arranged on the top of the internal component 3, and a storage chamber 41 for storing coolant is formed above the partition plate 4. Part of the coolant flowing in through the inlet connecting pipe 11 is led into the storage chamber 41. When the core 31 needs water replenishment due to a serious accident, the coolant in the storage chamber 41 is led to the core 31 through the guide tube 33 due to the pressure reduction on the side of the core 31, thereby playing a role in replenishing the coolant of the core 31.

[0090] The coolant introduced through the flow hole 32 can cool the area of ​​the pressure vessel top cover 2 when the reactor is operating normally, and the coolant stored in the accommodating cavity 41 acts as a water tank 5, eliminating the external water supply tank 5 of the traditional reactor, reducing the layout cost of the external water supply tank 5, and completely avoiding the adverse effects caused by the failure of the traditional external water supply tank 5 and the pipeline 51.

[0091] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "connect", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0092] The present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or multiple times in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0093] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A reactor with water replenishment function, characterized in that: include: A pressure vessel cylinder, a pressure vessel top cover and a stack internal component, wherein the stack internal component is arranged in the pressure vessel cylinder, and the stack core is arranged in the stack internal component; A partition plate is provided on the top of the internal component, a receiving cavity is formed between the upper portion of the partition plate and the top cover of the pressure vessel, at least one mounting hole is provided on the partition plate, and the lower portion of the mounting hole is connected to the core through a connecting flow channel; wherein, At least one flow hole is provided on the partition plate or the in-core component, and an inlet connecting pipe is provided on the pressure vessel cylinder. The flow hole is communicated with the inlet connecting pipe, and at least part of the coolant in the inlet connecting pipe flows into the accommodating cavity through the flow hole. The coolant collected in the accommodating cavity is used to be introduced to the core through the connecting flow channel in the event of a core accident.

2. The reactor with water replenishment function according to claim 1, characterized in that: An accommodating annular cavity is formed between the outer side of the internal component and the cylinder of the pressure vessel, and the inlet pipe and the flow hole are both in communication with the accommodating annular cavity.

3. The reactor with water replenishment function according to claim 1, characterized in that: The communication channel is formed by a guide cylinder, one end of which is connected to the partition plate and communicated with the accommodating cavity through the mounting hole, and the other end of which is communicated with the core.

4. The reactor with water replenishment function according to claim 3, characterized in that: A shroud is provided on the upper part of the internal component, one end of the guide tube is passed through the shroud, a plurality of through holes are opened on the shroud, and the through holes are communicated with the accommodating annular cavity; The guide cylinder is provided with a plurality of matching holes located in the shroud, and the coolant introduced by the inlet pipe flows to the core through the accommodating annular cavity, the shroud and the matching holes.

5. The reactor with water replenishment function according to claim 4, characterized in that: The circumferential direction of the circumferential tube is uniformly provided with a plurality of rows of flow units, and each of the flow units is provided with at least one through hole along the axial direction of the circumferential tube.

6. The reactor with water replenishment function according to claim 2, characterized in that: The flow holes are unidirectional and have at least two flow holes, and at least two flow holes are evenly spaced along the circumference of the partition plate or the core component; The number of the mounting holes is at least two, and at least two of the mounting holes are arranged at intervals.

7. The reactor with water replenishment function according to claim 2, characterized in that: The partition plate is circumferentially sealed and connected to the top of the internal component; The partition plate, the internal components and the pressure vessel top cover enclose the accommodating cavity.

8. The reactor with water replenishment function according to claim 7, characterized in that: The flow holes are opened on the outer circumference of the internal component.

9. The reactor with water replenishment function according to claim 2, characterized in that: The partition plate is sealed and connected to the inner wall of the pressure vessel top cover in the circumferential direction, and the top of the partition plate and the pressure vessel top cover are enclosed to form the accommodating cavity; The flow holes are opened on the partition plate.

10. The reactor with water replenishment function according to claim 9, characterized in that: The top of the internal component is sealed and connected to the bottom of the partition plate to separate the interior of the internal component from the accommodating annular cavity.

11. The reactor with water replenishment function according to any one of claims 1 to 10, characterized in that: A throttling mechanism is provided in the accommodating annular cavity, and the throttling mechanism is respectively connected to the outer wall of the in-core component and the inner wall of the pressure vessel cylinder. At least part of the coolant introduced through the inlet connecting pipe flows to the lower plate space of the core through the throttling mechanism.

12. The reactor with water replenishment function according to any one of claims 1 to 10, characterized in that: The communication channel is an in-pile measurement conduit of the in-pile component.

13. The reactor with water replenishment function according to any one of claims 1 to 10, characterized in that: Along the axial direction of the cylinder of the pressure vessel, the flow hole is located above the mounting hole.

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