Lead-bismuth reactor capable of removing Po

Abstract

The invention discloses a lead-bismuth reactor capable of removing Po, and relates to the technical field of nuclear application, and the lead-bismuth reactor comprises a reactor which is a lead-bismuth reactor taking lead-bismuth liquid as a coolant; the lead and bismuth replacement system is communicated with the reactor, and the lead and bismuth replacement system is used for conveying lead and bismuth liquid into the reactor and replacing the lead and bismuth liquid in the reactor at the same time; and the gas system is communicated with the reactor and the lead bismuth replacement system. Through the technical means of lead and bismuth replacement, the removal of lead and bismuth liquid Po in the reactor is realized, and meanwhile, the reactor does not need to deploy equipment such as a Po complementing and collecting system, a discharge promoting system and the like, so that the deployment space is saved.

Description

Technical Field

[0001] The invention relates to the field of nuclear application technology, in particular to a lead-bismuth reactor capable of removing Po. Background Art

[0002] The lead-bismuth reactor uses liquid lead-bismuth as coolant, which has the advantages of high safety, high heat transfer efficiency, and long refueling cycle. However, the lead-bismuth liquid in the reactor is irradiated by neutrons in the core during operation, producing volatile radioactive substances. 210 Po (Polonium). There are two ways to refuel a lead-bismuth reactor. One is to place a sealed, mechanically movable plug on the top cover, and cooperate with other mechanical parts to transfer the nuclear fuel inside the reactor and then move it out of the reactor through the small hole. The other is to open the top cover of the reactor and directly operate the nuclear fuel with external mechanical parts. Compared with reactors with plug-type refueling, reactors that open the cover to refuel have the advantages of small reactor size and space and relatively simple technology. However, after the cover of the lead-bismuth reactor is opened, the Po in the reactor will be released into the external environment atmosphere, causing radioactive contamination in the main reactor building. Therefore, before the lead-bismuth reactor is opened to refuel, Po needs to be removed to prevent the radioactivity in the main reactor building from exceeding the standard during the refueling process. In the current existing technology, Po is exported to the covering gas by injecting H2 or heating. Due to the large specific gravity of lead and bismuth, an additional lead-bismuth pump is required in the reactor to pump the lead and bismuth out of the reactor. In addition, Po needs to be adsorbed or captured by filtering or other methods. This reactor system for removing Po is complex and has high technical requirements. Moreover, the above method is generally operated online. The process of continuously exporting Po to the off-core system and equipment for processing will also increase the possibility of Po diffusion. If it is not operated online and is only operated before material replacement, there will be problems such as low efficiency and long time consumption. Summary of the invention

[0003] The purpose of the present invention is to solve the technical problem that Po must be removed before opening the cover of a lead-bismuth reactor for material replacement in the prior art, and provide a lead-bismuth reactor capable of removing Po, comprising:

[0004] A reactor, wherein the reactor is a lead-bismuth reactor using lead-bismuth liquid as a coolant.

[0005] A lead-bismuth replacement system is connected to the reactor and is used to transport lead-bismuth liquid into the reactor and replace the lead-bismuth liquid in the reactor at the same time; the lead-bismuth replacement system is used to replace the lead-bismuth liquid containing Po in the reactor.

[0006] A gas system is connected to the reactor and the lead-bismuth replacement system. The gas system is used to provide power to promote the flow of replacement liquid when the lead-bismuth replacement system performs lead-bismuth liquid replacement. At the same time, the gas system can also fill the reactor with gas.

[0007] The beneficial effects of the above technical solution are as follows: through the lead-bismuth replacement system, the lead-bismuth liquid containing Po in the reactor is replaced, and at the same time, the lead-bismuth liquid without Po is transported into the reactor, so that the Po content in the lead-bismuth is greatly reduced, and the staff and the environment in the plant are prevented from being contaminated by Po when the nuclear fuel of the core is replaced later. This design is simple and easy to operate. Compared with the existing technology, there is no need to heat the lead-bismuth liquid containing Po, nor is there any need to deploy and develop technologies and system equipment such as Po promotion and replenishment. Thanks to the half-life of Po of only 138 days, the replaced Po-containing lead-bismuth liquid will have a large amount of Po decayed by the time of the next material replacement (generally 3-7 years), which allows the replaced lead-bismuth liquid to be reused in the same system without the need to deploy a set for each material replacement. At the same time, due to the high specific gravity of lead and bismuth, the traditional method requires the installation of an additional pump in the reactor to push the lead and bismuth out of the reactor. The replacement method designed in this scheme adopts the air pressure provided by the gas system. The system is simple. The gas system only needs to arrange gas pipelines and does not take up space for arranging additional equipment on the reactor top cover, saving space and providing reserved space for the subsequent arrangement of other equipment on the reactor top.

[0008] Furthermore, the lead-bismuth replacement system includes a lead-bismuth input pipeline, a lead-bismuth discharge pipeline and at least two liquid storage tanks, wherein the outlet end of the lead-bismuth input pipeline is connected to the top of the reactor, and the inlet end of the lead-bismuth input pipeline is connected to the liquid storage tank; the inlet end of the lead-bismuth discharge pipeline is connected to the reactor, and the outlet end of the lead-bismuth discharge pipeline is connected to the liquid storage tank; the liquid storage tank is connected to the lead-bismuth input pipeline and the lead-bismuth discharge pipeline in parallel; a first control valve is provided at one end of the lead-bismuth input pipeline and the lead-bismuth discharge pipeline close to the reactor and at one end of each of the lead-bismuth input pipeline and the lead-bismuth discharge pipeline close to the liquid storage tank; wherein at least one of the liquid storage tanks is empty, and at least one is filled with lead-bismuth liquid.

[0009] Beneficial effects of the above technical solution: The present invention provides liquid storage tanks, at least one of which is an empty tank and at least one is filled with lead-bismuth liquid, provides pressure to the reactor through a gas system, transfers the lead-bismuth liquid containing Po in the reactor to an empty liquid storage tank, and, by controlling the gas system and combining the regulation of the control valve, simultaneously transfers the lead-bismuth liquid in the liquid storage tank filled with lead-bismuth liquid to the reactor to complete the replacement of the lead-bismuth liquid. At this time, the lead-bismuth liquid containing Po is transferred to the liquid storage tank, and the lead-bismuth liquid in the reactor is replaced with Po-free lead-bismuth liquid, thereby achieving simple, convenient and rapid removal of Po. The present invention, by designing a liquid storage tank, enables the lead-bismuth liquid to be recycled in the entire reactor system. At the same time, the Po replaced in the present invention decays naturally in the replacement system without special treatment. The entire system is simple and easy to operate, and saves space at the top of the reactor.

[0010] Preferably, there are three liquid storage tanks, one of which is initially empty, and the other two are filled with lead-bismuth liquid. Multiple replacements can reduce the residual amount of Po in the reactor, and preferably two replacements are performed so that the residual amount of Po in the reactor after the two replacements is less than 1% of the original Po.

[0011] The inlet end of the lead-bismuth discharge pipeline is connected to the top of the reactor and extends to the bottom of the reactor cavity. The inlet end of the lead-bismuth discharge pipeline extends into the reactor cavity and is arranged at the bottom of the reactor cavity, rather than being directly connected to the top of the reactor, which is conducive to eliminating the opening at the bottom of the reactor, the requirements for the sealing of the bottom of the reactor, and the difficulty of the construction process.

[0012] The lead-bismuth replacement system further includes a liquid outlet head, which is located above the interior of the reactor and is connected to the outlet end of the lead-bismuth input pipeline. The liquid outlet head is provided with a plurality of charging ports. The charging ports are evenly designed at the top of the reactor to increase the input area of ​​the lead-bismuth liquid. Preferably, the charging ports are evenly distributed.

[0013] The reactor is provided with a top cover on the top and a bottom plate at the bottom of the inner cavity. The bottom plate is located above the inlet end of the lead-bismuth discharge pipeline. The bottom plate divides the reactor into two interconnected spaces. The bottom is provided with a plurality of through holes. Preferably, two through holes are provided on the bottom plate, each of which is located in a space. With the above design, the top cover can be opened, and the nuclear fuel can be loaded and unloaded by removing all or part of the top cover. The bottom plate is used to add a partition space to the space in the reactor, so that when the reactor is working, a circulating pump is used to circulate the lead-bismuth liquid in the reactor. The additional through holes are located at the bottom of each partition space formed on the bottom plate, so that the lead-bismuth liquid separated by the bottom plate can flow into the bottom of the reactor through the through holes, so that when the lead-bismuth liquid is replaced, all the liquid in the reactor can be replaced.

[0014] The gas system includes a reactor pipeline and a replacement system pipeline, one end of the reactor pipeline is connected to the top of the reactor, and the other end is connected to the gas device; one end of the replacement system pipeline is connected to the lead-bismuth replacement system, and the other end is connected to the gas device; the reactor pipeline and the replacement system pipeline are both installed with a second control valve. The second control valve is used to regulate the reactor pipeline or the replacement system pipeline.

[0015] The replacement system pipeline includes several branches, each branch is connected to a corresponding liquid storage tank, the second control valve is installed on each branch, and the branches are all connected to the gas device.

[0016] The gas provided by the gas system is an inert gas or nitrogen.

[0017] The inert gas is argon.

[0018] The beneficial effect of the above technical solution is that the gas system is set up, and the gas system allows the lead-bismuth liquid to flow, thereby completing the replacement of the lead-bismuth liquid containing Po. The system is simple, and only the gas pipeline needs to be arranged, and no additional equipment is arranged on the top cover of the pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] In the figure: 1. Reactor, 2. Lead-Bi replacement system, 3. Gas system, 11. Top cover, 12. Partition, 13. Through hole, 21. Lead-Bi input pipeline, 22. Lead-Bi discharge pipeline, 23. Liquid storage tank, 24. First control valve, 25. Liquid outlet head, 26. Filling inlet, 31. Reactor pipeline, 32. Replacement system pipeline, 33. Second control valve, 34. Branch. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0024] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in the subsequent figures. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "upper", "lower", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use, or the orientation or position relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present invention and simplifying the description, and do 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", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0025] A lead-bismuth reactor capable of removing Po, comprising:

[0026] A reactor 1 is a lead-bismuth reactor 1 using lead-bismuth liquid as a coolant.

[0027] A lead-bismuth replacement system 2 is connected to the reactor 1 and is used to transport lead-bismuth liquid into the reactor 1 and replace the lead-bismuth liquid in the reactor 1; the lead-bismuth replacement system 2 is used to replace the lead-bismuth liquid containing Po in the reactor 1.

[0028] A gas system 3 is connected to the reactor 1 and the lead-bismuth replacement system 2. The gas system 3 is used to provide power to promote the flow of replacement liquid when the lead-bismuth replacement system 2 replaces the lead-bismuth liquid. At the same time, the gas system 3 can also fill the reactor 1 with gas.

[0029] Through the lead-bismuth replacement system 2, the lead-bismuth liquid containing Po in the reactor 1 is replaced, and the lead-bismuth liquid without Po is transported to the reactor 1, so that the subsequent staff can replace the nuclear fuel of the core without Po pollution. This design is simple and easy to operate. Compared with the prior art, there is no need to heat the lead-bismuth liquid containing Po in the reactor 1, and there is no need to deploy Po collection and promotion systems and equipment in the reactor 1 system. Because the half-life of Po is only 138 days, the replaced Po-containing lead-bismuth liquid will decay in large quantities during the next material change, which makes the replaced lead-bismuth liquid recycled in the same system. At the same time, the replacement method adopts the air pressure method provided by the gas system 3, the system is simple, and the gas system 3 only needs to arrange the gas pipeline, and does not occupy the additional equipment space on the reactor top cover 11, saving space, and providing reserved space for the subsequent arrangement of other equipment on the top of the reactor 1.

[0030] See also Figure 1The lead-bismuth replacement system 2 comprises a lead-bismuth input pipeline 21, a lead-bismuth discharge pipeline 22 and at least two liquid storage tanks 23, wherein the outlet end of the lead-bismuth input pipeline 21 is connected to the top of the reactor 1, and the inlet end of the lead-bismuth input pipeline 21 is connected to the liquid storage tank 23; the inlet end of the lead-bismuth discharge pipeline 22 is connected to the reactor 1, and the outlet end of the lead-bismuth discharge pipeline 22 is connected to the liquid storage tank 23; the liquid storage tank 23 is connected to the lead-bismuth input pipeline 21 and the lead-bismuth discharge pipeline 22 in parallel; a first control valve 24 is provided at one end of the lead-bismuth input pipeline 21 and the lead-bismuth discharge pipeline 22 close to the reactor 1, and at one end of each of the lead-bismuth input pipeline 21 and the lead-bismuth discharge pipeline 22 close to the liquid storage tank 23; wherein at least one of the liquid storage tanks 23 is empty, and at least one is filled with lead-bismuth liquid.

[0031] The present invention provides a liquid storage tank 23, at least one of which is an empty tank and at least one of which is filled with lead-bismuth liquid, and provides pressure to the reactor 1 through the gas system 3, so that the lead-bismuth liquid containing Po in the reactor 1 is transferred to the empty liquid storage tank 23, and the lead-bismuth liquid in the liquid storage tank 23 filled with lead-bismuth liquid is transferred and input into the reactor 1 by controlling the gas system 3 and combining the regulation of the control valve, so as to complete the replacement of the lead-bismuth liquid. At this time, the lead-bismuth liquid containing Po is transferred to the liquid storage tank 23, and the lead-bismuth liquid in the reactor 1 is replaced with the lead-bismuth liquid without Po, so as to achieve simple, convenient and rapid removal of Po. The present invention designs the liquid storage tank 23 so that the lead-bismuth liquid can be recycled in the entire reactor system. At the same time, the Po replaced in the present invention decays naturally in the replacement system without special treatment.

[0032] Preferably, the number of the liquid storage tanks 23 is three, one of which is initially empty, and the other two liquid storage tanks 23 are filled with lead-bismuth liquid. Multiple replacements can reduce the residual amount of Po in the reactor 1, and preferably two replacements are performed, so that the residual amount of Po in the reactor 1 after the two replacements is less than 1% compared with the original Po.

[0033] The inlet end of the lead-bismuth discharge pipeline 22 is connected to the top of the reactor 1 and extends to the bottom of the cavity of the reactor 1. The inlet end of the lead-bismuth discharge pipeline 22 extends into the cavity of the reactor 1 and is arranged at the bottom of the cavity of the reactor 1, rather than being directly connected to the top of the reactor 1, which is conducive to eliminating the opening at the bottom of the reactor 1, the requirements for the sealing of the bottom of the reactor 1, and the difficulty of the construction process.

[0034] The lead-bismuth replacement system 2 further includes a liquid outlet 25, which is located above the interior of the reactor 1 and is connected to the outlet end of the lead-bismuth input pipeline 21. The liquid outlet 25 is provided with a plurality of evenly distributed filling ports 26. The filling ports 26 are evenly designed at the top of the reactor 1 to increase the input area of ​​the lead-bismuth liquid.

[0035] The reactor 1 is provided with a top cover 11 on the top and a bottom plate at the bottom of the inner cavity. The bottom plate is located above the inlet end of the lead-bismuth discharge pipeline 22. The bottom plate divides the reactor 1 into two interconnected spaces. Two through holes 13 are provided on the bottom plate, and each through hole 13 is located in a space. Through the above design, the top cover 11 can be opened, and the staff can complete the nuclear fuel replacement of the core from the opened top cover 11; the bottom plate is used to add a partition space to the space in the reactor 1, so that the circulating pump can circulate the lead-bismuth liquid in the reactor 1 when the reactor 1 is working. The additional through hole 13 is located at the bottom of each partition space formed on the bottom plate, so that the lead-bismuth liquid separated by the bottom plate can flow into the bottom of the reactor 1 through the through hole 13, so that when the lead-bismuth liquid is replaced, all the liquid in the reactor 1 can be replaced.

[0036] The gas system 3 includes a reactor pipeline 31 and a replacement system pipeline 32. One end of the reactor pipeline 31 is connected to the top of the reactor 1, and the other end is connected to the gas device; one end of the replacement system pipeline 32 is connected to the lead-bismuth replacement system 2, and the other end is connected to the gas device; the reactor pipeline 31 and the replacement system pipeline 32 are both installed with a second control valve 33. The second control valve 33 is used to regulate the reactor pipeline 31 or the replacement system pipeline 32.

[0037] The replacement system pipeline 32 includes several branches 34, each branch 34 is connected to a corresponding liquid storage tank 23, the second control valve 33 is installed on each branch 34, and the branches 34 are all connected to the gas device.

[0038] The gas system 3 is an inert gas system 3, preferably an argon system.

[0039] By setting up the gas system 3, the gas system 3 allows the lead-bismuth liquid to flow, and the replacement of the lead-bismuth liquid containing Po is completed. The system is simple, and only the gas pipeline needs to be arranged, and no additional equipment is arranged on the stack top cover 11.

[0040] The working principle of the present invention is that when the reactor 1 is in operation, the gas system 3 and the lead-bismuth replacement system 2 stop working. When the nuclear fuel in the core of the reactor 1 needs to be replaced, the operation of the reactor 1 is stopped.

[0041] The second control valve 33 of the control reactor pipeline 31 and the second control valve 33 on the branch 34 connected to the empty liquid storage tank 23 are opened, the first control valve 24 of the lead-bismuth discharge pipeline 22 close to the reactor 1 is opened, the first control valve 24 of the lead-bismuth discharge pipeline 22 close to the empty liquid storage tank 23 is opened, the gas system 3 is started, and the reactor 1 is inflated. The air pressure forces the lead-bismuth liquid containing Po in the reactor 1 to flow in from the inlet end of the lead-bismuth discharge pipeline 22, and then flow into the empty liquid storage tank 23 through the lead-bismuth discharge pipeline 22. When the liquid level of the lead-bismuth liquid in the reactor 1 drops to the upper part of the core active area, the first control valve 24 on the lead-bismuth input pipeline 21 is opened, the first control valve 24 on the lead-bismuth discharge pipeline 22 close to any one of the lead-bismuth liquid storage tanks 23 and the first control valve 24 on the lead-bismuth input pipeline 21 close to the storage tank 23 are opened, and the second control valve 33 on the branch 34 connected to the storage tank 23 is opened; at this time, the storage tank 23 containing the lead-bismuth liquid is pressurized, and the lead-bismuth liquid is charged into the reactor 1 from the storage tank 23 through the lead-bismuth input pipeline 21 and the liquid outlet 25, if the reactor 1 contains the upper surface of the Po lead-bismuth liquid. The lead-bismuth liquid flows in from the top, flows out from the bottom through the lead-bismuth discharge pipeline 22 and is transferred to the empty storage tank 23, and the empty storage tank 23 is filled with the lead-bismuth liquid, and the lead-bismuth liquid replacement is completed. After the lead-bismuth replacement is completed, the first control valve 24 and the second control valve 33 are closed. In some embodiments, the lead-bismuth liquid needs to be replaced twice. After completing one replacement, the second control valve 33 corresponding to the lead-bismuth liquid storage tank 23 filled with Po-containing lead-bismuth liquid and the first control valve 24 on the lead-bismuth input pipeline 21 and the lead-bismuth discharge pipeline 22 are closed, and then the first control valve 24 on the lead-bismuth input pipeline 21 and the lead-bismuth discharge pipeline 22 corresponding to another lead-bismuth liquid storage tank 23 without Po and the second control valve 33 on the branch 34 are opened. Under the action of gas pressure, the lead-bismuth liquid in the storage tank 23 is input into the reactor 1 through the lead-bismuth input pipeline 21 and the liquid outlet 25 for a second replacement. The liquid in the reactor 1 flows into the new empty storage tank 23 after passing through the lead-bismuth discharge pipeline 22. After the replacement is completed, the lead-bismuth liquid in the liquid storage tank 23 is emptied, and the liquid storage tank 23 will be used as an empty liquid storage tank 23 for subsequent cyclic replacement. The original empty liquid storage tank 23 is filled with lead-bismuth liquid containing Po. After being vacant for no less than 138 days, Po decays naturally and can be used as lead-bismuth liquid without Po to replace the lead-bismuth liquid in the reactor 1 when the nuclear fuel in the core is replaced next time. Then close all the first control valves 24 and the second control valves 33. At this time, the lead-bismuth liquid in the reactor 1 no longer contains Po, and the staff opens the stack cover to replace the nuclear fuel in the core. Repeat the above process, and the reactor 1 realizes the recycling of circulating lead-bismuth liquid.In addition, since the refueling interval of the lead-bismuth reactor 1 is generally 3 to 7 years, compared with the natural decay period of Po which is only 138 days, if the decay efficiency of Po is not as good as required, the Po in the storage tank can be processed independently during the operation of the reactor 1. In this case, there is ample time, it is not an online processing technology, and the operation difficulty is low.

[0042] It should be noted that the volume capacity of the liquid storage tank 23 is greater than the total volume of the lead-bismuth liquid in the reactor 1 .

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A lead-bismuth reactor capable of removing Po, characterized in that: include: Reactor (1), a lead-bismuth replacement system (2), the lead-bismuth replacement system (2) being in communication with the reactor (1), and being used for conveying lead-bismuth liquid into the reactor (1) and replacing the lead-bismuth liquid in the reactor (1); A gas system (3), wherein the gas system (3) is connected to the reactor (1) and the lead-bismuth replacement system (2).

2. A lead-bismuth reactor capable of removing Po as claimed in claim 1, characterized in that: The lead-bismuth replacement system (2) comprises a lead-bismuth input pipeline (21), a lead-bismuth discharge pipeline (22) and at least two liquid storage tanks (23); the outlet end of the lead-bismuth input pipeline (21) is in communication with the top of the reactor (1), and the inlet end of the lead-bismuth input pipeline (21) is in communication with the liquid storage tank (23); the inlet end of the lead-bismuth discharge pipeline (22) is in communication with the reactor (1), and the outlet end of the lead-bismuth discharge pipeline (22) is in communication with the liquid storage tank (23); the liquid storage tank (23) is in communication with the lead-bismuth input pipeline (21) and the lead-bismuth discharge pipeline (22) in parallel; a first control valve (24) is provided at one end of the lead-bismuth input pipeline (21) and the lead-bismuth discharge pipeline (22) close to the reactor (1), and at one end of each of the lead-bismuth input pipeline (21) and the lead-bismuth discharge pipeline (22) close to the liquid storage tank (23); Wherein, at least one of the liquid storage tanks (23) is empty, and at least one is filled with lead-bismuth liquid.

3. A lead-bismuth reactor capable of removing Po as claimed in claim 2, characterized in that: The number of the liquid storage tanks (23) is three, one of which is initially empty, and the other two liquid storage tanks (23) are filled with lead-bismuth liquid.

4. A lead-bismuth reactor capable of removing Po as claimed in claim 2, characterized in that: The inlet end of the lead-bismuth discharge pipeline (22) is connected to the top of the reactor (1) and extends to the bottom of the reactor (1) cavity.

5. A lead-bismuth reactor capable of removing Po as claimed in claim 2, characterized in that: The lead-bismuth replacement system (2) further comprises a liquid outlet head (25), the liquid outlet head (25) being located above the interior of the reactor (1) and being connected to the outlet end of the lead-bismuth input pipeline (21), and the liquid outlet head (25) being provided with a plurality of filling ports (26).

6. A lead-bismuth reactor capable of removing Po as claimed in claim 1, characterized in that: The reactor (1) is provided with a top cover (11) on the top, and a partition (12) is provided in the inner cavity. The bottom of the partition (12) is provided with a plurality of through holes (13).

7. A lead-bismuth reactor capable of removing Po as claimed in claim 1, characterized in that: The gas system (3) comprises a reactor pipeline (31) and a replacement system pipeline (32); one end of the reactor pipeline (31) is connected to the top of the reactor (1), and the other end is connected to the gas device; one end of the replacement system pipeline (32) is connected to the lead-bismuth replacement system (2), and the other end is connected to the gas device; and a second control valve (33) is installed on both the reactor pipeline (31) and the replacement system pipeline (32).

8. A lead-bismuth reactor capable of removing Po as claimed in claim 7, characterized in that: The replacement system pipeline (32) comprises a plurality of branches (34), each branch (34) being connected to a corresponding liquid storage tank (23), each branch (34) being provided with the second control valve (33), and each branch (34) being connected to a gas device.

9. A lead-bismuth reactor capable of removing Po as claimed in claim 1, characterized in that: The gas provided by the gas system (3) is an inert gas or nitrogen.

10. A lead-bismuth reactor capable of removing Po as claimed in claim 9, characterized in that: The inert gas is argon.

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