Device suitable for removing activation product 210Po in lead-bismuth coolant of lead-bismuth cooled reactor and lead-bismuth cooled reactor

Abstract

The embodiment of the invention relates to the technical field of radioactive liquid treatment, in particular to a device suitable for removing an activated product 210Po in a lead-bismuth cooling agent of a lead-bismuth cooling reactor and the lead-bismuth cooling reactor. The removing device comprises a shell, a connecting piece and a 210Po removing piece. The shell is arranged to form a containing cavity, a liquid inlet allowing the lead-bismuth cooling agent to flow into the containing cavity is formed in the side face of the shell, and a liquid outlet allowing the lead-bismuth cooling agent to flow out of the containing cavity is formed in the bottom end of the shell. And the connecting piece is connected with the top end of the shell and is used for hanging the shell on a reactor top cover of the lead-bismuth cooling reactor. The 210Po removing part is used for removing 210Po in the lead-bismuth cooling agent entering the containing cavity. According to the embodiment of the invention, the removal device is arranged in the reactor, the lead-bismuth cooling agent can enter and exit from the accommodating cavity of the removal device by utilizing the circular flow of the lead-bismuth cooling agent in the reactor, so that < 210 > Po in the lead-bismuth cooling agent is removed, and the lead-bismuth cooling agent only circularly flows in the reactor container, so that the risk of leakage of the lead-bismuth cooling agent is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of treating radioactive liquids, and in particular to a method for removing activation products in lead-bismuth coolants of lead-bismuth cooled reactors. 210 Po device and lead-bismuth cooled reactor. Background Art

[0002] This section of content merely provides background information related to the present application and does not necessarily constitute prior art.

[0003] Lead-bismuth cooled reactors have become an important development direction for global energy supply due to their high energy density and good inherent safety. However, during the operation of the reactor, the lead-bismuth coolant 209 Bi reacts easily with neutrons to produce 210 Bi, 210 Bi will then decay through β to form 210 Po. 210 Po is an extremely toxic and volatile substance with a half-life of up to 138 days. 210 During the decay process, Po will release alpha particles, causing internal radiation, which will bring serious harm. In the event of an accident, the increase in the temperature of the gas covering the top of the reactor will also lead to 210 The release of Po increases, and there is a risk of exceeding international safety standards. With the increasing application of lead-bismuth cooled reactors, how to remove the lead-bismuth cooled reactors? 210 Po has become a problem that needs to be solved. Summary of the invention

[0004] A brief overview of the present application is provided below in order to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify the key or important parts of the present application, nor is it intended to limit the scope of the present application. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0005] In view of the above technical problems, the embodiments of the present application provide a method for removing the activation product in the lead-bismuth coolant of a lead-bismuth cooled reactor. 210 Po device and lead-bismuth cooled reactor.

[0006] In a first aspect, the embodiments of the present application provide a method for removing activation products in a lead-bismuth coolant of a lead-bismuth cooled reactor. 210 The device of Po may include a housing, a connecting piece and 210The shell is configured to form a receiving cavity, a liquid inlet for supplying the lead-bismuth coolant into the receiving cavity is formed on the side of the shell, a liquid outlet for supplying the lead-bismuth coolant out of the receiving cavity is formed at the bottom of the shell, and the liquid inlet is located below the lead-bismuth coolant liquid level in the stack container of the lead-bismuth cooled reactor. The connector is connected to the top of the shell and is used to suspend the shell on the stack top cover of the stack container of the lead-bismuth cooled reactor. 210 The Po removal piece is used to remove the lead-bismuth coolant entering the receiving cavity. 210 Po.

[0007] In the embodiment of the present application, since the shell of the removal device is suspended on the top cover of the lead-bismuth cooled reactor, and since the liquid inlet of the shell is located below the liquid level of the lead-bismuth coolant in the reactor container of the lead-bismuth cooled reactor, the lead-bismuth coolant circulates only inside the reactor container, thereby reducing the risk of lead-bismuth coolant leakage. 210 The Po removal device can utilize the circulation of the lead-bismuth coolant in the stack to realize the lead-bismuth coolant entering and exiting the receiving cavity of the removal device, thereby utilizing 210 Po remover removes lead and bismuth coolant in the receiving cavity 210 Po.

[0008] In the second aspect, an embodiment of the present application provides a lead-bismuth cooled reactor, which may include a reactor container, a core assembly, a heat exchanger, a flow distributor, a current collector, and a pump. The reactor container may include a container body with an opening formed at the top and a reactor top cover for closing the container body, and the container body is used to accommodate the lead-bismuth coolant. The core assembly is arranged in the container body. The heat exchanger is used to receive the lead-bismuth coolant from the core assembly and cool it. The flow distributor is arranged below the core assembly for supplying the lead-bismuth coolant into the core assembly. The current collector is arranged to form a collecting cavity, and the current collector is arranged radially outside the flow distributor for receiving the lead-bismuth coolant cooled by the heat exchanger. The pump is used to pump the lead-bismuth coolant in the current collector to the upper part of the container body, so that the lead-bismuth coolant from the current collector flows downward, and flows downward radially outside the current collector to the bottom of the current collector, and finally enters the flow distributor.

[0009] In a third aspect, an embodiment of the present application provides a lead-bismuth cooled reactor, which may include: a reactor container and an activation product in a lead-bismuth coolant suitable for removing the activation product in a lead-bismuth cooled reactor provided in the first aspect of the present application. 210 The stack container includes a container body with an opening formed on the top and a stack cover for closing the container body, the container body is used to contain the lead-bismuth coolant; the device is suspended from the stack cover, the liquid inlet of the device is located below the liquid level of the lead-bismuth coolant in the container body, and is used to remove the activation product in the lead-bismuth coolant 210 Po.

[0010] These and other advantages of the present application will become more apparent through the following detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to further illustrate the above and other advantages and features of the present application, the specific embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. The accompanying drawings together with the following detailed description are included in this specification and form a part of this specification. Elements with the same function and structure are represented by the same reference numerals. It should be understood that these drawings only describe typical examples of the present application and should not be regarded as limiting the scope of the present application.

[0012] Figure 1 It is an activation product suitable for removing the lead-bismuth coolant in the lead-bismuth cooled reactor according to one embodiment of the present application. 210 A schematic diagram of the structure of Po's device;

[0013] Figure 2 is a schematic diagram of a lead-bismuth cooled reactor according to an embodiment of the present application, wherein arrows indicate the flow direction of the lead-bismuth coolant, and dashed lines in the figure indicate the liquid level of the lead-bismuth coolant;

[0014] Figure 3 It's a lead-bismuth cooled reactor. 210 When Po is removed, the lead-bismuth coolant 210 The variation of saturation activity of Po with time;

[0015] Figure 4 Is a lead-bismuth cooled reactor in different 210 Po removal efficiency, lead-bismuth coolant 210 Changes in the activity of Po over time.

[0016] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding.

[0017] Description of reference numerals:

[0018] 10. Removal device; 11. Shell; 101. Accommodation chamber; 102. Liquid inlet; 103. Liquid outlet; 111. Pipe fitting; 112. End cover; 12. Connector; 13. 210 Po removal part; 131, removal shell part; 132, rod part; 133, filter material;

[0019] 20. Stack container; 21. Container body; 22. Stack top cover;

[0020] 30. Core assembly;

[0021] 40. heat exchanger; 41. heat exchange inlet; 42. heat exchange outlet; 43. heat exchanger shell;

[0022] 50. Flow distribution parts;

[0023] 60. Current collecting parts;

[0024] 70. Pump; 71. Pump inlet; 72. Pump outlet; 73. Pump casing;

[0025] 81. a first flow guide; 82. a second flow guide;

[0026] 91. Protective cover; 92. Stack top shield. DETAILED DESCRIPTION

[0027] Exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary from implementation to implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the content of this application.

[0028] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure and / or processing steps closely related to the scheme according to the present application are shown in the accompanying drawings, while other details that are not closely related to the present application are omitted.

[0029] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in this application should have the common meanings understood by persons with ordinary skills in the field to which this application belongs.

[0030] In the description of the embodiments of the present application, “plurality” means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the related art, a lead-bismuth cooling reactor is provided with a 210 Po removal device for the removal of lead-bismuth coolants in stack containers 210 The inventors of the present application have found that there is a risk of leakage of the lead-bismuth coolant when the lead-bismuth coolant in the stack container is led out of the stack container.

[0032] In order to solve the above technical problems, the embodiment of the present application provides a method for removing the activation product in the lead-bismuth coolant of the lead-bismuth cooled reactor. 210Po device. (hereinafter referred to as removal device)

[0033] See also Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of a removal device according to an embodiment of the present application, Figure 2 1 is a schematic diagram of a lead-bismuth cooled reactor according to an embodiment of the present application, wherein the arrows indicate the flow direction of the lead-bismuth coolant, and the dotted line in the figure indicates the liquid level of the lead-bismuth coolant. The removal device 10 of the embodiment of the present application may include a housing 11, a connector 12 and 210 Po removal member 13. The shell 11 is configured to form a receiving chamber 101, and a liquid inlet 102 for supplying the lead-bismuth coolant into the receiving chamber 101 is formed on the side of the shell 11, and a liquid outlet 103 for supplying the lead-bismuth coolant out of the receiving chamber 101 is formed at the bottom of the shell 11, and the liquid inlet 102 is located below the lead-bismuth coolant liquid level in the stack container 20 of the lead-bismuth cooled reactor. The connecting member 12 is connected to the top of the shell 11, and is used to suspend the shell 11 on the stack top cover 22 of the stack container 20 of the lead-bismuth cooled reactor. 210 The Po removal member 13 is used to remove the lead-bismuth coolant entering the accommodation chamber 101. 210 Po.

[0034] In the embodiment of the present application, since the shell 11 of the removal device 10 is suspended on the top cover 22 of the lead-bismuth cooled reactor, and since the liquid inlet 102 of the shell 11 is located below the lead-bismuth coolant liquid level in the stack container 20 of the lead-bismuth cooled reactor, the lead-bismuth coolant circulates only inside the stack container 20, thereby reducing the risk of lead-bismuth coolant leakage. Since the removal device 10 is arranged in the stack, by forming the accommodating cavity 101, the liquid inlet 102, the liquid outlet 103 and the arrangement on the shell 11, the lead-bismuth coolant can be circulated only inside the stack container 20. 210 The Po removal member 13 can utilize the circulation of the lead-bismuth coolant in the stack to enable the lead-bismuth coolant to enter and exit the receiving chamber 101 of the removal device 10, thereby utilizing 210 The Po removal member 13 removes the lead-bismuth coolant in the accommodation chamber 101. 210 Po.

[0035] In some embodiments, the housing 11 may include a pipe 111 and an end cap 112 that seals the lower end of the pipe 111. The end cap 112 is provided with a plurality of liquid outlets 103 for allowing the lead-bismuth coolant to flow out of the accommodating cavity 101. Providing a plurality of liquid outlets 103 on the end cap 112 is conducive to making the lead-bismuth coolant flow from the accommodating cavity 101 to the outside more evenly, and is also conducive to extending the residence time of the lead-bismuth coolant in the accommodating cavity 101, thereby improving 210 The contact efficiency between the Po removal element 13 and the lead-bismuth coolant is improved, thereby 210 The removal effect of Po removal member 13.

[0036] The middle wall of the tube 111 forms a plurality of liquid inlets 102 for supplying the lead-bismuth coolant into the accommodating cavity 101 . The liquid inlets 102 can be arranged at equal intervals in the circumferential direction of the tube 111 .

[0037] In some embodiments, the connecting member 12 may be a flange structure, and the stack top cover 22 forms a mounting opening accordingly, and the connecting member 12 is connected to the stack top cover 22 at the mounting opening.

[0038] In some embodiments, the connecting member 12 has an inner diameter greater than 210 Po removes the through hole of the outer diameter of the member 13. 210 The Po removal member 13 can enter and exit the accommodating chamber 101 through the through hole and be detachably connected to the connecting member 12. In this way, by pulling upward at the through hole of the connecting member 12, 210 Po removes part 13, and can 210 Po the removal member 13 is taken out from the accommodating chamber 101, thereby facilitating removal from the housing 11 for replacement.

[0039] In some embodiments, 210 The Po removal member 13 is connected to the connection member 12 through a nut and a gasket, so that it is easy to disassemble and is beneficial to sealing.

[0040] In some embodiments, 210 The Po removal member 13 may include a removal shell 131, a filter material 133 filled in the removal shell 131, and a rod 132 for connecting the removal shell 131 to the connection member 12. The lead-bismuth coolant entering the accommodating chamber 101 can enter the removal shell 131, thereby flowing through the filter material 133, and the filter material 133 can remove the lead-bismuth coolant. 210 Po is filtered out from the lead-bismuth coolant. In this embodiment, the removal shell 131 provides a space for accommodating the filter material 133. The removal shell 131 is connected to the connecting member 12 through the rod 132, so that the entire 210 The Po removal member 13 can be not connected to the housing 11, but suspended from the connection member 12, so as to facilitate 210 The removal piece 13 is replaced, and the position of the shell 131 in the accommodating chamber 101 can be conveniently adjusted by adjusting the length of the rod 132 .

[0041] In some embodiments, the removal shell 131 can be located between the liquid inlet 102 and the liquid outlet 103, which is conducive to the lead-bismuth coolant flowing from the liquid inlet 102 into the removal shell 131 and passing through the filter material 133. 210 Po is filtered out from the lead-bismuth coolant and then flows out from the liquid outlet 103, thereby facilitating the improvement of 210Meanwhile, by adjusting the length of the rod 132 , the shell 131 can be conveniently placed below the liquid inlet 102 .

[0042] In some embodiments, the connector 12 , the housing 11 , the shell 131 , and the rod 132 may be made of austenitic stainless steel to avoid being corroded by the lead-bismuth coolant.

[0043] The rod 132 can be welded to the removal shell 131. The upper and lower ends of the removal shell 131 can be hollowed out so that the lead-bismuth coolant can enter the removal shell 131 from the top and flow out of the removal shell 131 from the bottom.

[0044] In some embodiments, the top of the rod 132 can be threaded and connected to the connector 12 through a nut and a washer. The threaded connection allows the rod 132 to be easily replaced or repaired. 210 Po When the member 13 is removed, disassembly and assembly can be performed more conveniently.

[0045] The inventors of the present application discovered that 210 Po is easily deposited on metallic silver. Therefore, in some embodiments, the filter material 133 may be silver wire, which is filled in the removal shell 131. The inventors of the present application have found that the silver wire filled in the removal shell 131 can increase the 210 The contact area between Po and silver wire is more conducive to 210 Po is deposited, and the silver wire does not react with the lead-bismuth coolant and does not introduce impurities into the lead-bismuth coolant, making it particularly suitable as a filter material.

[0046] In some embodiments, the silver wire may have the shape of a steel ball, which may increase 210 The contact area between Po and the filter material 133 is increased, thereby improving the deposition efficiency of the filter material 133.

[0047] In some embodiments, the width of the silver wire is 0.2-0.4 mm, and the packing density is 30-50 kg / m 3 The inventor of the present application found that such a configuration is more conducive to improving the deposition efficiency of the silver wire, thereby improving 210 The removal effect of Po.

[0048] The embodiment of the present application also provides a lead-bismuth cooled reactor, which may include a reactor container 20 and a removal device 10 in any embodiment of the present application. The reactor container 20 includes a container body 21 with an opening formed on the top and a reactor top cover 22 for sealing the container body 21, and the container body 21 is used to contain the lead-bismuth coolant. The removal device 10 is suspended from the reactor top cover 22, and the liquid inlet 102 of the removal device 10 is located below the liquid level of the lead-bismuth coolant in the container body 21, and is used to remove the activation product in the lead-bismuth coolant. 210Since the removal device 10 is suspended from the reactor top cover 22, and the liquid inlet 102 of the removal device 10 is located below the liquid level of the lead-bismuth coolant in the container body 21, the lead-bismuth coolant can flow into the removal device 10 during the internal circulation of the reactor, and the activation product can be removed by the removal device 10. 210 This arrangement does not require the lead-bismuth coolant to be led out of the stack container 20 to remove the activation product. 210 Po, thereby reducing the risk of lead-bismuth coolant leakage.

[0049] The embodiment of the present application also provides a lead-bismuth cooled reactor, which may include a reactor vessel 20, a core assembly 30, a heat exchanger 40, a flow distributor 50, a current collector 60, and a pump 70. The reactor vessel 20 includes a container body 21 with an opening formed at the top and a reactor top cover 22 for closing the container body 21, and the container body 21 is used to accommodate the lead-bismuth coolant. The core assembly 30 is arranged in the container body 21. The heat exchanger 40 is used to receive the lead-bismuth coolant from the core assembly 30 and cool it. The flow distributor 50 is arranged below the core assembly 30, and is used to supply the lead-bismuth coolant to enter the core assembly 30. The current collector 60 is arranged to form a collecting cavity, and the current collector 60 is arranged radially outside the flow distributor 50, and is used to receive the lead-bismuth coolant after being cooled by the heat exchanger 40. The pump 70 is used to pump the lead-bismuth coolant in the collecting piece 60 to the upper part of the container body 21, so that the lead-bismuth coolant from the collecting piece 60 flows downward, and flows downward on the radial outside of the collecting piece 60 to the bottom of the collecting piece 60, and finally enters the flow distribution piece 50.

[0050] In the lead-bismuth cooled reactor provided by the embodiment of the present application, the lead-bismuth coolant flowing out from the core assembly 30 directly enters the heat exchanger 40, is cooled in the heat exchanger 40, and then flows directly from the inside of the heat exchanger 40 to the collecting piece 60, and then the lead-bismuth coolant is delivered to the upper part of the reactor vessel 20 body by the pump 70, and then the lead-bismuth coolant flows downward along the outer side of the collecting piece 60 to the bottom, and then re-enters the core assembly 30 evenly through the flow distribution piece 50, and continues to circulate in this way, which is more conducive to the circulation of the lead-bismuth coolant inside the reactor.

[0051] The current collecting member 60 is an annular structure, and the current collecting cavity formed by the current collecting member 60 is an annular current collecting cavity.

[0052] In some embodiments, the heat exchanger 40 includes a heat exchanger shell 43, a heat exchange inlet portion 41 and a heat exchange outlet portion 42. A heat exchange cavity for flow of lead-bismuth coolant is formed in the heat exchanger shell 43. The heat exchange inlet portion 41 forms a heat exchange inlet connected to the heat exchange cavity. The heat exchange outlet portion 42 forms a heat exchange outlet connected to the heat exchange cavity. The lead-bismuth coolant flowing through the core assembly 30 enters the heat exchange cavity through the heat exchange inlet, exchanges heat with the heat exchange medium, and then flows into the collecting cavity of the collecting member 60 from the heat exchange outlet.

[0053] In some embodiments, the heat exchange outlet portion 42 is formed at the bottom of the heat exchanger shell 43 ; the heat exchange inlet portion 41 is formed at the side of the heat exchanger shell 43 and faces the core assembly 30 .

[0054] In some embodiments, the current collector 60 has a current collector inlet and a current collector outlet communicating with the current collector cavity, and the heat exchange outlet portion 42 is connected to the current collector inlet of the current collector 60, so that the lead-bismuth coolant after heat exchange with the heat exchange medium in the heat exchange cavity directly enters the current collector cavity, and does not enter the container body 21. This arrangement allows the cooled lead-bismuth coolant to be collected in the current collector cavity.

[0055] In some embodiments, the reactor may further include a top shield 92. The top shield 92 is disposed below the top cover 22 and directly above the core assembly 30. In some embodiments, the top shield 92 may include a thermal shield layer and a neutron shield layer, which are used to reduce heat transfer and shield neutrons in the reactor, respectively.

[0056] The heat exchange inlet 41 may extend from the heat exchanger shell 43 to below the top shield 92 and be close to the lower surface of the top shield 92. In some embodiments, the reactor may further include a core shroud, and the core assembly 30 is disposed in the core shroud. The core shroud is connected to the heat exchange inlet 41, and the core shroud is provided with a liquid outlet communicating with the heat exchange inlet, and the lead-bismuth coolant flowing out of the core assembly 30 flows directly to the heat exchange inlet through the liquid outlet.

[0057] In some embodiments, the pump 70 includes a pump housing 73, a pump inlet 71, and a pump outlet 72. A pump chamber for the lead-bismuth coolant to flow is formed in the pump 70. The pump inlet 71 forms a pump inlet communicating with the pump chamber, and the pump outlet 72 forms a pump outlet communicating with the pump chamber. The lead-bismuth coolant from the manifold enters the pump chamber through the pump inlet and flows into the container body 21 from the pump outlet.

[0058] In some embodiments, the pump inlet 71 is formed at the bottom of the pump housing 73 ; the pump outlet 72 is formed at the side of the pump housing 73 and faces away from the core assembly 30 .

[0059] In some embodiments, the pump inlet 71 is connected to the current collecting outlet of the current collecting member 60, so that the lead-bismuth coolant in the current collecting cavity directly enters the pump chamber without entering the container body 21. This arrangement allows the cooled lead-bismuth coolant to be pumped to the pump outlet 72 by the pump 70, thereby improving the circulation effect of the lead-bismuth coolant and thus improving the cooling effect on the core assembly 30.

[0060] In some implementations, the heat exchanger housing 43 of the heat exchanger 40 and the pump housing 73 of the pump 70 are respectively connected to the stack top cover 22 .

[0061] In some embodiments, the reactor may further include a first flow guide 81 and a second flow guide 82. The first flow guide 81 is disposed at the bottom of the container body 21 directly below the flow distributor 50. The second flow guide 82 is disposed at the bottom of the current collector 60 to guide the lead-bismuth coolant. In this embodiment, the flow path of the lead-bismuth coolant is effectively guided by providing the first flow guide 81 and the second flow guide 82, which is beneficial for the lead-bismuth coolant at the bottom of the container body 21 to flow to the core assembly 30, thereby improving the circulation efficiency of the lead-bismuth coolant.

[0062] In some embodiments, the lower surface of the first guide member 81 may be a curved surface, so as to facilitate guiding the lead-bismuth coolant at the bottom of the container body 21 to flow toward the second guide member 82. In some embodiments, the upper surface of the second guide member 82 may be a curved surface, so as to facilitate guiding the lead-bismuth coolant to the flow distribution member 50.

[0063] In some embodiments, the first flow guide 81 may be connected to the lower surface of the flow collector 60. The first flow guide 81 is an annular structure, and its ring width is the same as that of the flow collector 60, and its radial outer diameter and radial inner diameter are the same, that is, the inner diameter of the first flow guide 81 is the same as the diameter of the flow distributor 50.

[0064] The diameter of the second flow guide 82 is greater than the diameter of the flow distributor 50 , so that the second flow guide 82 partially overlaps with the first flow guide 81 in the radial direction of the container body 21 , thereby being more conducive to guiding the lead-bismuth coolant at the bottom of the container body 21 to the flow distributor 50 .

[0065] In some embodiments, there are two heat exchangers 40, which are symmetrically arranged on both radial sides of the core assembly 30. In some embodiments, there are two pumps 70, which are symmetrically arranged on both radial sides of the core assembly 30 and are respectively located radially outside the two heat exchangers 40. The heat exchange outlet 42 of each heat exchanger 40 and the pump inlet 71 of each pump 70 are connected to the manifold 60, so that the lead-bismuth coolant flowing out of the heat exchange cavity of each heat exchanger 40 can directly enter the manifold cavity and be pumped into the pump casing 73.

[0066] Since the temperature in the core assembly 30 is relatively high, the lead-bismuth coolant easily forms aerosol after absorbing the heat of the core assembly 30 and rises to the reactor top cover 22. Therefore, in some embodiments, the reactor may further include a protective cover 91. The protective cover 91 is used to form a closed negative pressure space above the reactor top cover 22, thereby preventing the leakage of radioactive aerosol.

[0067] In some embodiments, the reactor may further include a removal device 10 in any embodiment of the present application, the removal device 10 is suspended on the reactor top cover 22, and the liquid inlet 102 of the removal device 10 is located below the liquid level of the lead-bismuth coolant in the container body 21, and is used to remove the activation product in the lead-bismuth coolant. 210 Since the removal device 10 is suspended from the reactor top cover 22, and the liquid inlet 102 of the removal device 10 is located below the liquid level of the lead-bismuth coolant in the container body 21, the lead-bismuth coolant can flow into the removal device 10 during the internal circulation of the reactor, and the activation product can be removed by the removal device 10. 210 This arrangement does not require the lead-bismuth coolant to be led out of the stack container 20 to remove the activation product. 210 Po, thereby reducing the risk of lead-bismuth coolant leakage.

[0068] In some embodiments, the pump outlet 72 is arranged to be higher than the liquid inlet 102 of the removal device 10 , which facilitates the lead-bismuth coolant flowing out of the pump outlet 72 to flow into the removal device 10 .

[0069] In some embodiments, after the reactor has been running for a certain period, the 210 The Po removal member 13 is lifted upward to the top of the stack top cover 22 and replaced or maintained outside the protective cover 91 .

[0070] In some embodiments, the area above the lead-bismuth coolant liquid level in the stack container 20 is filled with a protective gas, which may be argon.

[0071] According to calculations, in a lead-bismuth cooled reactor without a removal device 10, the amount of activated 210 Po reaches saturation in about the third year, with a saturation activity of 3E+15Bq. Figure 3 shown.

[0072] Figure 4 Is a lead-bismuth cooled reactor in different 210 Under the removal efficiency of Po (removal efficiency is 0.1, 0.3, 0.5, 0.7 and 0.9 respectively), the lead-bismuth coolant 210 The activity of Po changes with time. Figure 4 It can be seen that if the removal efficiency reaches 0.9, 210 Po reaches saturation on the 60th day of full power operation, with a saturation activity of 4.0E+10Bq, which is 5 orders of magnitude lower than that without the removal device 10. Even when the removal efficiency can only reach 0.1, 210Po can reach saturation on the 50th day at full power, with a saturation activity of 3.8E+11Bq, which is 4 orders of magnitude lower than when no removal device 10 is provided. From the above analysis, it can be seen that by adding a removal device 10 in the lead-bismuth coolant, the 210 The activity of Po reaches saturation and effectively reduces its saturation activity, further reducing the activity of the protective gas migrating to the covering, thereby reducing the leakage to the process room and the environment.

[0073] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.

[0074] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for removing activation products from lead-bismuth coolant in lead-bismuth cooled reactors 210 The device of Po is characterized in that The device comprises: A shell, the shell is configured to form a receiving cavity, a side of the shell forms a liquid inlet for the lead-bismuth coolant to flow into the receiving cavity, a bottom end of the shell forms a liquid outlet for the lead-bismuth coolant to flow out of the receiving cavity, and the liquid inlet is located below the lead-bismuth coolant liquid level in the stack container of the lead-bismuth cooled reactor; A connector connected to the top of the shell and used to suspend the shell on the top cover of the stack container of the lead-bismuth cooled reactor; 210 Po removal piece, used to remove the lead-bismuth coolant entering the accommodating cavity 210 Po.

2. The device according to claim 1, characterized in that The connecting member has an inner diameter larger than the 210 Po removes the through hole of the outer diameter of the part; Said 210 The Po removal piece can enter and exit the accommodating cavity through the through hole and be detachably connected to the connecting piece.

3. The device according to claim 2, characterized in that Said 210 The Po removal member comprises: a removal shell, a filter material filled in the removal shell, and a rod for connecting the removal shell with the connection member; The lead-bismuth coolant entering the receiving chamber can enter the removal shell, thereby flowing through the filter material, and the filter material can 210 Po is filtered out of the lead-bismuth coolant.

4. The device according to claim 3, characterized in that The filter material is silver wire, and the silver wire is filled in the removal shell.

5. The device according to claim 4, characterized in that The width of the silver wire is 0.2-0.4 mm, and the filling density is 30-50 kg / m 3 .

6. The device according to claim 3, characterized in that The removal shell is located between the liquid inlet and the liquid outlet.

7. A lead-bismuth cooled reactor, characterized in that: include: A stack container, the stack container comprising a container body with an opening formed on the top and a stack cover for closing the container body, the container body being used to contain a lead-bismuth coolant; A core assembly is disposed in the container body; a heat exchanger for receiving and cooling the lead-bismuth coolant from the core assembly; A flow distribution member, disposed below the core assembly, for supplying lead-bismuth coolant into the core assembly; A current collecting member, arranged to form a current collecting cavity, the current collecting member being arranged radially outside the flow distribution member and used for receiving the lead-bismuth coolant after being cooled by the heat exchanger; A pump is used to pump the lead-bismuth coolant in the current collecting piece to the upper part of the container body, so that the lead-bismuth coolant from the current collecting piece flows downward, flows downward on the radial outside of the current collecting piece to the bottom of the current collecting piece, and finally enters the flow distribution piece.

8. The reactor according to claim 7, characterized in that Also includes: A first flow guide member, disposed at the bottom of the container body, directly below the flow distribution member; The second flow guide is arranged at the bottom of the current collecting member and is used for guiding the lead-bismuth coolant.

9. The reactor according to claim 7, characterized in that Also includes: A protective cover is used to form a closed negative pressure space above the stack top cover.

10. A lead-bismuth cooled reactor, characterized in that: include: A stack container, the stack container comprising a container body with an opening formed on the top and a stack cover for closing the container body, the container body being used to contain a lead-bismuth coolant; The method according to any one of claims 1 to 6, which is suitable for removing the activation product in the lead-bismuth coolant of the lead-bismuth cooled reactor 210 Po device, the device is suspended on the stack top cover, the liquid inlet of the device is located below the liquid level of the lead-bismuth coolant in the container body, and is used to remove the activation products in the lead-bismuth coolant 210 Po.

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