Method for obtaining migration data of fission products in sodium combustion process

Abstract

An embodiment of the present invention provides a method for obtaining migration data of fission products in a sodium combustion process, comprising the following steps: obtaining liquid sodium; mixing the liquid sodium and the fission products; burning the liquid sodium in which the fission products are dissolved; collecting aerosol deposits generated by the combustion of the liquid sodium; and analyzing the aerosol deposits to obtain migration data of the fission products, wherein, in the combustion step, the liquid sodium is in an air atmosphere.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of reactor safety, and in particular to a method for obtaining migration data of fission products in a sodium combustion process. Background Art

[0002] In the event of a serious accident in a sodium-cooled fast reactor, sodium leakage may occur and cause a sodium fire. When a sodium fire occurs, liquid sodium burns in the air, and the fission products dissolved in the liquid sodium are released into the air as the sodium burns, and eventually deposited on the inner surface of the reactor containment or in the environment. This process involves the migration of fission products.

[0003] Obtaining accurate and true migration data of fission products is a necessary condition for improving the technical level of severe accident analysis. Therefore, it is necessary to design a method for obtaining migration data of fission products in the sodium combustion process and a reactor sodium combustion accident simulation test device. Summary of the invention

[0004] The present application is proposed to overcome at least one aspect of the above problems.

[0005] An embodiment of the present invention provides a method for obtaining migration data of fission products in a sodium combustion process, which comprises the following steps: obtaining liquid sodium; mixing liquid sodium and fission products; burning the liquid sodium in which the fission products are dissolved; collecting aerosol deposits generated by the combustion of liquid sodium; and analyzing the aerosol deposits to obtain migration data of the fission products, wherein, in the combustion step, the liquid sodium is in an air atmosphere.

[0006] An embodiment of the present invention also provides a method for obtaining migration data of fission products in a sodium combustion process, which comprises the following steps: mixing solid sodium and fission products; heating the solid sodium and fission products so that the fission products are dissolved in liquid sodium produced after the solid sodium melts; burning the liquid sodium in which the fission products are dissolved; collecting aerosol deposits produced by the combustion of liquid sodium; and analyzing the aerosol deposits to obtain migration data of fission products, wherein, in the combustion step, the liquid sodium is in an air atmosphere.

[0007] An embodiment of the present invention also provides a reactor sodium combustion accident simulation test device, which is used to simulate the migration process of fission products dissolved in liquid sodium when an accident occurs in the reactor, and includes: a mixing container, which is configured to provide a space for mixing solid sodium and fission products; a first heating device, which is configured to heat the mixing container so that the solid sodium is converted into liquid sodium and the fission products are dissolved in the liquid sodium, and a combustion container, which is configured to receive liquid sodium dissolved with fission products from the mixing container; a second heating device, which is configured to heat the combustion container; wherein the combustion container is configured to maintain communication with the external environment air and the aerosol generated by the liquid sodium is not communicated with the external environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0009] Figure 1 A schematic diagram of a process for obtaining migration data of fission products in a sodium combustion process according to an embodiment of the present invention;

[0010] Figure 2 A schematic diagram of a process for obtaining migration data of fission products in a sodium combustion process according to an embodiment of the present invention;

[0011] Figure 3 A schematic diagram of an apparatus for obtaining migration data of fission products in a sodium combustion process according to an embodiment of the present invention;

[0012] Figure 4 A schematic diagram of an apparatus for obtaining migration data of fission products in a sodium combustion process according to an embodiment of the present invention;

[0013] Figure 5 It is a schematic diagram of a reactor sodium combustion accident simulation test equipment according to an embodiment of the present invention. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] An embodiment of the present invention provides a method for obtaining migration data of fission products in a sodium combustion process, which comprises the following steps: obtaining liquid sodium; mixing liquid sodium and fission products; burning the liquid sodium in which the fission products are dissolved; collecting aerosol deposits generated by the combustion of liquid sodium; and analyzing the aerosol deposits to obtain migration data of the fission products, wherein, in the combustion step, the liquid sodium is in an air atmosphere.

[0016] An embodiment of the present invention also provides a method for obtaining migration data of fission products in a sodium combustion process, which comprises the following steps: mixing solid sodium and fission products; heating the solid sodium and fission products so that the fission products are dissolved in liquid sodium produced after the solid sodium melts; burning the liquid sodium in which the fission products are dissolved; collecting aerosol deposits produced by the combustion of liquid sodium; and analyzing the aerosol deposits to obtain migration data of fission products, wherein, in the combustion step, the liquid sodium is in an air atmosphere.

[0017] Combine the following Figure 1 , Figure 2 and Figure 3 Each step of the method for obtaining migration data of fission products in a sodium combustion process provided by an embodiment of the present invention is described in detail.

[0018] Step S101, obtaining liquid sodium.

[0019] Liquid sodium can be obtained by heating solid sodium. When heating solid sodium, it is necessary to heat it under the condition of isolating from air or other gases that do not react with sodium to prevent the sodium from reacting in the gas atmosphere in which it is located.

[0020] Step S102, mixing liquid sodium and fission products.

[0021] Since sodium is in liquid form, the fission products can be dissolved in the liquid sodium to achieve a more uniform mixing of the fission products and the sodium. In some embodiments, powdered fission products can be mixed with the liquid sodium to accelerate the dissolution rate and make the mixing more uniform.

[0022] In some embodiments, in order to prevent the liquid sodium from being oxidized by air or burning when heated, the liquid sodium and the fission products can be mixed in an environment that is isolated from air and can maintain a certain temperature. In some embodiments, an environment that is isolated from air and can maintain a certain temperature (which can be called a mixed environment in the embodiments of the present invention) can be provided by a mixing container 50, that is, the liquid sodium and the fission products can be mixed in the mixing container 50. The mixing container 50 is a sealed structure that can isolate the air outside the mixing container 50. The mixing container 50 is provided with a first heating device 52, and the first heating device 52 can heat the sodium inside the mixing container 50 so that the solid sodium inside the mixing container 50 melts and maintains a liquid state, and / or prevents the liquid sodium inside the mixing container 50 from re-solidifying into solid sodium. In some embodiments, the first heating device 52 is used to maintain the inside of the mixing container 50 at a first preset temperature so that the liquid sodium dissolved with the fission products in the mixing container 50 is maintained at the first preset temperature, so as to facilitate the ignition of the liquid sodium in the subsequent process.

[0023] In some embodiments, the mixed liquid sodium and fission products are heated and maintained for a predetermined time. The predetermined time may be the time required for the fission products to fully dissolve in the liquid sodium. By maintaining the predetermined time, the liquid sodium and the fission products are fully mixed.

[0024] In some alternative embodiments, such as Figure 2 As shown, a method for obtaining migration data of fission products of a sodium combustion process may include:

[0025] Step S201, mixing solid sodium and fission products.

[0026] Solid sodium and fission products may be mixed in the mixing container 50 , that is, the solid sodium and fission products are first added into the mixing container 50 for mixing.

[0027] Step S202, heating the solid sodium and the fission products so that the fission products are dissolved in the liquid sodium generated after the solid sodium is melted.

[0028] The first heating device 52 of the mixing container 50 can be used to heat the solid sodium and fission products previously placed in the mixing container 50, so that the fission products are dissolved in the liquid sodium produced after the solid sodium is melted.

[0029] In some embodiments, the heating is maintained for a predetermined time, which may be the time required for the fission products to completely dissolve in the liquid sodium. By maintaining the heating for the predetermined time, the liquid sodium and the fission products are fully mixed.

[0030] The migration data of the fission products involved in the embodiments of the present invention are the migration data of the fission products mixed with sodium during the combustion of sodium in air. In the embodiments of the present invention, by dissolving the fission products in liquid sodium and then burning them, the sodium and the fission products can be fully mixed before combustion, which can be closer to the actual situation of the migration of fission products in sodium under the reactor sodium combustion accident condition.

[0031] Continue to see Figure 1 , Figure 2 and Figure 3 .

[0032] In step S103 or step S203, liquid sodium in which the fission products are dissolved is burned.

[0033] In some embodiments, the liquid sodium is in different containers before and during the combustion of the liquid sodium. The liquid sodium in which the fission product is dissolved can be burned by transferring the liquid sodium in which the fission product is dissolved to an environment having an air atmosphere and maintaining a second preset temperature without the need for an additional ignition (ignition) device (means). In some embodiments, a combustion container 10 can be used to provide an environment having an air atmosphere and maintaining a second preset temperature (which can be referred to as a combustion environment in an embodiment of the present invention), that is, the liquid sodium in which the fission product is dissolved is transferred to the combustion container 10 to cause the liquid sodium in which the fission product is dissolved to burn. The second preset temperature can be a temperature at which sodium can burn in the air, such as 200°C. Of course, it can also be other temperatures at which sodium can burn in the air, and the present invention does not limit this. The combustion container 10 maintains the second preset temperature through a second heating device 30, and the second heating device 30 is configured to heat the combustion container 10 so that the cavity 11 inside the combustion container 10 maintains the second preset temperature.

[0034] The liquid sodium in which the fission products are dissolved in the mixing container 50 can be transferred to the combustion container 10 having an air atmosphere and reaching a second preset temperature through the sodium injection pipeline 51 .

[0035] In certain embodiments, the liquid sodium dissolved in the fission product in the mixing container 50 is transferred to the combustion section 20 in the combustion container 10 having an air atmosphere and reaching a second preset temperature, so that the liquid sodium dissolved in the fission product is burned. The combustion section 20 can be a container that can accommodate liquid sodium, and the specific position where the liquid sodium burns in the combustion container 10 is the combustion section 20. In certain embodiments, the combustion section 20 can be a combustion tray, and the liquid sodium can have a larger area in contact with the air in the combustion tray, which is conducive to the combustion of the liquid sodium and pool combustion occurs. Of course, it can also be other containers suitable for the combustion of liquid sodium, and the present invention does not limit this. The sodium injection pipeline 51 connects the mixing container 50 and the combustion section 20 in the combustion container 10, and the liquid sodium can flow from the mixing container 50 to the combustion section 20 in the combustion container 10 via the sodium injection pipeline 51.

[0036] By reasonably setting the first preset temperature and the second preset temperature, liquid sodium can be made to burn when it flows into the combustion part 20 without setting an additional ignition device. In some embodiments, the first preset temperature is greater than the second preset temperature, so that the liquid sodium flowing into the combustion part 20 has a temperature higher than that of the combustion part 20, and therefore, liquid sodium can burn when it flows into the combustion part 20 without going through an additional heating process. This sodium ignition method can prevent sodium from being heated in the air and slowly oxidizing, and sodium oxides are generated before sodium burns, affecting the test results of migration data. The second preset temperature is used to maintain the continuous combustion of sodium in the air. In some embodiments, the first preset temperature can be 400°C, and the second preset temperature can be 200°C-300°C.

[0037] Step S104 or step S204, collecting aerosol deposits generated by the combustion of liquid sodium.

[0038] Liquid sodium containing fission products burns in the air to produce aerosols containing fission products, which are released into the air. After the combustion is completed, the aerosols released into the air eventually settle. The migration data of the fission products can be obtained by collecting the aerosol deposits produced by the combustion of liquid sodium. In some embodiments, liquid sodium containing fission products burns in a combustion container 10, and the aerosols are deposited in the combustion container 10. The migration data of the fission products can be obtained by collecting the aerosol deposits in the combustion container 10. See Figure 4 In some embodiments, aerosol deposits may be collected by providing a sampling device 40 in the combustion vessel 10 before sodium combustion begins.

[0039] When collecting aerosol deposits, aerosol deposits at different heights can be collected. By collecting aerosol deposits at different heights, migration data at different heights can be obtained, so that the migration data can better reflect the spatial distribution law. Aerosol deposits at different heights can be collected by arranging sampling devices 40 at different heights in the combustion container 10.

[0040] When collecting aerosol deposits, aerosol deposits at different positions at the same height can be collected. By collecting aerosol deposits at different positions at the same height, an average value of the measurement can be obtained through aerosol deposits at different positions at the same height to avoid accidental errors and make the migration data more accurate. Aerosol deposits at different positions at the same height can be collected by setting a plurality of sampling devices 40 at the same height in the combustion container 10.

[0041] When collecting aerosol deposits, aerosol deposits at all height positions can be collected, that is, all aerosol deposits generated by the combustion of liquid sodium in which fission products are dissolved are collected. By collecting aerosol deposits at all height positions, the migration data of the overall fission products can be obtained. The aerosol deposits at all height positions can be collected by arranging a cleaning device 71 on the top of the combustion container 10 and using the cleaning device 71 to clean the aerosol deposits attached to the inner wall of the combustion container 10 and other structures in the cavity 11. After cleaning, the liquid with aerosol deposits can be discharged from the drain device 72 into a designated container to collect aerosol deposits at all height positions.

[0042] Step S105 or S205, analyzing aerosol deposition to obtain migration data of fission products.

[0043] In some embodiments, the fission product may be CsI, and of course, may be other types of fission products, which are not limited in the present invention. After the aerosol with the fission product is deposited on the sampling device 40 to form an aerosol deposit, the aerosol deposit is collected in a reagent bottle. The aerosol sample can be analyzed and processed to obtain the migration data of the fission product. In some embodiments, before the fission product is dissolved in liquid sodium, the initial weight of the fission product is weighed. In some embodiments, the content of the fission product in the aerosol deposit can be measured by an inductively coupled plasma mass spectrometer to obtain an accurate fission product concentration. In some embodiments, the migration data of the fission product is obtained by converting and calculating the initial weight of the fission product and the content of the fission product in the aerosol deposit.

[0044] In certain embodiments, in the combustion step (i.e. the step of burning the liquid sodium that has dissolved the fission product), the combustion environment of the liquid sodium is kept to be communicated with the ambient air, and the aerosol is kept to be not communicated with the ambient environment. By keeping the combustion environment of the liquid sodium to be communicated with the ambient air, and keeping the aerosol to be not communicated with the ambient environment, the aerosol produced by the sodium combustion can be not diffused to the combustion environment outside, preventing the measurement result from being inaccurate and polluting the ambient environment, and the oxygen consumed in the combustion environment during the sodium combustion process can also be compensated, so that sodium can be fully and continuously burned and the pressure is maintained to be equal to the ambient environment. Can be by arranging a filter 60 on the wall of the combustion container 10, the filter 60 is configured to allow air to pass freely but does not allow aerosol to pass through, realizes keeping the combustion environment of the liquid sodium to be communicated with the ambient air, and keeps the aerosol to be not communicated with the ambient environment. In the embodiment of the present invention, keeping the combustion environment of liquid sodium connected to the external environment means that the combustion environment is connected to the external environment and the gas between the combustion environment and the external environment can be freely exchanged, and keeping the aerosol isolated from the external environment means that the aerosol cannot diffuse from the combustion environment to the external environment.

[0045] In certain embodiments, after the liquid sodium fuel finishes, the combustion environment of the cleaning liquid sodium is continued to use during the next simulation experiment. In certain embodiments, the combustion environment (being combustion vessel 10 in the present embodiment) of the cleaning device 71 cleaning liquid sodium can be used.

[0046] See also Figure 4 and Figure 5 The embodiment of the present invention also provides a reactor sodium combustion accident simulation test equipment, which is used to simulate the migration process of fission products dissolved in liquid sodium when an accident occurs in the reactor, and includes: a mixing container 50, which is configured to provide a space for mixing solid sodium and fission products; a first heating device, the first heating device 52 is configured to heat the mixing container 50, so that the solid sodium becomes liquid sodium and the fission products are dissolved in the liquid sodium, a combustion container 10, the combustion container 10 is configured to receive the liquid sodium dissolved in the fission products from the mixing container 50; a second heating device 30, the second heating device 30 is configured to heat the combustion container 10; wherein the combustion container 10 is configured to maintain communication with the external environment air and the aerosol generated by the combustion of liquid sodium is not communicated with the external environment. The method for obtaining migration data of fission products in the sodium combustion process provided by the embodiment of the present invention can be implemented using the reactor sodium combustion accident simulation test equipment provided by the embodiment of the present invention.

[0047] In some embodiments, the mixing container 50 is connected to the combustion part 20 in the combustion container 10 through the sodium injection pipeline 51, so that the liquid sodium flowing out of the mixing container 50 can directly enter the combustion part 20 after flowing out of the sodium injection pipeline 51. In some embodiments, a valve can be provided on the sodium injection pipeline 51 to control the injection of liquid sodium, and the valve can be installed on the part of the sodium injection pipeline 51 located outside the combustion container 10 to facilitate opening or closing the valve. One end of the sodium injection pipeline 51 is connected to the mixing container 50, and the other end of the sodium injection pipeline 51 is connected to the combustion part 20, so that the mixing container 50 is connected to the combustion part 20 through the sodium injection pipeline 51. The sodium injection pipeline 51 penetrates the wall of the combustion container 10, a part of the sodium injection pipeline 51 enters the cavity 11 and extends to the combustion part 20, and the other part of the sodium injection pipeline 51 is located outside the combustion container 10 and connected to the mixing container 50. The mixing container 50 is connected to the combustion part 20 through the sodium injection pipeline 51, so that the sodium in the mixing container 50 can flow directly into the combustion part 20 through the sodium injection pipeline 51. After the sodium just flowing out from the sodium injection pipe 51 enters the combustion section 20, it can burn immediately when the temperature required for the combustion of sodium in the air is met.

[0048] In some embodiments, a combustion part bracket 21 is provided in the cavity 11 of the combustion container 10, and the combustion part 20 can be set on the combustion part bracket 21. The position of the combustion part 20 in the cavity 11 of the combustion container 10 can be controlled by the combustion part bracket 21, so that there is enough space above the combustion part 20 to ensure that the aerosol can be fully diffused, so that the measurement result is more accurate.

[0049] In some embodiments, the combustion container 10 may include a cylinder serving as the main body of the combustion container 10 and a head disposed on the top of the cylinder, and the cylinder and the head together form a cavity 11. The cylinder and the head may be detachably fixedly connected to facilitate installation and removal of other structures in the cavity 11 (such as the sampling device 40, the combustion unit 20, etc.).

[0050] In some embodiments, the second heating device 30 is disposed outside the combustion container 10. The second heating device 30 is configured to be a structure capable of heating the combustion container 10, so as to heat the combustion container 10. The present invention does not limit the heating method and specific location of the second heating device 30. The second heating device 30 is disposed outside the combustion container 10 and is capable of heating the combustion container 10. The second heating device 30 is disposed outside the combustion container 10, which is convenient for installation and can prevent the second heating device 30 from interfering with the deposition and collection of aerosols in the cavity 11. In addition, the heat is transferred to the cavity 11 after being diffused through the wall of the combustion container 10, so that the heat distribution inside the cavity 11 is relatively uniform. The wall of the combustion container 10 can be a heat-conducting material, such as a metal. After the second heating device 30 heats the combustion container 10, the temperature inside the cavity 11 of the combustion container 10 can be increased, and the heat is transferred to the cavity 11 through the second heating device 30.

[0051] In some embodiments, the second heating device 30 is disposed on the outer wall of the combustion container 10, that is, the second heating device 30 is disposed on the outer wall of the combustion container 10 and covers most of the outer wall of the combustion container 10. With this arrangement, the second heating device 30 can heat the cavity 11 of the combustion container 10 more efficiently and evenly, so that the temperature inside the cavity 11 rises to a specified temperature faster and the temperature distribution is more even.

[0052] In some embodiments, the second heating device 30 is a layered heating structure, which is coated on the outer wall of the combustion container 10. With this arrangement, the second heating device 30 can heat the cavity 11 of the combustion container 10 more efficiently and evenly, and the cavity 11 can be kept warm by the layered heating structure, which is more conducive to maintaining the temperature in the cavity 11 at a specified temperature. In some embodiments, the layered heating structure can be an electric heating layer.

[0053] In some embodiments, the reactor sodium combustion accident simulation test equipment includes a sampling device 40. The sampling device 40 is disposed in the cavity 11. In some embodiments, the sampling device 40 can be disposed on the inner wall of the combustion container 10.

[0054] In some embodiments, the reactor sodium combustion accident simulation test equipment includes a plurality of sampling devices 40 .

[0055] In some embodiments, a plurality of sampling devices 40 are disposed at different heights of the combustion container 10. The sampling devices 40 may be disposed at different heights in the combustion container 10 to collect aerosol deposition at different heights to obtain migration data at different heights, so that the migration data can better reflect the spatial distribution law.

[0056] In some embodiments, a plurality of sampling devices 40 are disposed at different positions at the same height of the combustion container 10. By disposing a plurality of sampling devices 40 at different positions at the same height in the combustion container 10, aerosol deposition at different positions at the same height can be collected, and an average value of the measurements can be obtained through aerosol deposition at different positions at the same height to avoid accidental errors and make the migration data more accurate.

[0057] In some embodiments, a plurality of sampling devices 40 are disposed on the combustion portion support 21 around the combustion portion 20 to collect aerosol deposits at locations around the combustion portion 20 .

[0058] In some embodiments, the combustion container 10 can be set to maintain communication with the air of the external environment and the aerosol generated by the liquid sodium is not connected to the external environment by setting a filter device 60. The external environment refers to the environment outside the combustion environment (the non-combustion container 10 in this embodiment). The filter device 60 can be set to allow air to pass freely but not allow aerosol to pass. The filter device 60 can prevent the aerosol generated by the combustion of sodium from diffusing to the outside of the combustion environment, preventing inaccurate measurement results and polluting the external environment, and can also compensate for the oxygen consumed in the combustion environment during the combustion of sodium, so that the sodium can be fully and continuously burned and maintain the pressure equal to the external environment. The filter device 60 can be set at any position of the combustion container 10. In some embodiments, the filter device 60 can be set on the end cap of the combustion container 10.

[0059] In some embodiments, the reactor sodium combustion accident simulation test equipment includes a cleaning device 71, and the cleaning device 71 is configured to clean the combustion container 10. The cleaning device 71 can be arranged on the top of the combustion container 10, and specifically, the cleaning device 71 can be arranged on the head of the combustion container 10. The cleaning device 71 is used to clean the combustion container 10, and the cleaning device 71 can also be used to collect aerosol deposits.

[0060] In some embodiments, the reactor sodium combustion accident simulation test equipment includes a drain device 72, which is used to drain the liquid in the combustion container 10. The drain device 72 can be arranged at the bottom of the combustion container 10. The drain device 72 is used to drain the waste liquid, and the drain device 72 can also be used to collect aerosol deposits.

[0061] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for obtaining migration data of fission products in a sodium combustion process, comprising the steps of: Obtain liquid sodium; mixing the liquid sodium and the fission product; burning the liquid sodium in which the fission products are dissolved; collecting aerosol deposits generated by the combustion of the liquid sodium; Analyzing the aerosol deposits to obtain migration data of the fission products, wherein: In the burning step, the liquid sodium is in an air atmosphere; The combustion environment of the liquid sodium is kept in communication with the external ambient air, and the aerosol is kept incommunicative with the external environment.

2. A method for obtaining migration data of fission products in a sodium combustion process, comprising the steps of: Mixing solid sodium and fission products; Heating the solid sodium and the fission product so that the fission product dissolves in liquid sodium generated after the solid sodium melts; burning the liquid sodium in which the fission products are dissolved; collecting aerosol deposits generated by the combustion of the liquid sodium; Analyzing the aerosol deposits to obtain migration data of the fission products, wherein: In the combustion step, the liquid sodium is in an air atmosphere; the combustion environment of the liquid sodium is kept in communication with the external ambient air, and the aerosol is kept in communication with the external environment.

3. The method according to claim 1 or 2, wherein: In the heating step, the ambient temperature of the liquid sodium is 400° C. In the combustion step, the ambient temperature of the liquid sodium is 200°C-300°C.

4. The method according to claim 1, wherein: During the mixing step, The mixed liquid sodium and the fission product are heated and maintained for a predetermined time.

5. The method according to claim 2, wherein: During the heating step, Keep heating for the predetermined time.

6. The method according to claim 1 or 2, wherein: In the collection step, The aerosol deposits are collected at different height positions.

7. The method according to claim 1 or 2, wherein: In the collection step, The aerosol deposition is collected at different positions at the same height.

8. The method according to claim 1 or 2, wherein: In the collection step, The aerosol deposition was collected at all altitudes.

9. The method according to claim 1 or 2, wherein: Before the liquid sodium is burned and when the liquid sodium is burned, the liquid sodium is in different containers.

10. The method according to claim 1 or 2, wherein: The following steps are also included: After the combustion of the liquid sodium is completed, the combustion environment of the liquid sodium is cleaned.

11. A reactor sodium combustion accident simulation test device, which is used to simulate the migration process of fission products dissolved in liquid sodium when a reactor accident occurs, and comprises: A mixing vessel configured to provide a space for mixing solid sodium and fission products; a first heating device, the first heating device being configured to heat the mixing container so that the solid sodium becomes liquid sodium and the fission product dissolves in the liquid sodium, a combustion vessel, the combustion vessel being configured to receive the liquid sodium in which the fission products are dissolved from the mixing vessel; a second heating device, the second heating device being configured to heat the combustion container; Wherein, the combustion container is arranged to maintain communication with the external ambient air and the aerosol generated by the combustion of liquid sodium is not communicated with the external environment. 12 . The reactor sodium combustion accident simulation test equipment according to claim 11 , comprising a plurality of sampling devices, wherein the plurality of sampling devices are arranged at different heights of the combustion container.

13. The reactor sodium combustion accident simulation test equipment according to claim 11, comprising a plurality of sampling devices, wherein the plurality of sampling devices are arranged at different positions at the same height of the combustion container.

14. The reactor sodium combustion accident simulation test equipment according to claim 11, comprising a cleaning device, wherein the cleaning device is configured to clean the combustion container.

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