Thermotechnical device and method for uranium hydrogen zirconium reactor liquid metal irradiation test loop

Abstract

The invention discloses a thermotechnical device and method for a uranium hydrogen zirconium reactor liquid metal irradiation test loop. The thermotechnical device comprises a detachable dry well, an in-reactor arrangement environment and an out-reactor liquid metal loop. The detachable dry well is located in the in-reactor arrangement environment and connected with the oil cold-heat exchanger, the calibration barrel, the liquid metal flowmeter, the driving pump, the driving pump bypass and the preheating heating section through pipelines to form an irradiation loop. The detachable dry well for flowing liquid metal is arranged in the research reactor, the liquid metal irradiation loop environment is set up, the dry well and the research reactor are decoupled, and the dry well and the research reactor can be independently disassembled and assembled and transformed according to needs; by building the out-of-pile liquid metal loop and connecting the out-of-pile liquid metal loop with the detachable dry well flange, flowing of liquid metal is achieved, and the out-of-pile liquid metal loop and the detachable dry well are separately overhauled and assembled. According to the design method and device, the liquid metal irradiation environment can be built, and the pressure boundary integrity of the reactor pool is fully considered and researched.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermal design of uranium-hydrogen-zirconium research reactor, and particularly relates to a thermal device and method for a liquid metal irradiation test loop of a uranium-hydrogen-zirconium reactor. BACKGROUND

[0002] The uranium-hydrogen-zirconium research reactor is an important research reactor design route, and its main design features include a normal temperature and pressure pool reactor, uranium-hydrogen-zirconium core fuel safety, pool water passive natural cooling in accidents, and the like. The uranium-hydrogen-zirconium research reactor is a non-power reactor design scheme with strong inherent safety, and has many mature construction experiences. In order to support the research of the fourth generation liquid metal new type nuclear power technology, a flow liquid metal irradiation test loop can be arranged in a core region of the uranium-hydrogen-zirconium research reactor, and the irradiation characteristics of the liquid metal and the in-core component submerged by the liquid metal under the irradiation environment of the research reactor are explored.

[0003] The existing research reactor irradiation test loop design idea is to arrange a vertical pipe along an axial direction in a reactor pool, and connect the vertical pipe with an external loop to form an irradiation test loop independent of the reactor pool. The above-mentioned irradiation test loop design needs to penetrate the entire reactor pool, which will damage the pressure boundary of the reactor pool, increase the maintenance difficulty, and exist potential problems such as chemical reaction, corrosion aggravation, cooling and solidification, and replacement difficulty caused by the contact between the liquid metal and water. SUMMARY

[0004] The present application aims to provide a thermal device and method for a liquid metal irradiation test loop of a uranium-hydrogen-zirconium reactor, which realizes the construction of a liquid metal irradiation loop environment by arranging a detachable dry well for flowing liquid metal in the research reactor, and the dry well is decoupled from the research reactor and can be separately disassembled and reformed as needed. The liquid metal flow is realized by connecting the dry well flange with the external liquid metal loop, and the two parts of the external liquid metal loop and the detachable dry well are separately maintained and assembled. The design method and device can realize the construction of the liquid metal irradiation environment, fully consider the pressure boundary integrity of the reactor pool, and the detachable dry well and the external liquid metal loop can be independently disassembled, and can be flexibly maintained and reformed according to the test needs.

[0005] The technical scheme of the present application is as follows: a thermal device for a liquid metal irradiation test loop of a uranium-hydrogen-zirconium reactor, comprising a detachable dry well, an in-pile arrangement environment and an external liquid metal loop; the detachable dry well is located in the in-pile arrangement environment, and is connected with an oil cooling heat exchanger, a calibration barrel, a liquid metal flow meter, a drive pump, a drive pump bypass and a preheating heating section through pipelines to form an irradiation loop.

[0006] The detachable dry well is hoisted in the dry well arrangement space and is sealed at the top by a detachable flange; the inside of the detachable dry well is arranged with high-temperature liquid metal flow channels, high-temperature liquid metal flows into the channels from the innermost layer and flows out of the channels from the annular layer, the two layers of channels are separated by the innermost layer of the separation cylinder, and the two layers of channels are wrapped and separated by the annular layer of the separation cylinder; the annular layer of the separation cylinder is a gas gap layer in the radial direction, and the gas gap layer is a shielding layer in the radial direction.

[0007] The in-pile arrangement environment comprises a reactor pool, a uranium-zirconium hydrogen core and a dry well arrangement space; the detachable dry well is located in the dry well arrangement space, and the outside of the dry well arrangement space is sequentially provided with the uranium-zirconium hydrogen core and the reactor pool.

[0008] The dry well arrangement space is isolated from the reactor pool along the whole height in the circumferential direction; the uranium-zirconium hydrogen core comprises a plurality of fuel assemblies and is entirely immersed in the reactor pool.

[0009] The liquid storage tank is a liquid metal storage container, is pressurized through a gas charging and discharging branch line covering the liquid storage tank, is connected to a liquid metal out-of-pile circulation pipeline through a liquid metal charging and discharging stop valve, is connected with a drive pump and a liquid metal flowmeter through the liquid metal out-of-pile circulation pipeline, and further comprises an out-of-pile circulation pipeline regulating valve and a drive pump flow valve on the liquid metal out-of-pile circulation pipeline; the liquid metal flowmeter is connected with a calibration barrel through a pipeline; the calibration barrel is connected with an oil cooling heat exchanger; and the detachable dry well is connected with an annular double-layer liquid metal flow pipeline, which comprises an inner layer and an annular outer layer, the inner layer is connected with a preheating heating section through an annular tee joint, and the annular outer layer is connected with the oil cooling heat exchanger through an annular tee joint; the preheating heating section is connected with the drive pump at the lower end.

[0010] The annular tee joint comprises an annular tee joint inner layer and an annular tee joint annular layer, the preheating heating section is connected with the annular tee joint inner layer through a pipeline, and then connected with the inner layer of the annular double-layer liquid metal flow pipeline; the liquid metal heated by the preheating heating section flows through the inner layer of the annular double-layer liquid metal flow pipeline and the innermost layer of the annular tee joint, then flows into the inner layer liquid metal inflow channel of the detachable dry well, and after flowing out of the annular layer liquid metal outflow channel, flows through the annular outer layer of the annular double-layer liquid metal flow pipeline and the annular layer of the annular tee joint, and is connected with the oil cooling heat exchanger.

[0011] The liquid storage tank, the liquid metal out-of-pile circulation pipeline and the annular double-layer liquid metal flow pipeline are wrapped with electric heat tracing.

[0012] Further comprising a drive pump bypass, which is connected between the positions of the out-of-pile circulation pipeline regulating valve and the drive pump flow valve, and the other end of the drive pump, and has a drive pump bypass flow valve on the connecting pipeline, the drive pump bypass is used for auxiliary adjustment of the flow and pressure passing through the drive pump; the drive pump flow valve and the drive pump bypass flow valve jointly adjust the flow and pressure of the liquid metal passing through the drive pump, and disconnect the branch line where the drive pump is located when the drive pump is overhauled.

[0013] The regulating valve in the external circulation pipeline is used to control the flow and pressure of the external liquid metal loop; the drive pump is used to drive the flow of liquid metal in the entire irradiation loop; and the preheating section is used to preheat the liquid metal in the loop to the required temperature for it to flow into the removable dry well.

[0014] The oil-cooled heat exchanger includes a shell side and a tube side. The shell side is connected to an annular layer of an annular tee, and liquid metal flows inside. The tube side is connected to the secondary oil cooling circuit, and cooling oil flows inside. The tube side is used for cooling.

[0015] The calibration tank is the highest point of the liquid metal loop outside the stack. It contains liquid metal and gas space, and several liquid level measuring points are arranged vertically inside to confirm the liquid metal filling height of the loop. The gas space is connected to the gas filling and discharging branch of the calibration tank and is used to fill and discharge the liquid metal in the loop and the pressure stabilizing loop.

[0016] A method for using a thermal device for a liquid metal irradiation test loop in a uranium-hydrogen-zirconium reactor includes the following steps:

[0017] Before running

[0018] S1: Confirm that the reactor pool is airtight and that all valves in the external liquid metal loop are closed;

[0019] The operational preparation phase includes,

[0020] S201: Open the regulating valve of the external circulation pipeline, the flow valve of the drive pump, and the flow valve of the drive pump bypass. Then, replace the inert gas in the storage tank and the irradiation circuit with gas through the gas charging and discharging branch of the storage tank and the gas charging and discharging branch of the calibration tank, respectively. Then close all valves.

[0021] S202: Turn on the electric heat tracing of the liquid storage tank to melt the liquid metal in the tank to the specified temperature, and turn on the electric heat tracing of the liquid metal external circulation pipe and the annular double-layer liquid metal flow pipe to preheat the liquid metal external circuit.

[0022] The steady-state debugging phase includes,

[0023] S301: The gas charging and discharging branch of the storage tank pressurizes the storage tank to meet the operating pressure of the irradiation circuit. Then, the liquid metal charging and discharging shut-off valve, the external circulation pipeline regulating valve, the drive pump flow valve, and the drive pump bypass flow valve are opened in sequence to allow liquid metal to be charged into the external liquid metal circuit.

[0024] S302: Once the preheating section is filled with liquid metal, adjust the heating power of the preheating section so that the outlet liquid metal reaches the required temperature in the detachable dry well, and continue to fill the liquid metal circuit outside the stack with liquid metal.

[0025] S303: When the liquid metal fills the detachable dry well and the external liquid metal circuit, the liquid level in the calibration tank is stabilized at the point where the entire external liquid metal circuit is filled by controlling the pressure difference between the gas filling and discharging branch of the calibration tank and the gas filling and discharging branch covered by the storage tank.

[0026] S304: Turn on the drive pump, simultaneously turn on the secondary side oil cooling circuit, and adjust the temperature and pressure of the irradiation circuit through the drive pump flow valve and the drive pump bypass flow valve.

[0027] In S304, the temperature of the innermost liquid metal inflow channel and the annular liquid metal outflow channel is monitored until the operating steady state condition is reached.

[0028] The significant advantages of this invention are:

[0029] 1. The present invention can arrange a liquid metal flow irradiation circuit in the research reactor for liquid metal irradiation test. The irradiation circuit is divided into two parts: a detachable dry well inside the reactor and a liquid metal circuit outside the reactor. The two parts can be disassembled and assembled independently, which is convenient for replacement and matching different irradiation test conditions.

[0030] 2. The detachable dry well of the present invention is decoupled from the research reactor. The installation, layout and liquid metal flow of the irradiation circuit of the detachable dry well can be carried out independently of the research reactor, which facilitates the routine maintenance and replacement of the irradiation circuit in the detachable dry well as required by the test.

[0031] 3. The liquid metal flow channel inside the detachable dry well of the present invention is a ring-shaped double-layer design, which improves the structural compactness of the detachable dry well and increases the neutron beam flux at the core center.

[0032] In summary, this device is capable of constructing and operating a liquid metal irradiation circuit within the research reactor. The design method is reasonable and the device construction is feasible, making it possible to conduct experimental research on liquid metal irradiation within the research reactor. Attached Figure Description

[0033] Figure 1 This is a front view of the removable dry well and the environment within the stack.

[0034] Figure 2 This is a top view of the detachable dry well and the environment inside the pile.

[0035] Figure 3 This is a schematic diagram of the external liquid metal loop.

[0036] The markings in the diagram and their corresponding component names are as follows:

[0037] Detachable dry well 001, innermost liquid metal inflow channel 002, innermost isolation cylinder 003, annular liquid metal outflow channel 004, annular isolation cylinder 005, air gap layer 006, shielding layer 007, detachable flange 008.

[0038] Reactor pool 101, uranium-hydrogen-zirconium reactor core 102, dry well layout space 103

[0039] 201. Liquid storage tank, 202. Gas charging and discharging branch of liquid storage tank, 203. Liquid metal charging and discharging shut-off valve, 204. Liquid metal external circulation pipeline, 205. Regulating valve of external circulation pipeline, 208. Flow valve of drive pump, 209. Flow valve of drive pump bypass, 206. Drive pump, 207. Drive pump bypass, 210. Preheating section, 211. Innermost layer of annular tee, 212. Annular layer of annular tee, 213. Annular double-layer liquid metal flow pipeline, 214. Oil-cooled heat exchanger, 215. Secondary side oil-cooled circuit, 216. Calibration tank, 217. Gas charging and discharging branch of calibration tank, 218. Liquid metal flow meter. Detailed Implementation

[0040] Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below.

[0041] The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of one or more embodiments of this application. The singular forms “a,” “the,” and “the” used in one or more embodiments of this application and in the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0042] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this application, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this application, and similarly, second may also be referred to as first.

[0043] The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0044] A thermal device for a liquid metal irradiation test loop in a uranium-hydrogen-zirconium reactor includes a removable dry well inside the reactor, an internal environment, and an external liquid metal loop.

[0045] like Figure 1As shown, the removable dry well inside the reactor is a removable part of the irradiation test circuit within the research reactor. It includes the following devices: removable dry well 001, innermost liquid metal inflow channel 002, innermost isolation cylinder 003, annular liquid metal outflow channel 004, annular isolation cylinder 005, air gap layer 006, shielding layer 007, and removable flange 008.

[0046] like Figure 1 , 2 As shown, the reactor environment is a pool-type research reactor environment with detachable dry wells, including the following devices: reactor pool 101, uranium-hydrogen-zirconium reactor core 102, and dry well arrangement space 103.

[0047] like Figure 3 As shown, the external liquid metal loop is used to circulate the liquid metal in the removable dry well, and together with the removable dry well, it forms the irradiation test loop. The included devices are: a liquid storage tank 201, a liquid storage tank covering gas charging and discharging branch 202, a liquid metal charging and discharging shut-off valve 203, a liquid metal external circulation pipeline 204, an external circulation pipeline regulating valve 205, a drive pump flow valve 208, a drive pump bypass flow valve 209, a drive pump 206, a drive pump bypass 207, a preheating section 210, an innermost layer of annular tee 211, annular layer of annular tee 212, annular double-layer liquid metal flow pipeline 213, an oil-cooled heat exchanger 214, a secondary side oil-cooled loop 215, a calibration tank 216, a calibration tank gas charging and discharging branch 217, and a liquid metal flow meter 218.

[0048] The detachable dry well 001 is a liquid metal irradiation circuit part arranged in the reactor core. The detachable dry well 001 is hoisted in the dry well arrangement space 103 and sealed at the top by a detachable flange 008. The detachable dry well 001 is arranged with a high-temperature liquid metal flow channel. The high-temperature liquid metal flows in from the innermost liquid metal inflow channel 002 and flows out from the annular liquid metal outflow channel 004. The two channels are separated by the innermost isolation cylinder 003. The two channels are wrapped and separated by the annular isolation cylinder 005. The annular isolation cylinder 005 is radially outward to form an air gap layer 006, which is used to achieve a temperature gradient from the high-temperature liquid metal channel to the ambient temperature water pool to prevent the cooling water in the uranium-hydrogen-zirconium reactor core 102 from boiling at high temperature. The air gap layer 006 is radially outward to form a shielding layer 007, which is used to shield and concentrate neutrons from the uranium-hydrogen-zirconium reactor core 102.

[0049] The reactor interior environment is the area within the reactor pool where removable dry wells are arranged. The reactor, from the center outwards radially, consists of a removable dry well 001, a dry well arrangement space 103, a uranium-hydrogen-zirconium core 102, and a reactor pool 101. The dry well arrangement space 103 contains no pool water and is completely isolated from the reactor pool 101 along its circumferential height. The uranium-hydrogen-zirconium core 102 is composed of multiple fuel assemblies, and the entire core is submerged in the axial bottom region of the reactor pool 101.

[0050] The external liquid metal loop is a liquid metal irradiation loop section located outside the reactor core, used to maintain the flow of liquid metal in the removable dry well. Its storage tank 201 is a liquid metal storage container, externally wrapped with electric heating to melt the liquid metal. After pressurization via the gas charging / discharging branch 202 covered by the storage tank and control by the liquid metal charging / discharging shut-off valve 203, liquid metal can be charged into the external liquid metal circulation pipe 204, filling the entire irradiation loop. The external liquid metal circulation pipe 204 is externally wrapped with electric heating throughout to prevent liquid metal condensation. The external circulation pipe is adjusted... The throttle valve 205 controls the flow and pressure of the liquid metal loop outside the reactor core; the drive pump 206 drives the flow of liquid metal throughout the irradiation loop; the drive pump bypass 207 assists in regulating the flow and pressure through the drive pump 206; the drive pump flow valve 208 and the drive pump bypass flow valve 209 jointly regulate the flow and pressure of liquid metal through the drive pump 206, and can disconnect the branch where the drive pump 206 is located when the drive pump 206 is under maintenance; the preheating section 210 preheats and heats the liquid metal in the loop to the required temperature for flowing into the removable dry well 001. The heating power is adjustable, and several liquid level measuring points are arranged vertically inside. The heated liquid metal flows through the innermost layer 211 of the annular tee and the innermost layer of the annular double-layer liquid metal flow pipe 213, then flows into the innermost liquid metal inflow channel 002 of the detachable dry well 001, and after flowing out of the annular layer liquid metal outflow channel 004, it flows through the annular layer of the annular double-layer liquid metal flow pipe 213 and the annular layer 212 of the annular tee, and finally flows back to the external liquid metal loop. The annular double-layer liquid metal flow pipe 213 is wrapped with electric heat tracing. The oil-cooled heat exchanger 214 is used to cool liquid metal, with liquid metal flowing on the shell side and cooling oil flowing on the pipe side. The pipe side is connected to the secondary oil-cooled circuit 215 to prevent the oil from overheating and boiling. The calibration tank 216 is the highest point of the external liquid metal circuit. It consists of liquid metal and gas space. Several liquid level measuring points are arranged vertically inside to confirm the liquid metal filling height of the circuit. In addition, the calibration tank gas filling and discharging branch 217 is used to fill and discharge the liquid metal in the circuit and the pressure stabilizing circuit. The liquid metal flow meter 218 is used to monitor the real-time flow of the external liquid metal circuit.

[0051] Before operation, the thermal design method and apparatus for the liquid metal irradiation test loop of the uranium-hydrogen-zirconium reactor described above shall be used to ensure that: 1) the removable dry well 001 inside the reactor is correctly installed inside the dry well arrangement space 103 and the removable flange 008 is correctly sealed; 2) the reactor pool 101 and the uranium-hydrogen-zirconium reactor core 102 in the reactor arrangement environment are in steady-state operation; 3) the pressure-bearing boundary of the liquid metal loop outside the reactor is intact and the airtightness is good; and 4) all valves are closed.

[0052] During the operation preparation phase, 1) open the external circulation pipeline regulating valve 205, drive pump flow valve 208, and drive pump bypass flow valve 209, and replace the inert gas in the storage tank 201 and irradiation circuit through the gas charging and discharging branch 202 and calibration tank gas charging and discharging branch 217, respectively, and then close all valves; 2) turn on the electric heat tracing of the storage tank 201 to melt the liquid metal in the storage tank 201 to the specified temperature, and turn on the electric heat tracing of the liquid metal external circulation pipeline 204 and the annular double-layer liquid metal flow pipeline 213 to preheat the external liquid metal circuit.

[0053] During the steady-state commissioning phase, 1) the gas filling and emptying branch 202 of the storage tank pressurizes the storage tank 201 to meet the operating pressure of the irradiation circuit. Then, the liquid metal filling and emptying shut-off valve 203, the external circulation pipeline regulating valve 205, the drive pump flow valve 208, and the drive pump bypass flow valve 209 are opened sequentially and slowly to allow liquid metal to gradually fill the external liquid metal circuit; 2) once the liquid metal fills the preheating section 210, the heating power of the preheating section 210 is slowly adjusted so that the outlet liquid metal reaches the required temperature in the removable dry well 001, and liquid metal continues to be slowly filled into the external liquid metal circuit; 3) once the liquid metal fills the removable dry well 001... When disassembling the dry well 001 and the external liquid metal circuit, observe the liquid level of the calibration tank 216, and stabilize the liquid level of the calibration tank 216 at the point where it fills the entire irradiation circuit by controlling the pressure difference between the gas charging and discharging branch 217 of the calibration tank and the gas charging and discharging branch 202 covered by the storage tank; 4) turn on the drive pump 206 and gradually adjust the drive pump 206 to the steady-state operating power, simultaneously turn on the secondary side oil cooling circuit 215, and adjust the temperature and pressure of the irradiation circuit through the drive pump flow valve 208 and the drive pump bypass flow valve 209, and monitor the temperature of the innermost liquid metal inflow channel 002 and the annular liquid metal outflow channel 004 to the steady-state operating condition.

[0054] The flow sequence of the working fluid involved is described as follows:

[0055] For liquid metal, the liquid metal is stored in storage tank 201. After the storage tank 201 is pressurized by the gas filling and discharging branch 202 covering the storage tank, the liquid metal is filled into the liquid metal external circulation pipeline 204 through the liquid metal filling and discharging shut-off valve 203 and the external circulation pipeline regulating valve 205. The filled liquid metal sequentially submerges the drive pump flow valve 208, drive pump bypass flow valve 209, drive pump 206, drive pump bypass 207, and preheating section 210 from bottom to top. Subsequently, the liquid metal is filled... The liquid enters the innermost layer 211 of the annular double-layer liquid metal flow pipe 213, and flows down the pipe from the innermost liquid metal inflow channel 002 to the annular layer liquid metal outflow channel 004, and then flows out to the annular layer 212 of the annular double-layer liquid metal flow pipe 213, and then sequentially enters the oil-cooled heat exchanger 214, the calibration tank 216, and the liquid metal flow meter 218, finally filling the entire device, and the highest point liquid level is controlled by the calibration tank 216.

[0056] The cooling oil circulates directly through the secondary oil cooling circuit 215 and cools the oil cooling heat exchanger 214. The secondary oil cooling circuit 215 can be connected to a standardized oil-cooled temperature control outdoor unit.

[0057] For inert gases, they are stored in standardized inert gas filling and discharging equipment. When it is necessary to pressurize the liquid storage tank 201, the inert gas is filled into the gas space above it through the gas filling and discharging branch 202 covering the liquid storage tank; when it is necessary to pressurize the liquid metal device and control the highest point liquid level, the inert gas is filled into the gas space above the calibration tank 216 through the calibration tank gas filling and discharging branch 217.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0059] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0060] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0061] The preferred embodiments disclosed above are merely illustrative of this application. The optional embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this application. These embodiments are selected and specifically described in this application to better explain the principles and practical applications of this application, thereby enabling those skilled in the art to better understand and utilize this application.

Claims

1. A thermal device for a liquid metal irradiation test loop in a uranium-hydrogen-zirconium reactor, characterized in that: It includes a detachable dry well (001), an in-pile environment, and an external liquid metal loop; the detachable dry well (001) is located in the in-pile environment and is connected to an oil-cooled heat exchanger (214), a calibration tank (216), a liquid metal flow meter (218), a drive pump (206), a drive pump bypass (207), and a preheating section (210) through pipelines to form an irradiation loop.

2. The thermal device for a liquid metal irradiation test loop in a uranium-hydrogen-zirconium reactor according to claim 1, characterized in that: The detachable dry well (001) is hoisted in the dry well arrangement space (103) and the top is sealed by the detachable flange (008). The detachable dry well (001) is arranged with a high temperature liquid metal flow channel. The high temperature liquid metal flows in from the innermost liquid metal inflow channel (002) and flows out from the annular liquid metal outflow channel (004). The two channels are separated by the innermost isolation cylinder (003). The two channels are wrapped and separated by the annular isolation cylinder (005). The annular isolation cylinder (005) is radially outward to form an air gap layer (006), and the air gap layer (006) is radially outward to form a shielding layer (007).

3. The thermal device for a liquid metal irradiation test loop in a uranium-hydrogen-zirconium reactor according to claim 2, characterized in that: The in-reactor environment includes a reactor pool (101), a uranium-hydrogen-zirconium reactor core (102), and a dry well arrangement space (103); the detachable dry well (001) is located in the dry well arrangement space (103), and the uranium-hydrogen-zirconium reactor core (102) and the reactor pool (101) are located outside the dry well arrangement space (103).

4. The thermal device for a liquid metal irradiation test loop in a uranium-hydrogen-zirconium reactor according to claim 3, characterized in that: The dry well layout space (103) is circumferentially and fully isolated from the reactor pool (101); the uranium-hydrogen-zirconium reactor core (102) includes multiple fuel assemblies and is completely submerged in the reactor pool (101).

5. The thermal device for a liquid metal irradiation test loop in a uranium-hydrogen-zirconium reactor according to claim 4, characterized in that: The storage tank (201) is a liquid metal storage container. It is pressurized via a gas filling / discharging branch (202) and connected to an external circulation pipeline (204) for the liquid metal stack via a liquid metal filling / discharging shut-off valve (203). The external circulation pipeline (204) connects a drive pump (206) and a liquid metal flow meter (218). The external circulation pipeline (204) also includes an external circulation pipeline regulating valve (205), a drive pump flow valve (208), and a liquid metal flow meter (218). 8) Connect the calibration bucket (216) via pipeline; the calibration bucket (216) is connected to the oil-cooled heat exchanger (214); and the detachable dry well (001) is connected to the annular double-layer liquid metal flow pipeline (213), which includes an inner layer and an annular outer layer pipeline, and the inner layer is connected to the preheating section (210) via an annular tee, and the annular outer layer is connected to the oil-cooled heat exchanger (214) via an annular tee; the lower end of the preheating section (210) is connected to the drive pump (206).

6. The thermal device for a liquid metal irradiation test loop in a uranium-hydrogen-zirconium reactor according to claim 5, characterized in that: The annular tee includes an inner layer (211) and an annular layer (212). The preheating section (210) is connected to the inner layer (211) of the annular tee through a pipeline, and then to the inner layer of the annular double-layer liquid metal flow pipe (213). The liquid metal heated by the preheating section (210) flows through the innermost layer (211) of the annular tee and the inner layer of the annular double-layer liquid metal flow pipe (213), and then flows into the inner liquid metal inflow channel (002) of the detachable dry well (001). After flowing out of the annular layer liquid metal outflow channel (004), it flows through the outer annular layer of the annular double-layer liquid metal flow pipe (213) and the annular layer (212) of the annular tee, and is connected to the oil-cooled heat exchanger (214).

7. The thermal device for a liquid metal irradiation test loop in a uranium-hydrogen-zirconium reactor according to claim 6, characterized in that: The liquid storage tank (201), the liquid metal stack external circulation pipe (204), and the annular double-layer liquid metal flow pipe (213) are all wrapped with electric heat tracing.

8. The thermal device for a liquid metal irradiation test loop in a uranium-hydrogen-zirconium reactor according to claim 7, characterized in that: It also includes a drive pump bypass (207), which connects the position between the external circulation pipeline regulating valve (205) and the drive pump flow valve (208), and the other end of the drive pump (206), and there is a drive pump bypass flow valve (209) on the connecting pipeline. The drive pump bypass (207) is used to assist in regulating the flow and pressure through the drive pump (206); the drive pump flow valve (208) and the drive pump bypass flow valve (209) jointly regulate the flow and pressure of liquid metal through the drive pump (206), and disconnect the branch where the drive pump (206) is located when the drive pump (206) is under maintenance.

9. A thermal device for a liquid metal irradiation test loop in a uranium-hydrogen-zirconium reactor according to claim 5, characterized in that: The external circulation pipeline regulating valve (205) is used to control the flow and pressure of the external liquid metal loop; the drive pump (206) is used to drive the flow of liquid metal in the entire irradiation loop; and the preheating section (210) is used to preheat the liquid metal in the loop to the required temperature for it to flow into the removable dry well (001).

10. A thermal device for a liquid metal irradiation test loop in a uranium-hydrogen-zirconium reactor according to claim 5, characterized in that: The oil-cooled heat exchanger (214) includes a shell side and a tube side. The shell side is connected to an annular three-way annular layer (212) and liquid metal flows inside. The tube side is connected to the secondary oil cooling circuit (215) and cooling oil flows inside. The tube side is used for cooling.

11. The thermal device for a liquid metal irradiation test loop in a uranium-hydrogen-zirconium reactor according to claim 5, characterized in that: The calibration barrel (216) is the highest point of the liquid metal circuit outside the stack. It includes liquid metal and gas space, and several liquid level measuring points are arranged vertically inside it to confirm the liquid metal filling height of the circuit. The gas space is connected to the calibration barrel gas filling and discharging branch (217) to fill and discharge the liquid metal of the circuit and the pressure stabilizing circuit.

12. A method of using a thermal device for a liquid metal irradiation test loop in a uranium-hydrogen-zirconium reactor, employing the device as described in claim 8, characterized in that: Includes the following steps: Before running S1: Confirm that the reactor pool (101) is airtight and that all valves in the external liquid metal loop are closed; The operational preparation phase includes, S201: Open the external circulation pipeline regulating valve (205), drive pump flow valve (208), and drive pump bypass flow valve (209), and replace the inert gas in the storage tank (201) and irradiation circuit through the storage tank cover gas charging and discharging branch (202) and calibration tank gas charging and discharging branch (217), respectively, and then close all valves; S202: Turn on the electric heat tracing of the liquid storage tank (201) to melt the liquid metal in the liquid storage tank (201) to the specified temperature, and turn on the electric heat tracing of the liquid metal external circulation pipe (204) and the annular double-layer liquid metal flow pipe (213) to preheat the liquid metal external circuit. The steady-state debugging phase includes, S301: The gas charging and discharging branch (202) of the storage tank pressurizes the storage tank (201) to meet the operating pressure of the irradiation circuit. Then, the liquid metal charging and discharging shut-off valve (203), the external circulation pipeline regulating valve (205), the drive pump flow valve (208), and the drive pump bypass flow valve (209) are opened in sequence to allow liquid metal to be charged into the external liquid metal circuit. S302: After the liquid metal fills the preheating section (210), adjust the heating power of the preheating section (210) so that the liquid metal at its outlet reaches the required temperature in the detachable dry well (001), and continue to fill the liquid metal circuit outside the stack with liquid metal. S303: When the liquid metal fills the detachable dry well (001) and the external liquid metal circuit, the liquid level in the calibration tank (216) is stabilized at the point where the entire external liquid metal circuit is filled by controlling the pressure difference between the calibration tank gas filling and discharging branch (217) and the storage tank covered gas filling and discharging branch (202). S304: Turn on the drive pump (206), simultaneously turn on the secondary side oil cooling circuit (215), and adjust the temperature and pressure of the irradiation circuit through the drive pump flow valve (208) and the drive pump bypass flow valve (209).

13. The method of using the thermal device for a liquid metal irradiation test loop in a uranium-hydrogen-zirconium reactor according to claim 12, characterized in that: In S304, the temperature of the innermost liquid metal inflow channel (002) and the annular liquid metal outflow channel (004) is monitored until the operating steady state condition is reached.

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