Molten salt micro reactor core power supply structure

Abstract

The utility model discloses a fused salt micro-reactor nuclear power source structure which comprises a nuclear power source body and a fused salt containing layer arranged on the outer side of the nuclear power source body. The nuclear power source body comprises a reactor core circumferential reflection layer, a reactor core top reflection layer, a power control mechanism, a bottom support, a Stirling engine, a reactor core moderation area, a reactor core bottom collection area, a reactor core top collection area and a circulation channel. The Stirling engine of the fused salt micro reactor nuclear power source structure is high in single-machine power, a fused salt medium can be directly used, an intermediate heat exchange system is reduced, and the size and the weight of the system are greatly reduced. The molten salt micro reactor core power supply structure operates in a natural circulation mode, a main pump is not arranged, a main loop operates reliably, most of molten salt is discharged to a molten salt containing layer outside the reactor after the reactor is shut down, and the system is simple and reliable. Meanwhile, after the molten salt micro reactor core power supply structure is shut down, most of the molten salt is in the molten salt accommodating layer and can be directly discharged through heat conduction, and a residual discharge system is simple.

Description

Technical Field

[0001] This utility model relates to the field of advanced nuclear energy microreactor nuclear power sources, and in particular to a molten salt microreactor nuclear power source structure. Background Technology

[0002] Hundred-kilowatt-class nuclear power sources have significant applications in space, deep sea, and land-based stationary and mobile power systems, enabling long-term unattended operation. Currently, heat pipe reactors are a popular type of small nuclear power reactor, offering significant advantages at low power levels, such as the absence of moving parts in the heat pipes and high safety and reliability. Furthermore, with ongoing efforts both domestically and internationally, heat pipe reactors have moved from concept to practical application. However, as research deepens, various problems with heat pipe reactors are gradually emerging, such as difficulties in heat pipe installation and maintenance, heat pipe and Stirling connection issues, heat pipe power enhancement, and nuclear thermocoupling.

[0003] Traditional molten salt reactors typically feature an intermediate loop and a relatively complex power generation system loop, resulting in a large overall power output. They are generally designed for commercial power plants. With the increasing development of low-power microreactors, some research institutions are also considering molten salt reactors, for example, combining them with heat pipes. However, the heat pipes are directly inserted into the molten salt. Since the heat pipes are generally at a constant temperature in steady state, the molten salt remains almost static. Given the poor thermal conductivity of molten salt, the local temperature could exceed 1000°C, posing a potential safety risk. Furthermore, the heat pipes, as intermediate heat exchangers, increase the system's size and weight. Some designs eliminate the intermediate loop, using a secondary loop for direct power generation, such as supercritical carbon dioxide systems. However, these systems generally have high power output, requiring a main pump as the power source and a large main heat exchanger. This undoubtedly increases the system's complexity and weight, and reduces its passive safety.

[0004] Compared to static heat conduction in molten salt, making molten salt flow can significantly improve its heat exchange capacity. However, molten salt has high viscosity, and its natural circulation capability is generally not particularly good. Since the outlet temperature of the molten salt pile is relatively high, if a certain temperature difference is sacrificed to compensate for the shortcomings of natural circulation, a good effect can be achieved. Free-piston Stirling engines are small in size, lightweight, stable, and have a long service life; however, currently, due to the limited contact area of ​​the heat head, it is difficult to increase their power output, especially given the challenges in designing and installing hard contact with heat pipes. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a molten salt microreactor core power supply structure.

[0006] The technical solution adopted by this utility model to solve its technical problem is: to construct a molten salt microreactor nuclear power supply structure, which includes a nuclear power supply body and a molten salt containment layer arranged on the outside of the nuclear power supply body.

[0007] The nuclear power source body includes a core circumferential reflector, a core top reflector, a power control mechanism, a bottom support, a Stirling engine, a core moderation zone, a core bottom collection zone, a core top collection zone, and a flow channel.

[0008] The power control mechanism is disposed in the circumferential reflector of the reactor core, the reactor core moderation zone is provided with a moderator, the bottom support is disposed below the reactor core moderation zone and is used to support the moderator, the reactor core bottom collection zone is disposed below the bottom support, the reactor core top collection zone is disposed between the reactor core top reflector and the reactor core moderation zone, and the Stirling engine is disposed above the reactor core top reflector.

[0009] Molten salt flows through the bottom support, the Stirling engine, the bottom core collection area, the top core collection area, and the flow channel.

[0010] In some embodiments, the flow channels include molten salt channels, a channel in the middle of the top reflector layer of the core, a chimney channel, a transition channel, a channel at the edge of the top reflector layer of the core, a channel around the core moderation zone, and a channel around the bottom support; the molten salt channels are located in the core moderation zone;

[0011] Under normal operating conditions, after the molten salt releases heat in the molten salt channel, it flows sequentially through the top core collection area, the middle channel of the top core reflector layer, the chimney channel, the transition channel, the Stirling engine, the edge channel of the top core reflector layer, the channel around the core moderation zone, the outer channel of the bottom support, and the bottom core collection area before flowing back to the molten salt channel through the bottom support.

[0012] In some embodiments, the central channel of the top reflector layer is located in the middle of the top reflector layer, the chimney channel is located above the central channel of the top reflector layer, and the transition channel is located between the chimney channel and the Stirling engine.

[0013] In some embodiments, the edge channel of the top core reflector is located at the periphery of the top core reflector, the channel around the core moderation zone is located between the core moderation zone and the core circumferential reflector and below the edge channel of the top core reflector, and the peripheral channel of the bottom support is located at the periphery of the bottom support.

[0014] In some embodiments, both the molten salt containment layer and the nuclear power source body are equipped with an inert gas control system.

[0015] In some embodiments, both the molten salt containment layer and the nuclear power source body are provided with gas storage tanks.

[0016] In some embodiments, the power control mechanism includes a control drum, the effective portion of which extends from the bottom of the nuclear power source body to above the molten salt surface of the nuclear power source body, and the effective portion of the control drum is an absorption surface.

[0017] In some embodiments, the moderator has a cylindrical structure.

[0018] In some embodiments, the bottom collection area of ​​the core is provided with a flow distributor.

[0019] In some embodiments, the number of Stirling engines is multiple, and the multiple Stirling engines are arranged separately along the circumferential direction of the top reflector layer of the reactor core.

[0020] In some embodiments, the molten salt microreactor nuclear power structure further includes an outer casing disposed outside the molten salt containment layer.

[0021] The advantages of implementing this invention are as follows: The Stirling engine in this molten salt microreactor nuclear power structure has high single-unit power and can directly use molten salt as the medium, reducing the intermediate heat exchange system and significantly lowering the system volume and weight. Furthermore, this molten salt microreactor nuclear power structure operates in a natural circulation mode, without a main pump, ensuring reliable main circuit operation. After reactor shutdown, most of the molten salt is discharged to the molten salt containment layer outside the reactor core, making the system simple and reliable. Simultaneously, after reactor shutdown, most of the molten salt remains in the molten salt containment layer and can be directly discharged through heat conduction, simplifying the waste discharge system. This molten salt microreactor nuclear power structure isolates the core moderation zone from the Stirling engine, preventing the Stirling engine from being located in the strong radiation field of the reactor core, thus improving reactor operating power. Attached Figure Description

[0022] To more clearly illustrate the technical solution of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of the nuclear power source body in some embodiments of this utility model;

[0024] Figure 2 This is a schematic diagram of the overall structure of the molten salt microreactor nuclear power source structure in some embodiments of this utility model. Detailed Implementation

[0025] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0026] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0027] See Figure 1 and Figure 2This invention relates to a molten salt microreactor nuclear power supply structure in some embodiments of the present invention. Specifically, it pertains to the field of advanced nuclear energy microreactors, specifically a microreactor system using molten salt as the medium. The core outlet temperature is approximately 700°C, and the nuclear power output ranges from tens to hundreds of kW. The molten salt microreactor nuclear power supply structure includes a nuclear power supply body 1 and a molten salt containment layer 2 arranged outside the nuclear power supply body 1. The nuclear power supply body 1 includes a core circumferential reflector layer 11, a core top reflector layer 12, a power control mechanism 13, a bottom support 14, a Stirling engine 15, a core moderation zone 16, a core bottom collection zone 17, a core top collection zone 18, and a flow channel 19. The power control mechanism 13 is located within the circumferential reflector layer 11 of the reactor core. A moderator 16 is disposed in the core moderation zone 16. A bottom support 14 is located below the core moderation zone 16 and supports the moderator 161. A bottom core collection zone 17 is located below the bottom support 14. A top core collection zone 18 is located between the top core reflector layer 12 and the core moderation zone 16. The Stirling engine 15 is located above the top core reflector layer 12. Molten salt flows through the bottom support 14, the Stirling engine 15, the bottom core collection zone 17, the top core collection zone 18, and the flow channel 19.

[0028] Furthermore, the flow channel 19 includes a molten salt channel 191, a channel 192 in the middle of the top reflector layer of the core, a chimney channel 193, a transition channel 194, a channel 195 at the edge of the top reflector layer of the core, a channel 196 around the core moderation zone, and a channel 197 on the periphery of the bottom support. Under normal operating conditions, after the molten salt releases heat in the molten salt channel 191, it sequentially flows through the top core collection area 18, the channel 192 in the middle of the top reflector layer of the core, the chimney channel 193, the transition channel 194, the Stirling engine 15, the edge of the top reflector layer of the core 195, the channel 196 around the core moderation zone, the channel 197 on the periphery of the bottom support, and the bottom core collection area 17 before flowing back to the molten salt channel 191 via the bottom support 14.

[0029] The molten salt channel 191 is located in the core moderation zone 16. The central channel 192 of the top core reflector is located in the middle of the top core reflector 12. The chimney channel 193 is located above the central channel 192 of the top core reflector. The transition channel 194 is located between the chimney channel 193 and the Stirling engine 15. The edge channel 195 of the top core reflector is located around the top core reflector 12. The channel 196 around the core moderation zone is located between the core moderation zone 16 and the core circumferential reflector 11 and is located below the edge channel 195 of the top core reflector. The peripheral channel 197 of the bottom support is located around the bottom support 14.

[0030] Specifically, the circumferential reflector 11 and the top reflector 12 of the reactor core are both reflector layers of the nuclear power source body 1, mainly used to improve the neutron utilization rate of the reactor core by reflecting neutrons. The materials are similar to those of typical molten salt reactor reflector layers, such as graphite. The top reflector 12 of the reactor core has a channel in the middle for molten salt to flow out of the reactor core, which is the middle channel 192 of the top reflector layer of the reactor core. The top reflector 12 of the reactor core has multiple through holes around its periphery for downward flow channels 19 of molten salt, which are the edge channels 195 of the top reflector layer of the reactor core.

[0031] The Stirling engine 15 refers to a free-piston thermoacoustic Stirling engine that uses molten salt as a heat source. This Stirling engine 15 has high single-unit power and can directly use molten salt as the heat transfer medium, reducing intermediate heat exchange systems and significantly lowering system volume and weight. In this embodiment, multiple Stirling engines 15 are arranged circumferentially along the top reflector layer 12 of the reactor core. The multiple Stirling engines 15 are arranged on top of the nuclear power unit 1, allowing for circumferential arrangement based on the dimensions of the reactor core and the Stirling engines 15, achieving a compact layout. Furthermore, the Stirling engines 15 are isolated from the bottom of the nuclear power unit 1. The graphite isolation layer of the nuclear power unit 1 reflects neutrons, improving the neutron utilization efficiency of the reactor core, and also provides shielding, preventing the Stirling engines 15 from being located in the strong radiation field of the reactor core.

[0032] The nuclear power source body 1 performs functions such as molten salt flow, moderation, and molten salt fission reaction. In the core moderation zone 16, moderator 161 moderates neutrons, enabling the molten salt to undergo a critical nuclear reaction within the core moderation zone 16. Simultaneously, the flowing molten salt carries away the heat generated by the nuclear reaction. Since the fuel in a liquid molten salt reactor is directly mixed in the molten salt medium, the molten salt in the nuclear power source body 1 serves as both fuel and coolant. The molten salt is a mixture of fluoride salts and uranium fluoride, typical of molten salt reactors. To reduce the core critical volume, the uranium enrichment can be appropriately increased. The moderator 161 material includes, but is not limited to, beryllium oxide, graphite, and other moderation materials that can be used in molten salt reactors. Moderator 161 has a cylindrical structure. The main function of moderator 161 is to moderate neutrons to facilitate the nuclear reaction of the surrounding fuel. Molten salt flow channel 191 is located in the core moderation zone 16. This molten salt flow channel 191 is a through-channel of moderator 161, providing a pathway for molten salt flow and nuclear reaction.

[0033] The bottom support 14 is a structure that supports the moderator 161, and the peripheral channel 197 of the bottom support 14 is located around the bottom support 14. The bottom support 14 has multiple through holes on its edge for the downward flow of molten salt, and this downward flow channel of molten salt is the peripheral channel 197 of the bottom support. The bottom support 14 has a low temperature and can be made of a nickel-based alloy material suitable for molten salt reactors.

[0034] The bottom collection area 17 of the reactor core specifically refers to the empty space below the bottom support 14. This area is where molten salt collects after descending from the outer channel 197 of the bottom support. The bottom collection area 17 of the reactor core is equipped with a flow distributor to regulate the flow rate of the molten salt.

[0035] The core top collection area 18 specifically refers to the blank space between the core top reflector layer 12 and the core moderation zone 16. This area mainly collects molten salt flowing out of the core moderation zone 16.

[0036] The power control mechanism 13 includes a control drum. The effective portion of the control drum extends from the bottom of the nuclear power source 1 to above the molten salt surface of the nuclear power source 1, and all effective portions of the control drum are absorbing surfaces. This control drum can control the power of the nuclear power source 1 through the absorbing and reflecting surfaces. The effective portions of the control drum are all designed as absorbing surfaces to effectively control the reactivity of the molten salt above the top reflector layer 12 of the reactor core, keeping it in an absolutely subcritical state and protecting the Stirling engine 15 from high-dose radiation.

[0037] The molten salt containment layer 2 is located outside the nuclear power unit 1. A pressure vessel layer, slightly larger than the nuclear power unit 1, is located outside the nuclear power unit 1. The cavity between this pressure vessel layer and the nuclear power unit 1 is the molten salt containment layer 2. The molten salt containment layer 2 and the nuclear power unit 1 are connected through an opening at the bottom of the nuclear power pressure vessel. The molten salt level in the molten salt containment layer 2 is controlled by gas pressure. Both the molten salt containment layer 2 and the nuclear power unit 1 are equipped with inert gas control systems and gas storage tanks. These inert gas control systems are used to control the molten salt level throughout the entire molten salt microreactor nuclear power structure. During reactor shutdown, gas is released into the corresponding gas storage tank in the molten salt containment layer 2 to reduce pressure, and compressed gas is injected into the corresponding gas storage tank in the nuclear power unit 1, thereby forcing molten salt from the reactor into the molten salt containment layer 2 to achieve reactor shutdown.

[0038] In addition, the chimney passage 193 is located above the middle passage 192 of the top reflector layer of the reactor core, at the top of the nuclear power source body 1, which can effectively improve the natural circulation capability and enhance the reactor's operating power.

[0039] The molten salt microreactor nuclear power structure also includes an outer shell 3 located outside the molten salt containment layer 2, which can directly conduct heat outward through the outer shell 3 to release the residual heat of the reactor core.

[0040] The specific application of this molten salt microreactor nuclear power structure is as follows: This molten salt microreactor adopts a liquid molten salt reactor mode. The molten salt is moderated by moderator 161 to increase the nuclear reaction cross section and reduce the core volume. Under normal operating conditions, after the molten salt releases heat from the nuclear reaction in the core moderation zone 16, it flows upward through the core top collection zone 18, through the central channel 192 of the core top reflector layer and the chimney channel 193, and then flows to the transition channel 194. The chimney channel 193 can effectively increase the natural circulation height of the primary loop, thereby improving the natural circulation capability. The molten salt then flows into the Stirling engine 15 from the transition channel 194. The molten salt is cooled by flowing through the Stirling engine 15, and the Stirling engine 15 absorbs heat to perform work and output power. Then, the molten salt enters the core bottom collection zone 17 through the edge channel 195 of the core top reflector layer, the channel around the core moderation zone 196, and the outer channel of the bottom support 197. Finally, it turns around and flows upward again into the molten salt flow channel 191 in the core moderation zone 16. During the cycle, the power control mechanism 13 controls the system power according to the power requirements.

[0041] When a reactor shutdown is required, the power control mechanism 13 can control the reactivity to reduce the reactor power until shutdown. Then, by increasing the gas pressure in the upper part of the nuclear power source body 1, molten salt is forced into the molten salt containment layer 2. The bottom of the nuclear power source body 1 has openings to ensure molten salt flow. Due to the small and dispersed gaps in the molten salt containment layer 2, and the absence of a moderator 161, the molten salt cannot reach criticality. The outer shell 3 of the molten salt containment layer 2 allows for direct heat conduction outwards, releasing residual core heat.

[0042] When the reactor is turned on, gas is pressurized on the upper part of the molten salt containment layer 2 to force the molten salt into the nuclear power source body 1, and the power is increased to the target power by the power control mechanism 13.

[0043] This molten salt microreactor nuclear power structure, with its relatively low total power output, combines molten salt with a Stirling engine to leverage the strengths of both systems. Furthermore, at low power levels, residual heat can be safely removed via the reactor's own thermal conductivity, significantly reducing system complexity. This molten salt microreactor nuclear power structure utilizes existing, mature materials, equipment, and processes as much as possible. With a relatively low core power density, it achieves a 100-kilowatt-level molten salt microreactor nuclear power solution through methods such as primary loop natural circulation, passive residual heat removal, increasing the natural circulation height to enhance its capacity, sacrificing some heat exchange temperature difference for equipment miniaturization, and molten salt removal for reactor shutdown.

[0044] The beneficial effects of this molten salt microreactor nuclear power source structure are:

[0045] 1. This molten salt microreactor nuclear power source structure utilizes the excellent power-to-weight ratio of molten salt reactors to reduce the size and weight of the microreactor nuclear power source;

[0046] 2. The Stirling engine 15 is a free piston thermoacoustic engine. This Stirling engine 15 has a large single-unit power and can directly use molten salt medium, reducing the intermediate heat exchange system and significantly reducing the system size and weight.

[0047] 3. This molten salt microreactor nuclear power structure does not have fuel or material development issues. Currently, fuel and material development is a major obstacle to the development of advanced reactors. Fuel can be directly mixed into the molten salt medium.

[0048] 4. This molten salt microreactor nuclear power supply structure operates in a natural circulation mode, without a main pump, and the main circuit operates reliably;

[0049] 5. After the molten salt microreactor nuclear power plant is shut down, most of the molten salt is discharged to the molten salt containment layer 2 outside the reactor, making the system simple and reliable;

[0050] 6. This molten salt microreactor nuclear power plant structure uses molten salt venting for shutdown, eliminating the need for an additional shutdown system. Furthermore, the shutdown system employs venting / injection of inert gas, making the system simple and reliable.

[0051] 7. After the molten salt microreactor nuclear power structure is shut down, most of the molten salt is in the molten salt containment layer 2, which can be directly discharged through heat conduction, and the residual discharge system is simple;

[0052] 8. The molten salt microreactor nuclear power structure isolates the core moderation zone 16 from the Stirling engine 15. The graphite isolation layer on top of the nuclear power body 1 can reflect neutrons to improve the core neutron utilization efficiency and also has a shielding effect, so that the Stirling engine 15 is not in the strong radiation field of the core.

[0053] 9. Chimney passage 193 can effectively improve natural circulation capacity and enhance reactor operating power;

[0054] 10. The Stirling engine 15 is arranged on top of the nuclear power unit 1 and can be arranged circumferentially according to the size of the nuclear power unit 1 and the Stirling engine 15 to achieve a compact layout.

[0055] 11. Compared with the current high-temperature gas-cooled reactor core based on TRISO fuel, the core volume of this molten salt microreactor nuclear power structure can be significantly reduced;

[0056] 12. The molten salt microreactor nuclear power source structure uses a control drum to control reactivity. The upper part of the control drum in the active region adopts a full absorption design, which can effectively prevent the part above the active region from reaching criticality, thereby effectively reducing the radiation of the Stirling engine 15 region.

[0057] 13. The molten salt microreactor nuclear power source adopts a pool-type structure with almost no connecting pipes, which greatly reduces the risk of breach;

[0058] 14. The molten salt microreactor nuclear power plant structure adopts an atmospheric pressure design, which significantly reduces the design and manufacturing requirements of the pressure vessel, as well as the cost and weight.

[0059] 15. The molten salt microreactor nuclear power structure adopts an integrated design, eliminating main equipment such as the main pump and main heat exchanger, making the system simple;

[0060] 16. The center of gravity of this molten salt microreactor nuclear power source structure is located at the bottom of the nuclear power source body 1, resulting in high stability;

[0061] 17. The outlet temperature of this molten salt microreactor nuclear power source reaches about 700℃, which is high and results in high system efficiency;

[0062] 18. The nuclear power source of this molten salt microreactor nuclear power source structure can be flexibly designed according to specific power requirements.

[0063] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A molten salt microreactor core power source structure, characterized in that, It includes a nuclear power source body (1) and a molten salt containment layer (2) arranged outside the nuclear power source body (1); The nuclear power source body (1) includes a core circumferential reflector (11), a core top reflector (12), a power control mechanism (13), a bottom support (14), a Stirling engine (15), a core moderation zone (16), a core bottom collection zone (17), a core top collection zone (18), and a flow channel (19). The power control mechanism (13) is disposed in the circumferential reflector layer (11) of the core, the core moderation zone (16) is provided with a moderator (161), the bottom support (14) is disposed below the core moderation zone (16) and is used to support the moderator (161), the core bottom collection zone (17) is disposed below the bottom support (14), the core top collection zone (18) is disposed between the core top reflector layer (12) and the core moderation zone (16), and the Stirling engine (15) is disposed above the core top reflector layer (12). Molten salt flows through the bottom support (14), the Stirling engine (15), the bottom core collection area (17), the top core collection area (18), and the flow channel (19).

2. The molten salt microreactor nuclear power source structure according to claim 1, characterized in that, The flow channel (19) includes a molten salt channel (191), a channel in the middle of the top reflector layer of the core (192), a chimney channel (193), a transition channel (194), a channel at the edge of the top reflector layer of the core (195), a channel around the core moderation zone (196), and a channel around the bottom support (197); the molten salt channel (191) is located in the core moderation zone (16); Under normal operating conditions, after the molten salt releases heat in the molten salt channel (191), it sequentially flows through the top core collection area (18), the middle channel of the top core reflector (192), the chimney channel (193), the transition channel (194), the Stirling engine (15), the edge channel of the top core reflector (195), the channel around the core moderation zone (196), the outer channel of the bottom support (197), and the bottom core collection area (17), before flowing back to the molten salt channel (191) through the bottom support (14).

3. The molten salt microreactor nuclear power source structure according to claim 2, characterized in that, The central channel (192) of the top reflector layer of the reactor core is located in the middle of the top reflector layer (12) of the reactor core, the chimney channel (193) is located above the central channel (192) of the top reflector layer of the reactor core, and the transition channel (194) is located between the chimney channel (193) and the Stirling engine (15).

4. The molten salt microreactor nuclear power source structure according to claim 2, characterized in that, The edge channel (195) of the top reflector layer of the core is located around the top reflector layer (12) of the core. The channel (196) around the core moderation zone is located between the core moderation zone (16) and the core circumferential reflector layer (11) and below the edge channel (195) of the top reflector layer of the core. The peripheral channel (197) of the bottom support is located around the bottom support (14).

5. The molten salt microreactor nuclear power source structure according to claim 1, characterized in that, Both the molten salt containment layer (2) and the nuclear power source body (1) are equipped with an inert gas control system and a gas storage tank.

6. The molten salt microreactor nuclear power source structure according to claim 1, characterized in that, The power control mechanism (13) includes a control drum, the effective part of which extends from the bottom of the nuclear power source body (1) to above the molten salt surface of the nuclear power source body (1), and the effective part of the control drum is the absorption surface.

7. The molten salt microreactor nuclear power source structure according to claim 1, characterized in that, The moderator (161) has a cylindrical structure.

8. The molten salt microreactor nuclear power source structure according to claim 1, characterized in that, The bottom collection area (17) of the core is equipped with a flow distributor.

9. The molten salt microreactor nuclear power source structure according to claim 1, characterized in that, The Stirling engine (15) is a plurality of such engines, which are arranged separately along the circumferential direction of the top reflector layer (12) of the reactor core.

10. The molten salt microreactor nuclear power source structure according to claim 1, characterized in that, The molten salt microreactor nuclear power structure also includes an outer shell (3) disposed outside the molten salt containment layer (2).

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