Space reactor neutron source assembly, control method and reactor system

Abstract

The invention belongs to the field of reactors, and particularly relates to a space reactor neutron source assembly, a control method and a reactor system. The space reactor neutron source assembly comprises a linear moving mechanism and a neutron source rod body arranged at the output end of the linear moving mechanism, and the neutron source rod body comprises a neutron source functional area, a gap and a cladding which are sequentially arranged from inside to outside; the neutron source functional area comprises a heat transfer area, a fuel area I, a separation area I, a neutron source, a separation area II and a shutdown area which are arranged in sequence. According to the space reactor neutron source assembly provided by the invention, the important position of the reactor core center can be better utilized. The reactor can move up and down in the center of a reactor core, is simple and compact in structure, and efficiently realizes the functions of fuel-assisted combustion, reactor starting and shutdown of a neutron source and reactivity adjustment.

Description

Technical Field

[0001] The present invention belongs to the field of reactors, and in particular relates to a space reactor neutron source component, a control method and a reactor system. Background Art

[0002] As space exploration continues to deepen, especially for deep space and distant solar missions, conventional energy sources like chemical and solar energy are increasingly unable to meet demand. Therefore, space power becomes the inevitable and only option. Currently, space reactors are the only option for high-power space power. As the demand for space power increases, so too are the requirements for space reactor core design. Currently and for the foreseeable future, space nuclear reactor power technology has and will continue to advance. Due to its superior performance, space nuclear reactor power technology is also being considered for use in other space missions.

[0003] Core design is a core area of ​​reactor design. Driven by the demands of deep space and distant solar exploration, and driven by the advantages of space reactors, the United States, Europe, and Russia are actively conducting research on space reactors. However, current core designs for space reactors designed by these major nuclear power countries only utilize the single-purpose neutron source for reactor startup, failing to fully utilize the crucial center of the reactor core. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a space reactor neutron source assembly, control method and reactor system that better utilizes the important position of the center of the reactor core, can move up and down in the center of the core, has a simple and compact structure, and efficiently realizes the functions of fuel auxiliary combustion, neutron source startup, shutdown, and reactivity adjustment.

[0005] The present invention provides a space reactor neutron source assembly, comprising a linear motion mechanism and a neutron source rod disposed at the output end of the linear motion mechanism, wherein the neutron source rod comprises a neutron source functional area, a gap, and a cladding arranged in sequence from the inside to the outside; The neutron source functional area includes a heat transfer area, a fuel area I, a separation area I, a neutron source, a separation area II and a shutdown area arranged in sequence; When the linear motion mechanism drives the neutron source in the neutron source rod to be located in the middle of the fuel zone II in the core assembly, the core assembly is ignited and started; when the linear motion mechanism drives the fuel zone I in the neutron source rod to correspond to the fuel zone II in the core assembly, the combustion of the core assembly is enhanced; when the linear motion mechanism drives the shutdown zone in the neutron source rod to correspond to the fuel zone II in the core assembly, the core assembly is shut down or the reactivity is adjusted.

[0006] Furthermore, the height of the fuel zone I is consistent with the height of the fuel zone II in the core assembly.

[0007] Furthermore, the height of the heat transfer zone is consistent with the height of the power generation hot end zone in the core assembly.

[0008] Furthermore, the sum of the heights of the compartment I, the neutron source, and the compartment II is equal to or higher than the height of the core assembly; When the neutron source in the neutron source rod is located in the middle of the fuel zone II in the core assembly, the upper end of the separation zone I is flush with the upper end of the core assembly or the upper end of the separation zone I protrudes from the upper end of the core assembly; the lower end of the separation zone II is flush with the lower end of the core assembly or the lower end of the separation zone II protrudes from the lower end of the core assembly.

[0009] Furthermore, the height of the shutdown zone is higher than or equal to the height of the core assembly; When the shutdown zone in the neutron source rod corresponds to the fuel zone II in the core assembly, two ends of the shutdown zone are flush with two ends of the core assembly or protrude from two ends of the core assembly.

[0010] Furthermore, the heat transfer zone is made of carbon nanotube material; and / or, The core material of the fuel pellets in the fuel zone I is UN, U 235 Enrichment 65%; and / or, The materials of the separation area I and the separation area II are Al2O3; and / or, The neutron source material is Am-Be; and / or, The material of the shutdown area is B4C.

[0011] Furthermore, the cladding material is SS316L steel.

[0012] Furthermore, the gap can accommodate fission-produced gas.

[0013] The present invention also provides a method for controlling a space reactor neutron source assembly, using the above-mentioned space reactor neutron source assembly, comprising the following steps: When the core assembly needs to be ignited and started, the neutron source in the neutron source rod is driven by the linear motion mechanism to be located in the middle of the fuel zone II in the core assembly; When the combustion of the core assembly needs to be enhanced, the linear motion mechanism drives the fuel zone I in the neutron source rod to move, adjusts the position of the fuel zone I and the fuel zone II in the core assembly, and adjusts at least one of the positions of the fuel zone II, the control drum, and the fuel zone I according to the burnup situation to ensure critical heat release of the reactor burnup; When it is necessary to shut down the core assembly or adjust the reactivity, the linear motion mechanism drives the shutdown area in the neutron source rod to move, adjusts the position of the shutdown area and the fuel area II in the core assembly, and adjusts the position of the fuel area II, the control drum and the shutdown area according to the burnup situation to ensure the reactor shielding shutdown or moderately adjust the reactivity.

[0014] The present invention also provides a reactor system, comprising a core assembly and the above-mentioned space reactor neutron source assembly.

[0015] The present invention provides a beneficial effect: the space reactor neutron source assembly provides better utilization of the crucial center of the reactor core. It can be moved up and down within the core center, boasting a simple and compact structure, efficiently performing fuel-assisted combustion, neutron source startup, shutdown, and reactivity adjustment. Compared to existing neutron source regions that only provide reactor ignition, this assembly can achieve fuel-assisted combustion, shutdown, and reactivity adjustment without increasing the circumferential dimensions. This significantly enhances the controllability of the reactor system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attachment Figure 1 is a schematic longitudinal cross-sectional view of the neutron source rod of the present invention; Attachment Figure 2 is a schematic cross-sectional view of the neutron source rod in the present invention; Attachment Figure 3 This is a schematic diagram of the reactor system structure when the neutron source assembly of the space reactor of the present invention is started; Attachment Figure 4 This is a schematic diagram of the reactor system structure when the neutron source assembly of the space reactor of the present invention performs auxiliary combustion; Attachment Figure 5 This is a schematic diagram of the reactor system structure when the neutron source assembly of the space reactor of the present invention is shut down; Attachment Figure 6 It is a top view of the neutron source assembly of the space reactor of the present invention.

[0017] In the figure, 1-space reactor neutron source assembly; 11-heat transfer zone; 12-fuel zone I; 13-separation zone I; 14-neutron source; 15-separation zone II; 16-shutdown zone; 17-gap; 18-cladding; 2-core assembly; 21-fuel zone II; 22-first reflection zone; 23-second reflection zone; 24-third reflection zone; 25-gas chamber; 26-control drum; 27-shielding zone; 28-power generation hot end zone. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0019] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0020] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0021] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection, electrical connection, physical connection, or wireless communication connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] As attached Figure 1 -Attached Figure 6As shown, the present invention provides a space reactor neutron source assembly 1 for starting up, shutting down, controlling combustion, and performing auxiliary combustion on a core assembly 2. The core assembly 2 includes a fuel area II 21, a first reflecting area 22 disposed outside the fuel area II 21, a second reflecting area 23 disposed above the fuel area II 21, a third reflecting area 24 disposed below the fuel area II 21, an air chamber 25 disposed between the fuel area II 21 and the third reflecting area 24, a plurality of control drums 26 disposed within the first reflecting area 22, a shielding area 27 disposed outside the first reflecting area 23, and a power generation hot end area 28 disposed above the second reflecting area 22 and the first reflecting area 23. The specific working principle of the core assembly 2 is based on the existing technology. The space reactor neutron source assembly 1 includes a linear motion mechanism and a neutron source rod disposed at the output end of the linear motion mechanism. The linear motion mechanism can be any drive mechanism capable of linear reciprocating motion, such as a cylinder, hydraulic cylinder, or electric cylinder. It can also be a combination of a motor and a linear reciprocating transmission mechanism. Any mechanism that meets the temperature requirements of the space reactor is acceptable. The neutron source rod can be cylindrical or rectangular, depending on actual needs. A cylindrical structure is preferably used. The neutron source rod includes a neutron source functional area, a gap 17, and a cladding 18, which are arranged in sequence from the inside to the outside. The neutron source functional area is used to control and assist combustion of the core assembly 2. The gap 17 facilitates the installation of the fuel area I 12 into the cladding 18 and can also accommodate fission gas to prevent radiation swelling. The cladding 18 is used to form the neutron source rod into a whole, enabling overall movement. The neutron source functional area includes a heat transfer area 11, a fuel area I 12, a separation area I 13, a neutron source 14, a separation area II 15 and a shutdown area 16 which are arranged in sequence; When core assembly 2 is in the ignition operating state, heat transfer zone 11 is used to complement the heat transfer entity of power generation hot end zone 28 when aligned with power generation hot end zone 28. On the one hand, it can conduct heat from power generation hot end zone 28, improving the heat uniformity of power generation hot end zone 28. On the other hand, it can also directly conduct heat to fuel zone I 12. The two work together to improve the heating temperature and heat uniformity, ultimately increasing power generation. In addition, heat transfer zone 11 is also used to conduct heat to block the heat of fuel zone I 12 when fuel zone I 12 and fuel zone II 21 are aligned, preventing the heat of fuel zone I 12 from overflowing through the through-holes in the second reflective zone 22, and preventing the heat of fuel zone I 12 from affecting the shielding zone 27 and burning the shielding zone 27.

[0024] After the core assembly 2 is in the ignition operating state, the fuel zone I 12 is used to correspond to the fuel zone II 21 in the core assembly 2 and can serve as a supplement to the fuel zone II 21, thereby increasing the total amount of fuel and thus improving the combustion effect, so that the space reactor has sufficient backup reactivity. In addition, other functional zones such as the fuel zone II 21 (fuel enrichment), the control drum 26 (the direction of the control drum 26), and the position of the fuel zone I 12 (the degree of intersection between the fuel zone I 12 and the fuel zone II 21) can be adjusted according to the burnup situation to ensure critical heat release of the space reactor. Separator I 13 physically separates neutron source 14 and fuel zone I 12. This serves to thermally insulate the two, preventing heat transfer from one operating section to the other, thereby maintaining the neutron source 14 at a relatively low operating temperature, ensuring its performance stability and lifespan. It also protects the fuel zone I 12 from unnecessary interference from additional heat sources or localized overheating. Furthermore, it prevents direct physical contact between the neutron source 14 and fuel zone I 12, which could result in accidental overheating and damage.

[0025] The neutron source 14 is used to ignite the core assembly 2. When the linear motion mechanism drives the neutron source 14 to be located in the middle of the fuel area II 21 in the core assembly 2, neutrons are continuously injected into the core, and the critical space reactor is ignited.

[0026] Separation zone II 15 is used to physically separate the neutron source 14 and the shutdown zone 16, which can prevent the shutdown zone 16 from being damaged, swollen or reducing the absorption efficiency due to overheating, ensuring its shutdown reliability under high burnup or emergency conditions. It can also prevent the shutdown zone 16 from interfering with the expected operating temperature of the neutron source 14 and maintain the stability of its neutron yield.

[0027] The shutdown zone 16 is used to shut down the reactor when it corresponds to the fuel zone II 21 in the core assembly 2. It can also be used to adjust the position of the shutdown zone 16 and the fuel zone II 21 to adjust reactivity. Specifically, during a shutdown, the shutdown zone 16 absorbs neutrons within the core assembly 2, rapidly reducing the reactor to a subcritical state and halting the chain reaction. To adjust reactivity, the fuel zone II 21 (fuel enrichment), the control drum 26 (control drum 26 orientation), and the position of the shutdown zone 16 (the degree of intersection between the shutdown zone 16 and the fuel zone II 21) can be adjusted based on burnup to achieve optimal reactivity control.

[0028] That is, when the linear motion mechanism drives the neutron source 14 in the neutron source rod to be located in the middle of the fuel zone II 21 in the core assembly 2, ignition and start-up of the core assembly 2 are achieved; when the linear motion mechanism drives the fuel zone I 12 in the neutron source rod to correspond to (including aligning or having an intersection with) the fuel zone II 21 in the core assembly 2, combustion of the core assembly 2 is enhanced; and when the linear motion mechanism drives the shutdown zone 16 in the neutron source rod to correspond to (including aligning or having an intersection with) the fuel zone II 21 in the core assembly 2, shutdown of the core assembly 2 or reactivity adjustment is achieved.

[0029] The space reactor neutron source assembly 1 provided by the present invention effectively utilizes the crucial center of the reactor core. It can be moved up and down within the core center, boasting a simple and compact structure. It efficiently performs fuel-assisted combustion, neutron source startup and shutdown, and reactivity adjustment. Compared to existing neutron source regions that only provide reactor ignition, this assembly can achieve fuel-assisted combustion, shutdown, and reactivity adjustment without increasing the circumferential dimensions. This significantly enhances the controllability of the reactor system.

[0030] In one embodiment, the height of the fuel zone I 12 is consistent with the height of the fuel zone II 21 in the core assembly 2. That is, when the positions of the fuel zone I 12 and the fuel zone II 21 correspond, the ends of the fuel zone I 12 can be aligned with the ends of the fuel zone II 21, thereby maximizing the supplementation of the fuel zone II 21 and maximizing the auxiliary combustion effect.

[0031] In one embodiment, the height of the heat transfer zone 11 coincides with the height of the hot power generation end zone 28 in the core assembly 2. Furthermore, since the height of the fuel zone I 12 coincides with the height of the fuel zone II 21 in the core assembly 2, when the fuel zones I 12 and II 21 align, the heat transfer zone 11 also aligns with the hot power generation end zone 28, maximizing heat transfer and increasing power generation. Preferably, the separator zone I 13 covers the through-holes of the gas chamber 25, the third reflective zone 24, and the shielding zone 27 in the core assembly 2 (the through-holes of the gas chamber 25 have inner walls, thereby ensuring a closed state at the through-holes of the gas chamber 25). This separator zone I 13 protects the third reflective zone 24 from thermal radiation, preventing degradation of the material in the third reflective zone 24 from long-term exposure to high temperatures. It also maintains the temperature at the through-holes of the gas chamber 25, the third reflective zone 24, and the shielding zone 27, eliminating thermal stress concentration points and improving the structural strength and integrity of the core assembly 2.

[0032] In one embodiment, the height of the partition I 13 , the neutron source 14 and the partition II 15 is greater than or equal to the height of the core assembly 2 ; When the neutron source 14 in the neutron source rod is located in the center of the fuel zone II 21 in the core assembly 2, the upper end of the separator I 13 is flush with the upper end of the core assembly 2 or protrudes from the upper end of the core assembly 2; the lower end of the separator II 15 is flush with the lower end of the core assembly 2 or protrudes from the lower end of the core assembly 2. In this embodiment, the neutron source 14 can be completely isolated. The separator I 13 and the separator II 15 completely isolate the leakage path of the neutron source 14, reducing the amount of neutrons escaping axially from the core and improving neutron utilization.

[0033] In one embodiment, the height of the shutdown area 16 is greater than or equal to the height of the core assembly 2; When the shutdown region 16 in the neutron source rod is aligned with the fuel region II 21 in the core assembly 2, the ends of the shutdown region 16 are flush with the ends of the core assembly 2 or protrude beyond the ends of the core assembly 2. This embodiment achieves complete axial absorption of neutrons, effectively preventing neutron leakage. When the strong absorber in the shutdown region 16 completely covers the core height, the axial leakage path of neutrons from the top or bottom of the core is completely blocked.

[0034] In one embodiment, the heat transfer zone 11 is made of carbon nanotube material, which has excellent thermal conductivity and lightweight requirements, and can meet the requirements of thermal conductivity efficiency and lightweight; and / or, The core material of the fuel pellets in the fuel zone Ⅰ 12 is UN, U 235 Enrichment 65%; and / or, The materials of the separation area I 13 and the separation area II 15 are Al 2 O 3 , which can achieve excellent heat insulation and ultra-high temperature heat resistance effects; and / or, The neutron source 14 is made of Ammonium-Be, which has a half-life of 458 years and is suitable for satellite operations, deep space or long-distance mission spacecraft; and / or, The material of the shutdown area 16 is B4C, which has excellent neutron absorption effect and provides efficient shutdown control.

[0035] In one embodiment, the cladding 18 is made of SS316L steel, which has good structural strength and corrosion resistance.

[0036] In one embodiment, the gap 17 can contain fission gas. In this embodiment, the gap 17 serves as a container for the fission gas and can resist radiation swelling.

[0037] The present invention also provides a space reactor neutron source assembly control method, using the above-mentioned space reactor neutron source assembly 1, comprising the following steps: When the core assembly 2 needs to be ignited and started, the neutron source 14 in the neutron source rod is driven by the linear motion mechanism to be located in the middle of the fuel zone II 21 in the core assembly 2; When it is necessary to enhance the combustion of the core assembly 2, the linear motion mechanism drives the fuel zone I 12 in the neutron source rod to move, adjusts the position of the fuel zone I 12 and the fuel zone II 21 in the core assembly 2, and adjusts at least one of the fuel zone II 21 (fuel enrichment), the control drum 26 (the orientation of the control drum 26), and the position of the fuel zone I 12 (the degree of intersection between the fuel zone I 12 and the fuel zone II 21) according to the burnup situation to ensure critical heat release of the reactor burnup; When it is necessary to shut down the core assembly 2 or adjust the reactivity, the linear motion mechanism drives the shutdown region 16 in the neutron source rod to move, thereby adjusting the position of the shutdown region 16 and the fuel region II 21 in the core assembly 2. Furthermore, the fuel region II 21 (fuel enrichment), the control drum 26 (the orientation of the control drum 26), and the position of the shutdown region 16 (the degree of intersection between the shutdown region 16 and the fuel region II 21) can be adjusted according to the burnup situation to ensure reactor shielding and shutdown or to appropriately adjust the reactivity.

[0038] The present invention also provides a reactor system comprising a core assembly 2 and the aforementioned space reactor neutron source assembly 1. The core assembly 2 comprises a fuel region II 21, a first reflecting region 22 disposed outside the fuel region II 21, a second reflecting region 23 disposed above the fuel region II 21, a third reflecting region 24 disposed below the fuel region II 21, an air chamber 25 disposed between the fuel region II 21 and the third reflecting region 24, a plurality of control drums 26 disposed within the first reflecting region 22, a shielding region 27 disposed outside the first reflecting region 23, and a power generation hot end region 28 disposed above the second reflecting region 22 and the first reflecting region 23. Coaxial through-holes are provided in the power generation hot end region 28, the second reflecting region 22, the fuel region II 21, the air chamber 25, the third reflecting region 24, and the shielding region 27 to allow the neutron source rod to move axially within the center of the core assembly 2.

[0039] The above description is merely an embodiment and does not limit the present invention in any way. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make many possible changes, modifications, or modifications to the technical solution of the present invention into equivalent embodiments with equivalent changes using the technical content disclosed above. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A space reactor neutron source assembly, characterized in that: It comprises a linear motion mechanism and a neutron source rod body arranged at the output end of the linear motion mechanism, wherein the neutron source rod body comprises a neutron source functional area, a gap (17) and a cladding (18) arranged in sequence from the inside to the outside; The neutron source functional area includes a heat transfer area (11), a fuel area I (12), a separation area I (13), a neutron source (14), a separation area II (15) and a shutdown area (16) which are arranged in sequence; When the linear motion mechanism drives the neutron source (14) in the neutron source rod to be located in the middle of the fuel zone II (21) in the core assembly (2), the ignition and start-up of the core assembly (2) are realized; when the linear motion mechanism drives the fuel zone I (12) in the neutron source rod to correspond to the fuel zone II (21) in the core assembly (2), the combustion of the core assembly (2) is enhanced; when the linear motion mechanism drives the stop zone (16) in the neutron source rod to correspond to the fuel zone II (21) in the core assembly (2), the shutdown of the core assembly (2) or the adjustment of the reactivity of the core assembly (2) is realized.

2. The space reactor neutron source assembly according to claim 1, wherein: The height of the fuel zone I (12) is consistent with the height of the fuel zone II (21) in the core assembly (2).

3. The space reactor neutron source assembly according to claim 2, wherein: The height of the heat transfer zone (11) is consistent with the height of the power generation hot end zone (28) in the core assembly (2).

4. The space reactor neutron source assembly according to claim 1, wherein: The height of the partition I (13), the neutron source (14) and the partition II (15) is equal to or higher than the height of the core assembly (2); When the neutron source (14) in the neutron source rod is located in the middle of the fuel zone II (21) in the core assembly (2), the upper end of the separation zone I (13) is flush with the upper end of the core assembly (2) or the upper end of the separation zone I (13) protrudes from the upper end of the core assembly (2); the lower end of the separation zone II (15) is flush with the lower end of the core assembly (2) or the lower end of the separation zone II (15) protrudes from the lower end of the core assembly (2).

5. The space reactor neutron source assembly according to claim 1, wherein: The height of the shutdown area (16) is higher than or equal to the height of the core assembly (2); When the stop zone (16) in the neutron source rod body corresponds to the fuel zone II (21) in the core assembly (2), the two ends of the stop zone (16) are flush with the two ends of the core assembly (2) or the two ends of the stop zone (16) protrude from the two ends of the core assembly (2).

6. The space reactor neutron source assembly according to any one of claims 1 to 5, characterized in that: The material of the heat transfer zone (11) is carbon nanotube material; and / or, The core material of the fuel pellets in the fuel zone Ⅰ (12) is UN, U 235 Enrichment 65%; and / or, The materials of the separation area I (13) and the separation area II (15) are Al2O3; and / or, The neutron source (14) is made of Am-Be; and / or, The material of the shutdown area (16) is B4C.

7. The space reactor neutron source assembly according to any one of claims 1 to 5, characterized in that: The cladding (18) is made of SS316L steel.

8. The space reactor neutron source assembly according to any one of claims 1 to 5, characterized in that: The gap (17) can accommodate fission-produced gas.

9. A method for controlling a neutron source assembly of a space reactor, characterized in that: Using the space reactor neutron source assembly according to any one of claims 1 to 8 comprises the following steps: When the core assembly (2) needs to be ignited and started, the neutron source (14) in the neutron source rod is driven by the linear motion mechanism to be located in the middle of the fuel zone II (21) in the core assembly (2); When the combustion of the core assembly (2) needs to be enhanced, the fuel zone I (12) in the neutron source rod is driven to move by the linear moving mechanism, and the positions of the fuel zone I (12) and the fuel zone II (21) in the core assembly (2) are adjusted. Furthermore, at least one of the positions of the fuel zone II (21), the control drum (26) and the fuel zone I (12) can be adjusted according to the burnup situation to ensure critical heat release of the reactor burnup; When it is necessary to shut down the core assembly (2) or adjust the reactivity, the shutdown area (16) in the neutron source rod body is driven to move by the linear moving mechanism, and the positions of the shutdown area (16) and the fuel area II (21) in the core assembly (2) are adjusted. In addition, the positions of the fuel area II (21), the control drum (26) and the shutdown area (16) can be adjusted according to the burnup situation to ensure that the reactor is shielded and shut down or the reactivity is appropriately adjusted.

10. A reactor system, characterized in that: It comprises a core assembly (2) and a space reactor neutron source assembly (1) as claimed in any one of claims 1 to 8.

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