Plate fuel assembly and reactor core

Abstract

The application discloses a plate type fuel assembly and a reactor core, and belongs to the field of nuclear power engineering. The plate type fuel assembly comprises a metal cylinder, a plurality of groups of fuel structures arranged in the metal cylinder; the plurality of groups of fuel structures are sequentially stacked in the metal cylinder and respectively extend along the length direction of the metal cylinder; each group of fuel structures comprises a fuel layer and a cooling layer stacked on at least one side of the fuel layer; a plurality of coolant channels are arranged on the cooling layer in a spaced manner, the coolant channels penetrate through opposite end surfaces of the cooling layer and are respectively connected with two open ends of the metal cylinder. The plate type fuel assembly is used for composing a reactor core, is formed by stacking the fuel layer and the cooling layer in the metal cylinder, has high structural strength, the plurality of coolant channels arranged on the cooling layer increase the heat transfer area, improve the ratio of the heat transfer area to the volume, can improve the heat transfer coefficient and the heat transfer density of the core, and is suitable for constructing a small core and a high-temperature reactor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear fuel, in particular to a plate type fuel assembly and a reactor core. BACKGROUND

[0002] The conventional fuel assembly is basically assembled by fuel rods, guide tubes, positioning grids, upper tube seats and lower tube seats.

[0003] The prior art discloses two different core fuel assembly forms, which are different from the conventional fuel assembly. The first one uses 12% enriched UC embedded in bubble graphite, which is pressed into a long strip-shaped element with a hexagonal cross section, and uses SiC to seal all surfaces; the second one only uses 12% enriched UC, which is the same as the first one in shape, size and sealed surface. The core reflector material only contains natural uranium, and the surface of all fuel assemblies is attached with a 50 μm thick SiC layer for retaining radioactive products. The core formed by the above fuel assemblies has no metal material, and the heat conduction performance is limited.

[0004] Another prior art discloses a fuel assembly with a coated particle form fuel, the fuel assembly has a hexagonal cross section, and the fuel assembly substrate is SiC, in which the coated fuel particles are dispersed, and a plurality of cooling flow channels are arranged in the substrate. For the above fuel assembly, the heat transfer area of the coolant in unit volume is low, and the heat transfer capacity is weak. In order to enhance the heat transfer capacity, more cooling flow channels need to be arranged, however, too many cooling flow channels arranged on the substrate will make the substrate present a honeycomb coal shape, which will make the substrate easy to loosen, greatly reducing the structural strength of the fuel assembly. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a plate type fuel assembly with high structural strength and heat conduction performance and a reactor core with the plate type fuel assembly.

[0006] The technical scheme adopted by the present application to solve the technical problem is: providing a plate type fuel assembly, comprising a metal cylinder body with both ends open, and a plurality of fuel structures arranged in the metal cylinder body; the plurality of fuel structures are sequentially stacked in the metal cylinder body and respectively extend along the length direction of the metal cylinder body.

[0007] Each of the fuel structures comprises a fuel layer and a cooling layer stacked on at least one side of the fuel layer; the cooling layer is provided with a plurality of cooling agent channels arranged at intervals, the cooling agent channels penetrate through the opposite end faces of the cooling layer and are respectively connected with the two open ends of the metal cylinder body.

[0008] Preferably, the fuel layer comprises an alloy plate extending along the length direction of the metal cylinder body, and a plurality of fuel columns arranged at intervals in the alloy plate and extending along the length direction of the alloy plate.

[0009] Preferably, the fuel column comprises a graphite column, and coated fuel particles dispersed in the graphite column.

[0010] Preferably, the alloy plate is Alloy 800H, Alloy HX, Alloy 230 or Alloy 617.

[0011] Preferably, the fuel layer comprises an alloy plate extending along the length direction of the metal cylinder, and coated fuel particles dispersed in the alloy plate.

[0012] Preferably, the alloy plate is Alloy 800H, Alloy HX, Alloy 230 or Alloy 617.

[0013] Preferably, the coolant channel is formed by chemical etching.

[0014] Preferably, the diameter, width or depth of the coolant channel is 0.5mm-3mm.

[0015] Preferably, the cooling layer is made of a high-temperature-resistant alloy plate.

[0016] Preferably, the alloy plate is Alloy 800H, Alloy HX, Alloy 230 or Alloy 617.

[0017] Preferably, the cooling layer and the fuel layer are connected by vacuum diffusion welding.

[0018] Preferably, each group of the fuel structure comprises two cooling layers; the two cooling layers are respectively stacked on opposite sides of the fuel layer.

[0019] The present application provides another plate-type fuel assembly, comprising a metal cylinder with two open ends, and a plurality of groups of fuel structures arranged in the metal cylinder; the plurality of groups of fuel structures are sequentially stacked in the metal cylinder and respectively extend along the length direction of the metal cylinder.

[0020] Each group of the fuel structure comprises a fuel layer, and a cooling layer arranged on at least one side of the fuel layer; the cooling layer comprises a plurality of spaced coolant channels, which extend along the length direction of the metal cylinder and are connected to the two open ends of the metal cylinder.

[0021] Preferably, the fuel layer comprises a metal base plate extending along the length direction of the metal cylinder, and at least one heat-conductive alloy body embedded in the metal base plate.

[0022] Preferably, the heat-conductive alloy body comprises a uranium-molybdenum alloy.

[0023] Preferably, the coolant channel is formed by chemical etching.

[0024] Preferably, the diameter, width or depth of the coolant channel is 0.5mm-3mm.

[0025] Preferably, the cooling layer is arranged on at least one surface of the opposite two surfaces of the metal substrate.

[0026] Preferably, the cooling layer further comprises an alloy plate stacked on at least one side of the metal substrate; and the coolant channel is arranged on the alloy plate.

[0027] Preferably, the alloy plate is connected to the metal substrate by vacuum diffusion welding.

[0028] The present application also provides a reactor core comprising the plate-type fuel assembly of any one of the above.

[0029] The plate-type fuel assembly of the present application is used to form a reactor core, and is formed by stacking the fuel layer and the cooling layer in the metal cylinder, and has high structural strength; the plurality of coolant channels arranged in the cooling layer increase the heat transfer area, and further increase the ratio of the heat transfer area to the volume, so that the heat transfer coefficient and the heat transfer density of the core can be improved, which is beneficial to the miniaturization design of the core, and is suitable for constructing a small core, a high-temperature reactor and the like.

[0030] The plate-type fuel assembly of the present application has the characteristics of modular manufacturing, high integrated degree, large heat exchange area and high heat exchange efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0031] The present application will be further described below in conjunction with the drawings and embodiments, wherein:

[0032] Figure 1 is a schematic view of the cross-sectional structure of the plate-type fuel assembly of the first embodiment of the present application;

[0033] Figure 2 is a schematic view of the cross-sectional structure of the plate-type fuel assembly of the first embodiment of the present application in the length direction

[0034] Figure 3 is a schematic view of the cross-sectional structure of the plate-type fuel assembly of the second embodiment of the present application;

[0035] Figure 4 is a schematic view of the cross-sectional structure of the plate-type fuel assembly of the third embodiment of the present application. DETAILED DESCRIPTION

[0036] In order to have a clearer understanding of the technical features, objects and effects of the present application, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0037] As Figure 1 、 2 shown in the first embodiment of the present application, the plate type fuel assembly comprises a metal cylinder 10 and a plurality of fuel structures arranged in the metal cylinder 10.

[0038] The metal cylinder 10 is a cylinder structure with both ends open, and the open ends form open ends. The outer periphery of the metal cylinder 10 can be polygonal, circular or other shapes.

[0039] In the metal cylinder 10, the plurality of fuel structures are stacked in sequence along the width direction of the metal cylinder 10, so that the metal cylinder 10 is encapsulated in the outer periphery of the stacked plurality of fuel structures; the stacking between the plurality of fuel structures also makes them thermally connected. Each fuel structure extends along the length direction of the metal cylinder 10, so that the length of the fuel structure is comparable to the length of the metal cylinder 10. The length of the fuel structure can also be less than the length of the metal cylinder 10, so that the two ends of the fuel structure are located inside the two open ends of the metal cylinder 10, respectively.

[0040] Each fuel structure comprises a fuel layer 11 and a cooling layer 12 stacked on at least one side of the fuel layer 11. The cooling layer 12 and the fuel layer 11 are in thermal contact. The cooling layer 12 is provided with a plurality of coolant channels 121 arranged at intervals, which extend along the length direction of the metal cylinder 10, penetrate through the opposite end faces of the cooling layer 12 and are connected to the two open ends of the metal cylinder 10, respectively. The coolant enters the coolant channel 121 from one open end of the metal cylinder 10, flows along the coolant channel 121 and flows out from the other open end of the metal cylinder 10, as shown by the arrow in Figure 2 , so as to carry away the heat of the fuel layer 11.

[0041] The coolant is a medium with weak chemical effect, high heat transfer system and small flow resistance, such as supercritical CO2, helium and the like.

[0042] In this embodiment, the fuel layer 11 comprises an alloy plate 111 and a plurality of fuel columns 110 arranged at intervals and embedded in the alloy plate 111. The alloy plate 111 extends along the length direction of the metal cylinder 10, and the fuel column 110 extends along the length direction of the alloy plate 111 in the alloy plate 111.

[0043] The alloy plate 111 is made of high-temperature resistant alloy plate material, which can be Alloy 800H, Alloy HX, Alloy 230 or Alloy 617, etc.

[0044] Corresponding to the assembly of the fuel column 110, a channel is pre-set in the alloy plate 111, the fuel column 110 is placed in the channel, and the fuel column 110 fills and closes the channel, preferably without air gap between the fuel column 110 and the inner wall of the channel, reducing the thermal resistance caused by the air gap. In addition, after use and wear, the fuel column 110 in the fuel layer 11 can be removed and replaced with a new fuel column 110; the alloy plate 111 can be reused.

[0045] The fuel column 110 further comprises a graphite column 112 and a coated fuel particle 113 dispersed in the graphite column 112. Graphite has excellent neutron moderation characteristics and is an excellent material as a reactor core moderator. The cross-sectional diameter of the graphite column 112 can be set according to the requirements of neutron physics design; graphite also has a very high heat transfer coefficient, so as a substrate of the fuel column 110, it has good heat transfer performance and can transfer the heat of the coated fuel particle 113 out.

[0046] The coated fuel particle 113 has nuclear fuel (such as UO2, PuO2, ThO2, or mixed oxide fuel) as the core. The core is coated with a layer of low-density pyrolytic carbon and a layer of dense pyrolytic carbon; or, the core is coated with a layer of low-density pyrolytic carbon, two layers of high-density pyrolytic carbon, and a layer of silicon carbide (improved coated fuel particle, also TRISO coated fuel particle).

[0047] In this embodiment, the structure of the fuel layer 11 is set to form a three-layer airtight structure for nuclear fuel, the coated fuel particle 113, the graphite column 112, and the alloy plate 111, which has good radioactive containment.

[0048] In a preferred embodiment, the graphite column 112 is made into a cylinder.

[0049] The main body of the cooling layer 12 is made of high-temperature resistant alloy plate material, which is determined by considering the temperature and pressure of the reactor, the influence of the reactor on neutronics, and the corrosion effect of the coolant, and can be but not limited to Alloy 800H, Alloy HX, Alloy 230, or Alloy 617.

[0050] The cooling layer 12 is preferably made of the same material as the alloy plate 111 of the fuel layer 11, so that the cooling layer 12 and the fuel layer 11 can be connected by vacuum diffusion welding.

[0051] Combining the fuel structure formed by stacking the cooling layer 12 and the fuel layer 11, the overall structural strength is high, and the cooling layer 12 is provided with more coolant channels 121, which increases the heat transfer area of the fuel assembly, and further increases the ratio of heat transfer area to fuel assembly volume.

[0052] Further, by selecting the size of the coolant channel 121, such as a micro flow channel, the heat transfer area can be greatly increased, thereby further increasing the ratio of the heat transfer area to the volume, which is beneficial to improve the heat transfer coefficient. The cross section of the coolant channel 121 can be, but is not limited to, semicircular, circular, polygonal, etc. Moreover, on one cooling layer 12, the cross sections of the plurality of coolant channels 121 can be the same shape or different. For the semicircular or circular coolant channel 121, the cross section diameter is preferably 0.5mm-3mm; for the polygonal coolant channel 121, the width or depth is preferably 0.5mm-3mm.

[0053] In order to better obtain the micro flow channel, the coolant channel 121 on the cooling layer 12 can be formed by chemical etching.

[0054] Further, in the present embodiment, as shown in Figure 1 、 2 each group of fuel structures includes two cooling layers 12, and the two cooling layers 12 are respectively stacked on opposite sides of the fuel layer 11. The cooling layer 12 on one side of the fuel layer 11 has the coolant channel 121 arranged on the surface of the cooling layer 12 facing away from the fuel layer 11; the cooling layer 12 on the other side of the fuel layer 11 has the coolant channel 121 arranged on the surface of the cooling layer 12 facing toward the fuel layer 11.

[0055] In the two groups of fuel structures adjacent to each other, the two groups of fuel structures are respectively connected by the cooling layer 12 on one side.

[0056] As shown in Figure 2 , the plate-type fuel assembly of the second embodiment of the present application includes a metal cylinder 20 and a plurality of groups of fuel structures arranged in the metal cylinder 20.

[0057] The metal cylinder 20 is a cylinder structure with both ends open, and the two open ends form open ends. The outer periphery of the metal cylinder 20 can be polygonal, circular, etc.

[0058] In the metal cylinder 20, the plurality of groups of fuel structures are sequentially stacked along the width direction of the metal cylinder 20, so that the metal cylinder 20 is encapsulated by the outer periphery of the stacked plurality of groups of fuel structures. Each group of fuel structures extends along the length direction of the metal cylinder 20, so that the length of the fuel structure is comparable to the length of the metal cylinder 20. The length of the fuel structure can also be smaller than the length of the metal cylinder 20, so that the two ends of the fuel structure are respectively located inside the two open ends of the metal cylinder 20.

[0059] Each fuel structure comprises a fuel layer 21 and a cooling layer 22 stacked on at least one side of the fuel layer 21. The cooling layer 22 is provided with a plurality of coolant channels 221 arranged at intervals thereon, which extend along the length direction of the metal cylinder 20, and penetrate through opposite end faces of the cooling layer 22 and are respectively connected to the two open ends of the metal cylinder 20. Coolant enters the coolant channels 221 from one open end of the metal cylinder 20, flows along the coolant channels 221 and flows out from the other open end of the metal cylinder 20, thereby taking away the heat of the fuel layer 21.

[0060] In the embodiment, the fuel layer 21 comprises an alloy plate 211 and coated fuel particles 212 dispersed in the alloy plate 211. The alloy plate 211 extends along the length direction of the metal cylinder 20. The dispersion density of the coated fuel particles 212 in the alloy plate 211 can be flexibly set according to actual needs.

[0061] The alloy plate 211 is made of high-temperature-resistant alloy plate material, which can be selected from Alloy 800H, Alloy HX, Alloy 230 or Alloy 617, etc.

[0062] The coated fuel particles 212 take nuclear fuel (such as UO2, PuO2, ThO2 or mixed oxide fuel) as the core. The core is coated with a layer of low-density pyrolytic carbon and a layer of dense pyrolytic carbon; or the core is coated with a layer of low-density pyrolytic carbon, two layers of high-density pyrolytic carbon and a layer of silicon carbide (improved coated fuel particles, also TRISO coated fuel particles).

[0063] Compared with the first embodiment, in the embodiment, the coated fuel particles 212 are directly dispersed in the alloy plate 211, and the graphite column is not provided, so that the heat transfer resistance from the fuel to the coolant can be further reduced.

[0064] The main body of the cooling layer 22 is made of high-temperature-resistant alloy plate material, which can be selected from Alloy 800H, Alloy HX, Alloy 230 or Alloy 617, etc. in combination with the temperature and pressure of the reactor, the neutron physics effect of the reactor and the corrosion effect of the coolant.

[0065] The cooling layer 22 is preferably made of the same material as the alloy plate 211 of the fuel layer 21, so that the cooling layer 22 and the fuel layer 21 can be connected by vacuum diffusion welding.

[0066] In combination with the fuel structure formed by stacking the cooling layer 22 and the fuel layer 21, the overall structural strength is high, and the cooling layer 22 is provided with a plurality of coolant channels 221, which increases the heat transfer area of the fuel assembly, and further increases the ratio of the heat transfer area to the volume of the fuel assembly.

[0067] Further, by selecting the size of the coolant channel 221, such as a micro flow channel, the heat transfer area can be greatly increased, thereby further increasing the ratio of the heat transfer area to the volume, which is beneficial to improve the heat transfer coefficient. The cross section of the coolant channel 221 can be, but is not limited to, semicircular, circular, polygonal, etc. Moreover, on one cooling layer 22, the cross sections of the plurality of coolant channels 221 can be the same shape or different. For the semicircular or circular coolant channel 221, the cross section diameter is preferably 0.5mm-3mm; for the polygonal coolant channel 221, the width or depth is preferably 0.5mm-3mm.

[0068] In order to better obtain the micro flow channel, the coolant channel 221 on the cooling layer 22 can be formed by chemical etching.

[0069] Further, in the present embodiment, as shown in Figure 3 each group of fuel structures includes two cooling layers 22, which are respectively stacked on opposite sides of the fuel layer 21. The coolant channel 221 on the cooling layer 22 on one side of the fuel layer 21 is arranged on the surface of the cooling layer 22 facing away from the fuel layer 21; the coolant channel 221 on the cooling layer 22 on the other side of the fuel layer 21 is arranged on the surface of the cooling layer 22 facing toward the fuel layer 21.

[0070] In the two groups of fuel structures adjacent to each other, the two groups of fuel structures are connected by the cooling layer 22 on one side.

[0071] As shown in Figure 4 the third embodiment of the plate-type fuel assembly of the present application includes a metal cylinder 30 and a plurality of groups of fuel structures arranged in the metal cylinder 30.

[0072] The metal cylinder 30 is a cylinder structure with open ends, and the open ends form open ends. The outer periphery of the metal cylinder 30 can be polygonal, circular, etc.

[0073] In the metal cylinder 30, the plurality of groups of fuel structures are sequentially stacked along the width direction of the metal cylinder 30, so that the metal cylinder 30 is encapsulated by the outer periphery of the stacked plurality of groups of fuel structures. Each group of fuel structures extends along the length direction of the metal cylinder 30, so that the length of the fuel structure is comparable to the length of the metal cylinder 30. The length of the fuel structure can also be smaller than the length of the metal cylinder 30, so that the two ends of the fuel structure are respectively located inside the two open ends of the metal cylinder 30.

[0074] Each fuel structure includes a fuel layer 31 and a cooling layer 32 disposed on at least one side of the fuel layer 31. The cooling layer 32 has multiple spaced-apart coolant channels 321 extending along the length of the metal cylinder 30, penetrating opposite end faces of the cooling layer 32, and communicating with two open ends of the metal cylinder 30 respectively. Coolant enters the coolant channel 321 from one open end of the metal cylinder 30, flows along the coolant channel 321, and exits from the other open end of the metal cylinder 30, thereby carrying away heat from the fuel layer 31.

[0075] In this embodiment, the fuel layer 31 includes a metal substrate 311 and at least one thermally conductive alloy body 312 embedded in the metal substrate 311.

[0076] The metal substrate 311 extends along the length of the metal cylinder 30. The metal substrate 311 is made of a high-temperature resistant alloy sheet, such as Alloy 800H, Alloy HX, Alloy 230, or Alloy 617. The thermally conductive alloy body 312 extends within the metal substrate 311 along its length, and its overall length is preferably less than the length of the metal substrate 311, so that it does not protrude outside the metal substrate 311.

[0077] The main body of the thermally conductive alloy 312 is preferably made of an alloy material that is resistant to high temperatures and has good thermal conductivity, such as a uranium-molybdenum alloy. The uranium-molybdenum alloy is an alloy body made of uranium and molybdenum, which has good thermal conductivity; compared with coated fuel particles, it has the following advantages: 1) the uranium-molybdenum alloy has a higher fuel ratio; 2) the uranium-molybdenum alloy has high temperature resistance; 3) the uranium-molybdenum alloy has a containment effect on radioactive nuclides.

[0078] A uranium-molybdenum alloy is placed within a casing to form a monolithic thermally conductive alloy body 312. The thermally conductive alloy body 312 can be a rectangular plate structure or a rod shape. When multiple thermally conductive alloy bodies 312 are arranged in an array within a metal substrate 311, they are considered to be thermally conductive alloy bodies.

[0079] Furthermore, in this embodiment, as Figure 4 As shown, each fuel structure includes a fuel layer 31 and a cooling layer 32 disposed on one side of the fuel layer 31.

[0080] In two sets of fuel structures stacked adjacent to each other, the lower fuel structure is connected to the upper fuel structure on the side having the cooling layer 32.

[0081] In one embodiment, the cooling layer 32 can be integrally formed on the fuel layer 31, that is, a plurality of coolant channels 321 of the cooling layer 32 are disposed on at least one surface of two opposing surfaces of the metal substrate 311, such as... Figure 4The heat-conducting alloy body 312 is appropriately spaced from the coolant channel 321 in the metal substrate 311. The cross-sectional shape, size, and arrangement of the coolant channel 321 can refer to the first or second embodiment described above.

[0082] In another embodiment, the cooling layer 32 further comprises an alloy plate stacked on at least one side of the metal substrate 311; the alloy plate is connected to the metal substrate 311 by vacuum diffusion welding. The coolant channel 321 is arranged on the alloy plate. The cross-sectional shape, size, and arrangement of the coolant channel 321 can refer to the first or second embodiment described above.

[0083] Each fuel structure of the plate-type fuel assembly of the present application can be modularly manufactured, and each fuel layer and cooling layer in each fuel structure can also be modularly manufactured, which is beneficial for production.

[0084] The plate-type fuel assembly of the present application is used to form a reactor core. In the reactor core, the number of plate-type fuel assemblies can be set according to actual needs, and the plate-type fuel assemblies can be stacked in parallel. Each plate-type fuel assembly is an independent body and does not directly transfer mass to each other, but can transfer heat.

[0085] The above description is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is based on the content of the specification and drawings of the present application, is also included in the patent protection scope of the present application.

Claims

1. A plate-type fuel assembly, characterized in that, It includes a metal cylinder open at both ends and multiple sets of fuel structures disposed within the metal cylinder; the multiple sets of fuel structures are stacked sequentially within the metal cylinder and extend along the length direction of the metal cylinder respectively; Each set of the fuel structure includes a fuel layer and two cooling layers stacked on opposite sides of the fuel layer; the cooling layers are provided with a plurality of spaced coolant channels, which penetrate the opposite end faces of the cooling layers and are respectively connected to the two open ends of the metal cylinder; the cross-section of the coolant channels is semi-circular; Each set of the fuel structure can be manufactured modularly, and the fuel layer and the cooling layer can be manufactured modularly respectively; The fuel layer includes an alloy plate extending along the length of the metal cylinder and a plurality of fuel columns spaced apart and embedded within the alloy plate, extending along the length of the alloy plate; channels are pre-formed within the alloy plate, and the fuel columns fill and seal the channels, with no air gaps between the fuel columns and the inner walls of the channels, reducing thermal resistance caused by air gaps; the fuel columns include graphite columns and coated fuel particles dispersed within the graphite columns; or... The fuel layer includes an alloy plate extending along the length of the metal cylinder and coated fuel particles dispersed within the alloy plate. The coated fuel particles use nuclear fuel as the core, and the core is coated with a layer of low-density pyrolytic carbon and a layer of dense pyrolytic carbon; or, the core is coated with a layer of low-density pyrolytic carbon, two layers of high-density pyrolytic carbon and a layer of silicon carbide. The cooling layer is made of high-temperature resistant alloy plate, and the cooling layer and the fuel layer are connected by vacuum diffusion welding; the coolant channels on the cooling layer are formed by chemical etching.

2. The plate fuel assembly according to claim 1, characterized in that, The alloy plate is Alloy 800H, AlloyHX, Alloy 230 or Alloy 617.

3. The plate fuel assembly according to claim 1, characterized in that, The diameter, width, or depth of the coolant channel is 0.5 mm to 3 mm.

4. The plate fuel assembly according to claim 1, characterized in that, The alloy sheet is Alloy 800H, Alloy HX, Alloy 230 or Alloy 617.

5. A plate-type fuel assembly, characterized in that, It includes a metal cylinder open at both ends and multiple sets of fuel structures disposed within the metal cylinder; the multiple sets of fuel structures are stacked sequentially within the metal cylinder and extend along the length direction of the metal cylinder; each set of fuel structures can be manufactured modularly; Each set of the fuel structure includes a fuel layer and a cooling layer disposed on at least one side of the fuel layer; the cooling layer includes a plurality of spaced coolant channels, the coolant channels extending along the length of the metal cylinder and communicating with the two open ends of the metal cylinder; the coolant channels are formed by chemical etching; the cross-section of the coolant channels is semi-circular; the fuel layer and the cooling layer can be manufactured modularly. The fuel layer includes a metal substrate extending along the length of the metal cylinder, at least one thermally conductive alloy body embedded in the metal substrate, and a cooling layer disposed on at least one of two opposing surfaces of the metal substrate. The thermally conductive alloy body includes a uranium-molybdenum alloy.

6. The plate fuel assembly according to claim 5, characterized in that, The diameter, width, or depth of the coolant channel is 0.5 mm to 3 mm.

7. The plate fuel assembly according to any one of claims 5-6, characterized in that, The cooling layer further includes an alloy plate stacked on at least one side of the metal substrate; the coolant channel is disposed on the alloy plate.

8. The plate fuel assembly according to claim 7, characterized in that, The alloy plate is connected to the metal substrate by vacuum diffusion welding.

9. A reactor core, characterized in that, Includes the plate fuel assembly as described in any one of claims 1-4 or the plate fuel assembly as described in any one of claims 5-8.

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