Reactor core structure and liquid metal cooling fast reactor

Abstract

The embodiment of the invention relates to the technical field of nuclear reactors, in particular to a reactor core structure and a liquid metal cooling fast reactor. The reactor core structure comprises a grid assembly, a fuel assembly, a functional assembly, a stainless steel assembly and a production assembly, wherein a plurality of pore passages adjacent to each other are formed in the grid assembly; the fuel assembly is arranged in the hole channel near the middle of the multiple hole channels; the functional assembly is used for adjusting the performance of the reactor and is arranged on the outer side of the pore channel of the fuel assembly; the stainless steel assembly is arranged in the outermost pore channel of the plurality of pore channels, and the remaining pore channels of the plurality of pore channels are used for arranging the production assembly to be irradiated in the reactor core structure, so that the required substance is produced, and fuel in the fuel assembly comprises nitride fuel; and the total neutron fluence rate of the fuel assembly in the reactor core structure is not lower than a preset value. According to the reactor core structure and the liquid metal cooling fast reactor provided by the embodiment of the invention, a relatively high neutron fluence rate can be provided, and the reactor belongs to a high-flux reactor.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of nuclear reactors, and in particular to a core structure and a liquid metal cooled fast reactor. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] For neutron injection rates close to or greater than 5×10 15 n / (cm 2 ·s) can be called a high-flux reactor. High-flux reactors play an important role in advanced fuel research, production of special isotopes, and exploration of basic nuclear technologies. However, my country currently lacks service application performance data of high-flux reactors, which has led to slow research progress in related areas. Summary of the invention

[0004] A brief overview of the present application is provided below in order to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify the key or important parts of the present application, nor is it intended to limit the scope of the present application. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0005] A first aspect of an embodiment of the present application provides a core structure of a reactor, which includes a grid assembly, a fuel assembly, a functional assembly, a stainless steel assembly and a production assembly, wherein a plurality of channels adjacent to each other are formed in the grid assembly; the fuel assembly is arranged in a channel located near the middle of the plurality of channels; the functional assembly is used to adjust the performance of the reactor, and is arranged on the outside of the channel where the fuel assembly is arranged; the stainless steel assembly is arranged in the outermost channel of the plurality of channels, and the remaining channels of the plurality of channels are used to set the production assembly to be irradiated in the core structure, thereby producing the desired substance, wherein the fuel in the fuel assembly includes nitride fuel, and the fuel assembly is arranged so that the total neutron injection rate of the core structure is not less than a predetermined value.

[0006] A second aspect of an embodiment of the present application provides a liquid metal cooled fast reactor, which includes the core structure provided by the first aspect of an embodiment of the present application.

[0007] The core structure and liquid metal-cooled fast reactor provided in the embodiments of the present application can provide a higher neutron injection rate and belong to a high-flux reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to further illustrate the above and other advantages and features of the present application, the specific embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. The accompanying drawings together with the following detailed description are included in this specification and form a part of this specification. Elements with the same function and structure are represented by the same reference numerals. It should be understood that these drawings only describe typical examples of the present application and should not be regarded as limiting the scope of the present application.

[0009] Figure 1 is a structural schematic diagram of a core structure according to an embodiment of the present application;

[0010] Figure 2 It is a BOC maximum neutron fluence rate distribution diagram of a reactor provided according to an embodiment of the present application.

[0011] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding.

[0012] Explanation of the reference numerals: 1, first fuel assembly; 2, second fuel assembly; 3, third fuel assembly; 4, stainless steel assembly; SH, supplementary rod assembly; RE, regulating assembly; PEP, absorber rod assembly; SA, safety rod assembly. DETAILED DESCRIPTION

[0013] Exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary from implementation to implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the content of this application.

[0014] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure and / or processing steps closely related to the scheme according to the present application are shown in the accompanying drawings, while other details that are not very relevant to the present application are omitted.

[0015] The disclosure below provides a plurality of different embodiments or examples to implement the present application. In order to simplify the disclosure of the present application, the parts and methods of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the present application. In the description of the embodiments of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

[0016] See also Figure 1 According to a first aspect of an embodiment of the present application, there is provided a core structure of a reactor, which includes a grid assembly, a fuel assembly, a functional assembly, a stainless steel assembly 4 and a production assembly, wherein a plurality of channels adjacent to each other are formed in the grid assembly; the fuel assembly is arranged in a channel located near the middle of the plurality of channels; the functional assembly is used to adjust the performance of the reactor, and is arranged on the outside of the channel where the fuel assembly is arranged; the stainless steel assembly is arranged in a channel located at the outermost portion of the plurality of channels, and the remaining channels of the plurality of channels are used to arrange the production assembly to be irradiated in the core structure, thereby producing the desired substance, wherein the fuel in the fuel assembly includes nitride fuel, and the fuel assembly is arranged so that the total neutron injection rate of the core structure is not less than a predetermined value.

[0017] The predetermined value here can be, for example, 5×10 15 n / (cm 2 ·s), the core structure provided by the embodiment of the present application can provide more than 1.5×10 16 n / (cm 2 ·s) neutron injection rate, which belongs to the high flux reactor.

[0018] See also Figure 1 In an embodiment of the present application, the production component is arranged at Figure 1 The yellow hole in the middle. The fuel assembly can use nitride (UN-PuN) as the fuel pellet. The outer diameter of the cladding of the fuel assembly can be 4.0 mm, and the length of the active area can be 60 cm. The spacing between adjacent grids of the grid assembly can be 7.32 mm.

[0019] In some embodiments, the fuel assembly may include a first fuel assembly 1, a second fuel assembly 2 and a third fuel assembly 3, the enrichment of the second fuel assembly 2 is greater than the enrichment of the first fuel assembly 1, and the enrichment of the second fuel assembly 2 is equal to the enrichment of the third fuel assembly 3; the first fuel assembly 1 is arranged in the centermost channel of multiple channels, and the second fuel assembly 2 and the third fuel assembly 3 are arranged in the channels outside the channel of the first fuel assembly 1.

[0020] The local power peak of the reactor will limit the total power output of the entire reactor, so it is necessary to flatten the power of the reactor to increase the total output power of the reactor. Therefore, the fuel assembly can be divided into a first fuel assembly 1, a second fuel assembly 2 and a third fuel assembly 3, and the first fuel assembly 1 arranged in the most central channel of the multiple channels has a relatively lower enrichment, which can play a role in power flattening. In an embodiment of the present application, the U-235 enrichment of the first fuel assembly is 18.6%, and the U-235 enrichment of the second fuel assembly 2 and the third fuel assembly 3 is 30.1%. In addition, the PuN enrichment of the first fuel assembly 1, the second fuel assembly 2 and the third fuel assembly 3 is 30%.

[0021] In some embodiments, the first fuel assembly has multiple holes, in which the holes are arranged in sequence from the center to the outside, and the holes in which the second fuel assembly 2 and the third fuel assembly 3 are arranged are outside the outermost holes of the first fuel assembly 1.

[0022] In some embodiments, the channels of the second fuel assembly 2 and the third fuel assembly 3 are arranged adjacent to each other, and the channels arranged between each second fuel assembly 2 and one third fuel assembly 3 and the next second fuel assembly 2 and the next third fuel assembly 3 are used to set up the production assembly.

[0023] A production assembly is arranged in the channel between the second fuel assembly 2 and the third fuel assembly 3, wherein the sub-injection is relatively high.

[0024] In some embodiments, the functional assembly includes a supplementary rod assembly SH (including Figure 1 SH and SH2), safety rod assembly SA (including Figure 1 The SA and SA2) and the absorber rod assembly PEP, the holes for setting the supplementary rod assembly SH, the safety rod assembly SA and the absorber rod assembly PEP are set on the outside of the second fuel assembly 2 and the third fuel assembly 3.

[0025] In some embodiments, the channels in which the supplementary rod assembly SH, the safety rod assembly SA and the absorption rod assembly PEP are arranged spaced apart from each other in the circumferential direction, and channels for arranging the production assembly are arranged therebetween.

[0026] In some embodiments, the functional component further includes a regulation component RE (including Figure 1 RE and RE2), the outside of the channel for the supplementary rod assembly SH, the safety rod assembly SA and the absorption rod assembly PEP is provided with multiple circles of channels in which the production components are arranged and the channels in which the adjustment components RE are arranged.

[0027] In some embodiments, the outermost channels are also provided with channels for setting production components, and the channels and the channels for setting stainless steel components 4 constitute the outermost channels of the core structure.

[0028] Still see Figure 1 , Figure 1 The yellow channel in the upper right corner can also be used to set up production components. Multiple production components set up in this part of the channel can form an irradiation loop. The irradiation loop can choose a suitable cooling method as needed, such as lead-bismuth cooling, sodium cooling, air cooling, etc.

[0029] In some embodiments, different production assemblies are provided with holes at locations where maximum neutron fluences are obtained are different.

[0030] See also Figure 2 , Figure 2 is a BOC maximum neutron fluence rate distribution diagram of a reactor provided according to an embodiment of the present application, Figure 2 The unit of the numbers is 1E15cm -2 s -1 It can be seen that in the core components provided by the embodiments of the present application, the maximum neutron flux rate of the whole reactor appears at the center of the core. The farther the component is from the center of the core, the lower the neutron flux rate. Therefore, the appropriate setting position can be selected according to the irradiation dose that the irradiated component needs to receive. For example, Figure 1 The blue part in the figure is an empty channel, and the production assembly can also be placed in the empty channel for irradiation. In the embodiment of the present application, the maximum linear power of the fuel rod is 95.2kW / m, and the flux outside the core is very high, which can provide an irradiation capacity of more than 2000DPA / L per year.

[0031] An embodiment of the present application also provides a liquid metal cooled fast reactor, which includes the core structure provided by any embodiment of the present application.

[0032] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.

[0033] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A core structure of a reactor, characterized in that: It includes: a grid assembly, wherein a plurality of channels adjacent to each other are formed in the grid assembly; A fuel assembly, wherein the fuel assembly is disposed in a hole located near the middle of the plurality of holes; A functional component, the functional component is used to adjust the performance of the reactor, and is arranged outside the hole where the fuel assembly is arranged; A stainless steel component, wherein the stainless steel component is disposed in the outermost channel of the plurality of channels, The remaining channels of the plurality of channels are used to arrange production components to be irradiated within the core structure, thereby producing the desired substance, The fuel in the fuel assembly includes nitride fuel, and the fuel assembly is configured so that the total neutron injection rate of the core structure is not less than a predetermined value.

2. The core structure according to claim 1, characterized in that: The fuel assembly includes a first fuel assembly, a second fuel assembly and a third fuel assembly, The enrichment of the second fuel assembly is greater than the enrichment of the first fuel assembly, and the enrichment of the second fuel assembly is equal to the enrichment of the third fuel assembly; The first fuel assembly is arranged in the most central hole of the plurality of holes, and the second fuel assembly and the third fuel assembly are arranged in holes outside the hole of the first fuel assembly.

3. The core structure according to claim 2, characterized in that: The first fuel assembly has a plurality of holes, and the holes are arranged in the holes in a circle from the center to the outside. The position of the hole in which the second fuel assembly and the third fuel assembly are arranged is outside the outermost hole of the first fuel assembly.

4. The core structure according to claim 3, characterized in that: The holes for setting the second fuel assembly and the third fuel assembly are arranged adjacent to each other, and the holes between each second fuel assembly and a third fuel assembly and the next second fuel assembly and the next third fuel assembly are used to set the production assembly.

5. The core structure according to claim 4, characterized in that: The functional assembly includes a supplementary rod assembly, a safety rod assembly and an absorption rod assembly. The holes for setting the supplementary rod assembly, the safety rod assembly and the absorption rod assembly are arranged on the outside of the second fuel assembly and the third fuel assembly.

6. The core structure according to claim 5, characterized in that: The channels for arranging the supplementary rod assembly, the safety rod assembly and the absorption rod assembly are arranged at intervals from each other along the circumferential direction, and channels for arranging production assemblies are arranged between them.

7. The core structure according to claim 6, characterized in that: The functional components also include a regulating component, The outer sides of the channels in which the supplementary rod assembly, the safety rod assembly and the absorption rod assembly are provided with multiple circles of channels in which production components are arranged and channels in which adjustment components are arranged.

8. The core structure according to claim 1, characterized in that: The outermost channels are also provided with channels for arranging production components, and the channels and the channels for arranging stainless steel components constitute the outermost channels of the core structure.

9. The core structure according to any one of claims 1 to 8, characterized in that: The maximum neutron flux obtained by setting different positions of the holes of the production components is different.

10. A liquid metal cooled fast reactor, characterized in that ， It comprises the core structure according to any one of claims 1 to 9.

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