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A thermal neutron spectrum mixed positioning multi-flow zone fuel assembly and supercritical water-cooled reactor

A hybrid positioning and fuel assembly technology, which is applied in the field of nuclear reactors, can solve the problems of complex structural design and manufacturing difficulties of assemblies and cores, and achieve the effects of enhancing the axial structural design strength of assemblies, reducing structural design, and enhancing heat transfer.

Active Publication Date: 2017-10-13
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a thermal neutron spectrum mixed positioning multi-flow zone fuel assembly and a supercritical water-cooled reactor, which solves the problems of extremely complex design and difficult manufacture of components and core structures

Method used

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  • A thermal neutron spectrum mixed positioning multi-flow zone fuel assembly and supercritical water-cooled reactor
  • A thermal neutron spectrum mixed positioning multi-flow zone fuel assembly and supercritical water-cooled reactor
  • A thermal neutron spectrum mixed positioning multi-flow zone fuel assembly and supercritical water-cooled reactor

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Embodiment 1

[0028] Such as figure 1 , figure 2 As shown, a thermal neutron spectrum mixed positioning multi-flow zone fuel assembly includes a heat insulation shroud 7 and a strong heat insulation assembly box 8 and an assembly grid 9 that are sequentially set outside the heat insulation shroud 7 in the radial direction. The inside of the heat enclosure 7 is the inflow zone 1, the middle flow zone 2 is between the heat insulation enclosure 7 and the strong heat insulation component box 8, and the outflow zone 3 is between the strong heat insulation component box 8 and the component grid 9, namely The interior of the fuel assembly radially includes an inner flow area 1, an intermediate flow area 2, and an outer flow area 3. The coolant inlet of the inner flow area 1 is located at the upper part of the inner flow area 1, and the cooling of the inner flow area 1 The agent outlet is located at the lower part of the inner flow area 1, the coolant inlet of the middle flow area 2 is located at...

Embodiment 2

[0036] Such as figure 1 As shown, the structure of the thermal neutron spectrum mixing and positioning multi-flow area fuel assembly is the same as that of Embodiment 1, and further, the thermal neutron spectrum mixing positioning multi-flow area fuel assembly is a square fuel assembly 23, and the fuel assembly adopts a fuel rod outside The diameter is 9.5 mm, and the fuel rods 4 in the internal flow area are arranged in a 12×12 square grid with a grid pitch of 12.2 mm. A total of 9 guide tubes 6 and 108 fuel rods are arranged in the internal flow area 1, and the grid frame 5 is used for positioning. Each guide tube 6 occupies 4 grid positions, the outer diameter of the guide tube 6 is 24.0 mm, and the wall thickness is 1.0 mm. The heat insulation shroud 7 between the inner flow area 1 and the middle flow area 2 has a thickness of 1.0mm. The fuel rods 22 in the middle flow area are arranged in a dense grid of 18×18 squares with a grid pitch of 10.6 mm. A total of 128 fuel rod...

Embodiment 3

[0040] The structure of the thermal neutron spectrum mixed positioning multi-flow zone fuel assembly is the same as that of embodiment 1, and further, such as figure 2 As shown, the fuel assembly in the thermal neutron spectrum mixing and positioning multi-flow area is a hexagonal fuel assembly 24, the outer diameter of the fuel rods is 9.5 mm, and the fuel rods 4 in the inner flow area are arranged in a triangular grid with a grid pitch of 12.6 mm. A total of 7 guide pipes 6 and 168 fuel rods are arranged in zone 1, and the grids 5 are used for positioning. Each guide tube 6 occupies 7 grid positions, the outer diameter of the guide tube 6 is 29.0 mm, and the wall thickness is 1.0 mm. The heat insulation shroud 7 between the inner flow area 1 and the middle flow area 2 has a thickness of 2.0 mm and a distance across sides of 191.4 mm. The fuel rods 22 in the intermediate flow area have a grid pitch of 10.6 mm, and a total of 216 fuel rods are arranged. The wires are used fo...

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Abstract

The invention discloses a thermal neutron spectrum mixed positioning multi-flow area fuel assembly, which comprises a heat insulation shroud, a strong heat insulation component box and a component grid sequentially set outside the heat insulation shroud along the radial direction, and the heat insulation shroud The interior is an inflow area, the middle flow area is between the heat insulation shroud and the strong heat insulation component box, the outflow area is between the strong heat insulation component box and the component grid, and the coolant flows from top to bottom in the internal flow area , the coolant flows from bottom to top in the middle flow area, and the coolant flows from top to bottom in the outer flow area. Also disclosed is a supercritical water-cooled reactor that uses the thermal neutron spectrum mixing to locate fuel assemblies in multiple flow zones. The invention has the beneficial effects of simple structural design, less difficulty in physical design, reduced introduction of structural materials, and significantly improved fuel economy, safety and engineering feasibility.

Description

technical field [0001] The invention relates to the technical field of nuclear reactors, in particular to a thermal neutron spectrum mixed positioning multi-flow region fuel assembly and a supercritical water-cooled reactor. Background technique [0002] Supercritical water-cooled reactor (SCWR) is one of the six most promising nuclear energy systems selected by the Generation IV Nuclear Energy International Forum. SCWR nuclear power unit has outstanding advantages such as high thermal efficiency and simplified system. In order to solve the problems of insufficient neutron moderation in SCWR, large temperature difference between the core inlet and outlet, and flow instability, the "water rod" design was introduced in the component design, and the multi-flow flow scheme was adopted for the coolant in the core design. Especially for thermal neutron spectrum supercritical water-cooled reactors, in order to achieve sufficient and uniform moderation of fuel elements, the "water ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/322G21C5/16G21C15/00
CPCG21C3/322G21C5/16G21C15/00Y02E30/30
Inventor 夏榜样卢迪王连杰李庆李翔
Owner NUCLEAR POWER INSTITUTE OF CHINA
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