A Dual Zone Fuel Coolant Reverse Flow Fuel Assembly and Supercritical Water Cooled Reactor

A technology of fuel assembly and reverse flow, applied in the direction of reactor fuel elements, assembly of fuel elements, reactors, etc., can solve problems such as economical decline, achieve the effects of reducing structural materials, simplifying structural design, and improving engineering realizability

Active Publication Date: 2018-04-24
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under ideal conditions, the design requirements are basically met. If manufacturing deviations and complex operating conditions are considered, the feasibility of components and core design solutions will face huge challenges
In addition, in order to ensure the diversion and heat insulation between the low-temperature coolant and the high-temperature coolant, a large amount of structural materials with strong neutron absorption capacity will be introduced into the core, resulting in a significant drop in economic efficiency

Method used

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  • A Dual Zone Fuel Coolant Reverse Flow Fuel Assembly and Supercritical Water Cooled Reactor
  • A Dual Zone Fuel Coolant Reverse Flow Fuel Assembly and Supercritical Water Cooled Reactor
  • A Dual Zone Fuel Coolant Reverse Flow Fuel Assembly and Supercritical Water Cooled Reactor

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Effect test

Embodiment 1

[0029] Such as Figure 1 to Figure 3 As shown, a dual-zone fuel coolant reverse flow fuel assembly includes a fuel assembly body, the fuel assembly body includes a cylindrical heat-insulating shroud 5 and an assembly box 4, and the assembly box 4 is sleeved on Outside the heat insulation shroud 5, the inner fuel rod 2 and the guide pipe 3 are arranged inside the heat insulation shroud 5, and the outer fuel rod is arranged between the outer wall of the heat insulation shroud 5 and the inner wall of the component box 4 1, and there are more than one fuel rod 2 in the inner zone, guide pipe 3, and fuel rod 1 in the outer zone, and the fuel rod 2 in the inner zone and the adjacent guide tube 3 or the fuel rod 2 in the inner zone, the fuel rod 1 in the outer zone and the The adjacent fuel rods 1 in the outer zone are evenly spaced.

[0030] In this embodiment, in the above fuel rod body structure, a plurality of fuel assemblies are divided into an inner area and an outer area by u...

Embodiment 2

[0035] This embodiment further defines or provides a specific implementation on the basis of the fuel assembly provided in Embodiment 1, such as Figure 1 to Figure 3 As described above, the fuel rods 2 in the inner area and the guide pipes 3 in the heat-insulating shroud 5 are arranged in a square or hexagonal grid, and the fuel rods 1 in the outer area between the outer wall of the heat-insulating shroud 5 and the inner wall of the assembly box 4 Arranged in a square or hexagonal grid with respect to each other.

[0036] The fuel rods 2 in the inner zone are low-enrichment UO 2 Fuel, the fuel rod 1 in the outer zone is high-enrichment UO 2 fuel or MOX fuel, the low-enrichment UO 2 fuel for 235 UO with U enrichment less than 5% 2 fuel, the high-enrichment UO 2 fuel for 235 UO with U enrichment greater than or equal to 5% 2 fuel.

[0037] The diameter of the fuel rods 2 in the inner zone is smaller than or equal to the diameter of the fuel rods 1 in the outer zone, and...

Embodiment 3

[0042] The embodiment further defines or provides a specific implementation on the basis of the supercritical water-cooled reactor provided in Example 1, as a technical solution that can adjust the local coolant flow in the inner and outer regions of the core assembly, so as to obtain The inner zone fuel rods 2 or the outer zone fuel rods 1 in different regions have different cooling capacities, and the upper chamber 7 and the lower chamber 9 are provided with throttling pieces for guiding or restricting the coolant flow.

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PUM

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Abstract

The invention discloses a double-zone fuel coolant reverse flow fuel assembly and a supercritical water-cooled reactor. The fuel assembly includes a fuel assembly body, and the fuel assembly body includes a cylindrical heat-insulating shroud and an assembly box. The component box is sleeved on the outside of the heat insulation shroud, and the fuel rods in the inner area and the guide pipe are arranged in the heat insulation shroud, and the fuel rods in the outer area are arranged between the outer wall of the heat insulation shroud and the inner wall of the assembly box. The illustrated supercritical water-cooled reactor includes the fuel assembly. Compared with the existing technology, the structure of the above fuel assembly and the supercritical water-cooled reactor cancel the "water rod" or "solid moderator" occupying multiple cells, and there is no guide pipe in the outer area, which can greatly reduce the cost of components and reactors. The structural design of internal components and the technical difficulty of core physical design reduce structural materials and significantly improve neutron economy and engineering feasibility. It can also greatly simplify the structural design of the pressure vessel, especially the structure of the upper steam chamber, and significantly improve the engineering feasibility.

Description

technical field [0001] The invention belongs to the technical field of nuclear reactors, in particular to a dual-zone fuel coolant reverse flow 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 (GIF). SCWR nuclear power unit has outstanding advantages such as high thermal efficiency and simplified system. However, in order to solve the problem of insufficient neutron moderation and flow instability in SCWR, the "water rod" design was introduced in the component design, and the "multi-flow" flow scheme was adopted in the core design, which made the component and core structure design very Complicated, the engineering realizability is greatly reduced. [0003] The existing supercritical water-cooled reactor components and core design schemes all have "water rods" or solid moderat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C15/02G21C15/12G21C3/32G21C3/322
CPCG21C3/32G21C3/322G21C15/02G21C15/12Y02E30/30
Inventor 夏榜样卢迪王连杰李庆李翔
Owner NUCLEAR POWER INSTITUTE OF CHINA
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