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Dual-zone fuel coolant counterflow fuel assembly and supercritical water cooled reactor

A technology of fuel assembly and reverse flow, which is applied in the direction of reactor fuel elements, assembly of fuel elements, reactors, etc., can solve problems such as economical decline, reduce structural materials, improve neutron economics and engineering realizability, The effect of improving engineering realizability

Active Publication Date: 2017-02-22
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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  • Dual-zone fuel coolant counterflow fuel assembly and supercritical water cooled reactor
  • Dual-zone fuel coolant counterflow fuel assembly and supercritical water cooled reactor
  • Dual-zone fuel coolant counterflow fuel assembly and supercritical water cooled reactor

Examples

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Embodiment 1

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

[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 using a heat insulating shroud 5, and a guide tube 3 is provi...

Embodiment 2

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

[0036] The inner fuel rod 2 is a low enrichment UO 2 Fuel, the outer fuel rod 1 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 rod diameter of the fuel rods 2 in the inner region is smaller than or equal to the rod diameter of the fuel rods 1 in the outer region, and the distance between the fue...

Embodiment 3

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

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Abstract

The invention discloses a dual-zone fuel coolant counterflow fuel assembly and a supercritical water cooled reactor. The fuel assembly comprises a fuel assembly body. The fuel assembly body comprises a heat insulating shroud and an assembly box which are both in a barrel shape. The heat insulating shroud is sleeved with the assembly box, inner zone fuel rods and guide pipes are arranged in the heat insulating shroud, and outer zone fuel rods are arranged between the outer wall of the heat insulating shroud and the inner wall of the assembly box. The supercritical water cooled reactor comprises the fuel assembly. Compared with the prior art, according to the structure of the fuel assembly and the supercritical water cooled reactor, water rods occupying multiple lattice cells or a solid moderator is omitted, no guide pipe is arranged in an outer zone, the technical difficulty of the structural design of the assembly, components in the reactor and the like and the physical design of a reactor core is greatly lowered, structural materials are reduced, and neutron economical efficiency and engineering realizability are remarkably improved. The structural design of a pressure container, especially an upper steam chamber structure can be greatly simplified, and engineering realizability is remarkably improved.

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] The 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). The SCWR nuclear power unit has outstanding advantages such as high thermal efficiency and simplified system. However, in order to solve the problems of insufficient neutron moderation and flow instability in SCWR, a "water rod" design was introduced in the component design, and a "multi-flow" flow scheme was adopted in the core design, which made the component and core structure design very It is complicated, and the engineering achievability is greatly reduced. [0003] Existing supercritical water-cooled reactor components and core design schemes all have "water rods" or so...

Claims

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Application Information

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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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