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

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...

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

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