A supercritical water-cooled reactor based on stacked fuel assemblies

Abstract

The invention discloses a supercritical water-cooled reactor based on a stacked fuel assembly, which includes a fuel assembly channel and a control rod assembly channel, both of which are in the shape of a regular hexagon or a square; the outer side of each control rod assembly channel Fuel assembly passages are arranged continuously along the circumference to form a unit assembly, and several unit assemblies are arranged in a staggered array to form a honeycomb core structure; fuel assemblies with different enrichment standards are arranged in the fuel assembly passages, and along the fuel assembly passages The enrichment of the fuel assembly gradually increases from bottom to top in the axial direction; the control rod assembly channel is used to install the control rod bundle. The present invention effectively solves the problems faced by supercritical water-cooled reactors, such as excessive changes in axial temperature and coolant density, and unbalanced distribution of neutron moderating capacity in the core, without introducing moderating water rods and multi-flow flow schemes. It significantly simplifies the fuel assembly and core layout scheme, and improves the engineering feasibility.

Description

technical field [0001] The invention relates to the technical field of nuclear reactors, in particular to a supercritical water-cooled reactor based on stacked fuel assemblies. 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 units have outstanding advantages such as high thermal efficiency and system simplification. Although SCWR has many advantages, there are still problems to be solved in terms of fuel assembly and core design: [0003] 1. In order to improve the thermal efficiency of the system, the pressure of the SCWR system reaches 25MPa, the reactor outlet temperature reaches 500°C, and some advanced design concepts even reach as high as 600°C, and the temperature difference between the inlet and outlet reaches 200°C to 300°C or more, so that the fuel assembly needs to bear the burden in the axial di...

AI Technical Summary

Problems solved by technology

[0008] In view of the above problems, the present invention provides a supercritical water-cooled reactor design based on superimposed fuel assemblies, which effectively solves the problems faced by supercritical water-cooled reactors without introducing moderating water rods and multi-flow flow schemes. The axial temperature and coolant density changes greatly, and the core neutron moderation capacity distribution is uneven, which simplifies the fuel assembly and core layout scheme, and improves the engineering feasibility

Images