Sleeve type rod-shaped fuel assembly and supercritical water-cooling nuclear reactor utilizing same

Abstract

The invention relates to a sleeve type rod-shaped fuel assembly and a supercritical water-cooling nuclear reactor utilizing the same. The fuel assembly is of an annular sleeve type and comprises a water hole wall, an inner thermal insulation layer, an inner ring liner tube, an outer ring liner tube, an outer thermal insulation layer and an assembly wall from inside to outside, wherein fuels are filled between the inner ring liner tube and the outer ring liner tube. The supercritical water-cooling nuclear reactor utilizing the assembly comprises a pressure container, wherein the pressure container comprises a pressure shell, a reactor core and a control rod drive mechanism; the reactor core and the control rod drive mechanism are arranged in the pressure shell, the upper part and the lower part of the pressure shell are respectively divided into an upper cavity and a lower cavity by an upper partition board and a lower partition board, a plurality of the sleeve type rod-shaped fuel assemblies are vertically placed into the reactor core, the water hole walls and the assembly walls of the sleeve type rod-shaped fuel assemblies stretch upwards, penetrate through the upper partition board and are connected with the upper cavity, and a water inlet corresponding to each sleeve type rod-shaped fuel assembly is formed in the joint between the lower partition board and the sleeve type rod-shaped fuel assemblies in the reactor core. The reactor has the characteristics of simple system and high thermal efficiency; and the fuel assembly has the characteristics of being more uniform in moderation, simpler in structure and saving in uranium resources.

Description

technical field [0001] The invention belongs to the technical field of nuclear reactor engineering, and in particular relates to a casing-type rod-shaped fuel assembly and a supercritical water-cooled nuclear reactor using the assembly. Background technique [0002] Supercritical water-cooled reactors use supercritical water as the coolant and moderator. Supercritical water means that the pressure and temperature of water are higher than the quasi-critical point of water (22.12MPa, 374.3°C). It is characterized by no phase change, a single medium, and water temperature up to 510~620°C, so the thermal efficiency can reach 45%, which is 1 / 3 higher than the current popular pressurized water reactor, and the economy is good. Moreover, since supercritical water does not undergo phase change, compared with existing pressurized water reactors, supercritical water-cooled reactors do not require steam generators, main circulation pumps, pressurizers, steam-water separators and dryer...

AI Technical Summary

Problems solved by technology

[0008] In order to ensure uniform slowdown, the above scheme adopts different measures, which increases the complexity of components

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