A nuclear reactor pressure vessel lower head structure

Abstract

The invention discloses a novel nuclear reactor pressure vessel lower head structure, and belongs to the technical field of pressure vessels. The structure comprises a spherical head and a thermal insulation layer arranged out of the spherical head; the bottom of the thermal insulation layer is provided with a cylindrical hole, the cooling water can enter the cylindrical hole, a set of fins is vertically and alternately arranged on the external surface, a set of supportive embossments is arranged on the corresponding positions of the internal wall of the thermal insulation layer, the fins are above the supportive embossments, moreover, a gap exists between the fins and the supportive embossments, and if the spherical head is heated to expand, the fins move outwards and are supported by the supportive embossments. By arranging fins on the external wall of the spherical head, the heat exchange area is enlarged, and thus the heat transfer efficiency is increased. The external walls of the fins are provided with supportive embossments, moreover, a certain gap exists between the fins and the supportive embossments, and thus the RPV structural rigidity and strength are both enhanced. The provided structure has the advantages of simpleness, compactness, and high structural strength and rigidity, and is capable of increasing the safety and reliability of nuclear power.

Description

technical field [0001] The invention belongs to the technical field of pressure vessels, and in particular relates to a nuclear reactor pressure vessel lower head structure with high reliability, high heat transfer efficiency, high structural strength and rigidity, which can increase the safety and reliability of nuclear power. Background technique [0002] This device is generally used in the RPV structure of nuclear power. The RPV lower heads of active nuclear power equipment are all independent structures with smooth outer walls, and the heat transfer effect is not very ideal. Especially in extreme accident conditions, relying on the boiling heat transfer of the outer wall, It takes too long to remove the waste heat from the core within 72 hours, which poses a serious threat to the structural integrity of nuclear power. With the future increase of nuclear power, especially the investment and use of CAP1400 and CAP1700, the safety of nuclear power will be greatly reduced. ...

AI Technical Summary

Problems solved by technology

[0002] This device is generally used in the RPV structure of nuclear power. The RPV lower heads of active nuclear power equipment are all independent structures with smooth outer walls, and the heat transfer effect is not very ideal. Especially in extreme accident conditions, relying on the boiling heat transfer of the outer wall, It takes too long to remove the waste heat from the core within 72 hours, which poses a serious threat to the structural integrity of nuclear power. With the future increase of nuclear power, especially the investment and use of CAP1400 and CAP1700, the safety of nuclear power will be greatly reduced. Security will put forward more stringent requirements

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