Reactor pressure vessel lower seal head with porous coating on outer wall surface

A porous coating and pressure vessel technology, applied in the field of reactor pressure vessel lower head, can solve problems such as threats to the integrity of the containment vessel

Pending Publication Date: 2020-11-27
SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After a serious accident in a pressurized water reactor nuclear power plant, the core melted down, which may further lead to pressure vessels, seriously threatening the integrity of the containment

Method used

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  • Reactor pressure vessel lower seal head with porous coating on outer wall surface

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Embodiment

[0019] Such as figure 1 As shown, the reactor pressure vessel lower head with a porous coating on the outer wall of the present invention includes a bowl-shaped shell structure and a fixed porous coating 20 on the outer wall. The porous coating 20 is formed by spraying stainless steel powder.

[0020] In this embodiment, the bowl-shaped shell structure includes a barrel body 11 and a lower head 12 , and the lower head 12 is connected to the bottom of the barrel body 11 .

[0021] In this embodiment, the porous coating 20 is provided on all or part of the outer wall of the bowl-shaped housing structure.

[0022] In this embodiment, the porous coating 20 is formed by cold spraying or thermal spraying of stainless steel powder.

[0023] In this embodiment, the porosity of the porous coating 20 is 35-55%, and the thickness of the porous coating 20 is 200-500 microns.

[0024] The main process of the spraying process of the lower head of the reactor pressure vessel with a porous ...

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Abstract

The invention aims at disclosing a reactor pressure vessel lower seal head with a porous coating on the outer wall surface. The reactor pressure vessel lower seal head comprises a bowl-shaped shell structure and a porous coating fixed on the outer wall, and the porous coating is formed by spraying stainless steel powder. Compared with the prior art, the number of vaporization cores can be greatlyincreased, and the bubble nucleation speed is increased; the heat exchange area is increased; bubbles are enabled to grow up and escape, localized fluid is stirred to enhance surface convection, and the heat exchange capability of the fluid and the outer wall surface of the reactor pressure vessel is enhanced; and compared with a smooth outer surface, the critical heat flux density of fluid at thecorresponding position of the outer wall surface of the reactor pressure vessel can be improved by 50% or above, implementation of in-reactor retention of in-reactor melts is facilitated, the safetymargin of a nuclear power plant under the accident condition can be improved, and the purpose of the invention is achieved.

Description

technical field [0001] The invention relates to a reactor pressure vessel lower head, in particular to a reactor pressure vessel lower head with a porous coating on the outer wall of a nuclear reactor in a pressurized water reactor nuclear power plant. Background technique [0002] The reactor pressure vessel is an important equipment in the primary circuit system of the pressurized water reactor nuclear power plant, and it is a pressure-bearing and sealed boundary. After a severe accident in a pressurized water reactor nuclear power plant, the core melted down, which may further lead to pressure vessels, seriously threatening the integrity of the containment vessel. In the event of a core melting accident, water is injected into the reactor cavity to cool the outer wall of the reactor pressure vessel, so that the heat of the molten pool can be exported to maintain the integrity of the pressure vessel, thereby retaining the radiation material in the reactor pressure vessel (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C13/028G21C13/06
CPCG21C13/028G21C13/06Y02E30/30G21C13/08G21C9/016G21C21/00G21C13/073
Inventor 矫明徐宏史志龙侯峰刘晓强张莉刘润发徐鹏王弘昶翁娜王世杰
Owner SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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