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research-article

The influence of crust layer on RPV failure under pressurized core meltdown accident

[+] Author and Article Information
Jianfeng Mao

Institute of Process Equipment & Control Engineering, Zhejiang University of Technology, Hangzhou 310032, PR China; Engineering Research Center of Process Equipment and Re-manufacturing, Ministry of Education, PR China
maojianfeng@zjut.edu.cn

Shiyi Bao

Institute of Process Equipment & Control Engineering, Zhejiang University of Technology, Hangzhou 310032, PR China
bsy@zjut.edu.cn

Zhiming Lu

Institute of Process Equipment & Control Engineering, Zhejiang University of Technology, Hangzhou 310032, PR China
lzm@zjut.edu.cn

Lijia Luo

Institute of Process Equipment & Control Engineering, Zhejiang University of Technology, Hangzhou 310032, PR China
lijialuo@zjut.edu.cn

Zengliang Gao

Institute of Process Equipment & Control Engineering, Zhejiang University of Technology, Hangzhou 310032, PR China; Engineering Research Center of Process Equipment and Re-manufacturing, Ministry of Education, PR China
zlgao@zjut.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4040494 History: Received October 30, 2017; Revised April 23, 2018

Abstract

The RPV integrity is significantly influenced by the crust. A strong, coherent crust anchored to the RPV walls could allow the yet-molten corium to fall away from the crust as it erodes the RPV, therefore thermally decoupling the melt pool from the coolant and sharply reducing the cooling rate. Due to the thermal resistance of the crust layer, it somewhat prevents further attack of melt pool from the RPV. In the present study, the effect of crust on RPV structural behaviors was examined under multi-layered crust formation conditions with consideration of detailed thermal characteristics, such as high temperature gradient across the wall thickness. Thereafter, systematic finite element analyses (FEA) and subsequent damage evaluation with varying parameters were performed on a representative reactor pressure vessel (RPV) to figure out the possibility of high temperature induced failures with the effect of crust layer.

Copyright (c) 2018 by ASME
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