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| Study of the Rapid Evaluation Method for Locally Wall-Thinned Pipe of Nuclear Power Plant |
| Received:June 21, 2021 Revised:July 29, 2021 |
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| DOI：10.7643/issn.1672-9242.2022.01.016 |
| KeyWord:pipe local thinning RCC-M integrity functionality rapid evaluation |
| Author | Institution |
| QIN Quan-ning |
Taishan Nuclear Power Joint Venture Co., Ltd., Jiangmen , China |
| WU Hai-hui |
Taishan Nuclear Power Joint Venture Co., Ltd., Jiangmen , China |
| LIU Bo |
Taishan Nuclear Power Joint Venture Co., Ltd., Jiangmen , China |
| CHEN Ming-ya |
Suzhou Nuclear Power Research Institute, Suzhou , China |
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| Abstract: |
| The purpose of this paper is to get a rapid and reliable engineering method to evaluate the safety of local thinned pipeline in nuclear power plants. The research method of this paper is based on the basic requirements in the design code of RCC-M and the experience of engineering practical, and three engineering hypotheses are assumed. A method of rapid evaluation for local thinned pipeline is proposed which includes three parts:1) calculation of minimum wall thickness; 2) structural integrity evaluation; 3) functional evaluation. Both the rapid evaluation method for locally thinned pipe and the finite element analysis method of SYSPIPE software are used to analyze the study case. The results show that:1) the minimum wall thickness meets the requirements; 2) the maximum stress ratio deviation is 0.26 under the normal condition, 0 under design condition, 0.04 under emergency condition, 0.03 under disturbance condition, and 0.03 under accident condition, respectively; 3) In the pipeline functional analysis, the deviation of primary stress ratio is 0 and the deviation of secondary stress ratio is 0.27, respectively. The rapid assessment method of pipe wall thickness thinning is safer and more conservative than the SYSPIPE software analysis in the normal working conditions of the pipeline integrity assessment and the secondary stress assessment of the pipeline functional analysis. And the calculation results of the two methods are basically consistent in other conditions. The method proposed in this paper is a general engineering practice, and it has be applied in many nuclear power stations in China, and it provides a rapid and reliable technical analysis method for the actual operation of power plants. |
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