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research-article

Research on the Application of Fen for EAF Evaluation of the Austenitic SS Pipe under Combined Transient Loads

[+] Author and Article Information
Bingbing Liang

Shanghai Nuclear Engineering Research & Design Institute, No. 29 Hongcao Road, Shanghai 200233, PRC
lbb@snerdi.com.cn

Xu Zhang

Shanghai Nuclear Engineering Research & Design Institute, No. 29 Hongcao Road, Shanghai 200233, PRC
zhangxu9@snerdi.com.cn

Haifeng Yin

Shanghai Nuclear Engineering Research & Design Inst itute, No. 29 Hongcao Road, Shanghai 200233, PRC
yinhf@snerdi.com.cn

Yang Dai

Shanghai Nuclear Engineering Research & Design Institute, No. 29 Hongcao Road, Shanghai 200233, PRC
daiyang@snerdi.com.cn

1Corresponding author.

ASME doi:10.1115/1.4040368 History: Received October 30, 2017; Revised April 22, 2018

Abstract

Accumulative test data indicates that the effects of the light water reactor (LWR) environment could cause the fatigue resistance of primary pressure boundary components materials to be significantly reduced. EAF is the abbreviation of the environmentally assisted fatigue effects. In 2007, NRC issued RG. 1.207. It was updated in 2014. And it requires that the effects of LWR environment on the fatigue life reduction of metal components should be considered for new design plants. And it suggests to use environmental correction factor (Fen) to account for EAF. Fen=Nair/Nwater (N is occurrences). NUREG/CR-6909 [1] presents the detail Fen calculation formula. Fen is a function of temperature, strain rate, dissolved oxygen level in water, and sulfur content of the steel. Accordingly, Fen calculation will present a comparatively conservative result. Depends on the experience of the primary pressure boundary piping transient operation, Fen varies during each transient. More uncertainty and confusion are raised during the application of the Fen method. The research work in this article includes: first, the typical character of piping thermal transient is derived based on the existing experience. Second, small specimen EAF tests are conducted depend on the above derived combined loading characters. Then effort is taken to improve the application of the Fen method for the combined multi-transient loading conditions. And the results are compared with that of the lowest instantaneous Fen method and equalization of the weighted Fen method. Finally, a designed test plan is presented.

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