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http://dx.doi.org/10.20466/KPVP.202.18.1.019

Leak Before Break Evaluation of Surge Line by Considering CPE under Beyond Design Basis Earthquake  

Seung Hyun Kim (한국전력기술(주) 원자로설계개발단)
Youn Jung Kim (한국전력기술(주) 원자로설계개발단)
Han-geol Lee (한국전력기술(주) 원자로설계개발단)
Sun Yeh Kang (한국전력기술(주) 원자로설계개발단)
Publication Information
Transactions of the Korean Society of Pressure Vessels and Piping / v.18, no.1, 2022 , pp. 19-25 More about this Journal
Abstract
Nuclear Power Plants (NPP) should be designed to have sufficient safety margins and to ensure seismic safety against earthquake that may occur during the plant life time. After the 9.12 Gyeongju earthquake accident, the structural integrity of nuclear power plants due to the beyond design basis earthquake is one of key safety issues. Accordingly, it is necessary to conduct structural integrity evaluations for domestic NPPs under beyond design basis earthquake. In this study, the Level 3 LBB (Leak Before Break) evaluation was performed by considering the beyond design basis earthquake for the surge line of a OPR1000 plant of which design basis earthquake was set to be 0.2g. The beyond design basis earthquake corresponding to peak ground acceleration 0.4g at the maximum stress point of the surge line was considered. It was confirmed that the moment behaviors of the hot leg and pressurized surge nozzle were lower than the maximum allowable loading in moment-rotation curve. It was also confirmed that the LBB margin could be secured by comparing the LBB margin through the Level 2 method. It was judged that the margin was secured by reducing the load generated through the compliance of the pipe.
Keywords
Beyond Design Basis Earthquake; Cracked Pipe Element; Double Ended Guillotine Break; Leak Before Break; Surge Line;
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