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Categorization of Motor Operated Valve Safety Significance for Its Periodic Safety Verification  

Sung, Tae-Young (Korea Atomic Energy Research Institute)
Kim, Kil-Yoo (Korea Atomic Energy Research Institute)
Kang, Dae-Il (Korea Atomic Energy Research Institute)
Publication Information
Journal of the Korean Society of Safety / v.17, no.2, 2002 , pp. 92-99 More about this Journal
Abstract
Safety-related motor operated valve(MOV) safety significance for Ulchin Unit 3 was categorized. The safety evaluation of MOV of domestic nuclear power plants affects the generic data used for the quantification of MOV common cause failure(CCF) events in Ulchin Units 3&4 PSA. Therefore, in this paper, MGL(multiple greek letter)parameter ${\beta}$, used for the evaluation of MOV CCF probabilities in Ulchin Units 3&4 probabilistic safety assessment(PSA), was re-estimated and the MOV safety significance was categorized. The re-estimation results of MGL parameter show that the value of(is decreased by 30% compared with the current value used in Ulchin Unit 3&4 PSA. The categorization results of MOV safety significance using the changed value of MGL parameter(show that the number of HSSCs(high safety significant components) is decreased by 54.5% compared with those using the current value of it used in Ulchin Units 3&4 PSA.
Keywords
nuclear power plant; motor operated valve; probabilistic safety assessment; common cause failure; importance analysis;
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