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디지털 원자로 보호시스템에 대한 신뢰도 및 가용도 평가
공명복 ( Myung Bock Kong ),이상용 ( Sang Yong Lee ) 한국경영공학회 2011 한국경영공학회지 Vol.16 No.3
Reactor protection system(RPS) is an important safety-related facility. RPS shutdowns a nuclear reactor as well as actuates engineered safety features to prevent the release of radioactive materials when nuclear reactor is in an abnormal condition. RPS has a feature of redundant design to meet high reliability. However, the failure of the RPS itself has to stop the reactor for safety so that it causes forced outage of the nuclear power plant. Forced outage incurs economic loss not to produce electricity. Therefore, the failure of RPS should be repaired soon. Thus, the availability analysis for RPS is required to decide regarding the repair of it. The paper evaluates the reliability and availability for the designed digital RPS. Reliability block diagram(RBD) analysis of Relex software is used to calculate them.
디지털 원자로 보호시스템의 공통원인고장 분석에 관한 사례연구
공명복(Myung-Bock Kong),이상용(Sang-Yong Lee) 대한산업공학회 2012 산업공학 Vol.25 No.4
Reactor protection system to keep nuclear safety and operational economy of plants requires high reliability. Such a high reliability of the system can be achieved through the redundant design of components. However, common cause failures of components reduce the benefits of redundant design. Thus, the common cause failure analysis, to accurately calculate the reliability of the reactor protection system, is carried out using alpha-factor model. Analysis results to 24 operating months are that 1) the system reliability satisfies the reliability goal of EPRI-URD and 2) the common cause failure contributes 90% of the system unreliability. The uncertainty analysis using alpha factor parameters of 0.05 and 0.95 quantile values shows significantly large difference in the system unreliability.