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- 저자 : 성기열(Ki-Yeoul Seong) (검색결과 1 건)
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임혁순(Hyuk-Soon Lim),이은찬(Eun-Chan Lee),이근성(Keun-Sung Lee),황석원(Seok-Won Hwang),성기열(Ki-Yeoul Seong) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Recently, nuclear power plant companies have been extending the turbine valve test interval to reduce the potential of the reactor trip accompanied with a turbine valve test and to improve the NPP's economy through the reduction of unexpected plant trip or decreased operation. In these regards, the extension of the test interval for turbine valves was reviewed in detail. The effect on the destructive overspeed probability due to the test interval change of turbine valves is evaluated by Fault Tree Analysis(FTA) method. Even though the test interval of turbine valves is changed from 1 month to 3 months, the analysis result shows that the reliability of turbine over speed protection system meets acceptance criteria of 1.0E-4/yr. This result will be used as the technical basis on the extension of the test interval for turbine valves. In this paper, the propriety of the turbine valve test interval extension is explained through the review on the turbine valve test interval status of turbine overspeed protection system, the analysis on the annual turbine missile frequency and the probability evaluation of the destructive overspeed due to the test interval extension.
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