The Reliability Analyses About Lose Of 48V DC Voltge Of Qinshan Second Power Plant

Mar.1979 in Three Islands Nuclear power plant occur a reactor core damage severe event .It cause people to recognize the important of using of PSA in nuclear power plant. PSA is widely applied in nuclear power plant recently .According to the requisition of HA F102(Apr.18,2004),PSA is used for a assistant and mending method of confirm method in Qinshan phase .Dc power is very important for the system's supervising,adjusting,control and protect function,any losing of the DC power will cause the risking of the nuclear core damage."Losing of the LCA 48V DC power"is considered as the original case in this thesis .The event is analysed by ETA.And apply the event tree,confirm the event sequence of the CD(core damage).By the way ,choose the invalidation of the"recycle of the EAS"to constructed the fault tree .The issue select RS(Risk-Spectrum) as the analyse software ,the frequency's data of the original case reference the EPS900PSA of the France and the Bayesian method.The event tree analysis reference the report of the CNP1000PSA which afforded by France. The fault tree analysis reference the other reports and the experience.In the fault tree analysis project, currency data of the reliability database choose from the EPS900 PSA report of the France,and the data reinforced by CNP1000 PSA report's reliability data.Rely on the working of the China nuclear design institute ,HRA data of the beforehand confirmed by ASEP method, HRA data of the afterwards confirmed by THERP+HCR method.Finally,complete the ration and qualitative analysis to the fault tree and event tree by RS software. By the analysis result ,summarize some pertinence improvement about the management and the technology,in order to improve the safty of the nuclear power plant. At last,I hope the research of the PSA issue can supply a good case for the PSA analysis project of Qinshan phase .And the same I wish the issue can do benefit to the nuclear safety and economy of Qinshan phase.