Failure Data Process Considering Trend of Failure Rate for Repairable Equipments in Nuclear Power Plants

To solve the problem of failure data processing for reliability assessment for repairable facilities in nuclear power plants,a improved approach based on the renewal theory,trend testing and Weibull process（a kind of NHP）is proposed.After analyzing the error risk of traditional life data processing methods,an actual example is calculated based on the failure data of water-cooling pumps in generator stator at some nuclear power stations to compare the two processing methods.The result proves that Weibull process fitting reflects the failure characteristics of repairable equipments failures with less complicate calculation process.