Analysis of failure and maintenance experiences of motor operated valves in a Finnish nuclear power plant

Kaisa Simola, Kari Laakso

Research output: Book/ReportReport

Abstract

Operating experiences from 1981 up to 1989 of totally 104 motor operated closing valves (MOV) in different safety systems at TVO I and II nuclear power units were analysed in a systematic way. The qualitative methods used were failure mode and effects analysis (FMEA) and maintenance effects and criticality analysis (MECA). The failure descriptions were obtained from power plant's computerized failure reporting system. The reported 181 failure events were reanalysed and sorted according to specific classifications developed for the MOV function. Filled FMEA and MECA sheets on individual valves were stored in a microcomputer data base for further analyses. Analyses were performed for the failed mechanical and electrical valve parts, ways of detection of failure modes, failure effects, and repair and unavailability times.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages197
ISBN (Print)951-38-4054-9
Publication statusPublished - 1992
MoE publication typeNot Eligible

Publication series

SeriesVTT Tiedotteita - Meddelanden - Research Notes
Number1322
ISSN1235-0605

Keywords

  • nuclear power plants
  • failure analysis
  • valves

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  • Cite this

    Simola, K., & Laakso, K. (1992). Analysis of failure and maintenance experiences of motor operated valves in a Finnish nuclear power plant. VTT Technical Research Centre of Finland. VTT Tiedotteita - Meddelanden - Research Notes, No. 1322