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This report summarises results, obtained by the participants in the Reliability Benchmark Exercise on Common Cause Failures (CCF-RBE). The CCF-RBE was organised by the Joint Research Centre of the European Communities in Ispra (J.R.C.-Ispra). The need to organise a Benchmark Exercise on Common Cause Failure Analysis was identified during the first Reliability Benchmark Exercise on Systems analysis. The number and quality of the participants in the CCF- RBE, and their very active involvement illustrate the interest of the technical community in this kind of activities. The reference power plant of the CCF-RBE was the NPP at Grohnde (KWG): it is a 1300 MW PWR plant of KWU design and operated by the utility "Preussen Elektra'. The systems studied were the Start-up and Shut-down system (RR/RL) and the Emergency Feedwater System (RS) both systems that can feed water into the steam generators in the emergency power mode. The CCF-RBE was organised in two phases: 1. The first phase: during which all participants have performed an analysis on the complete system as defined by the assumed boundaries, i.e. the Start-up and Shut- down system (RR/RL0 and the Emergency Feedwater System (RS). 2. The second phase: in which the scope was limited to the RS system. This limitation in scope was agreed upon in the discussion on the results of the first phase, which showed that, within the boundaries of the exercise, RR/RL and RS systems could be considered independent of each other. This report gives an overview of the works carried out, the results obtained and the conclusions and lessons that could be drawn from the CCF-RBE

Additional information

Bibliographic Reference: EUR 11054 EN (1987) MF, 135 P., BFR 300, BLOW-UP COPY BFR 675, EUROFFICE, LUXEMBOURG, POB 1003
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