An overview of the Bruce A PRA (BAPRA)

As part of the basis for restart of Units 3 and 4, Bruce Power committed to complete a Bruce A Probabilistic Risk Assessment (BAPRA), prior to restart. NNC Limited of the UK, contracted to prepare BAPRA using Windows Risk Spectrum reliability software that provides an integrated event tree / fault tree approach representing international best practice. An NNC analysis team with extensive experience on preparing PRAs in the United Kingdom and Europe was supported by AECL analysts in the early months of model development. Expert review and support was provided throughout by Bruce Power staff in the areas both of PRA and Bruce A specific operating experience. This paper provides an overview of the methodology for and results from the BAPRA. (author)