Application of probabilistic safety analysis to the long term safety review of Latina nuclear power station

The Latina nuclear power station comprises a single gas cooled graphite moderated MAGNOX reactor designed by NNC and commissioned in 1962. As with similar reactors in the UK, the station is approaching its initially forecast design life and has been subject to comprehensive reviews of reactor safety as part of the justification for future operation. A probabilistic safety approach has been adopted in these reviews to provide guidance as to the adequacy of the engineered safety systems and the benefit of possible modifications which have been considered with the objective of improving the level of safety. This paper describes the basis of these probabilistic studies, the insights to safety they have given and their value in establishing the adequacy of the safety case and confirming the most appropriate modifications giving the maximum safety benefit. (orig.)