PROCEDURES AND APPLICATIONS TO ENLARGE THE LEVEL-1-POWER-PLANTS( PSA TO INTERNAL FIRES IN GERMAN NUCLEAR)

Investigations have shown that the consequences from fires in nuclear power plants can be significant. Methodologies considering fire in pro babilistic safety analyses have been evolving in the last few years. I n order to provide a basis for further discussions on benefits and lim its of such an analysis in Germany, current methods are investigated. As a result a qualitative screening process is proposed to identify cr itical fire zones followed by a quantitative event tree analysis in wh ich the fire caused frequency of initiating events and different core damage states will be determined. The models and data proposed for a p robabilistic fire risk analysis have been successfully applied in comp lete and partial fire risk assessments in German nuclear power plants. (C) 1997 Published by Elsevier Science Limited.