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Abstract. A vertical cable routing on different trays has been observed as worst case in case of fire. PVC (polyvinyl chloride) or FRNC (fire retardant non-corrosive) polymers have been used as cable insulation materials for cables typically being installed in German NPP. Each experiment has been repeated under pre-heated conditions. A propane gas burner has been used for igniting cables and an ethanol pool for pre-heating. Two different types of fire simulation codes (one 'lumped parameter' code -COCOSYS -and two threedimensional computational fluid dynamics (CFD) codes -FDS and CFX) have been investigated with respect to their potential for predicting the experimental results. There were significant differences in the way of performing flame spread calculations in the codes. However, none of the models applied in the frame of this benchmark exercise was able to predict the cable flame spread in an adequate manner.

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Realistic modelling of fire scenarios is still difficult due to the scarcity of reliable data needed for deterministic and probabilistic fire safety analysis. Therefore, it has been recognized as highly important to establish a fire event database on an international level. In consequence, several member countries of the Nuclear Energy Agency of the OECD have decided in 2000 to establish the International Fire Data Exchange Project (OECD FIRE) to encourage multilateral co-operation in the collection and analysis of data related to fire events at nuclear power plants. This paper presents the OECD FIRE project objectives, work scope and current status of the OECD FIRE database after 3 years of operation as well as first preliminary statistical insights gained from the collected data.