Features, Limitations and Uncertainties in Enclosure Fire Hazard Analyses:Preliminary Review

摘要

This report presents a review of three fire modeling tools (FIVE, COMPBRN III,CFAST) currently being used in fire safety design and a fourth model (LES) of the field model type which is beginning to be used in fire protection engineering. This review forcuses on the application potential for these models in the nuclear power industry. In view of the uncertainties associated with fire modeling predictions, extreme care must be excerised in the interpretation of fire modeling results. For scenarios where the level of predicted hazard is well below the damage threshold, the results can be used with a high level of confidence provided there is a high level of confidence that all risk-significant scenarios have been considered. For scenarios where the level of predicted hazard is near the damage threshold, the results should be used with caution in view of the uncertainties that exist. In order to address some of the uncertainties inherent in the current state of fire modeling, a multi-tiered approach is proposed which combines professional judgement, correlations, zone modeling, and field models.