Kling, Terhi

Korhonen, Timo

Tyrväinen, Tero

English

This report continues the probabilistic fire risk analysis study on nuclear power plant cable room fire. The scenario has been modelled using a simulation-based event tree in FinPSA software. The main components of the model are Monte Carlo fire simulations and a stochastic operation time model for firefighting. In this report, the dependencies between fire brigade actions and fire progression are explored further.A large number of uncertainties are identified for the case study. The most significant uncertainties are related to some fire simulation parameters (particularly time of maximum heat release rate), reliability of the automatic suppression system and some central firefighting actions.Reliability analysis of sprinkler systems is studied by reviewing previous analyses found in the literature and conducting a simplified fault tree analysis for a generic wet pipe system. Such reliability analyses have been quite rare or at least not published. Collection of sufficient amount of failure data for sprinkler system components is necessary for credible reliability analysis.Some new modelling issues are considered from the point of view of simulation-based event tree modelling. Modelling of multiple consequences, such as multiple cable failures, is relatively straightforward as demonstrated by a simple modelling example. Multiple fire brigades could also well be incorporated to the operation time model given that sufficient information about time delays exist

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Extensions to cable room fire PRA study and method

https://cris.vtt.fi/files/43683452/VTT_R_01545_20_Extensions_to_cable_room_fire_PRA_study_and_method_signed.pdf

Extensions to cable room fire PRA study and method

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