[1J01-03] Analysis Technology 1

[1J02] Development of Fire Zone Model BRI2-CRIEPI

(2) Multiple fire source model

*Koji Tasaka¹, Junghoon Ji¹, Toshiko Udagawa², Koji Shirai¹ (1. CRIEPI, 2. WDB Co., Ltd.)

Keywords:fire zone model, compartment fire, multiple fire source model, mechanical ventilation, seismic induced fire

In fire probabilistic risk assessment for nuclear power plants, there are some cases in which it is necessary to consider multiple fire source scenarios like seismic induced fire events. This paper describes the simulation results of multiple fire source scenarios in a mechanically ventilated condition with the fire zone model BRI2-CRIEPI. One of the most important insights is that the total of fire heat release rate with multiple fire source scenario is increased than single fire source scenario but it is not proportional to the number of fire sources. Because in case of the ventilation-controlled fire scenarios, the vitiation of oxygen in the fire compartments leads to reduce the combustion efficiency of each fire source.