Calculation of Core Damage Frequency Caused by Main Control Board Fire in the Main Control Room for Small Modular Reactors

Fire accidents have had an adverse impact on nuclear safety in nuclear power plants. Fire probabilistic safety assessment, as one of the most important methods for safety analysis, has played an essential role in fire risk in nuclear power plants. Main control rooms normally contain many cabinets equipped with all kinds of cables. Once cables there get burned, if not tackled immediately in an appropriate way, they would possibly cause severe consequences. In order to assess the fire risk in the referenced main control room (MCR) for a small modular reactor, this study used the software, CFAST, to simulate fire scenarios caused by the main control board in the MCR, and use the software, Risk Spectrum, to calculate the Core Damage Frequency (CDF). The calculation results show that CDF caused by the main control board (MCB) is 6.112E−09/year.