The fire and explosion assessment is necessary for NPP to evaluate the effect caused by malicious large commercial aircraft impact. This report focuses on the fire and explosion effect on shield building structure of nuclear island according to the impact screening. With the investigation and analysis for the fire and explosion of aircraft impact, a simple and effective method was established. With this method the pool fire and fire explosion are analyzed and their effects on shield building structure are assessed based on the temperature and pressure distribution obtained from the FEA model.

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