Safety system of nuclear power plant

The invention provides a safety system of a nuclear power plant. The safety system comprises an upper computer, a fire alarm assembly and a hydrogen alarm assembly; the fire alarm assembly comprises afire alarm controller and a fire detector, the fire detector is electrically connected with the fire alarm controller, and the upper computer is in ring connection with the fire alarm assembly; the hydrogen detection assembly comprises a hydrogen alarm controller and a hydrogen detector, the hydrogen detector is electrically connected with the hydrogen alarm controller, and the hydrogen alarm detector is electrically connected with the fire alarm controller. According to the embodiment of the invention, the hydrogen alarm assembly is connected with the fire alarm assembly, so that hydrogen alarm and fire alarm linkage can be realized, and the structure is simpler; meanwhile, the upper computer is connected with the fire alarm assembly in a looped manner, and communication connection can still be realized through