Nuclear power generating sets system and its security monitoring method and apparatus

The invention is suitable for the field of safety control of nuclear power generating sets, and provides a nuclear power generating set system, a safety monitoring method and a device thereof. The system comprises an overall picture and a monitoring picture. The method comprises the following steps: in a failure state, displaying the overall picture which comprises pictures of running states of a plurality of devices related to the failure according to operation instruction; calling the corresponding monitoring pictures according to the running devices corresponding to the operation instruction; and displaying the called monitoring pictures. Through the embodiment of the invention, the invention saves large amount of time and vigor for coordinators to master the total state of the set and safely and effectively control the set, has simple process, and improves efficiency greatly.