NUCLEAR POWER PLANT CONTROL SYSTEM AND ALTERNATIVE MONITORING AND CONTROL METHOD THEREOF

PROBLEM TO BE SOLVED: To furthermore improve the safety in the case that a nuclear power plant is flooded.SOLUTION: An alternative monitoring and control device is provided in a flood prevention area within a nuclear power plant, other than an area where a monitoring and control device is provided. When a switching device outputs status information from plant equipment such as a gauge, a valve, and a pump to the monitoring and control device, the monitoring and control device performs monitoring and control on the basis of the status information. Meanwhile, when the switching device switches from the monitoring and control device to the alternative monitoring and control device to output the status information from the plant equipment to the alternative monitoring and control device, the alternative monitoring and control device performs monitoring and control on the basis of the status information instead of the monitoring and control device. Since the output destination of the status information from the plant equipment can be switched between the monitoring and control device and the alternative monitoring and control device by the switching device, monitoring and control can be performed by the alternative monitoring and control device even in situations where it is difficult that monitoring and control are performed by the monitoring and control device, whereby the loss of control function in the nuclear power plant can be prevented.