Method and system for comparing steam and water flow quantity measurement channels of nuclear power plant evaporator

The invention relates to a method and system for comparing steam and water flow quantity measurement channels of a nuclear power plant evaporator, wherein the method includes the steps: S1, formulating cross comparison standards by an uncertainty mean square root method; S2, collecting a real-time water flow measurement value of a main feed water flow quantity redundancy measurement channel of theevaporator and a real-time steam flow quantity measurement value of a steam flow quantity redundancy measurement channel; S3, determining a cross-comparison reference object of the steam and water flow quantity measurement channels; and S4, carrying out comparative operation of the real-time water flow quantity measurement value and the real-time steam flow quantity measurement value with the reference object, and carrying out cross comparison of the comparative operation results with the cross-comparison standards. The representational parameters and characteristics of the system or equipment are subjected to compar