Non-destructive assessment method for radiation damage of reactor pressure vessel in nuclear power plant

A non-destructive assessment method for the radiation damage of a reactor pressure vessel in a nuclear power plant, comprising the following steps: S01, monitoring in real time magnetic performance parameters of a certain monitored part of the steel of a reactor pressure vessel during a normal operation period of a nuclear power plant, the magnetic performance parameters being any one from among magnetic susceptibility χ, residual magnetization MR and coercivity HC; S02, on the basis of the measured magnetic performance parameters, calculating neutron radiation damage fluence Φ or mechanical properties of the reactor pressure vessel; S03, using the neutron radiation damage fluence Φ or the mechanical properties as analysis input parameters, performing safety assessment or service life prediction for the structural integrity of the reactor pressure vessel during a radiation damage process. The method may achieve real-time repeated non-destructive measurement, while data is accurate and test operations are safe; the present invention may simultaneously monitor the degree of radiation damage at multiple positions of the reactor pressure vessel.