Method and device for grading and lifetime management of nuclear power plant equipment

The invention provides a nuclear power plant equipment grading and lifetime management method and device, and the method comprises the steps: obtaining a target lifetime management detailed rule according to a target lifetime management general principle, and constructing a target logic tree between the target lifetime management general principle and the target lifetime management detailed rule; determining a grade number, and obtaining a target matrix which is a target of the target lifetime management general principle and the intervention activity in each grade; and according to the target logic tree and the target matrix, determining a threshold value of the target lifetime management detailed rule in each grade, so as to obtain a complete lifetime management grading result. According to the method and the device, the detailed rule for guiding equipment grading can be obtained by analyzing, splitting and refining the general principle of lifetime management, and the final grading management scheme is obt