Study on Dose Criteria in Safety Classification of Nuclear Power Plant Items

In the design of nuclear power plant, the safety classification of items is carried out to ensure that the design, manufacturing and construction of the items meet appropriate requirements and that the reliability consistent with their functions can be achieved. This paper briefly describes the method of safety classification of nuclear power plant items according to safety importance and the factors that should be considered. For the consequences of failing to perform a safety function that should be considered in the safety classification of the items, the dose criteria for the public and staff under different working conditions of nuclear power plant are used to divide them into high, medium and low consequences. Through the study, some suggestions on the quantification of high, medium and low radioactive consequences are put forward so as to make this method more operable in the safety classification of nuclear power plant items.