Study on Advanced PWR NPP Safety Related Equipment Qualification Function Requirement Design Methodology

In order to guarantee NPP operation safety, it is necessary to ensure the reliability operation of safety related equipment by equipment qualification. In the past, plant equipment qualification function requirement is an envelope requirement based on engineering experience, and it is not beneficial to NPP economical efficiency. These days, representative Gen III NPP (e.g. AP1000 and EPR) adopt improved technology in equipment qualification function requirement design, and more accurate requirement is designed. In this paper, AP1000 and EPR equipment qualification function requirement design methodology is studied and analyzed as the first step. Then, a safety related equipment qualification function requirement design methodology which is applicable for China self intellectual property Gen III NPP is provided. Furthermore, an example of equipment qualification function requirement design is carried out by analyzing nuclear instrument system power range channel sensor.