Preliminary Research on Equipment Accessibility of Nuclear Power Plant

In a postulated severe accident, operators will conduct the accident mitigation management under the indication of SAMG. The harsh conditions induced by severe accidents such as extreme temperature, high pressure and high radioactivity may limit the personnel accessibility and cause uncertainty to the procedure of mitigation. In the paper, the equipment accessibility induced by high radioactivity is analyzed for AP1000. The results indicate that most of the mitigative actions can be carried out in main control room. In the limited cases in which equipments have to be operated locally, it is still possible to finish the mitigation action without too much radioactive exposure. Therefore, accessible trouble caused by high radioactivity will not produce a big threat to accident mitigation.