Abstract
Risk informed regulation for Nuclear Power Reactor is adopted widely in the U.S. In the U.S., reactor core damage frequency(CDF) is used as risk information. An acceptable value is prepared in the increment of a risk (CDF), and various actions such as online-maintenance or RI-ISI are permitted within the acceptable value. The permission time (AOT: Allowed Outage Time) when a plant can carry out continuous operation when one line of a redundant system breaks down can also utilize and search for risk information. In this report, the contents examined by the NUPEC(Nuclear Power Engineering Corporation ) are reported about the evaluation method of AOT which utilized risk information, and it proposes about future practical use.
