Оперативний імовірнісний аналіз безпеки атомної електростанції, що працює в екстремальних умовах

The problem of rapid risk assessment for nuclear power plant operation under extreme conditions, which may significantly affect nuclear and radiation safety, is considered. Based on a probabilistic safety analysis approach, a methodology has been developed to evaluate accident risk. Its application enables plant personnel to quickly make decisions on the need to reduce the reactor power or shut down the power unit in the event of circumstances that could seriously compromise operational safety. A formula for calculating the maximum permissible reactor power at which the plant can continue to operate in extreme conditions is obtained. It is shown that in cases of events posing substantial risk and potentially leading to accidents, shutting down the unit is advisable, as safety limits may otherwise be exceeded.