ROLE OF PASSIVE SAFETY SYSTEMS IN PREVENTION AND MITIGATION OF SEVERE ACCIDENTS AT NUCLEAR POWER PLANTS

Fukushima Daiichi accidents led to the worldwide update of NPP safety requirements. Particular attention was paid severe both during design new units and reassessment existing ones. Performed operating focused on development implementation technical means strategies directed prevention and/or mitigation accidents. Technical solutions that are used in modern designs reactor facilities involve several options for providing heat removal from core containment. Such include systems containment facility. Most such based passive principals operation do not require or a minimum action personnel. At same time, operated Ukraine old VVER designs, which long-term (especially case total station blackout, focus reassessments, so-called “stress tests”). Thus, necessity at Ukrainian NPPs with VVER-1000 VVER-440 discussed together analysis types their prevalence. Based results performed feasibility system confinement identified. The possibility requires separate analysis. In addition, general information current state reliability assessment described. It should be noted despite is one important issues it still poorly studied additional analyses.