Scientific support of regulatory decisions making on the base of risk assessment

The scope of nuclear energy use differs from other branches of industry by the gigantic concentration of energy in the elements of the nuclear objects. Therefore already during the designing of NPP the extraordinary technical and organizational measures are taken to prevent the emergency situations. Among these measures one should mention well-founded conservatism of the designs, triple reservation of the safety systems, 5 barriers of the defence in depth, the state systems of nuclear and radiation safety regulation, etc. On the basis of preliminary scientific studies GOSATOMNADZOR of Russia approved and declared a number of important decisions: adherence to the application of PSA in the regulatory activity together with other safety assessment and safety analysis methods; the demands of the necessary execution of PSA-1 are included in the current regulatory documents; the results of the PSA and methods of its execution are the subject of a systematic discussion with the operating organizations