This paper presents an overview of Russian regulatory basis for extension of the service life of NPP units in Russia. The regulatory documents are being developed in the frames of Russian National IAEA Project. Russian regulatory approaches are in compliance with international practice, Russian principles of nuclear and radiation safety regulation conform the present Russian reality. The paper presents information about new Safety Rules and Guides. Problematic issues concerning improvement of Russian regulatory basis are presented and analyzed. Additional period of the NPP unit operation is defined by the period of operation of its critical equipment. If critical equipment has a very short additional period of operation, modernization and reconstruction of the equipment is required for extension of the NPP service life. Aspects of probabilistic safety analysis are discussed, taking into account effects of modernization. The paper also presents effective technical and administrative measures of ensuring safety during additional period of NPP units operation in Russia.

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