Alternative concepts for the Bushehr Nuclear Power Plant Unit-1 WWER-type reactor decommissioning

In accordance with the 'General guidelines for NPP safely assurance' PNAE G-01-011 -97 (OPB-88/97), the organization operating a WWER NPP must develop a 'Program of NPP unit decommissioning' not later than 5 years prior to the end of the plant's design life and submit it to State supervision bodies. Because of the change of the BUSHEHR NPP unit-1 designer during its construction, the planning for the decommissioning should be preceded by a more complex examination by the commission assigned by the operating organization. On the basis of this complex examination, the operating organization will develop the details for decommissioning and prepare a safety analysis report for the decommissioning activities in order to receive a license. If the NPP unit must be decommissioned before the end of its design service life for any reason, it must be defined in a special program with consideration of actual unit state. Engineering solutions, measures and activities supporting decommissioning must be made at all preceding stages of service life. In this paper, two alternative concepts of decommissioning the BNPP unit -1 are described. Also details of the basic concept of decommissioning the unit and of the preliminary work required before BNPP unit-1 decommissioning can begin have been described. (author)