The Radiation Exposure Assessment during Decommissioning

A Korea Hydro & Nuclear Power Co., Ltd as a utility should design a decommissioning plan. Also, all of other nuclear power plants, nuclear fuel cycle facilities and other nuclear facilities are demanded to prepare preliminary and final decommissioning plan. Especially, safety assessment during decommissioning was highlighted for design the decommissioning plan, IAEA established a forum for the sharing and exchange of national information in 2004. In this study, external exposure is performed as a part of safety assessment. According to this research, utility or organization can satisfy dose limitation on regulation as controlling a man-power and working period. For example, man-power and working period is set up 8 man and 1.6 year in sequence 5 and 6 which has most severe condition during decommissioning, exposure dose satisfy under the 20 mSv/year on NSSC notification. The results of this research will also contribute to design the preliminary and final decommissioning plan of nuclear fuel cycle facilities which don't occur activation.