Methodology of period safety review for seismic qualification of equipment in operating nuclear power plants

According to Korean nuclear energy act, the safety review should be performed for operating nuclear power plants every ten year. In case of other countries, the review for seismic qualification of equipment is included in Periodic Safety Review (here in after called 'PSR') of IAEA Safety Series. With the PSR of Kori Nuclear Power Plant (here in after called 'NPP') unit 1 beginning in May 2001, the PSR of Wolsong NPP unit 1 and Kori NPP units 2, 3, 4 were performed, and now the PSR of Yonggwang NPP units 1, 2, 3, 4 are performing. The PSR of Ulchin NPP units 1, 2 will be started soon. As the scope of seismic PSR is six items related to equipment qualification on Korean nuclear energy act, the purpose of this paper is to contribute to guarantee of safety in operating NPPs through PSR. In this paper, the overall methodology of PSR for seismic qualification of equipment will be introduced in operating NPPs including induction of safety enhancement. And also the control plan and procedure will be suggested as induced safety enhancement through seismic PSR