Seismic Re-evaluation of Existing Nuclear Power Plants, An Introduction to anIAEA Safety Report

摘要

The purpose of this paper is to introduce the IAEA Safety Report under preparation on the Seismic Reevaluation ofrnexisting Nuclear Power Plants (NPPs). After an introduction on the objectives of the IAEA document and the commonrntechnical background of seismic re-evaluation, the outlines of the seismic re-evaluation process are discussed: the review levelrnearthquake, the safety analysis of the plant as it should be considered in view of a seismic re-evaluation, the use of thernfeedback experience and the practice of walkdown. A special emphasize is given to the capacity evaluation, including somernrecommendations about non linear analyses and consequences of non linear behaviour on the seismic response. It is proposedrnto account for post elastic behaviour by the way of"Energy Absorption Factors", provided actual ductile capacity is available.