THREE DIMENSIONAL RESPONSE BEHAVIOR OF UNIT NO.5 REACTOR BUILDING SUBJECTED TO THE NIIGATAKEN CHUETSU-OKI EARTHQUAKE IN 2007

Abstract

This paper presents three dimensional behavior of Unit No.5 reactor building of the Kashiwazaki-Kariwa Nuclear Power Station subjected to the Niigataken Chuetsu-oki Earthquake in 2007, in which acceleration 4.4m/s² was recorded at the base mat. The behavior was studied for stress distribution of walls, acceleration distribution on floors and earth pressure distribution of an embedded building. The back ground of this study is increasing attention to safety of nuclear power plants subjected to large earthquakes. The damage anticipated there may be localized failure. To evaluate it, three dimensional analytical method and model were used. They were validated with 25 acceleration records of the Mid Niigata Prefecture Earthquake in 2004 before studying the three dimensional behavior.