Characteristics of Strong Motion Records in Kashiwazaki-Kariwa Nuclear Power Station during the Niigataken Chuetsu-Oki Earthquake in 2007

Abstract eng:
THE NIIGATAKEN CHUETSU-OKI EARTHQUAKE OF M6.8 OCCURRED AT 16 KM FROM THE KASHIWAZAKI-KARIWA NUCLEAR POWER STATION ON JULY 16, 2007. ALL REACTORS IN OPERATION AUTOMATICALLY SHUTDOWN AS DESIGND AND THE STRONG MOTION DURING THE QUAKE WERE OBSERVED AT MANY POINTS IN THE SITE. THE MAXIMUM ACCELERATION OBSERVED ON THE BASE MAT OF REACTOR BUILDING WAS 680 CM/S2 AT UNIT 1. THE PEAK ACCELERATION VALUES IN EAST-WEST COMPONENTS WERE LARGER THAN THAT OF NORTH-SOUTH COMPONENTS AND THE PEAK ACCELERATION VALUES IN SOUTH SIDE OF THE SITE WERE LARGER THAN THAT IN NORTH SIDE. THE WAVEFORMS HAVE SHORT DURATION ABOUT 10 SECONDS AND THREE SIGNIFICANT PULSES ARE IDENTIFIED IN THE WAVEFORM. THESE PULSES ARE ASSUMED TO ASPERITY PULSES. THE THIRD PULSE FROM THE ASPERITY LOCATED THE WEST OF THE SITE AFFECTED THE PEAK ACCELERATION CHARACTERISTICS. THE THIRD PULSE WAS AMPLIFIED BY THICK NEOGENE STRATUM AND FOLD GROUND STRUCTURE IN THE SITE. IT SEEMS TO BE THAT THE HIGH ACCELERATION AND SPATIAL VARIATION OF THE OBSERVED RECORDS IN THE SITE ARE DUE TO BOTH EFFECTS OF SEISMIC SOURCE AND GROUND CONDITION. THE NIIGATAKEN CHUETSU-OKI EARTHQUAKE, NUCLEAR POWER STATION,

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