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US-ABWR Design: Design Basis for External Events ■The US-ABWR SSCs important to safety are designed to withstand the effects of External Events US-ABWR 0.3g: Max. Horizontal ground acc. 0.3g: Max. Vertical ground acc. Earthquake Flooding (including 1 ft (0.3 m) below grade Tsunami) Tornado US Regulation GDC2 R.G.1.60 GDC2 R.G.1.59 R.G.1.102 GDC2 Hurricane 483 km/h (300mph) Addressed on site specific basis R.G.1.76 Rev 1 GDC2 R.G.1.221 Extreme wind 177 km/h: Non-Safety Related 197 km/h: Safety Related GDC2 TOSHIBA Copyright © 2012 Toshiba Corporation. All rights reserved. Leading Innovation >>> 15

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