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DOE 2000. - Waste Isolation Pilot Plant - U.S. Department of Energy

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WIPP RH PSAR <strong>DOE</strong>/WIPP-03-3174 CHAPTER 1<br />

Based on the results <strong>of</strong> the HAZOP, 12, 13 operational events are binned into three accident categories (fire,<br />

explosion, and breach <strong>of</strong> waste canister/drum). Since breach <strong>of</strong> waste canisters may occur due to drop or<br />

vehicle impact, accidents involving both <strong>of</strong> these breach mechanisms are evaluated. Accidents involving<br />

waste container drops are further evaluated based on the energy involved due to drop height. Due to the<br />

differences in release and dispersion mechanisms possible, accidents <strong>of</strong> each category are evaluated for<br />

surface and underground areas <strong>of</strong> the facility. Natural initiating events including seismic and tornado are<br />

also evaluated.<br />

Since the performance <strong>of</strong> the HAZOPs, periodic updates <strong>of</strong> the WIPP Fire Hazards Analysis Report<br />

(FHA) 24 have been performed to meet the requirements <strong>of</strong> <strong>DOE</strong> O 420.1. 5 The updated FHA confirms<br />

the previous evaluation that the frequency <strong>of</strong> a room or structural fire, as an accident in the WHB<br />

resulting in a direct release <strong>of</strong> radioactive material from the waste containers engulfed in the fire, is<br />

beyond extremely unlikely (

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