March21_JapanSeminar

March21_JapanSeminar - March 21, 2011 The Nuclear Crisis in...

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The Nuclear Crisis in Japan Daniel Okimoto Alan Hanson Kate Marvel March 21, 2011
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The Fukushima Daiichi Incident – March 21, 2011 The Fukushima Daiichi Incident 1. Plant Design 2. Accident Progression 3. Radiological releases 4. Spent fuel pools
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The Fukushima Daiichi Incident – March 21, 2011 The Fukushima Daiichi Incident 1. Plant Design Fukushima Daiichi (Plant I) Unit I - GE Mark I BWR (439 MW), Operating since 1971 Unit II-IV - GE Mark I BWR (760 MW), Operating since 1974
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The Fukushima Daiichi Incident – March 21, 2011 The Fukushima Daiichi Incident 1. Plant Design nucleartourist.com en.wikipedia.org/wiki/Browns_Ferry_Nuclear_Power_Plant Building structure Concrete Building Steel-framed Service Floor Containment Pear-shaped Dry-Well Torus-shaped Wet-Well
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The Fukushima Daiichi Incident – March 21, 2011 The Fukushima Daiichi Incident 1. Plant Design Service Floor
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The Fukushima Daiichi Incident – March 21, 2011 The Fukushima Daiichi Incident 1. Plant Design Lifting the Containment closure head
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The Fukushima Daiichi Incident – March 21, 2011 The Fukushima Daiichi Incident 1. Plant Design Reactor Service Floor (Steel Construction) Concrete Reactor Building (secondary Containment) Reactor Core Reactor Pressure Vessel Containment (Dry well) Containment (Wet Well) / Condensation Chamber Spend Fuel Pool Fresh Steam line Main Feedwater
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The Fukushima Daiichi Incident – March 21, 2011 The Fukushima Daiichi Incident 2. Accident progression 11.3.2011 14:46 - Earthquake Magnitude 9 Power grid in northern Japan fails Reactors itself are mainly undamaged SCRAM Power generation due to Fission of Uranium stops Heat generation due to radioactive Decay of Fission Products After Scram ~6% After 1 Day ~1% After 5 Days ~0.5%
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The Fukushima Daiichi Incident – March 21, 2011 The Fukushima Daiichi Incident 2. Accident progression Containment Isolation Closing of all non-safety related Penetrations of the containment Cuts off Machine hall If containment isolation succeeds, a large early release of fission products is highly unlikely Diesel generators start Emergency Core cooling systems are supplied Plant is in a stable save state
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The Fukushima Daiichi Incident – March 21, 2011 The Fukushima Daiichi Incident 2. Accident progression 11.3. 15:41 Tsunami hits the plant Plant Design for Tsunami height of up to 6.5m Actual Tsunami height >7m Flooding of Diesel Generators and/or Essential service water building cooling the generators Station Blackout Common cause failure of the power supply Only Batteries are still available Failure of all but one Emergency core cooling systems
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The Fukushima Daiichi Incident – March 21, 2011 The Fukushima Daiichi Incident 2. Accident progression Reactor Core Isolation Pump still available Steam from the Reactor drives a Turbine Steam gets condensed in the Wet-Well Turbine drives a Pump Water from the Wet-Well gets
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March21_JapanSeminar - March 21, 2011 The Nuclear Crisis in...

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