福島核電站泄露過(guò)程揭秘(完整版)
【正文】 2022 The Fukushima Daiichi Incident 2. Accident progression at ~1800176。C [Unit 1,2,3] ? Melting of the Cladding ? Melting of the steel structures at ~2500176。C [Block 1] ? Melting of UraniumZirconium eutectics Restoration of the water supply stops accident in all 3 Units ? Unit 1: . 20:20 (27h . water) ? Unit 2: . 20:33 (7h . water) ? Unit 3: . 9:38 (7h . water) The Fukushima Daiichi Incident – Dr. Matthias Braun 28 May 2022 The Fukushima Daiichi Incident 2. Accident progression Release of fission products during melt down ? Xenon, Cesium, Iodine,… ? Uranium/Plutonium remain in core ? Fission products condensate to airborne Aerosols Discharge through valves into water of the condensation chamber ? Pool scrubbing binds a fraction of Aerosols in the water Xenon and remaining aerosols enter the DryWell ? Deposition of aerosols on surfaces further decontaminates air The Fukushima Daiichi Incident – Dr. Matthias Braun 28 May 2022 The Fukushima Daiichi Incident 2. Accident progression Containment ? Last barrier between Fission Products and Environment ? Wall thickness ~3cm ? Design Pressure 45bar Actual pressure up to 8 bars ? Normal inert gas filling (Nitrogen) ? Hydrogen from core oxidation ? Boiling condensation chamber (like a pressure cooker) Depressurization of the containment ? Unit 1: . 4:00 ? Unit 2: 00:00 ? Unit 3: . The Fukushima Daiichi Incident – Dr. Matthias Braun 28 May 2022 The Fukushima Daiichi Incident 2. Accident progression Positive und negative Aspects of depressurizing the containment ? Removes Energy from the Reactor building (only way left) ? Reducing the pressure to ~4 bar ? Release of small amounts of Aerosols (Iodine, Cesium ~%) ? Release of all noble gases ? Release of Hydrogen Gas is released into the reactor service floor ? Hydrogen is flammable The Fukushima Daiichi Incident – Dr. Matthias Braun 28 May 2022 The Fukushima Daiichi Incident 2. Accident progression Unit 1 und 3 ? Hydrogen burn inside the reactor service floor ? Destruction of the steelframe roof ? Reinforced concrete reactor building seems undamaged ? Spectacular but minor safety relevant The Fukushima Daiichi Incident – Dr. Matthias Braun 28 May 2022 The Fukushima Daiichi Incident 2. Accident progression Unit 2 ? Hydrogen burn inside the reactor building ? Probably damage to the condensation chamber (highly contaminated water) ? Uncontrolled release of gas from the containment ? Release of fission products ? Temporal evacuation of the plant ? High local dose rates on the plant site due to wreckage hinder further recovery work No clear information39。C As there is no heat removal from the building, the Core isolation pump cant work infinitely The Fukushima Daiichi Incident – Dr. M
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