By Atomic Energy Society of Japan

The value nine nice East Japan Earthquake on March eleven, 2011, by way of an incredible tsunami struck TEPCO’s Fukushima Daiichi Nuclear strength Station and caused an remarkable center melt/severe twist of fate in devices 1 – three. The radioactivity free up ended in the evacuation of neighborhood citizens, a lot of whom nonetheless haven't been in a position to go back to their homes.

As a bunch of nuclear specialists, the Atomic power Society of Japan proven the research Committee at the Nuclear twist of fate on the Fukushima Daiichi Nuclear strength Station, to enquire and learn the coincidence from medical and technical views for clarifying the underlying and primary factors, and to make thoughts. the result of the research by means of the AESJ research Committee has been compiled herewith because the ultimate Report.

Direct contributing elements of the catastrophic nuclear incident at Fukushima Daiichi NPP initiated by way of an extraordinary vast earthquake/ tsunami – inadequacies in tsunami measures, critical coincidence administration, emergency reaction, twist of fate restoration and mitigations – and the underlying components - organizational concerns, etc., were clarified and suggestions within the following components were made.

- Nuclear protection fundamentals

- Direct elements of the accident

- Organizational aspects

- universal goods (R&D, overseas cooperation, human assets management)

- Post-accident management/recovery from the accident.

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The Fukushima Daiichi Nuclear Accident: Final Report of the AESJ Investigation Committee

The value nine nice East Japan Earthquake on March eleven, 2011, via an enormous tsunami struck TEPCO’s Fukushima Daiichi Nuclear energy Station and prompted an remarkable middle melt/severe twist of fate in devices 1 – three. The radioactivity free up ended in the evacuation of neighborhood citizens, lots of whom nonetheless haven't been in a position to go back to their houses.

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Extra info for The Fukushima Daiichi Nuclear Accident: Final Report of the AESJ Investigation Committee

Example text

Conversely, the reactor pressure was low around 6 MPa [gage] though the SRV relief valve function did not work (Fig. 8). It is assumed from subsequent TEPCO’s analysis that although the loss of DC 28 3 Overview of the Accident at the Fukushima Daiichi Nuclear Power Station RCIC manual start-up Deterioration in RCIC function (assumed) Open SRV Actual measurement value (Fuel Area A) Water level in the shroud (analysis) Downcomer water level (analysis) Amended water level Reactor water level (m) Amended water level Reached TAF About 17:00 on March 14 Measured value (Fuel Area A) Reached BAF About 18:10 on March 14 Water level in the shroud (analytical value) Started injecting seawater Downcomer water level (analytical value) Day/time Fig.

1 Layout of the Fukushima Daini and the tsunami After the occurrence of the earthquake, at around 15:30, the tsunami attacked the Fukushima Daini. P. ) + 4 m (Fig. 1). P. + 12 m along the road from the sea to the Seismic Isolation Building, southeast of the main building site area and proceeded in the direction from Units 1–4, which meant the inundation was deep on the south side of Unit 1, and near the Seismic Isolation Building in particular, reached about 15 m. Conversely, the inundation around Units 2 and 3 was shallower, despite water ingress from Unit 1.

The Fukushima Daiichi station suffered widespread flooding due to the tsunami, while many seawater cooling devices were also damaged. The buildings were inundated and most of the functions of power panels at units were lost. Likewise, all AC power was cut to Units 1–5, while Units 1, 2, and 4 also lost DC power supplies. Fukushima Daiichi devised countermeasures for the station blackout (SBO): reactor cooling through the isolation condenser (IC), which requires DC power, the reactor core isolation cooling system (RCIC system), and the high pressure coolant injection system (HPCI system) and the interchange of high-voltage power from adjacent units.

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