By Atomic Energy Society of Japan
The importance nine nice East Japan Earthquake on March eleven, 2011, by way of a big tsunami struck TEPCO’s Fukushima Daiichi Nuclear strength Station and caused an extraordinary middle melt/severe coincidence in devices 1 – three. The radioactivity unlock ended in the evacuation of neighborhood citizens, a lot of whom nonetheless haven't been capable of go back to their homes.
As a gaggle of nuclear specialists, the Atomic strength Society of Japan verified the research Committee at the Nuclear coincidence on the Fukushima Daiichi Nuclear energy Station, to enquire and research the coincidence from clinical and technical views for clarifying the underlying and primary motives, and to make innovations. the result of the research by way of the AESJ research Committee has been compiled herewith because the ultimate Report.
Direct contributing components of the catastrophic nuclear incident at Fukushima Daiichi NPP initiated through an exceptional titanic earthquake/ tsunami – inadequacies in tsunami measures, critical coincidence administration, emergency reaction, twist of fate restoration and mitigations – and the underlying elements - organizational matters, etc., were clarified and suggestions within the following parts were made.
- Nuclear defense fundamentals
- Direct components of the accident
- Organizational aspects
- universal goods (R&D, foreign cooperation, human assets management)
- Post-accident management/recovery from the accident.
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Extra info for The Fukushima Daiichi Nuclear Accident: Final Report of the AESJ Investigation Committee
In that case, it was likely that the two internal isolation valves were also closed and it was assumed that the IC would not function with the external isolation valves open. Later, the operators closed one of the IC external isolation valves at 18:25 amid concern over the decreasing water level on the body side the condenser but re-opened it again at about 21:30. Such series of operations, however, were not communicated to the Nuclear Emergency Response Headquarters, and those at the Fukushima Daiichi and TEPCO head office believed that the IC was operating normally.
It is also assumed that consequently, the molten core concrete interaction (MCCI) was suppressed and the molten fuel remained at about 70 cm in the pedestal floor which was eroded (Fig. 4). The containment vessel vent was planned concurring with the injection. As supplies of AC power and compressed air were lost, two valves had to be manually opened on site (Fig. 5). The MO valve on the second floor of the reactor building could be manually opened, but to open the AO valve, access to the basement torus room was required.
If the water level exceeds the nozzle position, two-phase flow came out of the main steam system and drove the RCIC turbine. It is assumed that for the RCIC, the operational condition was inefficient, whereby the water-injection flow was smaller than the rated value, and the discharge of the two-phase flow was balanced with the water injection by the RCIC. Conversely, from the nuclear power reactor, the two-phase flow, which had a larger enthalpy per unit volume, flowed out from the main steam pipe.
The Fukushima Daiichi Nuclear Accident: Final Report of the AESJ Investigation Committee by Atomic Energy Society of Japan