By Atomic Energy Society of Japan
The importance nine nice East Japan Earthquake on March eleven, 2011, through a big tsunami struck TEPCO’s Fukushima Daiichi Nuclear strength Station and brought on an unheard of middle melt/severe twist of fate in devices 1 – three. The radioactivity unlock resulted in the evacuation of neighborhood citizens, lots of whom nonetheless haven't been capable of go back to their homes.
As a gaggle of nuclear specialists, the Atomic power Society of Japan confirmed the research Committee at the Nuclear twist of fate on the Fukushima Daiichi Nuclear strength Station, to enquire and research the coincidence from clinical and technical views for clarifying the underlying and basic explanations, and to make ideas. the result of the research via 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 means of an exceptional gigantic earthquake/ tsunami – inadequacies in tsunami measures, critical coincidence administration, emergency reaction, twist of fate restoration and mitigations – and the underlying components - organizational matters, etc., were clarified and suggestions within the following components were made.
- Nuclear defense fundamentals
- Direct elements of the accident
- Organizational aspects
- universal goods (R&D, foreign cooperation, human assets management)
- Post-accident management/recovery from the accident.
Read or Download The Fukushima Daiichi Nuclear Accident: Final Report of the AESJ Investigation Committee PDF
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Additional info for The Fukushima Daiichi Nuclear Accident: Final Report of the AESJ Investigation Committee
The dose was higher on the outlet (Unit 3) side (Fig. 17), which supported the reverse flow from Unit 3. The site investigation on the fourth and fifth floors of the reactor building proved that while the fifth floor surface was deformed upward, the fourth floor surface was deformed downward, and that the air-conditioning duct on the fourth floor was no longer in the original place; reduced to rubble and scattered on the floor. Under these circumstances, it seems the hydrogen explosion occurred in the air-conditioning duct on the fourth floor and propagated to the whole building via the staircase.
Though the water temperature temporarily rose to around 70 C, the introduction of alternative cooling equipment maintained stable cooling. The SFP water sampling results at Units 1–3 showed that although seven months or more had elapsed since the shutdown of nuclear reactors, as short half-life nuclides were detected at the initial accident stage, and the nuclide composition resembled that of the stagnant water in the turbine building, it was assumed that SFP water was polluted by the damaged nuclear reactors.
Units 2–3 have BWR-5, basically the same as Unit 6 at the Fukushima Daiichi (see Sect. 1). 3 The Tokai Daini Nuclear Power Station The Tokai Daini Power Station (hereinafter the “Tokai Daini”) of the Japan Atomic Power Company (hereinafter the “Japan Atomic Power”) is located in Tokai village, Ibaraki prefecture. 1 million kW and started operation in 1978. The safety system configuration is BWR-5; basically the same as Unit 6 at Fukushima Daiichi (see Sect. 1). Chapter 3 Overview of the Accident at the Fukushima Daiichi Nuclear Power Station Abstract In the accidents of Fukushima Daiichi NPS, the core meltdown has resulted from severe accident at Unit 1–3, and the explosion of reactor building has occurred at Unit 4 which was during the periodic inspection, resulting in the substantial release of radioactive materials.