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[Let us start with the scientific and engineering basis of the severe accident analysis carried out before the Fukushima nuclear accident. In particular, the accident of the Three Mile Island Nuclear Power Station (TMI) had given a comprehensive view when the severe accident took place due to a small break loss of coolant accident. In addition, it provided us important knowledge on the core melt from the destructive examinations undertaken by the international collaboration. How the core melt took place and how such a huge amount of energy came from could be understood with the help of research work on the behavior of the fuel carried out by the international collaboration in the 1970s. I led these studies including fuel destructive tests by the NSSR that clarified how the Zircaloy cladded fuel of the LWR chemically interact with water and generate intense energy to cause core melt and associated hydrogen. These experimental evidences provided the basis of a scenario of the TMI and Fukushima accidents.]
Published: Apr 7, 2015
Keywords: TMI; Fukushima Daiichi; NSSR; Zircaloy; LWR; Core melt; PCM-1; PBF; Hydrogen explosion; Decay heat; Oxidation
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