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- W4384785149 abstract "Regarding the root cause analysis of reactor core melt accidents at the TEPCO Fukushima Daiichi nuclear power plant, the author has already published a paper 1) on a new approach based on his original viewpoints. In this current study, he verified the new approach called the “film boiling approach” as shown below. On the basis of this approach, film boiling (with steam) continued until the amount of decay heat decreased one or two weeks after initiating dry out or Zr-H2O reactions in the core. Subsequently, the bottom wall of the reactor pressure vessel (RPV) melted and the melted core dropped (melt-through) into the containment vessel. On the other hand, on the basis of the conventional approach, melt-through occurred for a short time after the core melted. That is, using the film boiling approach, melt-through was predicted to occur on 24 March for Unit 1 and 21 March for Unit 3, but it occurred on 12 March for Unit 1 and 14 March for Unit 3 in accordance with the conventional approach. Recently, it has been found by a robot camera in the containment vessel of Unit 1 that concrete disappeared and naked rebars appeared in the wall around the open area of the pedestal under the RPV. From this finding, the test data of “the heated concrete was washed away with water” was verified by that in the core of Unit 1; that is, there was much water on 24 March, although there was no water on 12 March. Moreover, it has been found that the radioactivity level of debris broken into pieces by hydrogen explosion is very low around the turbine building but is very high in the reactor building (RB) in Units 1 and 3. From this finding, the level around the RB was verified to be low as melt-trough had not yet occurred at the moment of the explosion (12 March in Unit 1 and 14 March in Unit 3), but the debris in the RB was subsequently activated by radio activities after melt-through." @default.
- W4384785149 created "2023-07-20" @default.
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- W4384785149 date "2023-01-01" @default.
- W4384785149 modified "2023-10-18" @default.
- W4384785149 title "東電福島炉心溶融事故進展解明（一考察）の検証" @default.
- W4384785149 cites W3017000731 @default.
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- W4384785149 doi "https://doi.org/10.3327/taesj.j22.014" @default.
- W4384785149 hasPublicationYear "2023" @default.
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