By Michio Ishikawa
Written by way of knowledgeable within the box, this publication is ideal if you want to understand what occurred on the Fukushima Daiichi Nuclear strength Plant. half 1 of the e-book experiences how center melts happened in Fukushima Daiichi devices 1, 2, and three, respectively, according to proof from the Three-Mile Island middle soften twist of fate and gasoline habit experiments played within the Nineteen Seventies less than the cooperation among the U.S., Germany, and Japan. this knowledge explains the coincidence tactics with out contradicting info from Fukushima, which used to be released within the TEPCO document. The hydrogen explosions in devices 1, three, and four also are defined logically together with the above center soften strategy. half 2 clarifies how the history radiation point of the location doubled: the 1st upward thrust used to be only a leak from small openings in devices 1 and three linked to fire-pump connection paintings. the second one upward thrust resulted in direct radioactive fabric unencumber from unit 2. Evacuation dose adequacy and its timing are mentioned just about the twist of fate procedure, and the need for embankments surrounding nuclear energy crops to extend safeguard opposed to traditional failures can be mentioned. New proposals for security layout and emergency preparedness are recommended according to classes realized from the coincidence in addition to from new studies. eventually, an idea for decommissioning the Fukushima web site and a restoration plan are introduced.
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Additional resources for A Study of the Fukushima Daiichi Nuclear Accident Process: What caused the core melt and hydrogen explosion?
Because the TMI core, which once melted was cooled within ten several hours after the accident, it was fossilized at the stage before it reached a complete melt to show us today how it was formed. The TMI accident was essentially over when the reactor coolant pump was started 16 h later. The rest of the time was spent purging out the hydrogen remaining in the primary coolant and keeping the system cool by feeding water to the steam generator and the natural circulation of the primary system. That is the end of the story of the core melt and solidification of the TMI accident.
The fuel rod that withstood the intense heat broke down as soon as their temperatures dropped when the reactor operation was stopped. ” It was a strange way of breaking. When the test loop was opened, they found blackened and disintegrated pieces of fuel rods (see Fig. 4) laying over each other. The fuel pellets covered by blackened skin appeared to have various sizes and shapes of breaks and cracks, but they also seemed to have generally retained their original shapes. Although it was estimated by calculation that the inside of the pellets was in a molten state, it was reported that they saw no trace of the overlaid pellets welding together, in fact, there were some gaps formed between them for water to flow through.
The broken down fuel pellets did not melt together, nor did they turn into agglomerates. They were overlaid on each other as if they were parts of a collapsed woodblock work, but there were spaces between them for the coolant to flow through. The fuel rod was broken down into pieces because of the characteristics of oxides that become brittle when they get cold. The oxide film that was strong at high temperatures turned brittle as they got cooler due to the stoppage of the reactor. The oxide film that became brittle caused cracks as it shrank along with the temperature reduction.
A Study of the Fukushima Daiichi Nuclear Accident Process: What caused the core melt and hydrogen explosion? by Michio Ishikawa