By Michio Ishikawa
Written via a professional within the box, this e-book is ideal if you happen to want to comprehend what occurred on the Fukushima Daiichi Nuclear strength Plant. half 1 of the ebook experiences how center melts happened in Fukushima Daiichi devices 1, 2, and three, respectively, according to proof from the Three-Mile Island center soften twist of fate and gas habit experiments played within the Seventies below the cooperation among the us, Germany, and Japan. this knowledge explains the coincidence techniques with out contradicting facts from Fukushima, which used to be released within the TEPCO record. The hydrogen explosions in devices 1, three, and four also are defined logically at the side of the above middle soften method. half 2 clarifies how the historical past radiation point of the positioning doubled: the 1st upward push was once only a leak from small openings in devices 1 and three linked to fire-pump connection paintings. the second one upward thrust ended 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 strength crops to extend safety opposed to normal failures can be mentioned. New proposals for defense layout and emergency preparedness are recommended in line with classes realized from the coincidence in addition to from new studies. ultimately, an idea for decommissioning the Fukushima web site and a restoration plan are introduced.
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Extra resources for A Study of the Fukushima Daiichi Nuclear Accident Process: What caused the core melt and hydrogen explosion?
5 Phase diagram of cladding tube temperature and fuel rod 20 1 Three Mile Island Nuclear Power Station Accident a very minute heat generation that could barely increase the fuel rod temperature by 1 °C per second, please assume that the temperature of the fuel pellets was approximately equal to that of the cladding tubes. Now let me move on to the explanation of the drawing. [I] The state of fuel rod with the cladding tube temperature of 400 °C is the status of 100 min after the start of the TMI accident.
7. At around 174 min, an abrupt pressure rise was detected. 5 MPa within a span of approximately 2 min. That is a very steep increase in pressure. This kind of pressure increase could only be the result of hydrogen gas generation due to a metal-water reaction. 5 MPa in 2 min. Let us estimate the total volume of the primary cooling system of the TMI reactor to be approximately 300 m3, and assume that it contained 100 m3 of saturated steam and 200 m3 of saturated water. 2]. In case of the TMI accident, it is calculated that a total of approximately 400 kg of hydrogen gas was generated.
Safety review criteria are based on the results of the analyses of the Design Basis Accident (DBA). This is a common rule worldwide. This particular setting is based on the finding of the oxidation reaction of cladding tubes that I mentioned above. The value of 1,200 °C was 18 1 Three Mile Island Nuclear Power Station Accident arrived at by subtracting a safety margin of 100 °C from 1,300 °C, and the purpose is to prevent a core melt that might be caused by the unstoppable oxidation reactions of cladding tubes.