By Michio Ishikawa
Written by way of a professional within the box, this publication is ideal if you wish to recognize what occurred on the Fukushima Daiichi Nuclear strength Plant. half 1 of the e-book reports how middle melts happened in Fukushima Daiichi devices 1, 2, and three, respectively, in keeping with facts from the Three-Mile Island center soften twist of fate and gas habit experiments played within the Seventies lower than the cooperation among the us, Germany, and Japan. this knowledge explains the twist of fate strategies with out contradicting info from Fukushima, which was once released within the TEPCO file. The hydrogen explosions in devices 1, three, and four also are defined logically along with the above center soften method. half 2 clarifies how the heritage radiation point of the positioning 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 unlock from unit 2. Evacuation dose adequacy and its timing are mentioned with regards to the coincidence procedure, and the need for embankments surrounding nuclear energy vegetation to extend safety opposed to normal mess ups can also be mentioned. New proposals for defense layout and emergency preparedness are steered in keeping with classes discovered 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?
The operating staff suspected that the natural circulation of the primary system was obstructed by the presence of steam bubbles, so that they tried to break the steam bubbles through pressurizing the primary system by means of closing the block valve of the pressurizer relief valve. Next, they tried to lower the reactor pressure to the operating pressure of the residual heat removal system by opening the block valve of the pressurizer relief valve, but that didn’t work either. Additional injection of high pressure water did not allow them to add much water either as hydrogen gas worked as a cushion.
8 Influences and Excursuses of the TMI Accident The TMI accident was essentially over within one day, but it was only in the third day after the first incident that it developed into such havoc as the evacuation of the residents. I will tell you now about several incidents that occurred during this period which might be of some interests to you. If you are in a hurry, you may wish to skip this section. , the melting point of uranium dioxide, which is the core fuel. Therefore, people believed in such a farce that a steel pressure vessel (melting point: approximately 1,400 °C) can easily melt and a concrete floor (melting point: approximately 1,600 °C) can also be easily melted due to the decay heat of the molten core that drops through a hole made in the pressure vessel by melting.
An accident ended up as the disaster because something that was never expected in the computer occurred, and it is natural that the computer can only spit out wrong answers no matter how much the inputs are fine tuned. It is necessary to think about the physical phenomenon that led to the accident by sorting out and analyzing the accident process based on the accident data before trying to solve the problem relying on computers. The core melt of Fukushima Daiichi was caused by the chemical reaction between water and zircaloy of the cladding tube that became hot same as in the case of the TMI accident.
A Study of the Fukushima Daiichi Nuclear Accident Process: What caused the core melt and hydrogen explosion? by Michio Ishikawa