By Michio Ishikawa
Written by means of knowledgeable within the box, this booklet is ideal if you happen to want to understand what occurred on the Fukushima Daiichi Nuclear energy Plant. half 1 of the booklet reviews how middle melts happened in Fukushima Daiichi devices 1, 2, and three, respectively, in keeping with facts from the Three-Mile Island middle soften coincidence and gasoline habit experiments played within the Nineteen Seventies below the cooperation among the USA, Germany, and Japan. this knowledge explains the coincidence approaches 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 along with the above middle soften method. half 2 clarifies how the history radiation point of the positioning doubled: the 1st upward push used to be only a leak from small openings in devices 1 and three linked to fire-pump connection paintings. the second one upward push ended in direct radioactive fabric unlock from unit 2. Evacuation dose adequacy and its timing are mentioned near to the coincidence strategy, and the need for embankments surrounding nuclear strength vegetation to extend safeguard opposed to usual mess ups is additionally mentioned. New proposals for defense layout and emergency preparedness are prompt in keeping with 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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Extra resources for A Study of the Fukushima Daiichi Nuclear Accident Process: What caused the core melt and hydrogen explosion?
Obviously they were not too confident of what they were doing. ” I am sure they were scared to turn on the switch. They must have done it so very tentatively. It was because they had to stop the pump due to the terrible cavitation vibration, and then when they turned it on again, the reactor pressure rose sharply with a violent change of neutron flux. However, this very tentative switching on ended up, a big success. As the big pump began to run, the core temperature started to drop sharply. The circulation of the primary coolant was achieved when the pump began to run.
1), made contact with the baffle plate made of a thin stainless steel piece surrounding the reactor, and made holes in the baffle plate by melting a part of it. It is said that about a half of the molten core was pushed out through this melted hole, and moved to the bottom spherical part of the pressure vessel. 1 Three Mile Island Nuclear Power Station Accident 24 (MPa) Block valve open Closed Block valve of pressurizer relief valve open Reactor pressure 15 4 Site emergency declared 3 10 Collapse of core upper portion Closed 5 Operate Operate 6 Stop High pressure 7 2 Block valve open injection system operated Core relocation 1 5 Reactor coolant pump operated Stop Stop Operate 0 100 200 Elapsed time (minute) Fig.
The most interesting is the existence of the debris remaining on the molten core. After the fuel rods that used to stand straight up collapsed when they were exposed to cooling water, the debris was cooled on the shell of the molten core. Instead of being rolled up inside the molten core, the debris stayed outside of it maintaining its shape. Without the existence of the debris, we cannot prove the relation between the PCM-1 test and the TMI accident. We would have never been able to explain the mechanism of the core melt as well.
A Study of the Fukushima Daiichi Nuclear Accident Process: What caused the core melt and hydrogen explosion? by Michio Ishikawa