[...] Unimaginable “terrible reality”, but might be going on deep inside the reactor building basement —.
International Atomic Energy Agency released on July 6 (IAEA) report to the government in Unit 1 to 3 “through” molten acknowledged that possibility. This is the core melt (melt down), the nuclear fuel, penetrate the reactor pressure vessel, they pouring outside containment to further “melt-through” but that the state (see right).
But “at the Fukushima Daiichi more desperate situation,” you said, is Assistant Professor Hiroaki Koide of Kyoto University Reactor.
“The melt-lump of uranium is the fuel melted, defeating even the bottom of the containment, and I believe that it is not at that Meri込N on the ground melted the concrete beneath the reactor building. Part of the core of nuclear fuel soluble exceed the 2800 ℃ (can not be measured because the current temperature of the high radiation dose.) weight of the melt is also 100t. steel pressure vessel and containment would melt at about 1500 ℃ from the melt should have fallen on the floor of the reactor building basement. some of which eroded the floor of the basement, some would have melted the contaminated water to flow to the surrounding walls”
こ れ は fuel ga nuclear reactor building の external に direct leakage れ out て, Zhou 囲 に high concentration の radioactive を spread ki scattered ら す “メ Hikaru Suites ア ウ Suites” と call ば れ ru most 悪 の state da. Koide’s が 続 け ru.
“If you hit the groundwater melt, then spread of radioactive material be cooled circulating some will not prevent you can not. As long as stopping the flow of groundwater, the sea around is to continue being contaminated. To prevent pollution Gutameniha, Shikanai would make the sides of the shield wall of the reactor building basement. The contaminated soil and the melt is cut off contact with groundwater, ”
Also look to the structure of a nuclear reactor melt-out potential is happening is high. The explanation is that, it was a design engineer who Masashi Goto containment vessel Toshiba original.
“The thickness of the steel pressure vessel also has a few cm enough. The thickness of the containment, while only 20 ~ 30mm. Pressure vessel also is has been designed to withstand the pressure 70 stores The pressure vessel is set 4. you get enough fuel to leak if the pressure vessel melt, containment not stand a chance. including the reactor building basement concrete wall covered let alone a mere super-hot melt is not to avoid.
Containment pressure vessel can be the first place, not being done on the assumption that the core melt. Design has already been compromised. Any action be taken to melt down, so penetrate the containment vessel pressure from the melt of the floor would melt out of the reactor building basement is a matter of time ”
Radioactive material scattered by melt-out, and something more deadly. Some of the contaminated water which overflowed from the underground to the surface, such as iodine and cesium in two years in 08 half-life of radioactive material containing a lot of light at the top of the water reservoir and easy. The leaking from underground, however, it becomes radioactive material such as plutonium, strontium and 40,000,002 for the year of the half-life of 29 years. Plutonium, in particular, continues to destroy the internal organs into humans over 50 years, “radioactive material” worst called. Institute of Applied professor at Chubu University, said Mr. Kunihiko Takeda yuan Cabinet Chair Atomic Energy Commission.
TEPCO, what are considered to be in the current situation and how the molten nuclear fuel. TEPCO has acknowledged that the meltdown, the answer was not persuasive.
“Analysis is now evaluated as a fall in the bottom of the pressure vessel to melt the fuel No. 1. Has now been cooled to a stable priming situation leads to the release of radioactive material for large future happen I think not. No. 2, No. 3 well, moving forward with a similar analysis. For specific conditions in the reactor is not known. in that hole in the containment has pointed out that for Also, we will report on current research while promoting “(Public Relations Department)
In short, nuclear fuel is “being cool” stable but every claim to melt through, the possibility of melt-out, not knowing any more details “under investigation,” he say. TEPCO Moreover, while answering it, is considering the construction of the shield wall extending deep underground beneath the reactor building.
“We have started to design. To shield contaminated groundwater, and we are planning to build” (ibid).
As mentioned earlier, Koide said, “to prevent the outflow of the groundwater hit the nuclear fuel only to make a shield wall” has been warned. Mentioned in his mouth trying for the worst might be happening but are not aware of the possibility of TEPCO will melt out in motion measures that have begun or not. Fukushima Daiichi nuclear power plant works in reveals that one of the employees of subcontractors. [...]
Published: July 9th, 2011 at 5:27 pm ET