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Shunichi Yama#a, professor of biomedical sciences at Nagasaki University.
"Just as we have become attuned to pesticide risk, we will have to learn to live with radiation risk and do what we can to avoid contaminated food and water."
Health risk from troubled Japan nuclear plant
By Mayumi Negishi and Tan Ee Lyn Mayumi Negishi And Tan Ee Lyn – Fri May 6, 2:23 pm ET
TOKYO (Reuters) – Radioactive substances have been leaking from Japan's tsunami-damaged Fukushima Daiichi nuclear plant for nearly two months, and the plant is likely to continue emitting radiation into the atmosphere, and possibly into the ocean and ground water, for many months to come. news.yahoo.com...
Originally posted by whoswho69
reply to post by JustMike
NHK World - The video was taken on Saturday by a camera on the tip of a mechanical arm used to pour water to cool the reactor.
After analyzing the amount of radioactive materials in the water, Tokyo Electric Power Company has concluded that the spent fuel rods are not seriously damaged.
Tokyo Electric Power Company (TEPCO), Nuclear and Industrial Safety Agency (NISA), and the Japanese government gave a joint press conference on Sunday and explained that an unusual amount of smoke that billowed from the Fukushima Daiichi nuclear power reactor on Saturday night was nothing to be concerned about.
"Steam is coming out from the spent fuel pool of the No. 3 and No. 4 reactors, and I'm assuming that due to shadows created by lighting, the steam appeared black. Therefore, we assessed that it's not smoke from something burning or that sort of thing," TEPCO's General Manager, Junichi Matsumoto reassured reporters at the press conference.
Kyodo News Agency reported that the temperature of No. 3 reactor rose from 163 degrees Celsius to 202 degrees Celsius on Saturday, although this is still lower than the normal operating temperature of 286 degrees Celsius. This has possibly caused the more than usual amount of steam coming out from the nuclear reactors.
Originally posted by mrbillshow
reply to post by Wertwog
More importantly, Gunderson reaffirms his opinion the explosion in #3 was from the fuel pool and offers additional support why it wasn't the RPV or PCV, the same reasons I gave last week when I was attacked for my position. His groundwater and ocean contamination theories are the same as mine that I put forth weeks ago. which got fewer stars than the kitty litter theory.
Thanks Arne, you da man.
The attached plot indicates that the temperatures at the upper portion of RPV are increasing significantly than the temperature at the lower portion of the RPV. The 200 degree-C in temperature corresponds to a super saturated steam at this pressure, although the estimated pressure is not so much different from the atmospheric pressure. Unfortunately pressure gauge as well as level gage is acting funny and is not dependable. There are two possibilities to explain these situations:
(1) There is not enough cooling flow available through a debris, potentially piled on top of the core support plate. The insufficient coolant flow resulted in high temperature steam release, which seems to be heating up the upper portion of the reactor vessel; or
(2) Most of the fuel bundles are still maintaining a self-standing configuration, however, with the low water level, the boiling steam is overheated at the top portion of the fuel rods. I stand on the case (1), since the Feedwater Nozzle temperatures of both 1F2 and 1F3 are gradually decreasing towards the boiling point of water and are well-behaving. They are reasonably responding to changes in flow rate of water injection. Only in 1F3, the temperature is responding wildly.
Since May 4, TEPCO increased the water flow rate to 9 tons per hour, increased from the previous 7 tons per hour. In spite of this flow increase, the temperature is still increasing. TEPCO is intensively monitoring the development of this situation. It is an growing concern whether this is a reversible operation or not. It can be an indication of a spontaneous aggregation of the temperature surge beyond control.