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U.S. Sees Array of New Threats at Japan's Nuclear Plant

World  (tags: Alerts, Earth Quake in Japan, Nuclear Energy, tsumani )

- 2996 days ago -
The document also cites the possibility of explosions inside the containment structures due to the release of hydrogen and oxygen from seawater pumped into the reactors, and offers new details on how semimolten fuel rods and salt buildup are impeding-->


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Kit B (276)
Wednesday April 6, 2011, 5:34 pm
United States government engineers sent to help with the crisis in Japan are warning that the troubled nuclear plant there is facing a wide array of fresh threats that could persist indefinitely, and that in some cases are expected to increase as a result of the very measures being taken to keep the plant stable, according to a confidential assessment prepared by the Nuclear Regulatory Commission.

Among the new threats that were cited in the assessment, dated March 26, are the mounting stresses placed on the containment structures as they fill with radioactive cooling water, making them more vulnerable to rupture in one of the aftershocks rattling the site after the earthquake and tsunami of March 11. The document also cites the possibility of explosions inside the containment structures due to the release of hydrogen and oxygen from seawater pumped into the reactors, and offers new details on how semimolten fuel rods and salt buildup are impeding the flow of fresh water meant to cool the nuclear cores.

In recent days, workers have grappled with several side effects of the emergency measures taken to keep nuclear fuel at the plant from overheating, including leaks of radioactive water at the site and radiation burns to workers who step into the water. The assessment, as well as interviews with officials familiar with it, points to a new panoply of complex challenges that water creates for the safety of workers and the recovery and long-term stability of the reactors.

While the assessment does not speculate on the likelihood of new explosions or damage from an aftershock, either could lead to a breach of the containment structures in one or more of the crippled reactors, the last barriers that prevent a much more serious release of radiation from the nuclear core. If the fuel continues to heat and melt because of ineffective cooling, some nuclear experts say, that could also leave a radioactive mass that could stay molten for an extended period.

The document, which was obtained by The New York Times, provides a more detailed technical assessment than Japanese officials have provided of the conundrum facing the Japanese as they struggle to prevent more fuel from melting at the Fukushima Daiichi plant. But it appears to rely largely on data shared with American experts by the Japanese.

Among other problems, the document raises new questions about whether pouring water on nuclear fuel in the absence of functioning cooling systems can be sustained indefinitely. Experts have said the Japanese need to continue to keep the fuel cool for many months until the plant can be stabilized, but there is growing awareness that the risks of pumping water on the fuel present a whole new category of challenges that the nuclear industry is only beginning to comprehend.

The document also suggests that fragments or particles of nuclear fuel from spent fuel pools above the reactors were blown “up to one mile from the units,” and that pieces of highly radioactive material fell between two units and had to be “bulldozed over,” presumably to protect workers at the site. The ejection of nuclear material, which may have occurred during one of the earlier hydrogen explosions, may indicate more extensive damage to the extremely radioactive pools than previously disclosed.

David A. Lochbaum, a nuclear engineer who worked on the kinds of General Electric reactors used in Japan and now directs the nuclear safety project at the Union of Concerned Scientists, said that the welter of problems revealed in the document at three separate reactors made a successful outcome even more uncertain.

“I thought they were, not out of the woods, but at least at the edge of the woods,” said Mr. Lochbaum, who was not involved in preparing the document. “This paints a very different picture, and suggests that things are a lot worse. They could still have more damage in a big way if some of these things don’t work out for them.”

The steps recommended by the nuclear commission include injecting nitrogen, an inert gas, into the containment structures in an attempt to purge them of hydrogen and oxygen, which could combine to produce explosions. On Wednesday, the Tokyo Electric Power Company, which owns the plant, said it was preparing to take such a step and to inject nitrogen into one of the reactor containment vessels.

The document also recommends that engineers continue adding boron to cooling water to help prevent the cores from restarting the nuclear reaction, a process known as criticality.

Even so, the engineers who prepared the document do not believe that a resumption of criticality is an immediate likelihood, Neil Wilmshurst, vice president of the nuclear sector at the Electric Power Research Institute, said when contacted about the document. “I have seen no data to suggest that there is criticality ongoing,” said Mr. Wilmshurst, who was involved in the assessment.

The document was prepared for the commission’s Reactor Safety Team, which is assisting the Japanese government and the Tokyo Electric Power Company. It says it is based on the “most recent available data” from numerous Japanese and American organizations, including the electric power company, the Japan Atomic Industrial Forum, the United States Department of Energy, General Electric and the Electric Power Research Institute, an independent, nonprofit group.

Page 1 of 2 - and there are some interesting photos and graphic images- please go to |Visit Site|

By JAMES GLANZ and WILLIAM J. BROAD for The New York Times

Kathy Javens (104)
Thursday April 7, 2011, 7:30 am
Noted. I watch the updates every day on the news, and it gets more frightening every day. How and when will this all be resolved, if ever?

patricia lasek (317)
Thursday April 7, 2011, 8:17 am
I submitted a news story with a petition to close Indian Pint reactor in NY. If you have the inclination please note and sign it.

Sorry for putting this on your story Miss Kitty. I thought it was important.

Dave Colorado (11)
Thursday April 7, 2011, 12:02 pm
So if the NYTimes is so f'ing smart and illuminating, how come they are unable(/unwilling) to consider ANY of the hijacker-exculpatory 9/11 evidence, or ANY of the evidence which reveals that ""Ground Zero"" was a working demonstration of a new energy paradigm -- clean/fissionless nuclear fusion -- one which has the potential of solving virtually all of our world's energy, economic, AND ecological concerns???

Agent Kit (self-outed; see 3:18 pm...), how come you persistently consistently link to all the best gatekeepers?

Hartson Doak (39)
Thursday April 7, 2011, 3:51 pm
After this I would hope that the Japanese and everyone else will shut down the nukes and go alternative. Japan has massive ocean currents, wind and geothermal resources.

Kit B (276)
Thursday April 7, 2011, 4:10 pm

Yes, Hartson they do, so far the Oil and Gas industry keeps a tight hold on all forms power, except the solar and wind. Until we either do it for ourselves or demand the government do it in our name things will not change.

Barbara Erdman (63)
Thursday April 7, 2011, 9:18 pm
Noted and thanx Kitty :-0

Past Member (0)
Friday April 8, 2011, 6:32 am
"Japan has massive ocean currents, wind and geothermal resources."

Of the three you mentioned, geothermal is the only one that doesn't cause environmental damage. Wind turbines kill hundreds of thousands of bats and birds every year. Tidal power can cause significant damage to aquatic ecosystems.

Nelson Baker (0)
Friday April 8, 2011, 7:38 am
The Japanese are supposed to be so intelligent. Before they built the plant why did they not know it was a dangers location and why was the plant not built with many safeguards?

Kit B (276)
Friday April 8, 2011, 7:41 am

Americans claim intellect as well, yet are building a plant by the same people (GE) on the Texas coast. Coast lines are always a dangerous place, any fool knows that.

Rosie Lopez (73)
Friday April 8, 2011, 11:24 am
thanks for sharing

Laura N (7)
Monday April 11, 2011, 11:47 am
Noted, I keep an eye on the news on this specific topic to see how it developes further since I do support the usage of nuclear energy but a surveyed one. And to see which impact will it have within the Japanese society and later on worldwide.

Hope Sellers (25)
Monday April 11, 2011, 7:42 pm
I haven't been able to get any up-to-date news on this situation. I think this is more danerous to the world than they are telling us.
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