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U.S. Sees Array of New Threats at Japanís Nuclear Plant

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wtmusic Donating Member (1000+ posts) Send PM | Profile | Ignore Thu Apr-07-11 06:43 PM
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U.S. Sees Array of New Threats at Japanís Nuclear Plant
"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. "

http://www.nytimes.com/2011/04/06/world/asia/06nuclear....



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kristopher Donating Member (1000+ posts) Send PM | Profile | Ignore Thu Apr-07-11 06:55 PM
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