Wednesday, March 16, 2011

Japan's Nuclear Meltdown

Plant workers at Fukushima Daiichi are struggling to cool the three reactors and the fuel held in pools for spent fuel also held on site. Because of explosions caused by the build-up of hydrogen, it is believed that two of the containment structures that hold the reactors have been breached, greatly increasing risk of a release of large amount or radioactive material.
Although it's still an unstable situation, it's clear the damage at the Fukushima Daiichi plant is worse than the Three Mile Island accident in 1979 and will be studied for years to come. Based on comments from experts and published reports, this FAQ attempts to shed some light on the current situation, with an emphasis on understanding the health implications from radiation.
What is the latest on the attempts to cool the reactors?
Plant workers are using the improvised technique of pumping seawater with added boron (which slows down nuclear fission) into the reactors at Fukushima Daiichi. As of Thursday in Japan, officials said that a hydrogen explosion has occurred in a second building which contains the hot nuclear reactor core. The containment vessel, in which the reactor is held, may have been breached at both the number two and number three reactors, according to a New York Times report today. The explosions that have occurred are likely hydrogen explosions when hydrogen from the water mixes with the metal cladding over the uranium rods.


Read more: http://news.cnet.com/8301-11128_3-20043865-54.html#ixzz1GmnsZbya

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