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Rising temperatures at Fukushima raise questions over stability of nuclear plant
Posted By admin On February 8, 2012 @ 4:57 am In World News | Comments Disabled
London Guardian 
February 8, 2012
Workers at the Fukushima Daiichi nuclear power plant say they are regaining control of a reactor after its temperature rose dramatically this week, casting doubt on government claims that the facility has been stabilised.
The plant’s operator, Tokyo Electric Power [Tepco] was forced to increase the amount of cooling water being injected into the No 2 reactor after its temperature soared to 73.3C earlier this week.
By Tuesday night, the temperature had dropped to 68.5C at the bottom of the reactor’s containment vessel, where molten fuel is believed to have accumulated after three of Fukushima Daiichi’s six reactors suffered meltdown after last year’s tsunami disaster.
The temperature at the bottom of the No 2 reactor vessel had risen by more than 20C in the space of several days, although it remained below the 93C limit the US nuclear regulatory commission sets for a safe state known as cold shutdown. Tepco said it had also injected water containing boric acid to prevent a nuclear chain reaction known as re-criticality.
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 London Guardian: http://www.guardian.co.uk/world/2012/feb/08/fukushima-rising-temperatures-stability-nuclear-reactor
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