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Japan:3 Fukushima reactors cooled below 100 degrees

Wednesday, September 28, 2011

Laaska News  Sept. 28,2011

The temperature of another troubled reactor at the Fukushima Daiichi nuclear power plant has fallen below 100 degrees Celsius for the first time since the nuclear disaster in March.

Tokyo Electric Power Company or TEPCO says the temperature in the lower area of the Number 2 reactor stood at 99.4 degrees at 5 PM on Wednesday.

Temperatures at the Number 1 and 3 reactors have been maintained below 100 degrees Celsius since August.

The utility says its cooling efforts have achieved results although it is too early to say that it has attained a state of cold shutdown for all 3 troubled reactors.

Cold shutdown is a state where temperatures below 100 Celsius are sustained and the situation remains stable.

The utility now says it is important to ensure a reliable cooling system to achieve cold shutdown.



Fukushima-1 cooling down


 Fukushima-1. Photo: EPA   

The temperature in the first three reactors of the crippled Fukushima-1 NPP has dropped below 100 degrees Celsius.

According to the Tokyo Electric Power company which operates the NPP, this is one of the main conditions for carrying out a so-called cold shutdown of the reactors.

Experts point out that when reactors are working in the normal regime their inside temperature usually reaches 300 degrees and before their transfer to a cold state it is necessary to keep them at a stable temperature below 100 degrees for a considerable time.

Laaska News.