The latest cost of decommissioning at Sellafield is due to be released today.
The Nuclear Decommissioning Authority will present the figures to Parliament.
There has already been severe criticism of previous over-spends, which have put up the costs to 70 billion pounds.
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Dangerous chemicals stored in a laboratory at the nuclear reprocessing plant have now been detonated by an army bomb disposal team.
Explosives experts were called to the nuclear reprocessing site in Cumbria, to help deal with chemical substances.