The operation to stabilise the Fukushima Daiichi nuclear power plant has suffered a setback after officials said they had detected small traces of a radioactive gas that is a byproduct of nuclear fission.
The discovery was made as a nuclear reactor in south-western Japanbecame the first to start generating electricity following a series of shutdowns in the wake of the 11 March earthquake and tsunami.
The operator of Fukushima Daiichi, Tokyo Electric Power (Tepco), said it had found signs of recent nuclear fission inside the No 2 reactor, one of three at the plant that suffered core meltdown in March.
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