The British Office for Nuclear Regulation said that there had been no release of radioactive material and no injuries. Industry experts did not anticipate much effect on electricity supplies or prices in the short term.
EDF said that over the next few days it would idle a second reactor at the facility where the fault was found last year, Heysham 1, in northwest England. The company said it would also shut down two other reactors of similar design at Hartlepool in northeast England to investigate whether they had the same flaws.
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