Alarm systems at a nuclear weapons site were down for ten days after heavy flooding, leaving residents vulnerable to a potential accident.
A report said electricity to "virtually the whole of" the Atomic Weapons Establishment (AWE) site at Burghfield, Berkshire, was switched off when it was flooded during torrential rain on July 20 last year.
Campaign group Nuclear Information Service (NIS) said it was fortunate that staff had gone home for the weekend by the time the water peaked so no radioactive material was in use in the assembly area