The Sellafield site has been closed to all day workers in response to an operational condition. The firm says the decision has been taken with the safety and security of the workforce as a priority. The site remains at normal status.
Sellafield Ltd have confirmed that the radioactivity detected by one of the site's monitors overnight was the result of "naturally occurring Radon", and not because of any issue or problem at the site.
Working operations are continuing and the day staff sent home today are due back in on Monday as normal.
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