REFILE-UPDATE 5-British nuclear plant says radiation alert due to natural radon gas

Sellafield tells non-essential staff to stay at home

* Britain says no danger to the public or workers

* State nuclear body says source of radiation unclear

By Kate Holton and Costas Pitas

LONDON, Jan 31 - Britain's Sellafield nuclear fuel reprocessing plant ordered all non-essential staff to stay at home on Friday while it investigated an elevated radiation reading onsite, which it later concluded was caused by naturally occurring radon gas.

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