The Atomic Weapons Establishment is due at Reading Magistrates Court later over a fire at its site at Aldermaston in Berkshire.
A worker received burns when the blaze broke out in August 2010. The company faces three charges brought by the Health and Safety Executive.
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Tuesday morning's weather for the west of the region
Tuesday morning's weather for the east of the region
A court has heard how 13 year old Alexander Worth was killed when a high-performance Ferrari F50 crashed on a farm track in Hampshire.