The quantity of fissile material in a facility was more than 25% over the criticality limit.
Safety latest news
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Four-fold increase in nuclear convoy problems from 2016 to 2019
MoD recently released figures in response to a Freedom of Information request.
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DNSR report Information Tribunal: summary of day one
The key points from the hearing, Monday 2nd January.
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Key documents from Information Tribunal hearing on DNSR report
Witness statements and skeleton arguments submitted to the tribunal
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Devonport fined £600,000 for crane near-miss
Devonport pleaded guilty to the charges, which related to an incident where a stack of crane weights narrowly missed a worker
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Devonport in ‘special measures’: no end date in sight
Devonport Royal Dockyard Limited (DRDL) remains under enhanced regulatory attention by the Office For Nuclear Regulation (ONR), and no date is given for an expected return to routine regulatory attention.
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AWE will miss 2020 date to leave ‘special measures’
Aldermaston and Burghfield will both remain in enhanced regulatory attention until at least 2021, a year longer than previously expected.
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Government claims releasing nuclear safety assessment would risk national security
All the regulator's reports since April 2015 have been censored.
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AWE fined £1 million for electrical injury incident
The fine was the highlest level for an incident of this type.
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Safety issues may call time on Burghfield warhead assembly plant
Even with immediate changes ONR will only allow operations for a limited time.
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Dreadnought prototype review exposes flaws in naval reactor programme
Senior academics criticised a 'culture of optimism' within the programme.
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Ministry of Defence censors nuclear safety reports
The MoD claims that to release the reports would endanger national security