Office for Nuclear Regulation

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System based inspection (SBI) at the BAE Systems Marine Ltd (BAESML) Barrow site

Executive summary

Purpose of intervention

This was a system based inspection, (SBI) conducted jointly by ONR and the Defence Nuclear Safety Regulator (DNSR), of systems important to the control of reactivity at the BAE Systems Marine Ltd (BAESML) Barrow site, undertaken as part of the planned inspection programme for 2016/17.

Interventions Carried Out by ONR

Inspectors carried out an SBI of several safety systems in place to maintain criticality control during submarine build at the Devonshire Dock Complex (DDC). The two inspection teams involved ONR and DNSR inspectors, ONR specialist inspectors and DNSR support contractors. Two members of BAESML’s internal Nuclear Safety Regulation Department accompanied and facilitated the inspection.

Explanation of Judgement if Safety System Not Judged to be Adequate

The criticality controls inspected during this SBI were judged to be adequate.

Key Findings, Inspector's Opinions and Reasons for Judgements Made

The inspection team made the following findings in relation to the arrangements made under the relevant applicable licence and authorisation conditions:

Conclusion of Intervention

Based upon the evidence examined during this SBI, we consider that BAESML has adequately implemented the safety case associated with criticality control.  No new regulatory issues were raised during this SBI.