Office for Nuclear Regulation

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Planned inspection at Devonport Royal Dockyard Limited (DRDL) licensed site

Executive summary

Purpose of intervention

This was a planned inspection on the Devonport Royal Dockyard Ltd (DRDL) licensed site, undertaken as part of the planned inspection programme for 2016/17.

Interventions Carried Out by ONR

The site inspector for the Submarine Refit Complex (SRC) and I (Specialist Electrical Inspector) carried out a System Based Inspection (SBI) of the Electrical Supplies and 60Hz Diesel Generators. We were accompanied and assisted by a second ONR Electrical Specialist. DNSR was made aware of the SBI but did not participate in the inspection.

Explanation of Judgement if Safety System Not Judged to be Adequate

The Electrical Supplies and 60Hz Diesel Generators were judged to meet the requirements of the safety case and were adequate.

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

The ONR team carried out a system based inspection of the Electrical Supplies and 60Hz Diesel Generators and concluded that:

Conclusion of Intervention

Based upon evidence examined during this inspection, we consider that the requirements of the safety case with regard to Electrical Supplies and 60Hz Diesel Generators have been adequately implemented.

There are no findings identified from this inspection that could significantly undermine nuclear safety. However, areas for improvement were identified related to the clarity and provenance of safety functional requirements, equipment labelling, training, control of documentation, particularly that associated with Examination, Inspection, Maintenance and Testing. These were conveyed to licensee staff at the inspection debriefing meeting.

Several ONR Issues have been identified as a result of this inspection and these will be formally communicated to the licensee in a letter and will be followed up by ONR as part of routine regulatory business.