Office for Nuclear Regulation

Readiness Inspection for Implementation of Engineering Improvements

Executive summary

Purpose of Intervention

This intervention, conducted at the Devonport Royal Dockyard Limited (DRDL) Devonport licensed site, was undertaken to conduct a readiness review to sample the implementation of a modification to improve the 15 Dock dockside cranes protection systems. This would support the close out of decision record ONR-OFD-DR-17-021.  The intervention also incorporated a scheduled licence condition compliance inspection as part of the 2018/19 intervention plan and propulsion sub-division strategy.

Interventions Carried Out by ONR

The inspection examined the implementation of the modification which introduced engineered improvements to the 15 Dock portal cranes.  The inspection sampled the updated documents and arrangements, inspected the physical modifications to confirm that they had been adequately implemented and reviewed the activities required to be completed before the dockside cranes were returned to service.

This inspection also examined the implementation of DRDL’s arrangements for Licence Condition (LC) 23 operating rules (ORs) and LC24 operating instructions in relation to this modification.

The intervention was performed in line with ONR's guidance requirements (as described in our technical inspection guides) in the areas inspected.

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable

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

From the evidence obtained from DRDL during this inspection, I am of the opinion that:

The implementation of the range of new engineering safeguards has brought the 15 dock cranes in line with those on 9 dock.  This has improved the reliability of the safety systems and enabled the removal of an administrative control through the introduction of an engineered protection system.

DRDL were also considered to have made adequate progress against relevant existing regulatory issues in implementing modifications to improve the 15 dock crane protection systems.

No matters were identified as requiring immediate regulatory attention during the conduct of this compliance inspection.

Conclusion of Intervention

No matters were identified as requiring immediate regulatory attention during the conduct of this readiness review and LC 23 and 24 compliance inspection

I was satisfied that the safety documentation had been updated to reflect the modification to improve the 15 Dock dockside cranes protection systems.  I was also satisfied that operations were being controlled and carried out in compliance with the conditions and limits that DRDL has identified as being necessary in the interest of safety.  I was also satisfied that the maintenance operations had adequate written instructions which included: the instructions necessary in the interest of safety and those required to ensure ORs were implemented.  As such I rated the inspection as a Green for both LC23 and LC24.