Office for Nuclear Regulation

L4 Mechanical Meetings Site Inspection Week

Executive summary

Purpose of intervention

This report covers interventions in pursuit of the ONR integrated intervention strategy for Devonport Royal Dockyard Ltd (DRDL). 

Interventions Carried Out by ONR

This report covers interventions at DRDL, which addresses the following compliance inspections:

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable

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

LC 28 (EIMT) - The purpose of the intervention was to undertake an inspection of the Licensees arrangements (excluding implementation), which requires the Licensees to establish and implement adequate arrangements for the regular and systematic EIMT of all plant which may affect safety.  ONR considers DRDL’s LC 28 arrangements to be adequate, although a follow up of the implementation of the arrangements will be required. 

Vanguard Deep Maintenance Period (VDMP) Primary Circuit Decontamination (PCD) Facility – The technical mechanical and internal hazard discussion, surrounding the use of the PCD, supports DRDL’s request for the ONR to permission VDMP.

Conclusion of Intervention

The arrangements for LC28 were examined and deemed to be adequate.  Discussions on aspects of Primary Circuit Decontamination Facility’s ability to support the Vanguard maintenance period did not reveal any matters that would preclude a permission from a mechanical engineering perspective.