Office for Nuclear Regulation

Hunterston B - Reactor 4 Return to Service inspection and other meetings

Executive summary

Purpose of Intervention

This was a planned inspection of EDF Energy Nuclear Generation Ltd.’s (NGL’s) Hunterston B Power Station, undertaken as part of the planned intervention strategy for the Operating Facilities Division (OFD) of the Office for Nuclear Regulation (ONR).

The work was carried out in accordance with the planned inspection programme contained in the Hunterston B Integrated Intervention Strategy (IIS) for 20120/21.

Interventions Carried Out by ONR

As part of this intervention I, the nominated site inspector, carried out inspections against:

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

I also held a number of routine meetings and received updates on the progress being made to close out regulatory issues previously raised.

Explanation of Judgement if Safety System Not Judged to be Adequate

No system based inspection was undertaken, hence this is not applicable for this intervention.

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

The LC9 inspection found that station has a robust process for ensuring staff and contractors receive adequate instruction on the risks and hazards associated with plant on site.

The LC 28 EMIT inspection was carried out in support of the return to service of Reactor 4.  The inspection confirmed that there is a clear understanding of the work scope to re-commission Reactor 4 and that a robust process is used to track and record the progress.  The plant inspection examined the Reactor 4 Gas Circulator Hall and the Unit 8 Turbine hall and confirmed the systems had been maintained to high standard, all plant preservation modifications had been removed and only a very few and minor defect cards were present.  I was therefore satisfied that station continues to make adequate progress towards re-commissioning and return to service of Reactor 4.

Conclusion of Intervention

From the sample of the governance and oversight applied to the return to service of Reactor 4 at Hunterston B, I judged that station is robustly applying its re-commissioning processes and that no issues were identified that could impact nuclear safety.  The inspections for LC 28 (Reactor 4 return to service) and LC 9 (instruction to persons on the site), were rated Green, no formal action.