Office for Nuclear Regulation

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Planned inspection of Hunterston B Power Station

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 accord with the planned inspection programme contained in the Hunterston B Integrated Intervention Strategy (IIS).

Interventions Carried Out by ONR

As part of this intervention, the Outage Project Inspector and I carried out a licence condition (LC) compliance inspection against LC26 - Control and supervision of operations and focused on the implementation of the arrangements during the ongoing statutory outage.

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

I also attended various meetings and received an update on the progress being made against regulatory issues raised during previous interventions.

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

Licence Condition 26 (Control and supervision of operations) - I held several discussions with contract management and maintenance personnel to understand how the control and supervision function is delivered at site. I also undertook plant visits to observe supervision in the field to confirm that procedures for control and supervision were being implemented satisfactorily. I judged that the licensee was meeting relevant good practice when compared to ONR guidance and have therefore assigned a rating of Green (no formal action) for LC26 compliance.

The licensee continues to make satisfactory progress against the regulatory issues raised previously.

An explosion occurred on the National Grid site adjacent to the Hunterston B site. I confirmed that nuclear safety of the reactors was unaffected by this event and that the Hunterston site made an appropriate response to confirm safety on the wider site.

Conclusion of Intervention

There are no findings from this inspection that could significantly undermine nuclear safety. At present, no additional regulatory action is needed over and above the planned interventions at Hunterston B Power Station as set out in the Integrated Intervention Strategy, which will continue as planned.