Office for Nuclear Regulation

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Hunterston B Power Station Planned Intervention

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, we carried out a licence condition (LC) compliance inspection against LC10 - Training and LC12 - Duly authorised and other suitably qualified and experienced persons and focused on the implementation of the arrangements on the upcoming statutory outage.

I carried out follow up enquiries related to a recently reported event associated with technical specification compliance.

This report also covers the site visit by ONR's Chief Nuclear Inspector (CNI) and Chief Executive (CE).

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

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 10 (Training) and Licence Condition 12 (Duly authorised and other suitably qualified and experienced persons) - 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 LC10 and LC12 compliance.

From the follow up enquiries carried out on the recent incident reported related to technical specification compliance I have concluded that the incident does not meet ONRs investigation criteria and that no formal investigation is required.

I consider that the risk from this incident is negligible due to the number of control measures remaining, however I judge that this was an administrative breach of Licence Condition 23 - Operating Rules and it is proportionate to issue an enforcement letter as a result of this incident.

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.