Office for Nuclear Regulation

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Hunterston B - Licence Condition 16 and 22 compliance inspections

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) for 2018/19.

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, along with specialist emergency preparedness and response inspectors, 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

Licence Condition 16 (Site plans, designs and specifications) - I inspected the site procedures for preparation of a site plan and building schedule.  I found that the procedures are adhered to and revisions are made to the site plan under the station LC22 modifications process.  However, there is a lack of clarity on responsibility for providing oversight of changes to the site plan and for providing revised versions of the site plan to ONR.  A regulatory issue will be raised to address this matter. I therefore assigned a rating of Green (no formal action) for LC16.

Licence Condition 22, (Modification or experiment on existing plant) - From the sample of the governance and oversight applied to modifications to plant at the station, I judged that site is meeting relevant good practice.  The defeat of fuel route interlocks and urgent and temporary modifications procedures are also understood and are being used appropriately at the station.  Whilst a regulatory issue will be raised to improve the quality of self-audits of the urgent modifications index and defeat of interlocks registers, I have rated this inspection as Green, no formal action.

Conclusion of Intervention

There were 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.