Office for Nuclear Regulation

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Hunterston A Inspection Week

Executive summary

Purpose of Intervention

This inspection was carried out as one of a series of planned inspections of operations undertaken at the Magnox Ltd Hunterston A (HNA) site.

Interventions Carried Out by ONR

Five Compliance Inspections relating to Licence Condition (LC) 14 (Safety documentation), LC15 (Periodic review), LC22 (Modification or experiment on existing plant), LC7 (Incidents on the site) and LC36 (Organisational capability) were undertaken together with an Action/Issue review and a meeting with Site Safety Representatives.

Explanation of Judgement if Safety System Not Judged to be Adequate


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

HNA were found to be complying adequately with their Arrangements under LC14 and a rating of No Formal Action (GREEN) was accordingly applied.

A rating of No Formal Action (GREEN) was applied to the LC15 inspection as HNA are currently complying adequately with their Arrangements. However, the scheduling of the next Periodic Safety Review for HNA needs to be addressed. Negotiations are currently underway with ONR to structure the way forward. A Regulatory Issue will be raised to ensure that progress can be captured.

A rating of Seek Improvement (AMBER) was applied for the LC22 inspection. This was primarily due to the HNA use of Concessions for Design Changes. The categorisation of an LC22 proposal was also challenged. Accordingly two Regulatory Issues will be raised and progress to closure will be tracked.

Two reactive inspections were undertaken concerning LC7 and LC36. Both of these inspections were rated as Seek Improvement (AMBER). LC7 was amber due to the lack of a trending process and associated data. Improvements have been sought and a Regulatory Issue will be raised. LC36 was amber due to gaps in the implementation of Arrangements. Again, improvement will be sought through a Regulatory Issue.

Overall, I consider that HNA have responded well to findings made by ONR in November last year relating to the use of concessions to progress design changes and sign-off of commissioning work.

Three Regulatory Issues have been successfully addressed by HNA and are duly closed.

Conclusion of Intervention

I consider that HNA compliance with the Licence Conditions inspected was shown to be adequate with the exception of the areas where amber findings were made where Regulatory Issues will be raised to track appropriate remedial actions.