Office for Nuclear Regulation

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Site inspection of Hunterston A

Executive summary

Purpose of intervention

This report covers interventions in pursuit of the ONR integrated intervention strategy for Hunterston A, in particular to address regulatory issues identified as part of Inspection plan and carry out the planned Compliance inspections.

Interventions Carried Out by ONR

This report covers interventions at Hunterston A mainly to address Compliance inspection and follow-up of regulatory actions placed on the site from previous inspections as follows:

Explanation of Judgement if Safety System Not Judged to be Adequate


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

Only the compliance inspections are included in the executive summary as all other interventions are for information only.

LC 23 - The focus of the intervention was to consider the LC 23 arrangements for Magnox and the understanding of how Magnox staff on site applies them. I have rated the intervention as a 4 (IIS inspection). The Operating Rule that has been identified has been implemented appropriately by the site. However, the understanding and possible interpretation of the corporate arrangements means that the number of operating rules is insufficient. This will be discussed with the ONR Magnox corporate inspector to gain understanding of whether this is a corporate problem or one of local (site) interpretation.

LC 24 - The focus of the intervention was to consider the LC24 arrangements and their application on the site. I have rated the interventions as a 3 (inspection) adequate. I note that the documentation was generally adequate, but that safety improvements in terms of clarity and additional steps could easily be added to enhance the documents and overall safety.

LC 11 - The focus of the intervention was to view the demonstration exercise and consider the adequacy. The intervention is rated as a 3 (Adequate) in line with ONR inspection guidance. However, certain further points of improvement were noted.

Conclusion of Intervention

Some areas of improvement have been identified both for the site and for the Magnox corporate position with regard to the arrangements, but generally the arrangements are in line with regulatory expectations. There will be discussion with the ONR Magnox corporate inspector with regard to the understanding of Operating rules and their interpretation and implementation by Magnox on a corporate basis as it does not appear to align with ONR inspection and assessment guidance.