Office for Nuclear Regulation

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Hunterston A LC21 inspection

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 the inspection plan and carry out the planned Compliance inspections.

Interventions Carried Out by ONR

This report covers interventions at Hunterston A to address compliance 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 and relevant follow-up meetings are included in this executive summary, as all other interventions were for information only.

LC 21 – The intent was to undertake a readiness inspection of the WILREP facility at Hunterston A prior to the facility moving to active commissioning.  The facility is about six to eight weeks from active commissioning and the inspection is to consider the position of the facility and the team in terms of readiness.  Based on the findings of the inspection listed above, the regulatory decision was that the project was not ready to move into active commissioning given the number of regulatory items found.  On this basis the inspection is rated a 4 (below standard).  However, it should be noted that the site and the project team engaged positively with the inspectors and the inspectors consider the project to be able to achieve a position of readiness relatively quickly.

Conclusion of Intervention

The inspections highlighted a number of findings and those finding that require to be completed prior to moving to active commissioning will be congregated into a single Level 3 issue and subject to ONR's due process, placed on the issues database.  These findings will be communicated to site via a letter.  Additional findings from the inspection, that are considered areas for improvement, will be congregated into a single level 4 issue and will be placed on the issues database and the site informed.  A further readiness inspection will be undertaken by the ONR team once the project have addressed the points in the level 3 issue and consider themselves ready for re-inspection.