Office for Nuclear Regulation

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Site inspection - 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

The safety system, ventilation was judged adequate, although there are queries about the compliance of systems against certain licence conditions and the adequacy of the safety cases presented.

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 2 - consisted of a inspecting the site boundary. This was conducted by tracing a boundary map provided previously. I consider the boundary is reasonably well marked, but some work needs to be undertaken in order to address my observations, I therefore consider the situation to be rated as adequate.

LC8 - consisted walking the site and inspecting a sample of warning/emergency notices in line with Technical Inspection Guide (TIG) 8. Samples from each schedule were chosen at random throughout the walkdown and checked against the schedule, all were found to correct. I was content that suitable and sufficient warning/emergency notices were in place and that these were regularly inspected, I therefore consider the situation to be rated as a good standard.

Conclusion of Intervention

The system based inspection highlighted areas of good practice and areas of deficiency within the safety case and facilities viewed. A letter will be sent to site detailing the findings of the inspection and requesting site to address the deficiencies found. There will also be engagement with the ONR corporate inspector on the derivation of LC 27 Safety mechanisms, devices and circuits.