Office for Nuclear Regulation

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Hunterston B - Planned 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).

Interventions Carried Out by ONR

We performed a system based inspection (SBI) to confirm the implementation of safety claims made against the Station’s emergency equipment. This inspection was undertaken by the ONR site inspector, with technical support provided by an internal hazards specialist. During this intervention we examined the Licensee’s compliance with the following licence conditions (LCs):

LC 34 (leakage and escape of radioactive materials) was not included in the SBI as we judged that it was not applicable to this system.  Compliance with LC 27 was also not included as we did not consider that the emergency equipment sampled meets the definition of safety mechanisms devices and circuits (SMDC) contained within NS-INSP-GD-027.

The intervention was performed in line with ONR’s guidance requirements (as described in our technical inspection guides) in the areas inspected.

Explanation of Judgement if Safety System Not Judged to be Adequate

From the inspection, ONR judged that the emergency equipment met the requirements of the safety case.

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

Conclusion of Intervention

From the evidence sampled during this SBI-10 inspection against LCs 10, 23, 24 and 28, we consider that the emergency equipment met the requirements of the safety case.

There are 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.