Office for Nuclear Regulation

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Hunterston B Power Station LC 28 Inspection

Executive summary

Purpose of Intervention

The purpose of this intervention was to undertake a Licence Condition (LC) 28 compliance inspection at EdF Energy Nuclear Generation Limited (NGL) Hunterston B Power Station, in line with the inspection programme contained in the Hunterston B Integrated Intervention Strategy (IIS) for 2017/18.

Interventions Carried Out by ONR

I undertook a planned inspection and assessment of implementation of the arrangements for LC 28 Examination, Inspection, Maintenance and Testing (EIMT) at Hunterston B Power Station.

The inspection sample targeted the planned electrical work being undertaken as part of the Reactor 4 / Turbo Generator (TG) 8 2017 periodic shutdown, including the planned electrical EIMT activities from the station's Outage Intentions Document, the implementation of the detailed modifications and any reactive electrical work emergent from the shutdown.

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable.

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

Based on the discussions, explanations and the sample inspected, on this occasion, ONR was satisfied that there were no significant shortfalls identified with the implementation of the established arrangements for LC 28 EIMT in relation to the planned electrical work undertaken as part of the Reactor 4 / TG 8 2017 periodic shutdown. The targeted inspection undertaken confirmed that the planned EIMT and modification activities during this shutdown were appropriate and that electrical plant and equipment that was being maintained was in accordance with the established arrangements.

Overall, the outcome from the safety inspection of the shutdown related electrical activities for the Reactor 4 / TG 8 2017 periodic shutdown was that the implementation of the LC 28 arrangements for the electrical equipment was found to be adequate; therefore a green inspection rating was awarded.

Licence conditions are inspected against ONR's published guidance requirements, as described in the technical inspection guides, which can be found at Office for Nuclear Regulation (ONR) Compliance inspection - Technical inspection guides. Further information on Integrated Intervention Strategy (IIS) ratings, is available at Office for Nuclear Regulation (ONR) - Intervention Records.

Conclusion of Intervention

From the sample inspected, it is judged that, for the electrical work activities undertaken at Hunterston B during the Reactor 4 / TG 8 2017 periodic shutdown, compliance against LC28 met the required standard, therefore a ‘Green' rating was given.

Based on these targeted interventions there were no issues identified from the electrical work activities which would prevent ONR granting Consent for Reactor 4 / TG8 to return to service. This is subject to the completion of the planned EIMT activities, the implementation of the detailed modifications and the completion of emergent electrical work.

From the evidence gathered during these interventions, there were no matters identified that have the potential to impact significantly on nuclear safety.