Office for Nuclear Regulation

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EDF Heysham 2 Power Station - Unit 8 Reactor 816 (R816) 2016 Statutory Outage - Inspection of Electrical Related Aspects

Executive summary

Purpose of Intervention

The purpose of this intervention was to undertake a licence condition (LC) compliance inspection at EdF Energy Nuclear Generation Limited (NGL) Heysham 2 power station, in line with the inspection programme contained in the Heysham 2 Integrated Intervention Strategy (IIS) for 2016/17.

Interventions Carried Out by ONR

ONR specialist inspectors conducted a planned inspection and assessment of implementation of the arrangements for Licence Condition (LC) 28 Examination, Inspection, Maintenance and Testing (EIMT) at Heysham 2 Power Station.

The inspection considered the electrical work being undertaken as part of the Reactor 8 statutory outage, 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 outage.

Explanation of Judgement if Safety System Not Judged to be Adequate

No safety system inspection was undertaken, hence this is 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 electrical work undertaken as part of the reactor 8 statutory outage. The inspection confirmed that the planned EIMT and modification activities undertaken during the outage period were appropriate and that electrical plant and equipment being maintained is in accordance with the established arrangements.

Licence conditions are inspected against ONR’s published guidance requirements, as described in the technical inspection guides, which can be found at . Further information on Integrated Intervention Strategy (IIS) ratings, is available at

Conclusion of Intervention

From the sample inspected, it is judged that for the electrical work activities undertaken at Heysham 2 during the reactor 8 statutory outage, compliance against LC28 met the required standard and hence a ‘Green’ rating will be recorded against LC28.

Based on this targeted intervention no issues were identified from the electrical work activities that would prevent ONR granting Consent for reactor 8 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 this intervention, there were no matters identified that have the potential to impact significantly on nuclear safety.