Office for Nuclear Regulation

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Sizewell B - Cross-Cutting Lightening Hazard Inspection

Executive summary

Purpose of Intervention

The work was carried out in-line with the planned ONR Project Task Sheet TS065.

This was a reactive unplanned inspection of EDF Energy Nuclear Generation Ltd.'s (NGL's) Sizewell B Power Station, undertaken for the Operating Facilities Division (OFD) of the Office for Nuclear Regulation (ONR).

Interventions Carried Out by ONR

During this intervention, an inspection of the Lightning Protection System was undertaken, during which compliance against the following licence conditions (LC) was examined.

Explanation of Judgement if Safety System Not Judged to be Adequate

No system based inspection was undertaken during this intervention.

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

From the inspection on the Lightning Protection System ONR concluded that:

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

Conclusion of Intervention

From the evidence sampled during this inspection against LCs 10, 23, 24, 27, 28 and 34, ONR consider that the Lightning Protection System 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 Sizewell B Power Station as set out in the Integrated Intervention Strategy, which will continue as planned.