Office for Nuclear Regulation

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Planned inspection of Dungeness B power station

Executive summary

Purpose of Intervention

This was a planned inspection of EDF Energy Nuclear Generation Ltd's (NGL's) Dungeness 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-line with the planned inspection programme contained in the Dungeness B Integrated Intervention Strategy (IIS).

Interventions Carried Out by ONR

During this intervention, the following key activities were undertaken:

I the nominated site inspector was supported by two ONR electrical specialist inspectors in undertaking an SBI on the Dungeness B Electrical - Transformers, Grid Systems and Main Electrical System.

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 our inspection, we judged that the electrical systems, including Transformers, Grid Systems and Main Electrical System can fulfil the safety functional requirements of the safety case.

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

From the SBI of the Electrical systems, including Transformers, Grid Systems and Main Electrical System, we concluded that:

I followed up on a number of ONR reported events and discussed operational performance. No significant safety concerns were raised and I confirmed that the station was taking appropriate action.

I attended the Dungeness Site Stakeholder Group Meeting and presented the ONR quarterly report for Dungeness B. No significant queries were raised to ONR.

Conclusion of Intervention

After considering all of the evidence presented by NGL we concluded that the arrangements and their implementation, associated with the electrical systems (including Transformers, Grid Systems and Main Electrical System) met the requirements of the safety case and were adequate. An IIS rating of Green (no formal action) is considered to be appropriate for the system based inspection and a single regulatory issue has been raised relating to full and accurate maintenance records.

There are no findings from the interventions that could significantly undermine nuclear safety.