Office for Nuclear Regulation

This website uses non-intrusive cookies to improve your user experience. You can visit our cookie privacy page for more information.

Dungeness B - Planned Intervention and ARoS

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 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:

Explanation of Judgement if Safety System Not Judged to be Adequate

From our inspection, we judged that the instrument air and turbine overspeed systems fulfil the safety functional requirements of the safety case.

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

From the system based inspection on the instrument air and turbine overspeed systems, we concluded that:

I reviewed the licensee's progress against a regulatory issue and evaluated the licensee's response to incidents occurring on the site. No significant safety concerns were raised and I confirmed that the station was taking appropriate action.

We attended the Annual Review of Safety Meeting, including a plant walk-down. We are pleased to observe that investment is being made at the station and we continue to seek timely delivery of further nuclear safety improvements. The meeting was considered to be effective and encouraged open discussion and challenge on a number of safety areas.

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

After considering the evidence presented by NGL, we concluded that the arrangements and their implementation, associated with the instrument air and turbine overspeed systems met the requirements of the safety case. An IIS rating of Green (no formal action) is considered to be appropriate. Two level 4 regulatory issues were raised in order to monitor agreed remedial actions against two minor compliance shortfalls relating to training and maintenance schedule.

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