Office for Nuclear Regulation

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Dungeness B System Based Inspection (SBI06)

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 Programme (OFP) 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 Emergency Generation system met the requirements of the safety case and was adequate.

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

From the System Based Inspection on the Emergency Generation System we concluded that:

The outage intentions meeting was well attended and the majority of ONR's queries were addressed during the meeting.  It was agreed to start routine engagements with the DNB outage coordinator in February 2017 to discuss ONR's forthcoming interactions to support the permissioning work.  

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

The system based inspection resulted in areas of improvement being identified in response to minor compliance shortfalls relating to plant condition and compliance with the associated safety case. Two level 4 regulatory issues were raised in order to monitor the agreed remedial action.  After considering all of the evidence presented by EDF NGL we concluded that the arrangements and their implementation, associated with the Emergency Generation 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 this intervention.

In relation to LC30, I judge that an IIS rating of Green (no formal action) is warranted on the basis that the station has presented a detailed scope for the forthcoming statutory outage as required by its plant maintenance schedule.