Office for Nuclear Regulation

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Dungeness B Planned Intervention

Executive summary

Purpose of intervention

This was a planned intervention at EDF Energy Nuclear Generation Ltd's (NGL's) Dungeness B (DNB) power station, undertaken as part of the planned Integrated Intervention Strategy (IIS) for the Operating Facilities Programme of the Office for Nuclear Regulation (ONR).

Interventions Carried Out by ONR

The key inspections for licence compliance covered the following licence conditions (LC):

During this intervention, the following key activitity was also undertaken:

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

For LC 12, the arrangements for ensuring that maintenance tasks were completed by suitably qualified and experienced persons were inspected and found to be adequate. Implementation of the arrangements was also inspected by inspecting the training records for staff undertaking a sample of mechanical maintenance tasks and found to be in order. The site inspector considered that the use of the training record could be improved and hence recommended that the need to do this was re-inforced by station management. No formal actions were placed on the licensee and hence the inspection outcome was rated as green.

For LC 24, Dungeness B's strategy for improving procedures and human performance was reviewed, evidence from ONR records analysed and the application of procedures at Dungeness B inspected. The station had already recognised that it needed to improve Procedure Quality Use and Assurance (PQU&A) and had been working on this is some areas. The limited inspection possible during this intervention showed that there was still need for improvement. ONR had previously raised two separate issues related to procedure quality and procedural use and adherence. As a result of the inspection, a single issue was raised to replace these and cover all aspects of PQU&A, which required increased performance in this area. Further work was necessary to develop specific actions to achieve this and will be addressed during a future intervention. As a result of the inspection an action to seek improvement was raised and hence the inspection outcome was rated as amber.

In relation to the other activities undertaken in this intervention, no key findings arose.

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 obtained during this intervention, no matters have been identified that are likely to have a significant impact on nuclear safety or protection of the public in the event of an emergency on the Station at this time. Therefore, no additional regulatory action arising from this visit is considered necessary at this time.