This was a planned inspection 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 Civil Nuclear Reactor Programme (CNRP) of the Office for Nuclear Regulation (ONR).
The key interventions during this inspection were for licence compliance covering the following licence conditions (LC):
For LC 22, the inspection covered the management and implementation of modifications being conducted during the statutory outage on Reactor 22. All the sampled modifications were found to have been created and approved in accordance with EDF corporate process and their implementation was appropriately managed and recorded within the Asset Management System, although the justification of categorisation could be improved. We found some minor issues in some modifications, which were addressed during the inspection. Compliance against LC 22 was judged to be adequate and hence assigned an IIS rating of 3.
For LC 24, the station’s arrangements for production and management of operating instructions were generally found to be adequate with systems in place to ensure that operations that may affect safety are carried out in accordance with written instructions. This inspection highlighted that the station is undertaking activities to improve procedural use and adherence (PU&A), which are delivering results in areas such as place keeping. Further work was required to implement the licensee’s programme for continuous improvements in procedure quality and PU&A and a number of recommendations were highlighted where progress could be improved. These recommendations are being monitored via the ONR issues database under existing issues. Notwithstanding these improvements, compliance against LC 24 was judged to be adequate and hence assigned an IIS rating of 3.
For LC 30, ONR representatives attended the Mid-Outage Review Meeting, which was useful in ensuring that ONR and NGL understood each other’s expectations for the remainder of the outage and identified outstanding issues. Compliance against LC 30 was judged to be adequate and hence assigned an IIS rating of 3.
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.
From the evidence obtained during this intervention, no matters have been identified that are likely to have a significant impact on nuclear safety on the station at this time. Therefore, no additional regulatory action arising from this visit is considered necessary at this time.