Office for Nuclear Regulation

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Dungeness B Planned Intervention

Executive summary

Purpose of intervention

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).

Interventions Carried Out by ONR

The key interventions during the emergency equipment system based inspection were for licence compliance covering the following licence conditions (LC):

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable

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

For LCs 23 and 27, I inspected the availability of control rods, gas safety relief valves and emergency diesel generators, which are some of the key safety mechanisms, devices and circuits protecting the reactors.  The availability of these was required to comply with operating rules, which the licensee had implemented in the form of technical specifications.  I found some anomalies in the paper work for compliance, but noted that the plant itself was available.  I therefore concluded that there were sufficient of these safety mechanisms, devices and circuits available as required by licence condition 27 and that the plant was within the conditions and limits from the safety case for these systems as required by licence condition 23.  I therefore judged that compliance with these two licence conditions was adequate and hence assigned IIS ratings 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.

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 on the Station at this time.  Therefore, no additional regulatory action arising from this visit is considered necessary at this time.