Office for Nuclear Regulation

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 intervention strategy for the Civil Nuclear Reactor Programme (CNRP) of the Office for Nuclear Regulation (ONR).

Interventions Carried Out by ONR

The key interventions during this inspection were for licence compliance covering the following licence conditions (LC):

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

A team of three inspectors assessed the sites annual level 1 demonstration emergency exercise to demonstrate compliance with LC 11.  The exercise was a challenging one, starting with an insider sabotaging the plant and initiating a radioactive release with a range of problems for the site to deal with.  Whilst the site dealt with these adequately, we judged that the way in which it did so could have been improved.  The improvements relating to security elements of the exercise will be progressed by ONR’s CNS programme.  The access control point had a high workload during the exercise and dealt with the plant problems and locating missing persons, although the way it did so fell short of the standard that we expected.  We therefore required the site to demonstrate an improved performance to the site inspector during a routine shift exercise.  Overall we judged that the site dealt with the scenario satisfactorily.  We deemed compliance with LC 11 to be adequate and have assigned it 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.

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.