Office for Nuclear Regulation

Planned System Inspection – Containment Systems

Executive summary

Purpose of intervention

The purpose of the intervention was to carry out planned inspections in accordance with the integrated inspection schedule for Dungeness A.

Interventions Carried Out by ONR

I carried out a systems inspection of the Containment Systems, specifically focussing on ponds and civil structures.

Explanation of Judgement if Safety System Not Judged to be Adequate


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

I met with the Site Director to discuss the revised nuclear baseline and organisational structures. I am satisfied that the revised baseline is broadly in-line with ONR expectations, but I suggested the licensee consider the addition of one role to be consistent with the baseline adopted at other sites.

I judged that the containment systems inspected meet the safety case functions and are being operated and maintained in accordance with the safety case and site arrangements.

I judged that the clarity of the alignment between limits and conditions in the safety case, with those in the nuclear safety schedule was clear and therefore judged compliance to LC23 to be good. The format and content of Station Operating Instructions and Plant Operating Instructions clearly translated these safety case requirements on to the plant.

To support the safety case, Dungeness A has recently developed a safety case management note which details the safety mechanisms, devices and circuits required for Licence Condition 27 compliance. I judged this document to be good practice in providing clarity on safety measures and safety mechanisms considered and safety measures implemented to support the safety case and meet LC27 compliance.  All other aspects of LC27 compliance were considered adequate.

One shortfall was identified with the arrangements for recording qualifications and experience for those carrying out civil inspections, as their competence reviews are carried out against a broad role profile, which does not include the specific inspection task. I am satisfied this is not a real safety concern as all those inspecting the civil structures were competent to do so, but this appears to be more of an administrative/records issue. The licensee agreed to address this issue.

I met with the Environment Agency inspectors while they were also at site. We discussed licensee performance, events, inspection plans and other matters of joint regulatory interest.

Conclusion of Intervention

Overall I judged that the systems inspected adequately meet their safety case functions and are being operated and maintained in accordance with the safety case. I found no issues that significantly affect safety. The minor actions identified will be followed up during future routine regulatory interactions with the licensee.