Office for Nuclear Regulation

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Sizewell B - Licence Condition Compliance Inspection of LC25 and IAEA OSART mission

Executive summary

Purpose of intervention

The purpose of this intervention was to undertake licence condition (LC) compliance inspections at EDF Energy Nuclear Generation Limited (NGL) Sizewell B power station, in line with the inspection programme contained in the Sizewell B integrated intervention strategy (IIS) for 2015/16.

Interventions Carried Out by ONR

As part of this intervention, I carried out a compliance inspection against licence condition LC 25: Operational records.  The inspection was based on sampling the implementation of the arrangements in place at the station against the licence condition and ONR inspection guidance.  This intervention record also reports a number of regulatory information exchanges with the site and the International Atomic Energy Agency (IAEA) Operational Safety Review Team (OSART) mission.

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable to this intervention.

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

The Licensee has defined primary implementation and secondary supporting documents for compliance with LC 25.  The station operational records cover a wide ranging area, as expected in support of site licence conditions and other statutory requirements.  There is also clear identification of record owners with responsibility for each record series and, from the sample of records inspected, these are being stored and controlled adequately.  A number of minor observations were noted for which the Licensee raised appropriate actions to address.  From the evidence seen and the discussion held with station personnel, I judge that the arrangements sampled for compliance with LC 25 are adequate; with no regulatory issues being raised.

The IAEA OSART mission presented an overview of its findings to EDF NGL, ONR and Department of Energy and Climate Change (DECC) at the mission exit meeting.  The mission identified recommendations, suggestions, good practices and good performances.  Recommendations were included in the areas of operations, maintenance and operating experience feedback.  EDF NGL has responded positively with a commitment to take action in regard to the recommendations with associated action plans.  The mission report will be completed by the OSART team within three months.

I had a general information exchange with the technical safety support manager.  I was provided with an update of the recent incident during commissioning of dry fuel store equipment.  The incident involved damage to a transportation stand.  There were no nuclear or radiological consequences, however the station has started an investigation. I am satisfied with the initial actions and response taken by the station and will monitor developments under normal site intervention.

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 information gathered and evidence obtained during this intervention, no matters have been identified that are likely to have significant impact on nuclear safety on the station at this time. Therefore we consider that no additional regulatory action arising from this visit is necessary currently, and the interventions for Sizewell B power station, set out in the integrated intervention strategy, should continue to be implemented as planned.