Office for Nuclear Regulation

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Sizewell B - LC4 and LC5 Inspection and Site Stakeholder Group Meeting

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 2016/17.

Interventions Carried Out by ONR

As part of this intervention, I carried out compliance inspections against licence conditions LC 4: Restrictions on nuclear matter on the site, LC 5: Consignment of nuclear matter. The inspection was based on sampling the implementation of the arrangements in place at the station against the licence condition and ONR inspection guidance. I also attended the Sizewell Stakeholder Group meeting during this visit.

Explanation of Judgement if Safety System Not Judged to be Adequate

No safety system inspection was undertaken, hence this is not applicable.

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

I found the written arrangements in place to comply with LC 4 to be in line with ONR expectations; however, one omission was that there was no definition of "Nuclear Matter" in either the corporate (EDF) or site specific documentation. It was evident that the operators I spoke with did have an understanding of the definition and this omission has not had any impact on the adherence to the arrangements. This inspection was rated as Green taking into account this minor compliance issue.

The arrangements in place to comply with LC 5 are in line with ONR expectations and are being complied with at Sizewell B. However, the arrangements lack a number of definitions that would be expected by ONR (e.g. Nuclear Matter, Radioactive Waste, Consign, Excepted Matter, Relevant Site and Radioactive Material). Again, it was evident that the operators I spoke with did have a clear understanding of these definitions and the sampling of records that I undertook did not identify any breach of LC 5(1). This issue with definitions has already been captured by ONR and is being addressed at a corporate level with the Licensee. I have rated this inspection as Green, taking in to account the adherence to the arrangements and the operators' demonstrable understanding of the requirements of LC 5.

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 I 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.