Office for Nuclear Regulation

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Sizewell B - LC32 inspection

Executive summary

Purpose of Intervention

This was a planned intervention at Sizewell B Power Station, operated by EDF Energy Nuclear Generation Limited (EDF NGL) in accordance with ONR’s Intervention Plan for the site.  The intervention was carried out to assess EDF NGL’s compliance with Licence Condition (LC) 32 (accumulation of radioactive waste).

The intervention was carried out jointly with the Environment Agency (EA), to support a themed intervention on the management of higher activity waste on nuclear licensed sites.

Interventions Carried Out by ONR

The intervention focused on the licensee’s arrangements and their implementation for compliance against Licence Condition (LC) 32, and made use of the following ONR guidance:

I also discussed options for the future management of spent Sizewell B ion exchange resin with activity levels at the borderline between Low Level Waste (LLW) and Intermediate Level Waste (ILW).

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

As part of this intervention, EDF NGL provided an overview of the higher activity waste arrangements.  With regards implementation of the higher activity waste arrangements at SZB, I focussed on the management of non-fuel core components and Intermediate Level Waste ion exchange resins.  I also undertook a plant walk-down of relevant areas.

On the basis of the evidence sampled, taking into account my interactions with EDF NGL staff and observations during the plant walkdown, I judge that the licensee’s arrangements for higher activity waste management and their implementation on site for compliance with LC32 was consistent with relevant good practise.  I am satisfied that the licensee is complying with its legal duties.  Overall, I consider that an inspection rating of GREEN is appropriate.

In relation to the future management of borderline ILW ion exchange resins, EDF are currently undertaking an optioneering study to identify the optimum solution.  Once completed, EDF have agreed to send a copy of the study to ONR.  This action will be captured on the EDF action tracking system.

Conclusion of Intervention

There are no findings from this intervention that could undermine nuclear safety at this time.  Therefore, no additional regulatory action is needed over and above the planned interventions at Sizewell B Power Station.