Office for Nuclear Regulation

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LC21 inspection of electrical system commissioning

Executive summary

Purpose of Intervention

This was an unplanned inspection carried out as part of ONR’s permissioning regime for the Tails Management Facility (TMF) at the Capenhurst nuclear licensed site.

Interventions Carried Out by ONR

The by-product of uranium enrichment is depleted uranium hexafluoride, known as tails.  A new facility, the Tails Management Facility (TMF), is being constructed at Capenhurst  to convert these tails to an oxide of uranium, a chemical form more suitable for long-term storage.

The licensee for the Capenhurst site is Urenco UK Ltd.  The TMF is being constructed by, and will be operated by, Urenco Chemical Plants Ltd (UCP), a tenant on the Capenhurst site.

This inspection was part of an ongoing programme of interventions of the inactive commissioning of the facility.  This programme is being carried out to inform the regulatory permissioning decision to permit active commissioning in the future.

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

From the evidence seen during the inspection of the completion and energisation of the TMF electrical systems I am of the opinion that commissioning activities are being adequately controlled so as to comply with the licensee’s and tenant’s arrangements for LC21.

Conclusion of Intervention

My conclusion from the findings of the inspection is that electrical commissioning activities at the TMF are being carried out in accordance with the site’s arrangements and meet regulatory expectations.