Office for Nuclear Regulation

Sizewell B - Planned Compliance Inspections

Executive summary

Purpose of Intervention

The purpose of this intervention was to undertake licence condition (LC) compliance inspections at EDF Energy Nuclear Generation Limited’s (NGL) Sizewell B Power Station, in line with the ONR’s Operational Facilities Division intervention strategy. The intervention was carried out by the ONR site inspector.  

Interventions Carried Out by ONR

I performed an inspection to evaluate compliance with site licence condition (LC) 22 (Modifications or experiments on existing plant), which is an applicable provision of the Energy Act 2013. During my LC22 inspection, I examined the licensee’s arrangements to control modifications to its catalogue of spares and consumable materials.

I also met with NGL senior management and staff to review progress against regulatory issues and findings from previous inspections. As part of this work, I reviewed implementation of NGL’s document control arrangements to confirm learning from a previous ONR inspection had been taken into account.

I attended a meeting of the Sizewell Site Stakeholder group. 

The intervention was performed in line with ONR's guidance requirements (as described in our technical inspection guides) in the areas inspected.

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable – no system based inspections were completed during this intervention.

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

LC22 - Modifications or experiments on existing plant

I selected a number of changes to the catalogue of plant spares made within the past two years for sample inspection. I confirmed that documentation had been prepared in accordance with NGL’s arrangements. I judge these documents had been subject to review and approval by competent staff consistent with ONR’s expectations for LC22. I identified some minor areas for improvement to the NGL’s arrangements for control changes to plant spares control, which will be considered by ONR’s Corporate Inspector as part of a fleetwide intervention to evaluate NGL’s arrangements for control change to plant spares. I judged that a Green inspection rating was appropriate against LC22.

Document Control

I reviewed NGL’s arrangements for control of operational documentation and I am satisfied that overall, arrangements are consistent with ONR’s regulatory expectations. Some potential enhancements were identified concerning the definition of responsibilities for implementation and governance at individual sites. These will be considered by ONR’s corporate inspector. I am satisfied that NGL have responded appropriately to observations made during a previous ONR inspection in respect to management of document amendments, initiating an extent of condition review. I will review the progress of improvements during ONR’s next planed LC6 compliance inspection.

Conclusion of Intervention

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