Office for Nuclear Regulation

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Sizewell B - Outage and Periodic Shutdown - Mechanical Engineering

Executive summary

Purpose of Intervention

The purpose of this intervention was to carry out licence compliance inspections at EDF Energy Nuclear Generation Limited's Sizewell B power station in line with the planned inspection programme contained in the Sizewell B Integrated intervention Strategy for 2017/18.

Interventions Carried Out by ONR

ONR inspectors carried out inspections against the requirements of Licence Condition 28: examination, inspection, maintenance and testing, to inform the ONR decision relating to the issue of a licence instrument for consent for return to service of Sizewell B following its periodic shutdown. The activities examined were selected due to their nuclear safety significance.

The intervention included:

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

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

Based on my sampling, I am satisfied from a mechanical engineering perspective that during the Sizewell B 2017 periodic shutdown:

Conclusion of Intervention

Based on my sampling undertaken as part of this intervention, I am satisfied that the Licence Condition 28 arrangements in place are adequate and have been adequately implemented with no significant shortfalls. I have therefore given this inspection an Integrated Intervention Strategy rating of Green.

I would therefore support a request under Licence Condition 30 to return Sizewell B to operation following its 2017 periodic shutdown.