Office for Nuclear Regulation

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Sizewell B planned Intervention

Executive summary

Purpose of Intervention

The purpose of this intervention was to undertake Licence Condition (LC) compliance inspections at EDF Energy Nuclear Generation Ltd's (NGL's) Sizewell B power station, in line with the planned inspection programme of the Operating Facilities Operating Reactors sub-programme intervention plan for 2017/18.

Interventions Carried Out by ONR

During this intervention I:

Explanation of Judgement if Safety System Not Judged to be Adequate

No system inspection was undertaken during this intervention.

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

At the time of my visit the first stage of machining affected steam generator welds was nearing completion. Subsequent to this the Barnwood design authority has identified three candidate repair options, all of which necessitate removal of the drain line capability. ONR specialist inspectors are continuing to monitor the output from the company's structural integrity panel.

The station notified me during this visit that an internal personal contamination event in which a contractor received an internal dose when undertaking invasive work on steam generator D. This will be subject to an adverse condition investigation and ONR will receive an INF 1 notification in accordance with arrangements under LC 7.

During my inspection of containment I made the following observations:

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

I consider that, based on the evidence acquired during this intervention, that an inspection rating of Green is appropriate for LC 26 (Control and supervision of operations).