Office for Nuclear Regulation

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Sizewell B - Statutory Outage - Control and Instrumentation (C&I) Inspection

Executive summary

Purpose of Intervention

This Intervention Report covers a Control and Instrumentation (C&I) inspection performed as part of an ONR Operating Facilities Programme (OFP) intervention applicable to EDF Nuclear Generation Ltd (EDF NGL) during the Refuelling Outage 15 (RO15) at Sizewell B (SZB) Power Station. The main focus of this inspection was to verify that relevant work activities have been carried out in relation to C&I equipment and systems important to safety in order to confirm that it remains fit for its intended purpose at SZB.

Interventions Carried Out by ONR

This inspection was undertaken in support of ONR's 2017 statutory outage inspection programme. The outcome of this inspection, which included a review of progress made in various work items and projects associated with C&I equipment and systems important to safety at SZB, covered EDF NGL's arrangements under Licence Conditions (LC) 12 (duly authorised and other suitably qualified and experienced persons), LC 22 (modification or experiment on existing plant), LC 27 (safety mechanisms, devices and circuits) and LC 28 (examination, inspection, maintenance and testing). The intervention is intended to provide a contribution towards ONR's regulatory decision as to whether a Consent in accordance with LC 30 (periodic shutdown) should be issued to allow SZB to return to normal operating service.

Explanation of Judgement if Safety System Not Judged to be Adequate

No safety system inspection was undertaken, hence this is not applicable.

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

My inspection found that the commitments made in the Sizewell B RO15 Outage Intentions Document for C&I equipment and systems important to nuclear safety have been satisfied for those elements of work complete at the time of the inspection. My inspection of the work activities covered during this intervention has generally found that the workmanship applied was adequate and consistent with the standards expected from C&I suitably qualified and experienced persons (SQEP).

Five actions have been raised during the inspection, as identified within this record, to provide information in respect of scope of functional testing of the primary protection system, an apparent moisture leak in a guardline equipment room, definition of suitably qualified and experienced personnel to undertake certain maintenance activities and information in regard resolving issues on the Polar Crane (two actions). None these actions are required to be completed prior to the return to service of SZB following RO15.

Conclusion of Intervention

From the evidence gathered during this C&I-based intervention, I believe there are no significant matters that may impact on nuclear safety. I have not identified any significant issues in relation to the C&I equipment and systems that should prevent ONR from issuing a Consent to allow SZB to restart

On the basis of my inspections of C&I aspects of the SZB RO15 statutory outage it is recommended that support be given for a Consent to allow SZB to return to normal operating service following successful completion of the planned maintenance activities in accordance with LC30.