Office for Nuclear Regulation

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R3 Outage Inspection - C & I

Executive summary

Purpose of intervention

This intervention report covers our control and instrumentation (C&I) inspection performed as part of an ONR Civil Nuclear Reactor Programme (CNRP) intervention applicable to EDF Energy Nuclear Generation Ltd (EDF NGL) during the 2016 statutory outage of Reactor 3 (R3) at Hinkley Point B (HPB) Power Station. The main focus of our 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 they remain fit for their intended purpose at HPB.

Interventions Carried Out by ONR

Our inspection was in support of ONR’s 2015/16 statutory outage inspection programme. The outcome of our inspection, which included a review of progress made regarding various work items and projects associated with C&I equipment and systems important to safety at HPB, covered EDF NGL’s arrangements under Licence Condition LC28 (Examination, inspection, maintenance and testing). Our inspection is intended to provide a contribution towards ONR’s regulatory decision as to whether a Consent in accordance with LC30 (Periodic shutdown) should be issued to allow R3 at HPB to return to normal operating service.

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable.

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

This inspection has found that the commitments made in the HPB R3 Outage Intentions Document (OID) for C&I equipment and systems important to nuclear safety have been satisfied.

We have raised three actions during the inspection, one of which requires resolution prior to return to service of Reactor 3. All three actions have been captured within the ONR Issues Database.

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

On the basis of our inspection of the C&I aspects of the HPB R3 outage, we recommend that support be given for a Consent to allow R3 at HPB to return to normal operating service pending the satisfactory resolution of the one return to service action contained within Issue 2.

Based on the findings of our inspection, we have assigned an integrated intervention strategy (IIS) rating of 4 (below standard) to LC 28. As a consequence of the identification of a computer connected to an instrumentation cabinet for maintenance purposes that had not been through the IT registration and antivirus scanning checks. This highlighted specific procedural weakness. Whilst station is taking this event seriously we considered that an IIS rating of 4 (below standard) is appropriate for compliance against LC28 in this instance.