Office for Nuclear Regulation

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Heysham 1 Reactor 1 Boiler Spine 1D1 Level 4: In-vessel Inspection Readiness

Executive summary

Purpose of intervention

Heysham 1 Reactor 1 will begin a refuelling outage in June 2014. This outage will be extended to allow the Licensee, EdF Energy Nuclear Generation Limited (NGL), to conduct a series of detailed inspections in and around weld 12.3 on boiler spine 1D1. These inspections seek to provide further insight into the cause of the anomalous inspection result during the 2013 outage and are part of a boiler spine inspection programme. The inspections will be conducted in two phases. The first phase of inspections will be deployed through a TV inspection aperture in the Boiler Closure Unit. Remote viewing, Eddy current inspection and radiography will be performed on a narrow strip section of the spine in the region of weld 12.3. Phase 2 will involve manned vessel-entry inspections using a variety of techniques including ultrasonic testing, Eddy current testing and further radiography. The Phase 2 inspections will be more detailed and survey a larger area of the spine circumference than in Phase 1.

Purpose of Intervention

The purpose of the intervention was to meet with NGL and discuss the current state of readiness of the boiler spine inspection work streams prior to commencement.

Interventions Carried Out by ONR

A level 4 meeting was held between the Licensee and inspectors from the Office for Nuclear Regulation to discuss the readiness of Heysham 1 reactor 1 1D1 boiler spine inspection work streams prior to commencement.

Explanation of Judgement if Safety System Not Judged to be Adequate

N/A.

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

Conclusion of Intervention

The meeting was an adepquate exchange of information providing sufficient detail for ONR inspectors to understand the current position of the boiler spine inspection programme. I have given the intervention an IIS rating of 3, adequate, no regulatory issues arose from the meeting.