Office for Nuclear Regulation

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Heysham 1 - LC28 Structural Integrity Inspection

Executive summary

Purpose of Intervention

This is a record of an intervention by the Office for Nuclear Regulation (ONR) at Heysham 1 Power Station during the 2018 Reactor 2 periodic shutdown. The purpose was to inspect work by the licensee, EDF Energy Nuclear Generation Limited, to comply with Licence Condition 28 (LC28), examination, inspection, maintenance and testing (EIMT).

Interventions Carried Out by ONR

I met with licensee staff and their contractors to examine compliance with Licence Condition 28. I concentrated on aspects of structural integrity that I judged important to nuclear safety.

I sampled aspects of the inspection programme undertaken during the periodic shutdown on the steam and feed systems and other safety related systems external to the reactor pressure vessel.

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

I found satisfactory progress of planned EIMT by the time of my visit, which was approximately half way through their periodic shutdown. Of 550 components in the programme, 207 were not started, 28 in grinding, 73 in progress, 3 in referral, 18 deleted and 239 complete.

I have of sampled aspects of the following:

I sampled the inspection work that had been undertaken as part of the reactor external inspection programme, reviewing inspections completed and associated results. I was content that the work was progressing effectively, with inspection results sentenced appropriately. Weld and Flow Accelerated Corrosion (FAC) inspections were progressing to programme with no significant issues identified.

I viewed digital images from inspections of several reactor internal components. I consider that due process was being followed. I require adequate justification for why the reduced quality inspection of the lower radial key can be deferred and this will be considered in my assessment report. No other significant findings have been reported relating to the internal inspections to date.

I sampled the operation of the station’s Outage Assessment Panel (OAP) during my visit and by reviewing OAP minutes. I was satisfied that the OAP was following due process and that the inspection results were being reviewed appropriately.

I obtained an update on progress made at the station in relation to their corrosion management programme. I am encouraged that corrosion inspection and remediation work has continued throughout the current outage.

I undertook a plant walk down, accompanied by the OAP Chair and INSA Engineer. I observed a good standard of housekeeping and have recorded no significant adverse findings as a result of my walk down.

I met with the System Engineer to discuss progress on inspection activities associated with the Seawater Systems. The inspections were progressing according to plan with no significant issues identified.

I discussed progress on examinations and inspections undertaken during the periodic shutdown, as required by the Pressure Systems Safety Regulations (PSSR). The PSSR Competent Person confirmed that the examinations were proceeding as planned and that station personnel had been providing effective support to their activities.

Conclusion

Based on evidence sampled, I conclude the licensee has performed adequate EIMT to satisfy LC28. I consider that an inspection rating of green is appropriate, based on ONR guidance.

EIMT work planned by the licensee during the periodic shutdown was not complete by the end of my inspection. I will monitor further progress and provide my judgement regarding return to service in my assessment report.