Office for Nuclear Regulation

Heysham 1 – LC28 Mechanical Engineering Inspection

Executive summary

Purpose of Intervention

Site License Condition 30 requires EDF Energy Nuclear Generation Ltd to periodically shutdown each reactor at its nuclear power stations for the purpose of undertaking the examination, inspection, maintenance and testing of items important to safety in accordance with the requirements of the plant maintenance schedule (Site License Condition 28 - Examination, Inspection, Maintenance and Testing).

The purpose of this inspection was to provide regulatory confidence in the examination, inspection, maintenance and testing undertaken/planned to be undertaken on the areas sampled during the statutory outage of Heysham 1 Reactor 2, during July 2018.

Interventions Carried Out by ONR

I selected the following as my sample for inspection:

The proposed scope of my inspection is described in the pre-outage inspection plan [TRIM 2017/461935]

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

I sampled the written instructions used by Energy Nuclear Generation Ltd’s operators to undertake examination, inspection, maintenance and testing and confirmed that suitably qualified and experienced personnel were undertaking those tasks. I also identified that duly authorised persons were providing appropriate supervision and control.

I performed a walkdown and observed the items which had been subjected, or were planned to be subjected to maintenance, and had the opportunity to question employees on their understanding of the written arrangements, and their understanding of how these maintenance activities related to the safety case.

In my opinion, the facility’s arrangements were adequate and showed evidence of the incorporation of operational experience.

Conclusion of Intervention

After examining the evidence sampled during my inspection, performing a walkdown, and having discussions with various System Engineers, I judge that there are adequate arrangements in place for Examination, Inspection, Maintenance and Testing, and that they are being implemented appropriately to meet Regulatory Expectations.

There are no findings from this inspection that could significantly undermine nuclear safety, and my intervention has not identified any issues which would prevent ONR granting Consent for Heysham 1, Reactor 2 to return to service.

It is my judgement, therefore, that a rating of Green is appropriate for this inspection.