Office for Nuclear Regulation

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Heysham 1 Planned Intervention

Executive summary

Purpose of intervention

The purpose of this intervention was to undertake a licence condition compliance inspection at EDF Nuclear Generation Limited’s (NGL’s) Heysham 1 power station in line with the planned inspection programme contained in the Heysham 1 Integrated Intervention Strategy (IIS) for 2014/15.

A meeting was also held with the station internal regulator.

The inspections were undertaken by the nominated ONR Site Inspector.

Interventions Carried Out by ONR

The key intervention undertaken by the nominated site inspector was a Licence Condition (LC) 22 compliance inspection which targeted implementation of the recent changes to the company LC22 compliance documentation.

The meeting with the internal regulator was a routine meeting to discuss progress with previously raised issues, any new issues and future interventions.

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

I sampled a number of recent LC22 modifications including those produced to justify the return to service of both reactors following the boiler spine issue.  I also sampled a lower category modification which had been challenged by the internal regulator.  In each case I was presented with evidence that demonstrated that the station had adequately implemented the revised LC22 procedures. On this basis I have judged compliance with LC22 to be adequate with an IIS rating of 3. 

I also reviewed progress with two minor issues raised previously during the last LC22 compliance inspection and was provided with sufficient evidence for me to deem these issues closed.  No further issues were raised as a result of this intervention.

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

From the evidence gathered during this intervention, I do not consider there to be any matters that have the potential to impact significantly on nuclear safety.   In addition sufficient evidence has been provided to close two minor issues raised during the last LC22 compliance inspection.  At present, no additional regulatory action is needed over and above the planned interventions of Heysham 1 power station as set out in the Integrated Intervention Strategy, which will continue as planned.