Office for Nuclear Regulation

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EDF Energy - Nuclear Generation Ltd - Hunterston B planned Intervention

Executive summary

Purpose of intervention

The purpose of this intervention was to undertake Licence Condition [LC] compliance inspections at EDF Energy Nuclear Generation Ltd’s [NGL’s] Hunterston B power station, in line with the planned inspection programme contained in the Hunterston B Integrated Intervention Strategy [IIS] for 2015/16.

Interventions Carried Out by ONR

This intervention included planned compliance inspections against the following specific Licence Condition:

Licence Condition 30 – periodic shutdown.

We attended the start-up meeting for Reactor 3 currently shutdown for its statutory outage; this was preceded by a walkdown of various work-faces. We reviewed the station’s progress against planned maintenance schedule activities and other plant modifications, with particular focus on the results of graphite core and in-vessel inspections.

Explanation of Judgement if Safety System Not Judged to be Adequate

No system based inspection was undertaken during this intervention.

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

During the pre-start-up meeting plant walkdown we made the following observations:

Summary observations from the start-up meeting are listed below:

We undertook discussions with the station on aspects relating to the return to service safety case. At the time of writing these discussions are ongoing in order to inform ONR’s consideration of an application for consent to return to service.

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

I have allocated an IIS rating of ‘2 – Good Standard’ for LC30 – Periodic Shutdown, in light of a generally well-executed statutory outage, minimal deviation in scope and so far a good safety record.

There are no findings from this inspection that could significantly undermine nuclear safety and, at present, no additional regulatory action is needed over and above the planned interventions of Hunterston B power station as set out in the Integrated Intervention Strategy, which will continue as planned.