Office for Nuclear Regulation

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Licence Condition compliance inspection at Hunterston B

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 2016/17.

Interventions Carried Out by ONR

This intervention included compliance inspections against the following Licence Conditions:

I also participated in Level 2 Emergency Exercise Kestrel, in my capacity as nominated site inspector at the station Emergency Control Centre (ECC). This was a demonstration of the local authority’s offsite emergency arrangements. A separate contact record will be developed by the ONR emergency preparedness and response team.

I also undertook a monthly review of safety with the station’s Independent Nuclear Assurance evaluators.

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable as no system inspection was undertaken during this intervention.

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

I undertook a planned intervention against LC 34, during which I:

The station has made some progress in addressing the issues raised from the previous inspection. The material condition of ventilation extract plant is moderately improved, with clear evidence of plans to effect longer term repairs in 2017. The station has not yet addressed the shortfall in maintenance testing for the CCR ventilation extract dampers but has committed to address this by 30 September 2016.

This intervention was performed in line with ONR’s guidance requirements (as described in our technical inspection guides in the areas inspected.

Conclusion of Intervention

In relation to LC 34, I considered that an inspection rating of ‘Green’ is warranted on the basis that the overall condition of the R4 pilecap ventilation extract facility has improved moderately since the 2015 compliance inspection; there appear to be appropriate action requests in place to ensure the underlying roof leak is addressed in the Reactor 4 outage scheduled in September 2017.

There are no findings from this inspection that could significantly undermine nuclear safety.