Office for Nuclear Regulation

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Hunterston B - Planned Intervention

Executive summary

Purpose of intervention

The purpose of this intervention was to undertake Licence Condition [LC] compliance inspections at Hunterston B (HNB) power station in line with the planned inspection programme contained in the HNB Integrated Intervention Strategy (IIS).

Interventions Carried Out by ONR

As part of this intervention, we undertook a compliance inspection against licence Condition 7 - Incidents on the site. We also observed elements of the Rapid Trending Review undertaken by a team of Independent Nuclear Assurance [INA] staff from across the EDF fleet as part of early trending for the Reactor 4 statutory outage. During this intervention, other information exchange meetings were undertaken.

Explanation of Judgement if Safety System Not Judged to be Adequate

No safety case informed system based inspection was undertaken during this intervention.

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

The nominated site inspector and two specialist inspectors observed elements of the Rapid Trending Review [RTR], undertaken by INA to establish and redress developing safety trends associated with the Reactor 4 statutory outage. We also used the process to evaluate compliance against NGL's conventional safety arrangements. Overall observations on the Rapid Trending Review process:

We inspected the licensee's arrangements under Licence Condition 7 and the implementation of those arrangements for investigation and analysis of operating experience. Key findings:

The external hazards specialist inspector examined Station's oversight arrangements for the Western Link Project and sought assurance as to the continued validity of the external hazards safety case. There is continued evidence of effective oversight of the principal contractor activities at the Converter Station site. We sought clarity on Station's arrangements for succession planning for key staff involved in managing the Western Link interactions, and also further evidence of external hazards analysis. This will inform a forthcoming meeting between ONR, EDF and the Principal contractors scheduled for November 2014.

The specialist fault studies inspector secured assurance that regulatory issue 452 has been satisfactorily progressed towards closure, anticipated in September 2014. This is a legacy issue that has endured continued delays since it was initially raised in 2010.

Conclusion of Intervention

We judged the licensee to have implemented the fleet arrangements under Licence Condition 7 in an effective manner with specific areas of good practice demonstrated. An IIS Rating of 2 - 'Good Standard' was awarded.

The licence conditions were inspected against ONR's published guidance requirements (as described in our technical inspection guides).