Office for Nuclear Regulation

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] Hunterston B power station, in line with the planned inspection programme contained in the Hunterston B Integrated Intervention Strategy [IIS] for 2014/15.

Interventions Carried Out by ONR

This intervention included compliance inspections against the following Licence Condition:

LC11 – Emergency Arrangements

The intervention was undertaken by four ONR inspectors and involved the annual Level 1 demonstration [Exercise ‘Ness’] of the on-site emergency response arrangements at the Hunterston B nuclear licensed site, in compliance with the requirements of LC11(5). The purpose was to seek assurance that the licensee’s emergency arrangements and its emergency response personnel have the capability to deal effectively with emergencies leading to onsite or offsite consequences.

In addition, the nominated site inspector undertook an initial meeting with NGL’s Technical Specification steering committee to discuss ONR’s review of regulation of LC23 operating rules on NGL licensed sites. This was a preparatory meeting to develop a framework for further interaction with the licensee.

Explanation of Judgement if Safety System Not Judged to be Adequate

There was no system based inspection undertaken during this intervention.

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

Prior to the intervention, NGL provided details of the exercise scenario and provided a pre-brief that captured the work undertaken over the previous year as well as an overview of the exercise objectives,

During the course of the exercise a number of opportunities for improvement were identified. ONR also identified one higher priority area for improvement that will require specific follow-up with the station during the next 12 months through Licence Condition 11 compliance inspection and a further element of demonstration.  ONR will write to NGL requesting confirmation of the action proposed, or already taken, to address the points raised by ONR, together with those of their own staff and the independent assessment team. The Hunterston B nominated site inspector is to be advised of future shift exercises intended to test the implementation of those areas and opportunities for improvement.

ONR welcomed the fact that the joint debrief meeting provided a comprehensive exchange of information on the outcome from the exercise.

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

The ONR team deemed that Exercise ‘Ness’ provided an adequate demonstration of the station emergency arrangements for the current year and that the station responded well to the scenario. This inspection has been allocated an IIS rating as ‘3 – Adequate’.