Office for Nuclear Regulation

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Hunterston B - LC11 - Level 1 Demonstration Exercise

Executive summary

Purpose of Intervention

This was a planned inspection of EDF Energy Nuclear Generation Ltd.’s (NGL’s) Hunterston B Power Station, undertaken as part of the planned intervention strategy for the Operating Facilities Division (OFD) of the Office for Nuclear Regulation (ONR).

The work was carried out in accord with the planned inspection programme contained in the Hunterston B Integrated Intervention Strategy (IIS) for 2018/19.

Interventions Carried Out by ONR

As part of this intervention I, the nominated site inspector supported by a team of ONR inspectors carried out an inspection against:

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

Explanation of Judgement if Safety System Not Judged to be Adequate

No system based inspection was undertaken hence, this is not applicable for this intervention.

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

Licence Condition 11 (Emergency arrangements) – The ONR inspection team assessed the Level 1 demonstration exercise ‘Balmoral’ that sought to demonstrate the adequacy of emergency plans prepared under LC 11.

The exercise scenario involved a release of nuclear material resulting in declaration of an off-site nuclear emergency coupled with a demonstration of the relocation of the command and control of the emergency to alternative emergency centres due to a seismic event.

The demonstration of command and control during the exercise was adequate and the relocation of exercise command to alternate emergency control centres and the subsequent control of the event were demonstrated successfully.

ONR noted the positive behaviours demonstrated by the exercise players and Emergency Arrangements Review Team (EART), which enabled EDF to critically review its own performance in order to identify those areas of strength as well as the learning opportunities.

The principle learning opportunity identified during exercise was on the need to improve clarity of the command and control focuses leading to SMARTer actions, which may have led to improved performance in some areas.

The other identified learning opportunities will be communicated to the station by separate letter and tracked to completion by the site inspector through normal business.  

The exercise was judged to be an adequate demonstration of the emergency arrangements.  We therefore assigned a rating of Green (no formal action) for LC11.

Conclusion of Intervention

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