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 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 Conditions:

In addition I undertook routine information exchange meetings with the station independent nuclear assurance [INA] evaluators and the portfolio project manager. I also presented to the fleet nuclear safety group peer group, which had convened at Hunterston B, information on ONR’s review of regulation under LC23 for operating reactor stations.

Explanation of Judgement if Safety System Not Judged to be Adequate

There was no systems based inspection undertaken during this intervention.

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

During the Licence Condition 12 inspection I confirmed through appropriate sampling that the station is demonstrably compliant against sampled the company arrangements for management of duly authorised persons [DAPs] in the following areas:

During the Licence Condition 26 inspection I examined the processes and arrangements for control of work in the work execution centre. I judged through sampling the station is compliant with company arrangements and controls work in an effective manner.

I interviewed a range of station personnel and management to understand individual supervisory responsibilities and how effectiveness of supervision is assured through the management chain. I judge there to be a consistent message throughout the station organisation on increased efforts to embed and regiment the use of human performance tools in light of incidents that occurred during 2014. I am assured that, in light of these incidents, the management team has a firm and unified intent to strengthen coaching and reinforcement through the line on a sustainable basis. I further recognise the station’s efforts to lead the other EDF stations in the improvement in use of human performance tools in light of incidents across the fleet.

The incidents that occurred on the station in 2014 indicate the need for enhanced and sustained reinforcement of human performance tools at the workface. I have judged that these incidents warrant an IIS rating of ‘4 - Below Standard’ for Licence Condition 26 – Control and Supervision.   It is however my opinion that in light of the extensive intervention being developed by the station, no regulatory intervention is warranted at this stage to enable the licensee to focus on its successful delivery.

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 allocate IIS ratings of ‘3 – Adequate’ for Licence Condition 12 and ‘4 – Below Standard’ for Licence Condition 26. A Level 3 regulatory issue is proposed to ensure effective tracking for licensee improvements.

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