Office for Nuclear Regulation

Hunterston B Power Station – Planned Inspection

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 2015/16.

Interventions Carried Out by ONR

This intervention included planned compliance inspections against the following specific Licence Condition:

I also met with the station’s independent nuclear assurance [INA] evaluators to discuss recent outage related surveillances and progress towards part B concurrence for return to service of Reactor 3.

Explanation of Judgement if Safety System Not Judged to be Adequate

No system based inspection was undertaken during this intervention.

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

Overall I judged from the three modifications sampled and the records observed that:

In each case there is evidence of appropriate classification of modification with sufficient nuclear safety justification relating to consequences if inadequately conceived or executed;

There is demonstrable alignment and control of planned work to a quality plan, where relevant;

Appropriate handover of completed work from maintenance to operations; where there is outstanding work I was satisfied that the Outage Pre-Recommissioning Work [OPRW] process was an appropriate vehicle for tracking and monitoring;

There is satisfactory evidence that all necessary peer review, verification, and where relevant, independent nuclear safety assessment [INSA] has been undertaken and appropriately documented.

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 have allocated an IIS rating of ‘3– Adequate’ for LC22 – modification or experiment on existing plant, in light of appropriate standard of engineering change documents, categorisation of modifications and demonstrable compliance with company arrangements.

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