Office for Nuclear Regulation

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Hunterston A site inspection

Executive summary

Purpose of intervention

This report covers interventions carried out as part of ONR’s regulation of operations undertaken at the Magnox Hunterston A (HNA) site.

Interventions Carried Out by ONR

One Systems Based Inspection (SBI) covering Waste Containment and two Compliance Inspections relating to Licence Condition (LC) 24 (Operating Instructions) and LC25 (Operational Records) were undertaken together with an Action/Issue review and a meeting with site Safety Representatives.

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

The licence conditions were inspected against ONR's published guidance requirements, as described in our technical inspection guides, which can be found at Office for Nuclear Regulation (ONR) Compliance inspection - Technical inspection guides. Further information on Integrated Intervention Strategy (IIS) ratings, is available at

Explanation of Judgement if Safety System Not Judged to be Adequate


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

The inspections relating to the SBI found that systems employed on the HNA site for waste containment were adequate although HNA do need to ensure that their Broad Roles have been appropriately reviewed to their own timescales. HNA also need to ensure that spreadsheets used for management purposes are formally configured, controlled and used.

HNA compliance with both LC24 and LC25 was deemed adequate with No Formal Action (Green) required by ONR. However, ONR will revisit HNA under LC17 (Management Systems) in 2017 to ensure that their record retention policy gives due priority to safety.

HNA provided a useful update to the status of commissioning in the Wet Intermediate Level Waste Retrievals and Encapsulation Plant (WILWREP), confirming that due process has been completed regarding active commissioning.

Conclusion of Intervention

The Waste Containment SBI found systems on site to be adequate.

No Formal Action (Green) was the outcome from Compliance Inspections on LC24 and LC25