Office for Nuclear Regulation

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Hunterston A inspection week

Executive summary

Purpose of Intervention

This inspection was carried out as one of a series of planned inspections of operations undertaken at the Magnox Ltd Hunterston A (HNA) site.

Interventions Carried Out by ONR

Compliance Inspections relating to Licence Condition (LC) 6 (Documents, records, authorities and certificates), LC17 (Management systems), LC25 (Operational records), LC10 (Training) and LC12 (Duly authorised and other suitably qualified and experienced persons) were undertaken. A Systems Based Inspection (SBI) on the Wet Intermediate Level Waste Retrieval and Encapsulation Plant (WILWREP) was undertaken. Other meetings included an Action/Issue review, a meeting with Site Safety Representatives and a meeting to discuss LC14 (Safety documentation) compliance.

Explanation of Judgement if Safety System Not Judged to be Adequate


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

The SBI on WILWREP identified no matters of concern for the site. I questioned plant labelling of Safety Mechanisms, Devices and Circuits (SMDC) during a previous inspection at HNA and was pleased that the site had followed up on this enquiry. I established that corporate guidance is that no distinct labels should be used (although Tags are used).

I found HNA site to be complying with it arrangements under LC6, LC10, LC12 and LC25.

I found HNA site to be complying with its arrangements under LC17. However, I consider that the recent rollout of the SharePoint and Q-Pulse systems has not been appropriately impact-assessed.

I observed that good progress appeared to be being made on actions previously placed on site under LC10 and LC12. I asked that HNA consider what might be done to formalise their review process for Duly Authorised Persons and will seek their views during my next site visit.

I discussed the Magnox application of their arrangements under LC14 following a previous site inspection and consider that there is a potential shortfall against ALARP assessment.

Conclusion of Intervention

I conclude that WILWREP adequately fulfils the requirements of the Safety Case.

I consider that no formal action is required of HNA following compliance inspections covering LC6, LC10, LC12, LC17 and LC25.

I shall seek ONR specialist guidance on relevant good practice for the labelling of SMDC and Magnox Ltd's approach to ALARP assessment to inform future interactions.