Office for Nuclear Regulation

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Planned intervention at AWE Aldermaston

Executive summary

Purpose of intervention

This report covers planned inspections at the AWE Aldermaston Licensed Site and is undertaken in accordance with ONR’s Integrated Intervention Strategy (IIS) for the Atomic Weapons Establishment Programme.

The inspections undertaken at the Aldermaston Licensed Site form part of a series of planned interventions in accordance with the IIS and Integrated Intervention Plan (IIP). The purpose of the interventions was to undertake an inspection of compliance with Licence Condition (LC) 34, leakage and escape of radioactive material and radioactive waste and a system based inspection as planned in the weapons inspection plan.

Interventions Carried Out by ONR

Licence conditions are inspected against ONR’s published guidance requirements, as described in the 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

ONR conducted a planned inspection and assessment of implementation of the LC 34 arrangements, leakage and escape of radioactive material and radioactive waste. During this intervention I met with the licensees personnel and inspected their compliance with LC 34 within a decommissioning facility. I also completed a system based inspection into the personnel exclusion systems in an X-ray facility.

Explanation of Judgement if Safety System Not Judged to be Adequate

Safety systems were judged to be adequate.

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

The licensee was able to demonstrate appropriate measures are being used to identify and manage any leakage of radioactive materials as required by LC34, even though monitoring information shows this is not a current problem. The system and arrangements used to ensure personnel are excluded from the X-ray facility were considered to be suitable. I was content with what I saw and considered compliance was adequate.

Conclusion of Intervention

Based upon the evidence I sampled during the inspections I judged that there was no need for regulatory action and a rating of green was appropriate for both interventions.