Office for Nuclear Regulation

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Planned LC22 inspection at AWE Aldermaston

Executive summary

Purpose of Intervention

This report covers a planned inspection at the AWE Aldermaston Licensed Site and was 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 intervention was to undertake an inspection of Licence Condition 22 (LC22), as planned in the weapons inspection plan.

Interventions Carried Out by ONR

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

An inspection was undertaken within Waste & Decommissioning covering Licence Condition 22 (Modification or experiment on existing plant). I met with the licensee's personnel and reviewed modifications raised in the past 12 months within the Waste & Decommissioning areas, and I sampled a number in more detail to inform my view.

Explanation of Judgement if Safety System Not Judged to be Adequate

This was not a systems inspection.

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

I considered the modifications I sampled had been adequately categorised for safety significance under AWE's arrangements. The Asset Change Board (ACB) that reviews modifications (known as ACRs) in the area inspected includes the internal regulator and the safety case manager, as well as plant management. I considered this was an appropriate level of oversight. The number of open modifications was appropriate and being tracked and managed by the ACB.

I found an inconsistency regarding the recording the applicability of the Construction Design & Management (CDM) Regulations in a database for one ACR. All work in the facility is managed as required by CDM and this did not impact how work was controlled. I was satisfied that, from the areas I sampled, there were appropriate measures in place to demonstrate compliance with this licence condition.

Conclusion of Intervention

It is my opinion, based upon the evidence I sampled, that a rating of green was appropriate for licence condition 22.