Office for Nuclear Regulation

Atomic Weapons Establishment Aldermaston – Inspection ID: 50423

Executive summary

Date(s) of inspection:

  • April 2023

Aim of inspection

The aim of this intervention was to inspect compliance against the Ionising Radiations Regulations 2017 (IRR17) in the A** facility.

Subject(s) of inspection

  • IRR17 – Rating: GREEN

Key findings, inspector’s opinions and reasons for judgement made

This was a planned inspection of the radiological protection arrangements made and implemented by the Duty Holder (the Atomic Weapons Establishment Plc – AWE) under the Ionising Radiations Regulations 2017 (IRR17) in a former production facility at AWE Aldermaston (now under care and surveillance prior to Post-Operational Clean-out, POCO). The inspection was undertaken as part of the planned intervention strategy for the Operating Facilities Division (OFD) of the Office for Nuclear Regulation (ONR), and carried out in-line with the planned inspection programme contained in the AWE Integrated Intervention Strategy (IIS). The Duty Holder’s radiological protection arrangements and compliance with these arrangements within the former production facility was sampled across a number of representative Regulations within IRR17 and the inspection was conducted via discussions with key Duty Holder personnel, the sampling of Duty Holder records and by a plant walk-down within the former production facility. The conclusion of the inspection was that the Duty Holder has adequate radiological protection arrangements in place, is complying with these arrangements and is hence meeting the legal requirements imposed by IRR17 in the context of its operations conducted within the former production facility.


A compliance inspection against the IRR17 was conducted at AWE in the A** former production Facility. The inspection found that AWE has adequate arrangements for compliance with the requirements of IRR17 relating to regulations 8, 9, 14, 15, 17, 18, 28, 29 and 30 and no further action is required so a RAG rating of Green is assigned to this inspection.