Nuclear Decomissioning and Remediation

Amentum brings decades of experience to decommissioning and cleanup, drawn from our work at the world’s most challenging nuclear sites including Sellafield, Fukushima and Chornobyl.

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We tackle our client’s biggest challenges and help transform contaminated sites into safe environments for future generations. We help asset owners manage the cultural and mindset shifts required to move from operations to decommissioning. We bring practical, technically and commercially innovative strategies to address the decontamination, dismantling, deactivation and demolition of high-hazard plants and sites. By adopting a waste-informed approach, underpinned by unrivalled expertise in radioactive material characterisation, shielding and containment we minimize handling and storage costs. In continental Europe, we manage key hazard reduction projects at Chornobyl, Ukraine and Ignalina, Lithuania, and in Slovakia we played a major role in the first ever dismantling of a Soviet-designed VVER-440 reactor.

Key Projects


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  • Decommissioning

    Amentum brings decades of experience to the task of cleaning up the nuclear legacy, drawn from our work at the world’s most complex sites.    Underpinned by our research and development base, practical technology and an unrelenting safety ethos we bring practical, cost-effective solutions that are both technically and commercially innovative.    Our global Tier 1 experience…

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  • Engineering, Installing, and Managing Innovative Solutions

    The decommissioning programme at the UK’s Sellafield nuclear site has been ranked alongside building the Channel Tunnel between England and France in terms of scale and organisational complexity.   To respond to this challenge, site licence company Sellafield Ltd inaugurated the Programme and Project Partnership (PPP), an alliance between itself and four suppliers based on long-term…

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  • Radioactive Waste Management and Radiation Protection

    Expertise in safety case management, environmental and radiological consultancy, and health physics are combined with our core engineering and materials science capabilities to deliver an unrelenting safety ethos in the management of radioactive waste.   We apply strategies to minimize waste volumes requiring final disposal and we implement innovative decommissioning and decontamination processes for clients around…

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  • Monju

    Amentum and Cavendish Nuclear are working together to assist the decommissioning of the Monju Prototype Fast Reactor (PFR) in Fukui Prefecture, Japan.  Under a contract from the Japan Atomic Energy Agency (JAEA), the two companies are constructing a facility in the UK to treat sodium coolant material removed from the reactor. The end product, sodium…

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  • Fukushima – TEPCO

    In March 2011, an earthquake and tsunami caused the world’s second most severe nuclear accident at the Fukushima Daiichi nuclear power plant, with meltdowns in three of the four reactors, hydrogen explosions and the release of radioactive material.  Amentum has been working at Fukushima since 2016, supporting Tokyo Electric Power Company (TEPCO) with program and…

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  • Bohunice Reactor Dismantling

    Amentum took part in a pioneering project to clean up Slovakia’s nuclear legacy.  JAVYS, the nation’s decommissioning company, tasked a consortium of Westinghouse Electric Company and VUJE with the first ever dismantling of a VVER-440 nuclear reactor at the Jaslovské Bohunice V1 nuclear power plant.   As waste management subcontractor, Amentum designed and manufactured remotely operated…

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  • Dalgety Bay Clean-Up

    Amentum’s radiation protection specialists supplied the crucial know-how for a clean-up operation on Scotland’s most radioactive beach.  Radioactive residues were first detected on the foreshore of Dalgety Bay, near Dunfermline, in 1990, not far from a former airfield where radium-coated ‘glow in the dark’ aircraft dials and instruments were incinerated and landfilled at the end…

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    End State Contract for Dounreay Site Restoraton Ltd, UK

    Amentum was a part of a consortium who were awarded the End State contract by Dounreay Site Restoration Ltd in 2012. The contract included clean-up and demolition of the UK’s former fast reactor research and development centre, decommissioning of 35 separate but integrated projects – all designed to reduce site environmental risk to acceptable levels…

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    Management & Operations of LLW Repository Ltd (LLWR), UK

    Amentum was the majority partner of the consortium responsible for the management and operation of the Low Level Waste Repository (LLWR) in West Cumbria, UK and the development and implementation of the National Low Level Waste Programme. LLWR is the national facility for the disposal of low level radioactive waste in the UK. Upon contract…

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    Decommissioning Plutonium Contaminated Material Facilities at the LLWR, UK

    Amentum managed the successful delivery of the Plutonium Contaminated Material (PCM) Decommissioning Programme at the Low Level Waste Repository site (LLWR), including the decommissioning and demolition of five contaminated magazines and seven support facilities. The programme was undertaken from 2013 to 2019 and was valued at £100 million. The magazines held PCM generated from operations…

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