Sellafield Ltd is the site licence company overseeing the decommissioning of the UK's Sellafield nuclear site in Cumbria — the world's most complex nuclear decommissioning project. In May 2026 Sellafield awarded £2.9 billion in infrastructure contracts to three companies including Amentum. While primarily a decommissioning organisation, Sellafield's massive workforce, nuclear expertise, and Cumbrian location create important supply chain and skills synergies with the broader UK SMR programme.
UK Government (Nuclear Decommissioning Authority)