Plutonium at Sellafield
Posted: 21st May 2025
Flagship Sellafield project seals major milestone. Plutonium treatment plant moves a step closer to completion. The Sellafield Product and Residue Store Retreatment Plant (SRP) is one of our largest and most complex construction projects. When finished it will play an essential role in managing the UK’s plutonium stockpile. The project celebrated an important milestone this week as its roof was sealed with a final concrete pour, making the main building watertight and ready for internal fit-out. Once operational, the plant will retreat and repackage existing material into more durable, long-term storage packages, ensuring they can be safely stored into the next century and beyond. The project is being delivered under Sellafield’s Programme and Project Partners (PPP) infrastructure delivery model which brings together KBR, Amentum, Morgan Sindall Infrastructure, Altrad Babcock, and a wider supply chain, to deliver a 20-year pipeline of major infrastructure projects. Completing the vast roof slab required 12 weeks of work and over 2,700 cubic metres of concrete to be poured and pumped to heights up to 30 metres.