UK Low-Level Waste Disposal Site STIM Project Rail Transport Completed Ahead of Schedule

The Southern Trench Interim Membrane (STIM) project at the UK's Low Level Waste Repository in Cumbria has completed its final aggregate rail deliveries, with related deliveries completed approximately one month ahead of schedule.

Nuclear Waste Services (NWS) is progressing with capping works at the site, implementing long-term management of trenches and vaults used decades ago for the disposal of low-level radioactive waste. The current focus is on replacing the protective membrane above the southern trenches. This membrane reduces rainwater infiltration into the waste areas below, helping to lower environmental risks and creating conditions for the subsequent final capping of the northern trenches.

The STIM project requires substantial quantities of aggregate to be placed on the trench cover. Since the first deliveries in February 2025, approximately 330,000 tonnes of aggregate have been transported to the site's railhead via 365 trains. Compared with road transport, rail deliveries have eliminated approximately 17,368 lorry journeys, reducing pressure on local road traffic and minimizing impacts on nearby communities.

Christine Bradley, Project Delivery Lead at the repository, stated that the rail carrier, Nuclear Transport Solutions (NTS), and supply chain partners prioritized the delivery tasks, and the collaborative efforts enabled the project to be completed safely and ahead of schedule. She noted that every train arrival advanced the final capping work and brought the goal of long-term safe disposal of nuclear waste one step closer.