Trawsfynydd - decommissioning

£70m contract will see deconstruction and height reduction of nuclear

reactors at Trawsfynydd nuclear power station. Costain, the infrastructure
solutions company, has been selected by Nuclear Restoration Services (NRS)
to deliver a decommissioning project at the Trawsfynydd nuclear power
station located in the Snowdonia National Park in North Wales. Costain’s
in-house engineering team will work with NRS to support the safe and
compliant decommissioning of the reactor buildings, which were built in the
1960s and have been subject to decommissioning works since 1991. The
project is worth approximately £70m to Costain, and the programme is
expected to take around four years. At its peak, Costain is expected to
employ more than 100 people to deliver the programme, creating
opportunities to boost regional prosperity through skills development and a
lasting contribution to the local economy. Costain will manage the
deconstruction and partial reduction in the height of the power station’s
two reactor buildings from approximately 54m to 25m, lessening their visual
impact to local communities. Costain will also deliver civils and remedial
works to ensure that the buildings are in a safe and stable configuration
for the commencement of subsequent decommissioning activity on the site.

 Costain 7th Oct 2025

 https://www.costain.com/media/press-releases/2025/costain-selected-for-complex-nuclear-decommissioning-contract-in-north-wales/

 New Civil Engineer 7th Oct 2025

 https://www.newcivilengineer.com/latest/costain-wins-70m-contract-to-reduce-height-of-trawsfynydd-reactor-buildings-07-10-2025/