Reactor Buildings Height Reduction (EXECUTION phase)

Nuclear Restoration Services Ltd · awarded 2 October 2025 · delivered in Wales

Who

Buyer	Nuclear Restoration Services Ltd Trawsfynydd
Supplier	Costain Limited
Category	works
Classification	Hire of cranes with operator CPV 45510000
Notice published	7 October 2025

What it is for

The existing Reactor Buildings at Trawsfynydd are now life expired and require works to mitigate against further degradation, thus ensuring they remain safe and compliant for subsequent decommissioning activities. In addition there are long term commitments through the Town and Country Planning process to reduce the visual impact the buildings currently have on the landscape within the Snowdonia National Park. The Height Reduction project has therefore been implemented with the objective of reducing the height of both reactor buildings such that they are left in a safe and stable configuration for the next phase of works to decommission the Trawsfynydd site whilst significantly reducing ongoing asset investment demands. The reduction in height will also satisfy the requirements to lessen the visual impact the current full height buildings have within the Snowdonia National Park.

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