Trawsfynydd Reactor Buildings Height Reduction
Magnox Limited
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Key details
Procurement
- 45111100 Demolition work
- 45510000 Hire of cranes with operator
- 45113000 Siteworks
- 45500000 Hire of construction and civil engineering machinery and equipment with operator
- 45262660 Asbestos-removal work
- 45262310 Reinforced-concrete work
- 45262330 Concrete repair work
- 45262300 Concrete work
- 45262100 Scaffolding work
- 45200000 Works for complete or part construction and civil engineering work
- 45111300 Dismantling works
- 45111000 Demolition, site preparation and clearance work
- 45262120 Scaffolding erection work
- 45262110 Scaffolding dismantling work
- 45210000 Building construction work
- 45110000 Building demolition and wrecking work and earthmoving work
- 45000000 Construction work
- 45111200 Site preparation and clearance work
What happened
Magnox Limited awarded this contract to Costain Limited on 2 Oct 2025.
Description
Partial demolition of each Reactor Building, reducing the overall height , together with an extensive package of civil new build and remedial works
See full description and Scope document for further details
Full description
Magnox Ltd. is responsible for the safe and compliant decommissioning of Trawsfynydd Nuclear Power Station in Gwynedd, North Wales. Built in the early 1960’s, the Site ceased generating electricity in 1991 and has been undertaking decommissioning works since.
The next phase of the decommissioning programme will principally feature modification of the two former civil nuclear Reactor Buildings which, in current state, offer safe and secure storage of housed plant. The project will involve the systematic deconstruction and partial demolition of each Reactor Building, delivering a reduced height configuration compliant with existing planning commitments and lessening the visual impact on the landscape. In addition, a package of civil new build and remedial works will be delivered to prolong the durability of the retained structures and reduce disproportionate asset management liability. The end product will offer compliant protection of the stored inventory, ready for successor phases of decommissioning activity on the Site.
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View all →External ID: fts-ocds-h6vhtk-03d00b • Added 20 August 2026