System operational · UK tenders
Awarded
ocds-h6vhtk-0389bb · award

Trawsfynydd Reactor Buildings Height Reduction

Nuclear Restoration Services Limited

Estimated Value

Up to £71,813,292

Deadline

Not specified

Published

7 October 2025

Type

works

GBselectiveCPV: 45111100
CategoryConstruction

Overview

Partial demolition of the two reactor buildings, reducing their overall height , together with an extensive package of civil new build and remedial works. NRS 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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Award Details

Costain Limited

£71,813,292

Likely incumbents

Suppliers who won similar work from this buyer in the last 5 years.

5 found
  1. 1

    Celadon Alliance

    2 contracts wonlatest 19 Mar 2026

    £2m

    total awarded

  2. 2

    Aureos Highways

    2 contracts wonlatest 19 Mar 2026

    £1m

    total awarded

  3. 3

    Costain Limited.

    1 contract wonlatest 19 Mar 2026

    £1

    total awarded

  4. 4

    Nuvia Limited

    1 contract wonlatest 19 Mar 2026

    £1

    total awarded

  5. 5

    KAEFER LIMITED

    1 contract wonlatest 19 Mar 2026

    £1

    total awarded

Celadon Alliance is the most likely incumbent based on recency and category match. To win, bidders typically need a clearly differentiated proposition or a price advantage.

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Gladstone & Co AccountantsTax advisers · East Ham, London

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Buyer Profile

Nuclear Restoration Services Limited
Typepublic body
RegionWales
Total tenders456
Total spend£507,369,482
View buyer profile

Key Dates

Published

7 October 2025

Submission deadline

Not specified

Notice type

award

Source

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