Darlington Nuclear Refurbishment

Rank 2024


Image Credit: Ontario Power Generation

Industry Sector: Energy

Project Type: Nuclear

Project Value: $12.8 billion

Funding Source: Public

Provincial Funding: $12.8 billion

Province: Ontario

City / Region: Clarington

Estimated End Date of Substantial Completion: 2026

The Darlington Nuclear Refurbishment Project was managed in three distinct phases: Initiation Phase (2007 – 2009); Definition Phase (2010-2015); and Execution Phase (2016-2026). During the execution phase of the project, workers will remove, inspect, and install main reactor components using tools and methods that were developed and tested during the Project’s definition phase, carried out by CanAtom. OPG removes each of the four Darlington CANDU reactors from service sequentially for approximately three years each to allow for the replacement of feeder tubes, end fittings, pressure tubes and calandria tubes. The overall refurbishment project is 20 years in duration, with the execution phase scheduled for 112 months. 

Project Owner: Ontario Power Generation; Nalcor Energy

Engineer: Wood E&I (WSP) (consulting)

Contractor: Generation: Andritz Hydro Canada, Astaldi Canada, Barnard-Pennecon JV Transmission: GE Energy (formerly Alstom Grid Canada and Alstom Renewable Power Canada), Andritz Hydro Canada, H.J. O’Connell Construction, Valard Construction; Bird Construction

Project/Construction Manager: Aecon Group Inc./ AtkinsRéalis JV (execution phase of the retube and feeder replacement)

Other Key Players: E.S. Fox; GE Power; ABB; Amec Foster Wheeler; Deloitte; Kiewit; Black & McDonald; Tetra Tech; BDI Canada; Burns & McDonnell/Modus (Independant Project Oversight); Cameco (calandria tubes and annulus spacers); Alstom AA6Power & Transport Canada Inc. (turbine generator refurbishment); Hatch (engineering services); Armtec; Comtech (Project Control Consultant Services); Golder-a WSP company (geotechnical services/environmental engineering); Dillon Consulting

Supplier Other: DECAST Ltd.; Laker Energy (nuclear components); Nu-Tech Precision Metals (calandria tubes)

Legal: Blake, Cassels & Graydon; Torys (acting for the owner)

2023 Rank: 4

2022 Rank: 4

2021 Rank: 3

2020 Rank: 3

2019 Rank: 2

2018 Rank: 2

2017 Rank: 2

2016 Rank: 15

2015 Rank: 17

2014 Rank: 74