Darlington Nuclear Refurbishment

Rank 2022


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 commencement of the execution phase marks the joint venture’s (JV) successful delivery of the definition phase (2012-2016) of the project, which included the construction of a full-scale reactor mock-up facility to simulate key elements of the refurbishment work and the testing of specialized tooling and to help prepare a comprehensive estimate and schedule for the project. A $35-million reactor vault mock-up and re-tube and feeder replacement (RFR) was completed as part of the preliminary phase of the refurbishment project. Led by SNC Lavalin Nuclear (SLN) and Aecon Nuclear, the mock-up helped to train the team for feeder and fuel channel replacements to be undertaken as part of the overall refurbishment project. The execution phase of the project will involve the replacement of main reactor components using tools and methods that were developed and tested during the project’s definition phase, carried out by the JV. Each of the four Darlington Candu reactors will be taken out of service sequentially for approximately three years to allow for the replacement of fuel channels, feeder pipes, calandria tubes and end fittings. The overall project is scheduled for 112 months. In June 2021, the team completed Bellows severing which marked the completion of Segment 2A on the Unit 3 Refurbishment project. This segment of the project started with opening the Unit 3 airlock doors for the first time since the station began producing power in the 1990s. All interfering components have now temporarily been removed in the vault, making way for the removal of core components and installation of the feeders, which took place over the next few months. The project team is now well-

Project Owner: Ontario Power Generation; Nalcor Energy

Engineer: Wood Group (consulting)

Contractor: Generation: Andritz Hydro Canada, Astaldi Canada, Barnard-Pennecon JV

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

Other Key Players: Transmission: GE Energy (formerly Alstom Grid Canada and Alstom Renewable Power Canada), Andritz Hydro Canada, H.J. O’Connell Construction, Valard ConstructionGE 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 member of WSP)

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

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

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


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