Darlington Refurbishment Project – Definition Phase

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Image Credit: SNC-Lavalin

Ranking for 2015: 17

Industry Sector: Energy

Specific Sector: Nuclear

Range: $1 billion - $5 billion

Project Value: $2,700,000,000

Government Funds Involved: N/A

Funding Source: Public

Location: Clarington, Ontario

Estimated End Date of Substantial Completion: 2016


The Darlington generating station consists of four reactors with the total output power of 3,512 MW. Refurbishment involves the replacement of core reactor components to enable the plant to operate until 2055. Each reactor is taken out of service for about three years to allow for the replacement of fuel channels, feeder pipes, calandria tubes, and end fittings; rehabilitation of steam generators, turbines, generators, and fuel handing equipment; and system improvements and plant upgrades to meet current regulatory requirements.

More than 450 unique tools have been developed and delivered to undertake the refurbishments. A full scale, non- functioning reactor mock-up was completed in March 2014, and detailed engineering design was completed in August 2015, a year before construction is to start. Starting in 2015, the mock- ups have been used for tool testing and will be used to train the trainers, trades, and management to prepare for execution on the first unit scheduled for refurbishment (Unit 2).

Execution of the first unit will begin in October 2016. The reactors will each be refurbished with planned outage. Unit 2 will be refurbished from 2016 to 2019, Unit 1 will be refurbished from 2019 to 2022, Unit 3 will be refurbished from 2021 to 2024, and Unit 4 will be refurbished from 2022 to 2025.

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