en.Wedoany.com Reported - Canada's Bruce Unit 3 successfully connected to the Ontario grid at 1:34 a.m. on June 2, becoming the unit at Bruce Nuclear Power Station to resume operation after completing a major component replacement (MCR) refurbishment.

On June 2, Ramzi Jammal, Executive Vice President of the Canadian Nuclear Safety Commission (CNSC), notified Bruce Power that, after confirming the company had fulfilled all commitments and continued to comply with license conditions, the regulator decided to lift the final regulatory hold point for the unit's refurbishment project. Maggie Thieman, Director of Community and External Affairs at Bruce Power, stated that the next steps involve increasing the unit's power output and completing the remaining tests and approvals required for commercial operation.

Major component replacement involves removing and replacing key reactor components such as steam generators, pressure tubes, calandria tubes, and feeder tubes, extending the reactor's operational life by 30 to 35 years. Bruce Unit 3 was shut down in March 2023 for MCR maintenance, with the construction phase completed in February this year. The CNSC established four regulatory hold points for the project: loading fuel, lifting guaranteed shutdown state and startup, exceeding 1% of full power, and exceeding 35% of full power.

The Bruce Nuclear Power Station houses eight CANDU reactors, divided into two stations, A and B. Units 1 and 2 of Station A completed refurbishment and resumed operation in 2012, while the MCR overhaul of Unit 4 began in February 2025. The MCR for Unit 6 of Station B was completed in 2024, with Unit 5 expected to begin its overhaul later this year. The MCR projects for Units 7 and 8 are planned for 2028 and 2030, respectively.

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