Engineers at an Ontario nuclear power station have reached a major milestone in rebuilding a reactor core, finishing a crucial stage almost a month ahead of schedule.

Bruce Power says its Unit 4 reactor reached the milestone 25 days faster than the previous unit. The team fitted all 480 calandria tubes, which form the heart of the reactor vessel. Work will now begin on installing the fuel channels.

The speed of the work comes at a critical time for Canada’s most populous province. Officials expect electricity demand in Ontario to jump by 90 percent by 2050.

To help meet this need, Bruce Power is also boosting the power output of its existing plant. The company has hired Siemens Energy Canada to supply new high-pressure steam turbines for all four Bruce A reactors. Engineers will install the machinery between 2028 and 2031.

The upgraded turbines will run more efficiently. They will generate an extra 30 megawatts of electricity from each reactor without burning extra fuel. In total, the deal will inject nearly 125 megawatts of extra clean electricity into the provincial grid.

Inside Unit 4, the rapid installation was made possible by advanced automation.

Technicians deployed a state-of-the-art robotic tooling system to seal the reactor components. The machine operates on both faces of the reactor at the same time. It slides an insert into each tube and rolls the metal to an exact diameter. This microscopic cold-working process locks the joint into a permanent, leak-tight seal.

The robotic system removed the need for manual work in hazardous areas.

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