The Ontario government has initiated construction on Canada’s first new nuclear reactor in over 30 years, marking a significant step forward in the nation’s energy strategy. Located on the north shore of Lake Ontario, the Darlington small modular reactor (SMR) project has officially commenced after the foundation was successfully placed at the bottom of a 35-metre-deep vertical shaft by one of the world’s largest crawler cranes. Weighing in at over 950 tonnes, the foundation is heavier than three Airbus A380 aircraft combined, signalling the scale of this ambitious project.
Countdown Begins
Ontario Power Generation (OPG) has been laying the groundwork for the Darlington SMR for roughly a year, but the official start of construction hinges on the foundation work. Industry standards, as outlined by the International Atomic Energy Agency, dictate that the clock starts ticking once concrete is poured for the reactor building’s base. With a deadline set for completion by the end of 2030, OPG and its partners—including GE Vernova Hitachi Nuclear Energy, Aecon Group Inc., and AtkinsRéalis Group Inc.—have just over four and a half years to connect the reactor to the grid. Once operational, this reactor is expected to generate sufficient electricity to power 300,000 homes, playing a pivotal role in Ontario’s energy future.
The Challenge of Timelines
Nuclear construction projects are notorious for encountering significant delays, much like other large-scale engineering ventures such as high-speed rail or major infrastructure projects. OPG’s commitment to completing the SMR within five years places immense pressure on the team, akin to competing for a gold medal. Currently, approximately 1,500 workers are actively engaged on-site, tasked with erecting the first-ever BWRX-300 reactor, which will include a robust containment structure, a control building housing the main control room, and additional facilities for turbine generation.
The challenges faced by OPG are substantial, especially considering that the last nuclear reactor built in Canada took more than seven years to complete. The Darlington SMR is not just an engineering feat; it’s also a prototype, echoing the complexities seen in the construction of the Douglas Point reactor, which took 8.5 years to complete in the 1960s.
Global Context: A Nuclear Race
The global landscape for nuclear construction is dominated by China, which has seen a significant number of reactors under construction since 2016. However, many of these projects experience their own delays. In contrast, Western countries, including Canada, have struggled to maintain similar momentum, with only six reactors built in the Western Hemisphere over the past 40 years. Delays in projects like the AP1000 reactors in the United States further highlight the difficulties faced by nuclear developers. With the Darlington SMR, OPG aims to break this trend, but historical precedents loom large.
Nuclear projects often falter due to incomplete designs, quality control issues, and management missteps. For instance, construction on the Vogtle units in Georgia was plagued by mismanagement and poorly coordinated work schedules, leading to compounded delays. As OPG embarks on this ambitious project, it must avoid the pitfalls that have plagued its predecessors.
Optimism in Modular Design
Despite the challenges, OPG holds a firm belief in the potential of the BWRX-300 reactor. This model is touted as the simplest boiling water reactor ever designed, benefiting from established American technology. Moreover, OPG plans to leverage modular construction techniques to enhance efficiency. For example, the reactor’s base mat was manufactured off-site in 56 sections, which were subsequently assembled and installed on-site using advanced crane technology. This off-site approach is expected to reduce both construction duration and associated risks.
Additionally, OPG plans to employ an integrated project delivery model that promotes collaboration among stakeholders, aiming to streamline processes and share risks effectively. This approach could be instrumental in mitigating the common issues that lead to delays and budget overruns in nuclear projects.
Why it Matters
The successful completion of the Darlington SMR is not just a matter of technological achievement; it holds profound implications for Ontario’s energy landscape and the future of nuclear power in Canada. With significant investments from both provincial and federal governments, the project stands as a litmus test for the viability of small modular reactors in a global market increasingly focused on rapid, cost-effective energy solutions. If successful, it could pave the way for further nuclear developments and solidify Canada’s position in the energy sector, particularly as the world grapples with the pressing need for sustainable power sources. The stakes are high, and the pressure is palpable, making the Darlington SMR one of the most closely watched nuclear projects in the world today.
