The high-stakes gamble of keeping aging nuclear reactors online
In short: Nuclear power is a marathon of maintenance. At the Pickering station, the struggle to keep reactors running has sparked a decades-long debate over safety, massive cost overruns, and the technical limits of 20th-century engineering. It is a masterclass in the complexities of industrial longevity.
The Pickering Nuclear Generating Station, located on Lake Ontario, is one of the world's oldest nuclear facilities. Constructed in stages between 1965 and 1986, it consists of eight CANDU reactors divided into two groups: Pickering A (Units 1–4) and Pickering B (Units 5–8). While the site was once a beach, it now produces about 11% of Ontario's power, employing 3,000 workers. The facility's operational history is marked by significant technical hurdles, including a 1983 incident where a pressure tube split in Unit 2 due to sagging, and a 1994 loss of coolant accident, which is considered the most serious in Canadian history.
The management of these reactors has been fraught with controversy. In 1997, Ontario Hydro shut down the Pickering A reactors for safety reasons after the AECB deemed their 'moderator dump' shutdown system too slow compared to newer 'poison injection' systems. The subsequent effort to refit and restart these units became a symbol of industrial mismanagement. For instance, Unit 4 was slated to cost $460 million but ultimately cost $1.25 billion. While Unit 1 was eventually returned to service in 2005, the project faced intense scrutiny over budget overruns and management failures, leading to the firing of top OPG executives in 2003.
Today, the station sits at a crossroads. As of late 2024, the Pickering A units have been decommissioned. However, the Ontario government recently announced a major investment to refurbish the Pickering B reactors, which date back to the early 1980s. This refurbishment, expected to be complete by the mid-2030s, aims to extend the plant's life by at least 30 years. This move is justified by the need for base load electricity and the goal of reducing carbon dioxide emissions by 2.1 megatonnes in 2026, highlighting the ongoing tension between maintaining aging infrastructure and ensuring modern safety standards.
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- Summary by Intellect · source: Pickering Nuclear Generating Station
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