Record #00492Technology archive
Darlington Nuclear Generating Station Unit 1 in Ontario, Canada, generated power continuously for 1,106 days from 26 January 2018 until a planned outage on 5 February 2021, setting a world record for uninterrupted nuclear-reactor operation.
Current Record
1106days
Current record value
Darlington Unit 1 uses the Canadian CANDU pressurised heavy-water reactor design, which permits fuel replacement while online. Its lengthy run relied on equipment reliability and operating and maintenance planning.
Ontario Power Generation announced on 15 September 2020 that Unit 1 had reached 963 days, surpassing India's previous 962-day Kaiga record. It continued until a scheduled inspection outage on 5 February 2021, concluding its 1,106-day run. The figure applies to one reactor rather than the whole generating station.
The record conclusion has sufficient verification support.
Basis: direct confirmation by an authority
OPG's primary 5 February 2021 release confirms the uninterrupted 1,106-day run since 26 January 2018 and the planned outage on 5 February 2021. Its 2020 release documents surpassing Kaiga's previous 962-day benchmark, and Canada's nuclear regulator confirms the station location. The metric is single-reactor online operation, not whole-station lifetime.
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