The pressurized heavy water reactor (PHWR) at Kaiga in Karnataka has become the world's longest running reactor without a shutdown.
The indigenously designed Kaiga-1 unit has been under continuous operation from May 13, 2016, completed a continuous run of 941 days.
The earlier record of 940 days of continuous operation was held by a British reactor called Heysham-2, Unit-8 reactor, which set the benchmark in 2016.
In October, the unit set a new world record for continuous operation of a PHWR (When it completed its 895th day of continuous operation).
The previous record for a PHWR was set in 1994 by Canada's Pickering unit 7, with an unbroken run of 894 days' operation.