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On Dec. 12, 1952, the world witnessed its first-ever nuclear reactor accident at Chalk River Laboratories right here in Ontario. Located roughly 180 kilometres northwest of Ottawa, Chalk River was a cutting-edge nuclear research facility. The incident, which occurred with the National Research Experimental (NRX) Reactor, was caused by a combination of mechanical problems and operator error, which led to overheating fuel rods and significant damage to the reactor core. On that fateful date, at approximately 3 p.m., the last experiment of the day was about to begin. The cooling system was modified, and the water flow to the reactor…

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