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The nuclear accidents we don’t hear about – Chalk River Ontario

5 Unknown Nuclear Disasters: Chernobyl Is Far from the Only One, Chernobyl is not the world’s only nuclear disaster, there are plenty of others to keep you up at night., Interesting Engineering, By  

Chalk River Ontario, Canada Incident

On December 12, 1952, there was a power excursion and partial loss of coolant in the NRX reactor at the Chalk River nuclear laboratories. Because of mechanical problems, the control rods couldn’t be lowered into the core, and the fuel rods overheated, resulting in a meltdown of the core.

Just like at Chernobyl, hydrogen gas caused an explosion that blew off the multi-ton reactor vessel seal. Also like at Chernobyl, 4,500 tons of radioactive water was found in the basement of the Chalk River reactor building.  During the accident, 10,000 curies or 370 TBq of radioactive material was released into the atmosphere.

Future U.S. president Jimmy Carter, then a U.S. Navy officer, led a team of 13 U.S. Navy volunteers who helped in the cleanup of this disaster.

On the International Nuclear Event Scale, Chalk River is a 5, along with Goiânia, Three Mile Island, and Windscale.

August 3, 2019 - Posted by | Canada, incidents, Reference

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