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So, How Hot Was It? via The New York Times

It was so hot  last week, a twin-unit nuclear plant in northeastern Illinois had to get special permission to continue operating after the temperature of the water in its cooling pond rose to 102 degrees.

It was the second such request from the plant, Braidwood, which opened 26 years ago.  When it was new, the plant had permission to run as long as the temperature of its cooling water pond, a 2,500-acre lake in a former strip mine, remained below 98 degrees; in 2000 it got permission to raise the limit to 100 degrees.

The problem, said Craig Nesbit, a spokesman for Exelon, which owns the plant, is not only the hot days, but the hot nights. In normal weather, the water in the lake heats up during the day but cools down at night; lately, nighttime temperatures have been in the 90s, so the water does not cool.

Asked whether he viewed Braidwood’s difficulties as a byproduct of global warming, Mr. Nesbit said: “I’m not a climatologist. But clearly the calculations when the plant was first operated in 1986 are not what is sufficient today, not all the time.”

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