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NRC permits Millstone Unit 3 to increase temperature limit of L.I. Sound water to 80 degrees

By Judy Benson

Publication: theday.com

Published July 14. 2014 11:40AM   Updated July 15. 2014 12:23AM

Waterford — The Nuclear Regulatory Commission announced Monday that it has approved a license amendment request for Unit 3 at the Millstone Power Station to increase the temperature limit for cooling water drawn from Long Island Sound from 75 to 80 degrees.

The action follows the NRC’s approval in April for 80-degree water to be used at Unit 2. Millstone owner Dominion submitted the request to use the warmer water in May 2013. Under the new limit, if the water temperature exceeds 80 degrees, Unit 3 must be placed in “hot” standby within 6 hours and “cold” shutdown within the following 30 hours, NRC spokesman Neil Sheehan said in a statement.

The NRC’s review included an evaluation of the company’s design inputs, assumptions and methodology to ensure that equipment and systems important to safety would not be adversely impacted by the change, Sheehan said. In the summer of 2012, Millstone 2 was forced to shut down for 11 days after the 75-degree temperature limit was exceeded. 

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