Millstone Nuclear Power Plant

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Millstone Nuclear Power Plant
Millstone Nuclear Power Plant is located in Connecticut
Location of Millstone Nuclear Power Plant
CountryUnited States
LocationWaterford, Connecticut
Coordinates41°18′43″N 72°10′7″W / 41.31194°N 72.16861°W / 41.31194; -72.16861Coordinates: 41°18′43″N 72°10′7″W / 41.31194°N 72.16861°W / 41.31194; -72.16861
StatusOperational
Commission dateUnit 2: December 26, 1975
Unit 3: April 23, 1986
Licence expirationUnit 2: July 31, 2035
Unit 3: November 25, 2045
Construction costUnit 2: $424 million
Unit 3: $3.77 billion
Operator(s)Dominion Resources
Reactor information
Reactors operationalUnit 2: 882 MW
Unit 3: 1,155
Reactor type(s)PWR
Reactor supplier(s)Unit 2: Combustion Engineering
Unit 3:Westinghouse
Power generation information
Installed capacity2,037 MW
Annual generation16,385 GW·h
Website
Millstone
 
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Millstone Nuclear Power Plant
Millstone Nuclear Power Plant is located in Connecticut
Location of Millstone Nuclear Power Plant
CountryUnited States
LocationWaterford, Connecticut
Coordinates41°18′43″N 72°10′7″W / 41.31194°N 72.16861°W / 41.31194; -72.16861Coordinates: 41°18′43″N 72°10′7″W / 41.31194°N 72.16861°W / 41.31194; -72.16861
StatusOperational
Commission dateUnit 2: December 26, 1975
Unit 3: April 23, 1986
Licence expirationUnit 2: July 31, 2035
Unit 3: November 25, 2045
Construction costUnit 2: $424 million
Unit 3: $3.77 billion
Operator(s)Dominion Resources
Reactor information
Reactors operationalUnit 2: 882 MW
Unit 3: 1,155
Reactor type(s)PWR
Reactor supplier(s)Unit 2: Combustion Engineering
Unit 3:Westinghouse
Power generation information
Installed capacity2,037 MW
Annual generation16,385 GW·h
Website
Millstone

The Millstone Nuclear Power Station is the only nuclear power generation site in Connecticut. It is located at a former quarry (from which it takes its name) in Waterford. Of the three reactors built here, units two and three are still operating at a combined output rating of 2020 MWe.

Contents

Background

The Millstone site covers about 500 acres (2 km²). The power generation complex was built by a consortium of utilities, using Niantic Bay (which is connected to Long Island Sound and the Atlantic Ocean) as a source of coolant water.

Although located in Waterford, Millstone is most clearly seen from downtown Niantic. It is visible from the Niantic Boardwalk area and from the Niantic River Bridge, and is also visible to Amtrak customers on the NEC line which as it skirts Niantic Bay.

Millstone earned OSHA's top award for workplace safety on October 14, 2004,[1] and earned the Top Industry Practice/ Framatone ANP Vendor Award for its work developing novel ultrasonic leak inspection techniques in March 2001.[2]

Millstone Units 2 and 3, both pressurized water reactors (one from Westinghouse and one from Combustion Engineering), were sold to Dominion by Northeast Utilities in 2000 and continue to operate.

On November 28, 2005, after a 22-month application and evaluation process, Millstone was granted a 20-year license extension to both units 2 and 3 by the NRC.[3]

Licensing history and milestones

Unit 1

Millstone 1 was a General Electric boiling water reactor, producing 660 MWe, shut down in November 1995 before being permanently closed in July 1998. On February 20, 1996 a leaking valve forced the shutdown of this unit, and unit 2; multiple equipment failures were found.

Unit 2

Millstone 2 is a Combustion Engineering plant built in the 1970s, and has a maximum power output of 2700 MWth (870 MWe). It has 2 steam generators, and 4 reactor cooling pumps (RCP). It is currently undergoing an upgrade to its safe shutdown system which already met NRC standards. During its refueling outage in October 2006, the operator installed a new pressurizer.

Unit 3

Millstone 3 is a Westinghouse plant that started operating in 1986, and has a maximum power output of 3411 MWth (1150 MWe). Recently, the NRC approved a power uprate for Unit 3 that will increase its electrical output 7.006% to 3650 MWth (1230 MWe). The increase will take effect by the end of 2008.[4]

Events

On February 26, 1996, a leaking valve forced the shutdown of units 1 and 2. Multiple equipment failures were found.

On April 17, 2005, Millstone plant safely shut down without incident when a circuit board monitoring a steam pressure line short-circuited, which caused the board to malfunction and indicate an unsafe drop in pressure in the reactor's steam system, when in reality there was no drop in steam pressure. The cause was attributed to "tin whiskers". In response to this event, Millstone implemented a procedure to inspect for these whiskers at every refueling outage, or 18 months. David Lochbaum, a nuclear engineer with the Union of Concerned Scientists, while remaining critical of the processes leading to the discovery of the whiskers, praised Millstone for its handling of the situation.[5]

In September, 2009, unit 2 shut down when an electrical storm caused power fluctuations. When workers tried to restart the unit, they discovered a small leak in the reactor coolant pump. [6]

12/21/2009 Millstone Unit 3 Reactor Trip and Shutdown Greater Than 72 Hours.

07/27/2009 Millstone Unit 2 Reactor Trip and Shutdown Greater Than 72 Hours

Surrounding population

The Nuclear Regulatory Commission defines two emergency planning zones around nuclear power plants: a plume exposure pathway zone with a radius of 10 miles (16 km), concerned primarily with exposure to, and inhalation of, airborne radioactive contamination, and an ingestion pathway zone of about 50 miles (80 km), concerned primarily with ingestion of food and liquid contaminated by radioactivity.[7]

The 2010 U.S. population within 10 miles (16 km) of Millstone was 123,482, an increase of 29.5 percent in a decade, according to an analysis of U.S. Census data for msnbc.com. The 2010 U.S. population within 50 miles (80 km) was 2,996,756, an increase of 9.5 percent since 2000. Cities within 50 miles include Hartford (41 miles to city center).[8]

Seismic risk

The Nuclear Regulatory Commission's estimate of the risk each year of an earthquake intense enough to cause core damage to the reactor at Millstone was Reactor 2: 1 in 90,909; Reactor 3: 1 in 66,667, according to an NRC study published in August 2010.[9][10]

See also

References

  1. ^ Millstone Receives OSHA Recognition for Workplace Safety PR Newswire, 14-OCT-04
  2. ^ Sarver and Jordan: Maintenance at Millstone Nuclear News, October 2003
  3. ^ NRC Renews Millstone Nuclear Power Station Operating Licenses For An Additional 20 Years
  4. ^ [1][dead link]
  5. ^ Reactor Shutdown: Dominion Learns Big Lesson From A Tiny ‘tin Whisker'
  6. ^ http://www.ctpost.com/news/article/Millstone-2-operating-again-after-shutdown-6891.php#ixzz1GtOgmyQM
  7. ^ http://www.nrc.gov/reading-rm/doc-collections/fact-sheets/emerg-plan-prep-nuc-power-bg.html
  8. ^ Bill Dedman, Nuclear neighbors: Population rises near US reactors, msnbc.com, April 14, 2011 http://www.msnbc.msn.com/id/42555888/ns/us_news-life/ Accessed May 1, 2011.
  9. ^ Bill Dedman, "What are the odds? US nuke plants ranked by quake risk," msnbc.com, March 17, 2011 http://www.msnbc.msn.com/id/42103936/ Accessed April 19, 2011.
  10. ^ http://msnbcmedia.msn.com/i/msnbc/Sections/NEWS/quake%20nrc%20risk%20estimates.pdf

External links