Millstone Nuclear Power Plant

The Millstone Nuclear Power Station is the only nuclear power plant in Connecticut, United States, and the only multi-unit nuclear plant in New England. It is located at a former quarry (from which it takes its name) in Waterford.

With a total capacity of over 2 GW, the station produces enough electricity to power about 2 million homes.

The operation of the Millstone Power Station supports more than 3,900 jobs, and generates the equivalent of over half the electricity consumed in Connecticut.

The Millstone site covers about 500 acres (2 km2).

The plant has had numerous safety-related shutdowns and at times been placed on enhanced examination status by the Nuclear Regulatory Commission.

In 1999, Northeast Utilities, the plant's operator at the time, agreed to pay $10 million in fines for 25 counts of lying to federal investigators and for having falsified environmental reports.

Its subsidiary, Northeast Nuclear Energy Company, paid an additional $5 million for having made 19 false statements to federal regulators regarding the promotion of unqualified plant operators between 1992 and 1996.

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

Licensing history and milestones

250px|thumbnail|right|Work being performed on the [[containment structure at the Millstone Nuclear Power Plant.]]

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.

Construction permit issued: May 19, 1966
Final safety analysis report filed: November 1, 1968
Provisional operating license issued: October 7, 1970
Full term operating license issued: October 31, 1986
Full power license: October 7, 1970
Synchronized to the grid: November 1970
Commercial operation: December 28, 1970
100% power: January 6, 1971
The U.S. Nuclear Regulatory Commission began a safety investigation relating to refueling procedures, based on information provided by George Galatis, a senior nuclear engineer, 1995.
Leaking valve forced shutdown multiple equipment failures detected: February 20, 1996
Permanently ceased operations: July 21, 1998

Unit 2

Millstone 2 is a Combustion Engineering pressurized water reactor plant built in the 1970s, and has a maximum power output of 2700 thermal megawatts, or MWth (870 MWe). It has 2 steam generators, and 4 reactor cooling pumps. It is 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.

Construction permit issued: December 11, 1970
Final safety analysis report filed: August 15, 1972
Full term operating licensing issued: September 26, 1975
Full power license: September 26, 1975
Initial criticality: January 17, 1975
Construction permit issued: August 9, 1974

!Year

!Jan

!Feb

!Mar

!Apr

!May

!Jun

!Jul

!Aug

!Sep

!Oct

!Nov

!Dec

!Annual (Total)

!2001

|1,366,126

|620,610

|643,005

|1,368,619

|1,342,326

|1,441,469

|1,464,628

|1,396,871

|1,435,437

|1,491,469

|1,372,527

|1,484,680

!15,427,767

!2002

|1,477,462

|1,020,136

|850,042

|1,159,749

|1,497,037

|1,421,445

|1,484,163

|1,292,391

|750,180

|1,251,934

|1,453,640

|1,260,093

!14,918,272

!2003

|1,447,607

|1,364,927

|1,087,699

|1,458,326

|1,509,611

|1,419,320

|1,496,738

|1,485,570

|1,442,531

|1,052,843

|823,382

|1,489,541

!16,078,095

!2004

|1,514,725

|1,416,949

|1,357,314

|669,780

|1,198,434

|1,466,127

|1,500,558

|1,494,418

|1,455,788

|1,514,313

|1,435,926

|1,514,765

!16,539,097

!2005

|1,517,951

|1,371,151

|1,512,889

|615,298

|1,098,080

|1,464,341

|1,506,553

|1,497,980

|1,406,057

|719,636

|1,459,379

|1,392,807

!15,562,122

!2006

|1,519,136

|1,308,343

|1,518,458

|1,280,682

|1,516,725

|1,463,454

|1,502,444

|1,498,380

|1,453,911

|959,234

|1,055,264

|1,513,415

!16,589,446

!2007

|1,413,243

|1,365,236

|1,510,387

|790,130

|959,038

|1,454,548

|1,498,812

|1,493,112

|1,446,523

|1,497,311

|1,456,391

|1,501,411

!16,386,142

!2008

|1,506,855

|1,407,918

|1,503,666

|923,531

|1,032,094

|1,394,073

|1,463,357

|1,484,185

|1,440,365

|940,798

|771,358

|1,564,746

!15,432,946

!2009

|1,568,502

|1,416,776

|1,560,557

|1,518,510

|1,566,800

|1,512,957

|1,086,929

|1,546,944

|1,502,156

|1,034,216

|1,130,862

|1,212,173

!16,657,382

!2010

|1,403,129

|1,368,339

|1,560,238

|918,593

|947,990

|1,518,345

|1,561,523

|1,446,144

|1,506,738

|1,565,484

|1,425,006

|1,528,775

!16,750,304

!2011

|1,573,286

|1,417,144

|1,571,839

|927,458

|1,501,912

|1,438,058

|1,555,841

|1,499,191

|1,189,238

|858,702

|823,268

|1,571,900

!15,927,837

!2012

|1,557,888

|1,455,944

|1,570,928

|1,518,162

|1,546,933

|1,512,620

|1,528,126

|1,287,047

|1,491,488

|1,015,837

|1,024,275

|1,568,639

!17,077,887

!2013

|1,570,408

|1,418,239

|1,568,407

|1,006,680

|998,334

|1,513,501

|1,554,382

|1,396,122

|1,500,677

|1,552,489

|1,434,929

|1,565,414

!17,079,582

!2014

|1,547,921

|1,370,137

|1,564,866

|984,611

|915,374

|1,433,769

|1,456,260

|1,545,219

|1,492,737

|957,780

|1,003,232

|1,568,713

!15,840,619

!2015

|1,569,302

|1,416,474

|1,566,390

|1,386,998

|1,564,086

|1,511,809

|1,555,196

|1,548,421

|1,494,525

|963,025

|1,278,219

|1,556,472

!17,410,917

!2016

|1,395,804

|1,453,731

|1,553,691

|870,970

|1,042,398

|1,157,289

|1,545,157

|1,465,939

|1,492,559

|1,541,912

|1,502,398

|1,553,644

!16,575,492

!2017

|1,552,802

|1,405,299

|1,549,445

|888,022

|1,440,352

|1,499,861

|1,540,401

|1,532,203

|1,488,432

|974,762

|1,069,696

|1,558,346

!16,499,621

!2018

|1,562,198

|1,408,160

|1,557,604

|1,503,520

|1,550,957

|1,500,266

|1,538,028

|1,528,480

|1,397,258

|907,772

|887,693

|1,539,556

!16,881,492

!2019

|1,556,867

|1,406,987

|1,549,156

|755,800

|1,035,404

|1,502,805

|1,537,561

|1,535,968

|1,486,081

|1,540,270

|1,500,314

|1,326,185

!16,733,398

!2020

|1,555,862

|1,460,856

|1,559,892

|985,158

|912,169

|1,380,637

|1,544,050

|1,511,859

|1,492,689

|664,016

|1,135,412

|1,512,255

!15,714,855

!2021

|1,399,646

|1,413,362

|1,565,742

|1,513,226

|1,561,563

|1,261,548

|1,547,127

|1,527,962

|1,488,664

|1,036,856

|1,341,626

|1,559,187

!17,216,509

!2022

|1,423,440

|1,408,875

|1,556,974

|802,500

|644,649

|1,385,138

|1,551,414

|1,546,783

|1,494,689

|1,557,614

|1,519,821

|1,572,270

!16,464,167

!2023

|1,526,170

|1,360,879

|1,556,546

|999,245

|868,981

|26,108

|1,443,004

|1,542,360

|1,311,751

|1,159,993

|624,914

|1,249,507

!13,669,458

!2024

|1,263,781

|1,466,547

|1,568,155

|1,517,438

|1,557,143

|1,508,201

|1,548,361

|1,514,012

|1,070,529

|972,997

|1,321,169

|1,561.972

!16,870,305

!2025

|1,571,220

|1,419,146

|1,568,612

|903,225

|1,001,034

|1,512,989

|1,550,247

|1,397,998

|1,488,023

|1,213,930

|1,509,367

|1,572,926

!16,708,717

!2026

|1,573,882

|1,420,114

!2,993,996 (YTD)

Safety and environmental events

In December 1977, two hydrogen explosions occurred at the plant.

The second explosion injured one man, who required hospitalization.

In October 1990, operator error during a routine test caused a shutdown of unit 2.

In September 1991, twenty reactor operators failed required licensing examinations. The shortfall of licensed operators necessitated a shutdown of unit 1 until March 1992.

Time magazine featured the plant on its cover, calling its operator a "rogue utility", and the Nuclear Regulatory Commission singled out Millstone for additional attention.

In 2002 Millstone's operators were fined $288,000 for failing to have properly accounted for two uranium fuel rod components that had been misplaced 30 years earlier in 1972.

On April 17, 2005, Millstone unit 3 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 on the board. In response to this event, Millstone implemented a procedure to inspect for these whiskers at every refueling outage, or 18 months.

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.

On December 21, 2009 the Unit 3 reactor tripped and shut down for longer than 72 hours.

On July 27, 2009, the Unit 2 reactor tripped and shut down for longer than 72 hours.

On August 9, 2013, the Unit 3 reactor tripped and shut down due to a malfunction.

In 2016, unit 3 was shut down following a hydrogen gas leak.

Surrounding population

The Nuclear Regulatory Commission defines two emergency planning zones around nuclear power plants: a plume exposure pathway zone with a radius of , concerned primarily with exposure to, and inhalation of, airborne radioactive contamination, and an ingestion pathway zone of about , concerned primarily with ingestion of food and liquid contaminated by radioactivity.

The 2010 U.S. population within 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 was 2,996,756, an increase of 9.5 percent since 2000. Cities within 50 miles include Hartford (41 miles to city center) and New Haven (43 miles to city center).

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 1 in 90,909 for Reactor 2 and 1 in 66,667 for Reactor 3, according to an NRC study published in August 2010.

References

External links

Dominion's nuclear page
DoE Page
NukeWorker