Watts Bar Nuclear Generating Station
The plant, construction of which began in 1973, has two Westinghouse pressurized water reactor units: Unit 1, completed in 1996, and Unit 2, completed in 2015. Unit 1 has a winter net dependable generating capacity of 1,167 megawatts. Unit 2 has a capacity of 1,165 megawatts. Unit 2 was the first of three new power reactors to enter service in the 21st century in the United States, followed by Vogtle Electric Generating Plant Units 3 and 4.
Unit 1
Construction on Unit 1 began on 23 January 1973 and suffered from many delays. After construction was halted on both units in 1985, construction resumed on Unit 1 in 1992. Criticality was first achieved on 1 January 1996, and commercial operation began on May 5, 1996.
In the early 2000s, the four original steam generator units were replaced with units made from Inconel 690 which is more resistant to stress corrosion cracking.
Unit 2
Unit 2 construction started in 1972. Unit 2 was 60% complete when construction on both units was stopped in 1985 due in part to a projected decrease in power demand. In 2007, the Tennessee Valley Authority (TVA) Board approved completion of Unit 2 on August 1, and construction resumed on October 15. The project was expected to cost $2.5 billion and employ around 2,300 contractor workers. Once finished, it was expected to employ 250 people in permanent jobs. The final cost of the plant is estimated at $6.1 billion.
A year after the 2011 Tōhoku earthquake and tsunami and subsequent Fukushima Daiichi nuclear disaster, the Nuclear Regulatory Commission (NRC) issued 9 orders to improve safety at domestic plants. Two changes applied to Watts Bar Unit 2 and required design modifications: "Mitigation Strategies Order" and "Spent Fuel Pool Instrumentation Order". In February 2012, TVA said the design modifications to Watts Bar 2 were partially responsible for the project running over budget and behind schedule. The second unit costs a total of $4.7 billion bringing the total costs of the two unit plant to more than $12 billion. It will likely be the last Generation II reactor to be completed in the US.
TVA declared construction substantially complete in August 2015 and requested that NRC staff proceed with the final licensing review; on October 22, the NRC approved a 40-year operating license for Unit 2, marking the formal end of construction and allowing for the installation of nuclear fuel and subsequent testing. On December 15, 2015, TVA announced that the reactor was fully loaded with fuel and ready for criticality and power ascension tests. In March 2016, the NRC described the project as a "chilled work environment," where employees are reluctant to raise safety concerns for fear of retribution.
On May 23, 2016, initial criticality was achieved. Commercial operation began in October 2016. On October 19, 2016 the Watts Bar 2 was the first United States reactor to enter commercial operation since 1996. Due to failures in its condenser, TVA took it offline on March 23, 2017. The condenser, which was installed during the original construction phase of the plant in the 1970s, suffered a structural failure in one of its sections. On August 1, 2017, the unit was restarted after four months of repairs to the condenser.
In 2022, the four original steam generator units installed in the 1970s were replaced with units made from Inconel 690 which is more resistant to stress corrosion cracking and expected to last the life of the plant. Replacing the units involved cutting two large holes in the containment building. Because of radioactive contamination the old units will be kept until the plant is decommissioned.
Electricity Production
Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual (Total) |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2001 | 865,401 | 785,394 | 867,441 | 831,506 | 854,829 | 781,099 | 546,540 | 832,025 | 752,854 | 861,068 | 832,257 | 816,161 | 9,626,575 |
2002 | 867,654 | 666,737 | 247,153 | 828,559 | 668,949 | 812,577 | 786,082 | 831,704 | 811,209 | 854,034 | 840,231 | 863,464 | 9,078,353 |
2003 | 874,381 | 788,422 | 682,375 | 830,918 | 850,445 | 815,140 | 830,671 | 771,811 | 145,510 | 251,039 | 839,063 | 869,036 | 8,548,811 |
2004 | 790,787 | 812,896 | 861,019 | 829,429 | 844,969 | 809,214 | 831,329 | 830,935 | 708,344 | 846,240 | 828,868 | 862,873 | 9,856,903 |
2005 | 856,865 | 574,589 | -12,464 | 787,969 | 850,040 | 806,093 | 827,508 | 822,971 | 760,234 | 845,165 | 827,117 | 857,868 | 8,803,955 |
2006 | 863,241 | 712,653 | 840,779 | 819,625 | 806,229 | 104,495 | 808,856 | 696,280 | 255,819 | -6,120 | -12,838 | 789,079 | 6,678,098 |
2007 | 847,063 | 794,789 | 842,491 | 842,160 | 860,541 | 817,964 | 842,218 | 822,564 | 813,716 | 852,528 | 841,477 | 872,175 | 10,049,686 |
2008 | 873,261 | 261,900 | 120,189 | 837,789 | 581,768 | 790,206 | 837,210 | 563,329 | 666,098 | 860,272 | 844,163 | 876,124 | 8,112,309 |
2009 | 878,273 | 791,352 | 831,643 | 840,996 | 857,449 | 815,615 | 841,810 | 838,200 | 534,880 | 272,182 | 832,706 | 872,359 | 9,207,465 |
2010 | 831,615 | 793,007 | 872,123 | 838,259 | 684,320 | 813,889 | 837,006 | 799,849 | 817,744 | 861,066 | 715,384 | 874,195 | 9,738,457 |
2011 | 875,658 | 786,916 | 791,302 | 57,454 | 116,536 | 798,773 | 833,360 | 824,327 | 819,858 | 629,340 | 836,448 | 861,012 | 8,230,984 |
2012 | 867,879 | 813,000 | 860,501 | 829,765 | 845,534 | 811,824 | 830,376 | 756,716 | 228,900 | 7,118 | 834,875 | 829,983 | 8,516,471 |
2013 | 866,265 | 782,801 | 864,022 | 827,505 | 845,863 | 744,031 | 833,711 | 837,231 | 813,145 | 853,805 | 840,348 | 859,076 | 9,967,803 |
2014 | 872,923 | 785,077 | 633,303 | -12,074 | 738,213 | 810,194 | 754,183 | 830,449 | 809,351 | 848,741 | 838,751 | 868,504 | 8,777,615 |
2015 | 870,146 | 566,898 | 783,904 | 822,440 | 843,297 | 794,445 | 802,791 | 822,161 | 488,794 | 186,565 | 608,004 | 859,705 | 8,449,150 |
2016 | 863,426 | 800,168 | 706,793 | 800,663 | 818,177 | 762,692 | 1,034,064 | 906,079 | 792,838 | 1,422,247 | 1,664,235 | 1,764,096 | 12,335,478 |
2017 | 1,758,293 | 1,589,981 | 1,027,929 | -22,258 | 569,823 | 773,659 | 825,538 | 1,512,310 | 1,677,002 | 1,626,640 | 847,376 | 1,389,910 | 13,576,203 |
2018 | 1,782,004 | 1,592,296 | 1,771,056 | 1,611,462 | 1,684,194 | 1,393,973 | 1,657,810 | 1,512,727 | 1,186,680 | 849,587 | 1,657,365 | 1,773,479 | 18,472,633 |
2019 | 1,776,869 | 1,433,694 | 1,762,683 | 1,172,709 | 1,138,695 | 1,649,612 | 1,683,870 | 1,686,646 | 786,465 | 1,089,909 | 1,711,324 | 1,763,310 | 17,655,786 |
2020 | 1,763,054 | 1,593,092 | 1,675,291 | 1,685,834 | 419,862 | 1,426,193 | 1,654,860 | 1,662,790 | 1,551,432 | 1,399,109 | 1,077,497 | 1,679,992 | 17,589,006 |
2021 | 1,685,672 | 1,520,935 | 1,599,308 | 1,592,636 | 1,621,629 | 1,541,734 | 1,584,771 | 1,582,295 | 1,044,650 | 1,527,420 | 812,929 | 1,561,616 | 17,675,595 |
2022 | 1,732,923 | 1,555,921 | 825,225 | 833,189 | 840,043 | 797,974 | 1,630,675 | 1,693,139 | 1,663,035 | 1,719,271 | 1,744,557 | 1,772,149 | 16,808,101 |
2023 | 1,755,010 | 1,592,494 | 1,754,083 |
Tritium production
The NRC operating license for Watts Bar was modified in September 2002 to allow irradiation of tritium-producing burnable absorber rods at Watts Bar to produce tritium for the U.S. Department of Energy's (DOE's) National Nuclear Security Administration in order to maintain the viability of America's nuclear weapons. Tritium, the fusion fuel in nuclear weapons, has a half-life of 12.3 years, which means it decays at 5.5% per year and must be renewed. The Watts Bar license amendment permits TVA to irradiate up to approximately 2,000 tritium-producing rods in the Watts Bar reactor.
TVA began irradiating tritium-producing rods at Unit 1 in the fall of 2003. TVA removed these rods from the reactor in the spring of 2005. DOE successfully shipped them to its tritium extraction facility at Savannah River Site in South Carolina. DOE reimburses TVA for the cost of providing the irradiation services and also pays TVA a fee for each tritium-producing rod that is irradiated. During the times the reactor does this, it must be fuelled with "unobligated" uranium, (uranium that is not legally or contractually restricted to peaceful use only, as most commercial reactor uranium is). Technology and equipment as well as the fuel used to produce it must be of U.S. origin.
Surrounding population
![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Watts_Bar-2.jpg/200px-Watts_Bar-2.jpg)
The NRC 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.
The 2010 U.S. population within 10 miles (16 km) of Watts Bar was 18,452, an increase of 4.1 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 1,186,648, an increase of 12.8 percent since 2000.
Seismic risk
The NRC's estimate of the risk each year of an earthquake intense enough to cause core damage to the reactor at Watts Bar was 1 in 27,778, according to an NRC study published in August 2010. The 2018 Southern Appalachian earthquake's epicenter was located two miles east of the facility. The TVA reported that their facilities are designed to withstand seismic events and were not impacted by the earthquake, but personnel would conduct further inspections as a precaution.
See also
- Watts Bar Dam
- Watts Bar Steam Plant
- List of the largest nuclear power stations in the United States
- List of power stations in Tennessee
Notes
- ^ Although Unit 2 originally began construction on September 1, 1973, construction was halted on September 17, 1985 due to regulatory and economic factors. Construction was subsequently resumed on October 15, 2007, and the plant was completed on October 19, 2016, 43 years after construction first started (although the plant was only under active construction for 21 of those years).
References
- ^ Gang, Duane W. (August 29, 2014). "5 things to know about TVA and nuclear power". The Tennessean. Nashville, Tennessee. Retrieved 2019-01-07.
- ^ "WATTS BAR-1: Reactor Details". Power Reactor Information System. International Atomic Energy Agency. Retrieved July 14, 2018.
- ^ "Swapping steam generators at Watts Bar". Nuclear Engineering International. 5 April 2023. Retrieved 16 April 2023.
- ^ Hiltzik, Michael (2017-05-08). "America's first '21st century nuclear plant' already has been shut down for repairs". Los Angeles Times. ISSN 0458-3035. Retrieved 2017-05-09.
- ^ DiSavino, Scott (March 16, 2012). "TVA cuts contractors at Alabama Bellefonte nuclear site". Reuters.
- ^ "WATTS BAR-2". PRIS. International Atomic Energy Agency. June 29, 2013. Retrieved June 29, 2013.
- ^ "TVA: Watts Bar Nuclear Plant". Tennessee Valley Authority. February 10, 2008. Archived from the original on February 12, 2012. Retrieved March 14, 2012.
- ^ "Mitigation Strategies". nrc.gov. Retrieved 2015-11-09.
- ^ "Spent Fuel Pool Instrumentation Order". nrc.gov. Retrieved 2015-11-09.
- ^ "TVA Awards Watts Bar, Sequoyah Outage Contract To Westinghouse". nuclearstreet.com. 2016-02-22. Retrieved 2017-03-05.
- ^ Mintz Testa, Bridget (27 May 2012). "Three Generations of Nuclear Power Plants in the U.S." About.com. Archived from the original on 10 April 2016. Retrieved 7 March 2017.
- ^ "Watts Bar nuclear reactor granted operating license - first new U.S. reactor in 19 years". timesfreepress.com. Retrieved 2015-10-22.
- ^ Today — Initial Criticality Archived 2016-06-10 at the Wayback Machine. www.tva.com. Retrieved 23 May 2016.
- ^ "Watts Bar power ascension tests completed". www.timesfreepress.com. Time Free Press. 3 October 2016. Archived from the original on 4 October 2016. Retrieved 4 October 2016.
The newest unit at the Watts Bar plant near Spring City, Tenn. is now producing more than 1,150 megawatts of electricity ...
- ^ Blau, Max (2016-10-20). "First new US nuclear reactor in 20 years goes live". CNN.com. Cable News Network. Turner Broadcasting System, Inc. Retrieved 2016-10-20.
- ^ "Electricity Data Browser". www.eia.gov. Retrieved 2023-01-08.
- ^ "USA awards HEU downblending contract". World Nuclear News. 1 October 2018. Retrieved 3 October 2018.
- ^ "NRC: Backgrounder on Emergency Preparedness at Nuclear Power Plants". Fact Sheets. Nuclear Regulatory Commission. January 2009. Retrieved March 14, 2012.
- ^ Dedman, Bill (April 14, 2011). "Nuclear neighbors: Population rises near US reactors". NBCNews.com. Retrieved May 1, 2011.
- ^ Dedman, Bill (March 17, 2011). "What are the odds? US nuke plants ranked by quake risk". NBCNews.com. Retrieved April 19, 2011.
- ^ "Strongest earthquake since 1973 hits East Tennessee". WVLT-TV. December 12, 2018. Retrieved December 12, 2018.
- ^ Dedman, Bill (March 17, 2011). "What are the odds? US nuke plants ranked by quake risk". NBCNews.com. Retrieved April 19, 2011.
- ^ Hiland, Patrick (2010-09-02). "Implications of Updated Probabilistic Seismic Hazard Estimates in Central and Eastern United States on Existing Plants" (PDF). MSNBC Media. Archived from the original (PDF) on 2017-05-25. Retrieved 2016-10-05.
External links
![](http://upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png)
- Official website
- "Response to Comments" (PDF). (2.70 MB)
- "Watts Bar Nuclear Plant, Tennessee". U.S. Department of Energy (DOE). October 10, 2008. Retrieved 2008-11-16.
- "Watts Bar 1 Pressurized Water Reactor". Operating Nuclear Power Reactors. U.S. Nuclear Regulatory Commission (NRC). February 14, 2008. Retrieved 2008-11-16.
- "Watts Bar Unit 2 Reactivation". NRC. July 31, 2008. Retrieved 2015-08-04.
- "History of Watts Bar Unit 2 Reactivation". NRC. June 9, 2008. Retrieved 2015-08-04.