Sequoyah Nuclear Plant Explained

Sequoyah Nuclear Plant
Coordinates:35.2264°N -85.0917°W
Country:United States
Location:Hamilton County, near Soddy-Daisy, Tennessee
Status:O
Commissioned:Unit 1: July 1, 1981
Unit 2: June 1, 1982
Cost:$3.455 billion (2007 USD)[1]
Owner:Tennessee Valley Authority
Operator:Tennessee Valley Authority
Np Reactor Type:PWR
Np Reactor Supplier:Westinghouse
Ps Cooling Source:Chickamauga Lake
Ps Cooling Towers:2 × Natural Draft
(supplemental only)
Ps Units Operational:2 × 1220 MW
Ps Units Manu Model:WH 4-loop (ICECND)
Ps Thermal Capacity:2 × 3455 MWth
Ps Electrical Capacity:2440
Ps Electrical Cap Fac:91.38% (2017)
75.50% (lifetime)
Ps Annual Generation:17,654 GWh (2021)
Website:Sequoyah Nuclear Plant

The Sequoyah Nuclear Plant is a nuclear power plant located on located east of Soddy-Daisy, Tennessee, and north of Chattanooga, abutting Chickamauga Lake on the Tennessee River. The facility is owned and operated by the Tennessee Valley Authority (TVA).

The plant has two Westinghouse pressurized water reactors. Sequoyah units 1 & 2, as well as their sister plant at Watts Bar, both have ice condenser containment systems. In case of a large loss-of-coolant accident, steam generated by the leak is directed toward borated ice which helps condense the steam creating a lower pressure, allowing for a smaller containment building.

Description

Sequoyah's two units have a winter net dependable capacity of 2,440 megawatts,[2] making Sequoyah the most productive of TVA's three nuclear plants. Sequoyah is the second-most powerful power plant in Tennessee, after the Cumberland Fossil Plant northwest of Nashville, but actually generates more power.[3] Following the restart of Brown's Ferry Unit 1, that plant became TVAs most productive at 3,440 MW.

TVA constructed dry cask storage facilities at Sequoyah and purchased special storage containers for the purpose of storing spent nuclear fuel. The storage facilities have been approved by the NRC.

History

Construction began on Sequoyah on May 27, 1970. Unit 1 was licensed by the NRC on September 17, 1980, and commercial operation began on July 1, 1981.[4] [5] Unit 2 was licensed on September 15, 1981, and began operation on June 1, 1982.[6] [5] Sequoyah was the first new nuclear plant licensed after the Three Mile Island accident.

On August 22, 1985, Sequoyah was shut down due to safety concerns.[7] An independent contractor hired to analyze the safety systems of the plant had found that TVA lacked documentation proving that all of the plant's safety systems would function properly in the event of an emergency.[8] Brown's Ferry, TVA's only other operating nuclear plant at the time, had been shut down in March 1985, due to safety concerns about a fire ten years earlier, and during this time, TVA was without nuclear power completely.[8] On March 22, 1988, TVA was authorized by the NRC to restart both Sequoyah units.[9] Both reactors returned to service later that year.[10]

The operating license of Sequoyah's Unit 1 was originally set to expire in 2020, and Unit 2's operating license in 2021. In 2015, the NRC renewed the operating license for both units for an additional 20 years.[11] TVA's Sequoyah operating license was modified in September 2002 to allow TVA to irradiate tritium-producing burnable absorber rods at Sequoyah for the U.S. Department of Energy. The process of irradiating tritium-producing rods produces tritium, which is used in nuclear weapons and for various forms of research into nuclear fusion for commercial power production. TVA began irradiating tritium-producing rods at its Watts Bar Nuclear Plant in 2003. As of February 2007, TVA had no plans to produce tritium at Sequoyah.

Name

Sequoyah was Cherokee, part of the Overhill Cherokee, reportedly born in Tuskegee, a town at the confluence of the Tellico River and Little Tennessee River, upriver of the nuclear power plant. He is known for creating the Cherokee syllabary circa 1820. Many Cherokee sites were flooded during the TVA construction of Tellico Dam (1967-1979). Naming the site after a local Native American was considered a small political token to the Cherokee in compensation for the dam-flooding and destruction of their historic sites that TVA required to control flooding on the Tennessee River.

Electricity Production

Generation (MWh) of Sequoyah Nuclear Plant[12] !Year!Jan!Feb!Mar!Apr!May!Jun!Jul!Aug!Sep!Oct!Nov!Dec!Annual (Total)
20011,715,6211,547,2741,688,1821,652,2271,691,7011,626,0291,651,6661,651,4961,618,5051,416,882989,4161,700,85718,949,856
20021,712,4981,548,1291,712,6961,179,3831,020,4991,588,5791,578,6181,642,6691,605,8611,691,6561,648,0051,566,97918,495,572
20031,538,1481,549,716889,060772,530843,5041,109,8051,668,4751,585,8711,602,9561,715,3571,079,4121,248,93515,603,769
20041,194,3781,622,4961,580,7431,670,2441,716,9121,643,6891,690,0481,685,6881,644,2121,509,6331,061,4931,735,83218,755,368
20051,734,2481,464,3501,736,7551,362,460892,4971,653,2801,694,1891,687,5581,635,4441,716,1061,678,3631,743,90318,999,153
20061,682,2191,570,9141,604,2911,042,9981,274,2161,647,7541,678,1651,664,6881,633,3301,716,1091,511,763974,23218,000,679
20071,677,8551,571,2101,673,4501,668,0961,723,1371,654,0591,691,5611,676,0851,534,271898,5081,143,3441,739,10918,650,685
20081,679,1701,626,6051,735,1601,618,395947,3971,504,2511,681,6161,657,2701,639,4471,715,0451,371,1381,741,81418,917,308
20091,740,5121,569,8821,448,218821,3781,451,0441,614,9631,658,1031,666,4401,625,4771,530,500910,6631,717,35617,754,536
20101,718,9541,553,3441,651,2861,631,9621,611,0121,487,6841,656,0241,637,1601,510,126834,0891,136,9141,572,20918,000,764
20111,719,5141,553,9661,714,7201,621,1611,319,880946,4541,572,7961,578,7181,582,1981,699,0071,662,1031,717,67618,688,193
20121,718,1581,490,254810,3761,567,2101,583,7741,622,3321,654,9481,585,6661,621,5901,231,806834,276865,24016,585,630
20131,530,5581,393,0761,740,5031,662,1061,745,4131,641,3031,690,9711,680,3361,557,2441,109,7681,054,0611,720,67218,526,011
20141,723,9561,557,2211,719,0141,596,7601,083,3781,133,8961,680,2761,673,6001,625,5201,704,3341,668,5781,725,85818,892,391
20151,715,6481,559,6581,261,8191,022,3681,233,5181,633,9981,481,6011,454,3721,437,8501,669,3861,067,578973,52616,511,322
2016841,395910,0711,718,6961,654,1851,535,8661,625,3511,655,5031,644,6461,605,9921,688,9081,514,545847,45017,242,608
20171,300,0051,576,2141,717,9761,537,391848,4721,456,8601,675,5801,665,1701,630,5541,446,3871,664,3601,722,33018,241,299
20181,723,3521,506,3451,718,484987,5651,482,1221,636,9941,664,1941,666,8281,607,0221,550,238866,0691,294,53617,703,749
20191,720,4941,554,4951,717,9331,557,9311,702,7081,636,1501,675,1441,576,3881,394,3691,017,551890,8141,620,64218,064,619
20201,623,3121,612,7661,694,1621,057,3351,438,8391,642,5191,655,7881,644,4771,626,0361,709,7271,667,8411,726,38719,099,189
20211,726,9341,559,1321,723,1281,069,1041,196,3801,640,4261,678,0001,560,8251,520,846869,7821,385,3171,724,93817,654,812
20221,725,3441,558,9341,722,1221,662,0141,707,9801,413,2091,667,4901,667,0821,632,6181,371,24016,128,033
2023

Surrounding population

The NRC defines two emergency planning zones around nuclear power plants: a plume exposure pathway zone of radius (concerned primarily with exposure to, and inhalation of, airborne radioactive contamination), and an ingestion pathway zone of about radius (concerned primarily with ingestion of food and liquid contaminated by radioactivity).[13]

The 2010 U.S. population within of Sequoyah was 99,664, according to 2010 U.S. Census data analyzed for msnbc.com, an increase of 13.8 percent in a decade.[14] The 2010 U.S. population within was 1,079,868 (increase of 13.8 percent).[14] Cities within 50 miles include Chattanooga (14 miles to city center).[14]

Seismic risk

The NRC's estimate of the risk each year of an earthquake intense enough to cause core damage to the reactor at Sequoyah was 1 in 19,608, according to an NRC study published in August 2010.[15] [16]

See also

External links

Notes and References

  1. Web site: EIA - State Nuclear Profiles. www.eia.gov. 3 October 2017. en.
  2. Securities & Exchange Commission filing. Available at https://www.sec.gov/
  3. Web site: Tennessee - State Energy Profile. . May 17, 2018. eia.gov. U.S. Energy Information Administration. 2018-11-02.
  4. Web site: Sequoyah Nuclear Plant, Unit 1. . nrc.gov. U.S. Nuclear Regulatory Commission. 2019-08-30.
  5. Web site: Sequoyah Nuclear Plant. . 2018. tva.gov. Tennessee Valley Authority. 2019-01-07.
  6. Web site: Sequoyah Nuclear Plant, Unit 2. . nrc.gov. U.S. Nuclear Regulatory Commission . 2019-08-30.
  7. News: George. Dan. August 23, 1985. TVA Completes Shutdown of Sequoyah Plant. The Associated Press. New York City. 2019-01-07.
  8. News: August 22, 1985. T.V.A. CITING SAFETY, TO SHUT DOWN NUCLEAR PLANT. The New York Times. New York City . Associated Press. 2019-01-07.
  9. News: March 23, 1988. TVA GETS GREEN LIGHT TO RESTART SEQUOYAH UNIT 2. The Journal of Commerce. Hudson Yards, New York. 2019-01-07.
  10. News: Lippman. Thomas W. . April 11, 1990. FOR TVA, IT'S BACK TO A NUCLEAR FUTURE. The Washington Post. Washington, DC. 2019-01-07.
  11. Web site: Archived copy . 2015-09-28 . 2015-09-29 . https://web.archive.org/web/20150929152711/http://www.nrc.gov/reading-rm/doc-collections/news/2015/15-057.pdf . dead .
  12. Web site: Electricity Data Browser . 2023-01-08 . www.eia.gov.
  13. Web site: Backgrounder on Emergency Preparedness at Nuclear Power Plants. Nuclear Regulatory Commission. 2019-12-22.
  14. Web site: 2011-04-14 . Nuclear neighbors: Population rises near US reactors . 2024-08-16 . NBC News . en.
  15. Web site: 2011-03-16 . What are the odds? US nuke plants ranked by quake risk . 2024-08-16 . NBC News . en.
  16. Web site: Archived copy . 2011-04-19 . https://web.archive.org/web/20170525170632/http://msnbcmedia.msn.com/i/msnbc/Sections/NEWS/quake%20nrc%20risk%20estimates.pdf . 2017-05-25 . dead .

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