Sequoyah Nuclear Plant

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The Sequoyah Nuclear Plant is a nuclear power plant located on Script error: No such module "convert". located Script error: No such module "convert". east of Soddy-Daisy, Tennessee, and Script error: No such module "convert". 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,[1] 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.[2] 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.[1]

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.[3][4] Unit 2 was licensed on September 15, 1981, and began operation on June 1, 1982.[5][4] 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.[6] 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.[7] 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.[7] On March 22, 1988, TVA was authorized by the NRC to restart both Sequoyah units.[8] Both reactors returned to service later that year.[9]

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.[10] 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.[1]

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[11]
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual (Total)
2001 1,715,621 1,547,274 1,688,182 1,652,227 1,691,701 1,626,029 1,651,666 1,651,496 1,618,505 1,416,882 989,416 1,700,857 18,949,856
2002 1,712,498 1,548,129 1,712,696 1,179,383 1,020,499 1,588,579 1,578,618 1,642,669 1,605,861 1,691,656 1,648,005 1,566,979 18,495,572
2003 1,538,148 1,549,716 889,060 772,530 843,504 1,109,805 1,668,475 1,585,871 1,602,956 1,715,357 1,079,412 1,248,935 15,603,769
2004 1,194,378 1,622,496 1,580,743 1,670,244 1,716,912 1,643,689 1,690,048 1,685,688 1,644,212 1,509,633 1,061,493 1,735,832 18,755,368
2005 1,734,248 1,464,350 1,736,755 1,362,460 892,497 1,653,280 1,694,189 1,687,558 1,635,444 1,716,106 1,678,363 1,743,903 18,999,153
2006 1,682,219 1,570,914 1,604,291 1,042,998 1,274,216 1,647,754 1,678,165 1,664,688 1,633,330 1,716,109 1,511,763 974,232 18,000,679
2007 1,677,855 1,571,210 1,673,450 1,668,096 1,723,137 1,654,059 1,691,561 1,676,085 1,534,271 898,508 1,143,344 1,739,109 18,650,685
2008 1,679,170 1,626,605 1,735,160 1,618,395 947,397 1,504,251 1,681,616 1,657,270 1,639,447 1,715,045 1,371,138 1,741,814 18,917,308
2009 1,740,512 1,569,882 1,448,218 821,378 1,451,044 1,614,963 1,658,103 1,666,440 1,625,477 1,530,500 910,663 1,717,356 17,754,536
2010 1,718,954 1,553,344 1,651,286 1,631,962 1,611,012 1,487,684 1,656,024 1,637,160 1,510,126 834,089 1,136,914 1,572,209 18,000,764
2011 1,719,514 1,553,966 1,714,720 1,621,161 1,319,880 946,454 1,572,796 1,578,718 1,582,198 1,699,007 1,662,103 1,717,676 18,688,193
2012 1,718,158 1,490,254 810,376 1,567,210 1,583,774 1,622,332 1,654,948 1,585,666 1,621,590 1,231,806 834,276 865,240 16,585,630
2013 1,530,558 1,393,076 1,740,503 1,662,106 1,745,413 1,641,303 1,690,971 1,680,336 1,557,244 1,109,768 1,054,061 1,720,672 18,526,011
2014 1,723,956 1,557,221 1,719,014 1,596,760 1,083,378 1,133,896 1,680,276 1,673,600 1,625,520 1,704,334 1,668,578 1,725,858 18,892,391
2015 1,715,648 1,559,658 1,261,819 1,022,368 1,233,518 1,633,998 1,481,601 1,454,372 1,437,850 1,669,386 1,067,578 973,526 16,511,322
2016 841,395 910,071 1,718,696 1,654,185 1,535,866 1,625,351 1,655,503 1,644,646 1,605,992 1,688,908 1,514,545 847,450 17,242,608
2017 1,300,005 1,576,214 1,717,976 1,537,391 848,472 1,456,860 1,675,580 1,665,170 1,630,554 1,446,387 1,664,360 1,722,330 18,241,299
2018 1,723,352 1,506,345 1,718,484 987,565 1,482,122 1,636,994 1,664,194 1,666,828 1,607,022 1,550,238 866,069 1,294,536 17,703,749
2019 1,720,494 1,554,495 1,717,933 1,557,931 1,702,708 1,636,150 1,675,144 1,576,388 1,394,369 1,017,551 890,814 1,620,642 18,064,619
2020 1,623,312 1,612,766 1,694,162 1,057,335 1,438,839 1,642,519 1,655,788 1,644,477 1,626,036 1,709,727 1,667,841 1,726,387 19,099,189
2021 1,726,934 1,559,132 1,723,128 1,069,104 1,196,380 1,640,426 1,678,000 1,560,825 1,520,846 869,782 1,385,317 1,724,938 17,654,812
2022 1,725,344 1,558,934 1,722,122 1,662,014 1,707,980 1,413,209 1,667,490 1,667,082 1,632,618 1,371,240 972,084 1,727,182 18,827,299
2023 1,727,636 1,558,590 1,279,805 1,228,445 1,709,744 1,647,568 1,682,352 1,670,278 1,623,820 1,705,108 1,667,966 1,726,284 19,227,596
2024 1,724,688 1,615,608 1,417,869 819,785 1,681,828 1,630,998 1,334,890 596,777 706,552 202,606 832,268 863,408 13,427,277
2025 860,283 779,347 862,137 831,153 --

Surrounding population

The NRC defines two emergency planning zones around nuclear power plants: a plume exposure pathway zone of Script error: No such module "convert". radius (concerned primarily with exposure to, and inhalation of, airborne radioactive contamination), and an ingestion pathway zone of about Script error: No such module "convert". radius (concerned primarily with ingestion of food and liquid contaminated by radioactivity).[12]

The 2010 U.S. population within Script error: No such module "convert". 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.[13] The 2010 U.S. population within Script error: No such module "convert". was 1,079,868 (increase of 13.8 percent).[13] Cities within 50 miles include Chattanooga (14 miles to city center).[13]

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.[14][15]

See also

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References

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  1. ↑ a b c Securities & Exchange Commission filing. Available at https://www.sec.gov/
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External links

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