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The Watts Bar Nuclear Power Plant is a Tennessee Valley Authority (TVA) nuclear reactor used for electric power generation. It is located on a 1,770-acre (7.2 km²) site in Rhea County, Tennessee, near Spring City, between the cities of Chattanooga and Knoxville. Watts Bar Unit 1 is the most recent civilian reactor to come on-line in the United States. Watts Bar supplies enough electricity for about 650,000 households in the Tennessee Valley. 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 I has a winter net dependable generating capacity of 1,167 megawatts. Unit 2 has a projected capacity of 1,150 megawatts. ==Unit 2 construction project== Unit 2 was 80% complete when construction on both units was stopped in 1988 due in part to a projected decrease in power demand. In 2007, the 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 will create an estimated 250 permanent jobs. Unit 2 is expected to be the first new nuclear reactor to come online in the USA in nearly two decades and likely the last Generation II reactor. In response to severe damage to Japan's Fukushima-Daichi nuclear facility as a result of the 2011 Tohoku earthquake, the NRC issued 9 orders to improve safety at domestic plants. Two 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.〔 On April 5, 2012, TVA released a revised construction schedule and cost estimate for the Unit 2 project, stating that the new target start date for Unit 2 would be by December 2015. , the plant's cost estimate was . 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 forty-year operating license for Unit 2, marking the formal end of construction and allowing for the installation of nuclear fuel and subsequent testing. Operation is expected to begin in early 2016. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Watts Bar Nuclear Generating Station」の詳細全文を読む スポンサード リンク
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