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Sheldon Power Station is a coal-fired power station located near Hallam, Nebraska. It is the site of the former Hallam Nuclear Generating Station which operated from 1962 to 1964. ==Plant Information== Construction of Sheldon Station began in 1958--first as a combined nuclear and conventional facility. It was the pioneer sodium graphite nuclear power plant in the nation. The nuclear portion of the plant began operating early in 1963 and was at full power by July, 1963. However, this portion of the facility was ordered decommissioned by the former Atomic Energy Commission (AEC), now the Nuclear Regulatory Commission, in 1964. The AEC, which built the atomic plant, said it had garnered all the information it wanted about the sodium graphite plant and the former Consumers Public Power District, which cooperated in the project, said it didn't care to operate the nuclear portion of the facility any longer. The decommissioning work was done under the direction of Consumer's employees. It was up to the AEC to determine what to do with the components. Some of the nuclear equipment was shipped to other nuclear plants for reuse while other equipment was stored in Idaho and Washington for future AEC use. What couldn't be moved was buried within mammoth "burial vaults" of concrete and then the "leftovers," including the reactor core, were sealed below the surface of the earth. In addition to the nuclear portion of the plant, Sheldon Station has produced electricity for the Nebraska grid system since 1961 from a conventional coal- and gas-fired boiler. As the nuclear facility was being deactivated, a second generator was being installed and this was followed by a second conventional boiler. By July, 1968, all construction was completed and the plant was operating at its full 225,000 kilowatt capacity with two power generating units. Each of the two boilers supplies steam to drive its own electric generator. The plant's water supply comes from its own deep wells and the discharge of water from the plant is watched and carefully controlled to assure that it is not detrimental to the environment. To conserve water, cooling towers are used to dissipate the waste heat from the steam condenser thus permitting the water to be recycled. Major modifications were completed in 1974 at a cost of $4.2 million to accommodate switching the facility from using natural gas as the primary fuel to low sulfur coal. Involved was the construction and installation of enlarged coal storage and handling facilities necessary in making the transition to using only low sulfur coal. In addition, the installation of electrostatic precipitators to bring the facility into conformance with clean air requirements resulted in an expenditure of some $12.2 million. The precipitator on one stack was completed in December, 1975, and on the other in July, 1976. Installation of equipment to meet regulations on the chemical discharge of water had a price tag of some $7 million. In a concentrated effort to eliminate concern over the plant's effect on the environment, NPPD states flatly and simply that Sheldon Station will meet all federal and state air pollution and water quality control standards and regulations. 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「Sheldon Power Station」の詳細全文を読む スポンサード リンク
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