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Bradwell nuclear power station is a partially decommissioned Magnox power station located on the Dengie peninsula at the mouth of the River Blackwater, Essex. ==History== Construction of the power station, which was undertaken by a consortium involving Clarke Chapman, Head Wrightson, C. A. Parsons & Co., A. Reyrolle & Co., Strachan & Henshaw and Whessoe and known as the Nuclear Power Plant Company ('NPPC'),〔(The UK Magnox and AGR Power Station Projects )〕 began in December 1957 and electricity generation started in 1962. It had two Magnox reactors with a design output of 300 (MW) of net electrical output although this was reduced to 242 megawatts (MW) net electrical in total.〔(【引用サイトリンク】title=Bradwell - Facts and figures )〕 as a result of the discovery of breakaway oxidation of mild steel components inside the reactor vessel. Its peak output, achieved in the early 1960s, was nearly 10% above the design value. On a typical day it could supply enough electricity to meet the needs of three towns the size of Chelmsford, Colchester and Southend put together. The reactors were supplied by The Nuclear Power Group ('TNPG') and the 9 turbines & 12 Gas Circulators by C. A. Parsons & Co.〔(Nuclear Power Plants in the UK - England )〕(6off 52MW Main Turbines supplying power to the grid, 3off 22.5MW Auxiliaries Turbines, one for each reactor for driving the gas circulators with one standby auxiliary turbine). Bradwell was built on the edge of a former World War II airfield, one and a half miles from the Essex coastline. Its location was deliberately chosen as the land had minimal agricultural value, offered easy access, was geologically sound and had an unlimited source of cooling water from the North Sea. In 1969, a new Honeywell 316 was installed as the primary reactor temperature monitoring computer; this was in continuous use until summer 2000, when the internal 160k disk failed. Two PDP-11/70s, which had previously been secondary monitors, were moved to primary. In 1999, it was announced that the station would cease operation in 2002 – the first UK station to be closed on a planned basis. On 28 March 2002 Lord Braybrooke, Lord Lieutenant of Essex, unveiled a plaque to mark the cessation of electricity generation and the beginning of the decommissioning stage. 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「Bradwell nuclear power station」の詳細全文を読む スポンサード リンク
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