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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Organically moderated and cooled reactor ： ウィキペディア英語版 Organically moderated and cooled reactor The organic moderated and cooled reactor (OCR) was an early power reactor concept studied in the formative years of nuclear power by the United States Atomic Energy Commission and others around the world. The concept reactor was very similar to light water reactors (LWRs) in fuel element and reactor core design, but used hydrocarbon as a coolant and neutron moderator in lieu of water. The hot organic coolant was pumped through secondary heat exchangers to boil water and generate steam to run a turbogenerator. As in LWRs, the fuel could be slightly enriched uranium dioxide, though other fuel types were considered. ==History== Though this reactor type has been the subject of extensive study, no large power plants using organic coolant have been built. Canada operated a 60 MWe heavy water organic cooled reactor from 1965 to 1985. A 45.5 MWe demonstration reactor was operated for a brief period in Piqua, Ohio and was the only power reactor of its kind ever constructed in the United States. The Piqua Nuclear Generating Station was shut down in 1966 due to an instrument scram. In the process of resuming operation, it was discovered that two control rods did not move freely within their guide tubes and four nuclear fuel elements required abnormally high force to remove. Subsequently, these fuel elements would not reseat. A complete unloading of the core showed that large carbonaceous deposits were present on the fuel, control rods, and support structures throughout the core region. These deposits interfered with the movement of the control rods, and altered the heat transfer characteristics of the fuel. As a consequence, the Atomic Energy Commission decided to end the Piqua experiment and the reactor was dismantled. 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「Organically moderated and cooled reactor」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.