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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 Nuclear entombment ： ウィキペディア英語版 Nuclear entombment Entombment (also referred to as safe enclosure) of a nuclear reactor is a method of nuclear decommissioning in which radioactive contaminants are encased in a structurally long-lived material, such as concrete, that will last for a period of time to ensure the remaining radioactivity is no longer of significant concern. Entombment is part of one of three various ways to decommission a nuclear power plant including: dismantling, safe enclosure and entombment. Nuclear entombment is the least used of the three options. The use of nuclear entombment is more practical for larger nuclear power plants that are in need of both long and short term burials. Entombment is used as a case by case basis because of its major commitment with years of surveillance and complexity until the radioactivity is no longer a major concern, permitting decommissioning and ultimate unrestricted release of the property. ==Procedure== The procedure of entombment is a very time extensive process. The simplest of the procedures is entombing the Radioactive waste source at the site itself. The waste is incased in a concrete barrier and is then surrounded by a clay mixture, sand/gravel and then the soil in the area of the site.〔Seitz, R. R. (2002). Entombment using cementitious materials: design considerations and international experience. Retrieved from http://www5vip.inl.gov/technicalpublications/Documents/3314560.pdf〕 The use of many layers help reduces and prevent the concern of nuclear leakage. A waste disposal facility in El Cabril Spain uses a multi-concrete barrier concept. The concept includes placing the radioactive waste drums inside concrete boxes and placing those boxes inside a reinforced concrete vault. The Vault is then sealed with a waterproof coating to prevent any hazardous liquid from escaping the drums. 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「Nuclear entombment」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.