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The advanced boiling water reactor (ABWR) is a Generation III boiling water reactor. The ABWR is currently offered by GE Hitachi Nuclear Energy (GEH) and Toshiba. The ABWR generates electrical power by using steam to power a turbine connected to a generator; the steam is boiled from water using heat generated by fission reactions within nuclear fuel. Boiling water reactors (BWRs) are the second most common〔http://world-nuclear.org/NuclearDatabase/rdResults.aspx?id=27569〕 form of light water reactor with a direct cycle design that uses fewer large steam supply components than the pressurized water reactor (PWR), which employs an indirect cycle. The ABWR is the present state of the art in boiling water reactors, and is the first Generation III reactor design to be fully built, with several reactors complete and operating. The first reactors were built on time and under budget in Japan, with others under construction there and in Taiwan. ABWRs are on order in the United States, including two reactors at the South Texas Project site. The standard ABWR plant design has a net electrical output of about ( of thermal power). ==Certifications and approvals== In 1997 it was certified as a final design in final form by the U.S. Nuclear Regulatory Commission, meaning that its performance, efficiency, output, and safety have already been verified, making it bureaucratically easier to build it rather than a non-certified design. In 2013, following its purchase of Horizon Nuclear Power, Hitachi applied to the UK Office for Nuclear Regulation for assessment, which is likely to take from two to four years. 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「Advanced boiling water reactor」の詳細全文を読む スポンサード リンク
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