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General Electric's BWR product line of Boiling Water Reactors represents the designs of a large percent of the fission reactors around the world. ==History== The progenitor of the BWR line was the 5MW Reactor at the Valiecitos Boiling-Water reactor in 1957. *Elk River - 5x5 fuel rod bundle (ge bwr?) *Lacrosse - 10x10 fuel rod bundle (ge bwr?) *BWR Type 1: In 1955 GE developed this design into the 180MW Dresden 1(6x6,7x7) reactor, embodying GE's BWR/1 design. External or internal steam separation. GE would further develop this design with Big Rock Point(9x9, 11x11 12x12), and Humboldt Bay(6x6, 7x7), but sharing the BWR1 classification. These three experimental designs used fuel rod bundles in 6x6, 8x8, 9x9, 11x11, 12x12, but GE's 9x9 bundle later used in type 2-6 reactors is different from the one used in the Type 1 era.〔(【引用サイトリンク】url=http://web.ornl.gov/info/reports/1989/3445603005192.pdf )〕 An example of designs later classified as Generation I reactor Humboldt Bay and Dodewaard had natural circulation. Type 1 was the first design with internal steam separation. It also had an isolation condenser, and pressure suppression containment.〔http://www.powermag.com/the-evolution-of-the-esbwr/?printmode=1〕 *BWR Type 2: 1963〔(【引用サイトリンク】url=http://www.edf.com/fichiers/fckeditor/Commun/Innovation/conference/BWRsbasics_va.pdf )〕 500MW〔 〕 Included a large direct cycle. 5 recirculation loops. This design, as well as types 3-6 would later be classed as Generation II reactors for their increased scale, and their design as commercially viable, profitable, long life reactors, designs that would become the foundation for the improved Generation III. Oyster Creek had a large direct cycle.〔 *BWR Type 3: Introduced in 1965 800MW〔 (Dresden 2 & 3) Improved ECCS with spray and flood. First jet pump use (internal). 2 recirculation loops. Dresden 2 and Brown's Ferry had improved ECCS, spray and flood. They also had a reactor core isolation cooling system.〔 *BWR Type 4: Introduced in 1966 1,100MW (Decatur Al) Increased power density 20%. *BWR Type 5: Introduced in 1969 (Moscow OH) Improved ECCS valve flow control. Recirculation flow control valves. *BWR Type 6: Introduced in 1972, 1,390MW transitioned from 7x7 to 8x8 fuel bundle with longer, thinner rods, improved compact jet pumps with higher circulation and increased capacity of the steam separators and dryers, added fuel bundles, and increased output, reduced fuel duty, improved eccs, introduced a solid-state nuclear system protection system and reduced the size of the control room. A 1.22GW electrical BWR6 has 177 control rods and 748 fuel assemblies for a total of 46,376 fuel rods. It had a gravity containment flooder, and they had options for a compact control room, and only Clinton took the solid state nuclear system protection system.〔 *ABWR: Higher safety margins, no external recirculation loops, reactor internal pumps. It also has fine motion control rod drives. *ESBWR: Passive safety, natural circulation (no loops or pumps), 1,600MW It has a gravity flooder, isolation condenser, and passive containment cooling.〔 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「GE BWR」の詳細全文を読む スポンサード リンク
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