boiling water reactor

Japanese: boiling water reactor（英語表記）boilingwaterreactor

... refers to a nuclear reactor that uses pressurized light water as a coolant and moderator, and uses low-enriched uranium or uranium oxide mixed with a small amount of plutonium as fuel. There are boiling water reactors (abbreviated as BWR), which allow the coolant to boil and directly use the steam generated (direct cycle), and pressurized water reactors (abbreviated as PWR), which do not allow the coolant to boil and direct the water heated to a high temperature in the core to a steam generator, where the heat is transferred to another water to generate steam (indirect cycle). It quickly became popular because it uses water, which humans are familiar with, as the main material, and because the United States, a country with a large market, was a country where giant electrical manufacturers General Electric and Westinghouse competed with two slightly different types of reactors, pressurized water reactors and boiling water reactors, aiming to put them into practical use, and this spread to other countries as well. ...

From [Nuclear Reactor]

…Boiling water reactor: A nuclear reactor that uses boiling water as a coolant and moderator. It is sometimes abbreviated to BWR. A type of light water reactor.

*Some of the terminology that refers to "boiling water reactor" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…冷却材を兼ねた減速材に加圧した軽水を用い，低濃縮ウランもしくは若干のプルトニウムを混合したウランの酸化物を燃料として用いる原子炉をいう。冷却材に沸騰を許し，生成する水蒸気を直接利用する(直接サイクル)沸騰水型原子炉boiling water reactor(略称BWR)と，冷却材に沸騰を許さず炉心で高温になった水を蒸気発生器に導き，そこで別の水に熱を伝えて蒸気を発生させる(間接サイクル)加圧水型原子炉pressurized water reactor(略称PWR)とがある。人類が使いなれた水を主材料に使っていること，アメリカという大きな市場をもつ国で，ゼネラル･エレクトリック社とウェスティングハウス社という巨大電機メーカーが，加圧水型原子炉と沸騰水型原子炉という二つのやや異なる型式で競争しつつ実用化を目指したことにより急速に普及し，これが各国へも波及した。…