軽水炉 けいすいろ Meanings Noun light-water reactor See also: 重水炉 (じゅうすいろ). Kanji 軽 lightweight. Read as ケイ. 水 water. Read as スイ. 炉 furnace. Read as ロ. Words containing 軽水炉 加圧水型軽水炉 (かあつすいがたけいすいろ) pressurized light-water reactor Jinuma: Japanese Dictionary · Word lists