noun
light-water nuclear reactor
Technical term for a nuclear reactor that uses ordinary water as both coolant and neutron moderator.
軽水原子炉は、世界で最も一般的な原子炉の形式です。
Light-water nuclear reactors are the most common type of nuclear reactor in the world.
Compound of 軽水 (light water) and 原子炉 (nuclear reactor).