noun
secondary cooling water
Technical term used in nuclear engineering, especially for the secondary coolant loop in a pressurized water reactor (PWR).
加圧水型原子炉では、二次冷却水が蒸気発生器で熱を受け取る。
In a pressurized water reactor, the secondary cooling water receives heat in the steam generator.
Primary cooling water directly cools the reactor core, while secondary cooling water is used in a separate loop to generate steam.
Compound of 二次 (secondary) + 冷却水 (cooling water). A straightforward technical term.