緊急 きんきゅう炉心 ろしん冷却 れいきゃく装置 そうちでした
kinkyūroshinreikyakusōchideshita

Noun
Desu Copula

The polite past form of 緊急炉心冷却装置

1. Was an emergency core cooling system.

Past/Perfective
Polite