沸騰 ふっとう すい がた原子 げんし じゃありませんでした
futto usuiga tagen shiroja arimasendeshita

Noun
Desu Copula

The polite, past negative form of 沸騰水型原子炉

1. Was not a boiling water reactor.; Was not of the boiling water reactor type.

Past/Perfective
Negative
Polite
Terminal Form