高速 こうそく増殖 ぞうしょく じゃありませんでした
kōsokuzōshokurojārimasendeshita

Noun
Desu Copula

The polite, past negative form of 高速増殖炉

1. Was not a fast breeder reactor.; Was not a fast-breeding reactor.

Past/Perfective
Negative
Polite
Terminal Form