So traditional reactors like a pressurized water reactor or boiling water reactor, they're very, very hot water at very high pressures, and this means, essentially, in the event of an accident, if you had any kind of breach of this stainless steel pressure vessel, the coolant would leave the core.
加圧水型炉 沸騰水型原子炉といった これまでの原子炉は非常に高温の水を 高圧下で使います すなわち 事故が起こったとき もし ステンレス鋼圧力容器が破損したら 冷却剤が 炉心から流れ出すのです