translation.en: 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. These reactors operate at essentially atmospheric pressure, so there's no inclination for the fission products to leave the reactor in the event of an accident.
translation.zh: 传统的反应堆，像那些增压水反应堆 或者沸水反应堆，都会用到温度很高的水 并且压力很高，这就意味着， 一旦遇到事故， 只要这个不锈钢承压容器有一点点缺口， 冷冻剂就会从堆芯逸出。 而我的这些反应堆基本上是在大气压下运行的， 所以在事故中，那些裂变产物 不大会离开反应堆。