A fission reactor works by maintaining a controlled nuclear chain reaction.
一座裂变反应堆需要在可控的核裂变中运转。
Blowers move helium gas through the reactor and over the pebbles, where nuclear fission releases large amounts of energy, heating up the helium.
鼓风机将氦气吹过反应堆，经过核裂变释放出大量能量的小球，加热了氦。
Uranium 235 — the fuel inside a nuclear reactor — undergoes nuclear fission.
铀235——反应堆中的燃料——经过核裂变。
Fast-moving neutrons are produced by fission reaction in a nuclear reactor. Water is commonly used to moderate and control the speed of neutrons.
核电站的核反应堆中，核裂变会产生高速移动的中子，通常是用水去阻隔及控制中子的移动速度。
Plutonium is produced during nuclear fission, so is present in all reactor cores - the longer the fuel has been there, the more plutonium will be present, up to about 1%.
钚是在核裂变过程中产生的，所以在所有的反应堆中都存在---燃料在反应堆内烧的时间越长，产生的钚就越多，最高可以到1%。
Plutonium is produced during nuclear fission, so is present in all reactor cores - the longer the fuel has been there, the more plutonium will be present, up to about 1%.
钚是在核裂变过程中产生的，所以在所有的反应堆中都存在---燃料在反应堆内烧的时间越长，产生的钚就越多，最高可以到1%。
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