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A nuclear reactor emits radiation. In a PWR reactor, if the reactor temprature is around 650 Degrees, The emission near the reactor core is 2.57 Roentgen. That is the amount of radiation a human is exposed to in around 20 Years.

There is also the dust, This dust if inhaled will cause cancer. If a Nuclear Powerplant explodes the story is different.

Lets take chernobyl NPP for instance.

The vincinity of the reacter core after explosion was 30,000 Roentgens per hour. That is 300 Sieverts per hour. That is enough to kill a man in 20 seconds. The fuel fragments that were realeased outward from the explosion the reactor had 15,000-20,000 Roentgens Pewr hour, And these fragments were laying on the ground after the explosion. Enough to kill a man in 30 seconds.

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