During a late night safety test which simulated power-failure and in which safety systems were deliberately turned off, a combination of inherent reactor design flaws, together with the reactor operators arranging the core in a manner contrary to sanity.
Comments
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The reactor exploded, not melted.
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well, they were. they bypassed the safety to test the reactor in an unconventional way. this caused the reactor to melt down.
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+1 by the way
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reactor operators were not at fault.