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How are the concerns any different than for a nuclear powered sub, carrier or other ship. The also could be attacked causing an issue with potential for various radioactive isotopes to leak.

However, no controversy there....

I don't really see the need for controversy we already have mobile reactors they just are in ships and subs.

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In the case of a ship or sub, in the event of both catastrophic failure, or even a material leak, its likely going to end up in the ocean. Water is an excellent radiation shield (though I guess it doesn't matter much, since no one would be around), and even a materials leak gets diluted until its not an immediate risk. RIP ocean microbes though

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