Random FactsCuriousOneOctober 06, 2015fatalities, incident, instant, Nuclear, only, reactor, SL-1, States, unitedComment The SL-1 Nuclear Reactor incident is the only one in the U.S. known to have instant fatalities Random FactsCuriousOneOctober 06, 2015fatalities, incident, instant, Nuclear, only, reactor, SL-1, States, unitedComment