Nuclear-powered submarine mishaps include the K-19 reactor accident ( 1961 ) , the K-27 reactor accident ( 1968 ) , and the K-431 reactor accident ( 1985 ) .
Nuclear-powered submarine mishaps include the Soviet submarine K-19 reactor accident ( 1961 ) , the Soviet submarine K-27 reactor accident ( 1968 ) , and the Soviet submarine K-431 reactor accident ( 1985 ) .