i found this on German Wikipedia
in October 1965 experiments start for a nuclear power An-22
Build aircraft 01-06 was used for radiation shield test
Build aircraft 01-07 had the Reactor on board
in September 1972 01-07 began 23 test flights near Semipalatinsk
under codename "Stork"...
the Bell Helicoptere Corporation designed a new concept
for atomic-powered VTOL transport helicopter,it had 300 ft
length,500,000 1b weight and estimated speed of 200 mph,
it was look like to me as flying ship.