30 to 40%

40 to 60%

60 to 70%

75 to 90%

It produces more fuel than it consumes.

It requires highly enriched fuel.

It requires liquid sodium metal as moderator.

all of the above

Yes

No

Unknown

None

by increasing the contents of U₂₃₅

by slowing down fast neutrons so that U₂₃₅ fission continues by slow neutron

by increasing the contents of U₂₃₅ and by slowing down fast neutrons so that U₂₃₅ fission continues by slow neutron

none of these

equal to

less than

greater than

none of these