The nuclear-powered version of H2, also referred to as H2N (N for nuclear), had a highly diversified range of uses.
First was the envisioned Earth-Moon round trip. The base's lack of confidence in meeting the ambitious targets set by NAPE on schedule meant that H2N served as a backup for the XN90 spacecraft, capable of launching directly from Earth to carry out lunar missions.
Second, like the H2M, it assisted in the construction tasks for the Forward Space Station. Other than having different power sources, it could play the same role as the H2M.
Third, it was imagined as an unmanned transportation tool within the Solar System.
The H2N's maximum takeoff mass from ground was 135 tons, but in space, it could further load cargo or attach external payload bays to reach a mass of 180 to 300 tons. With three A100 engines driving it, only 50 tons of fuel would be needed to travel to Mars.
