given that the "fuel" was set to be replaced every 5,000 miles, i'm going to guess that it was going to be reused, but likely the need for weapons grade plutoni

given that the "fuel" was set to be replaced every 5,000 miles, i'm going to guess that it was going to be reused, but likely the need for weapons grade plutonium and the amount of shielding required made it not feasible to even think that far, so no idea what the end product would have entailed.