So here is my current thoughts. Before the War Morrow was producing He3 as a byproduct of various types of research and production operations and was carefully harvesting it. This was them placed in all the operational reactors, each of which had an 18 month store of material. Each Bolt hole also had a reactor for cryogenic maintenance, radio watch and to start the vehicle reactors during thaw out. This reactor had its own supply of He3 and there was a third He3 tank that was to refuel the vehicles after their first tank was used up. This third tank was connected to the bolt hole tank as both a back up and a way that if the bolt hole tank was not used up the fuel could be saved for use. The bolt hole had a low "cruise" power setting so 18 months of vehicle fuel (18 months being set at 12 hours full capacity/12 hours half capacity per day for 540 days) will suffice for a much longer period for the bolt hole. Since Bolt Holes were designed and fueled for around sixty years 1960-2020 (and when equipment was upgraded in holes they were all refueled back to that standard). This means that the bolt hole reactors have used their primary tanks and instead of having extra He3 to shunt to the spare fuel tank for the vehicles they are well on their way to burning through that fuel as well.
The Hot Fusion plants at the main bases and especially Prime Base all produce He3 as a byproduct. This was a design feature and all the He3 is captured for use by the cold generators. Even the low power at which these bases are operating in their "standby" mode they have generated a lot of He3. This is patiently waiting in the bowels of various bases.
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