The federation's weapon management is extremely strict, especially for weapons within the living bases.
Five years ago, when Ji Xinghe had just arrived at the Alien Planet, Su He, who had been here before, told him about some tragic incidents that occurred in the Alien Planet living base. Those driven mad by the pressure of war and harsh living conditions not only harm themselves but also others.
Even though the current war pressure is significantly less than before, and the standard of living has improved as a result, with more psychologists exhausting themselves to the point of depression and madness, the control of weapons within the base must remain strict.
Under these circumstances, it's normal for Base Six not to have materials or equipment with nuclear radiation. And when nuclear fuel cells for the Mecha need to be 'procured' by the Independent Group themselves, Ji Xinghe is reluctant to dismantle them.