cross-posted from: https://piefed.social/c/noncredibledefense/p/1490862/the-correct-response
this post was submitted on 04 Aug 2026
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You're right!
Assuming 90% enriched uranium core, given a half life of 704,000,000 years, and a minimum enrichment of 20% when using neutron reflectors, explosive compression, and tritium dosing, the average nuclear core will decay enough to be unusable in approximately 1.5 billion years.
The parts that need maintenance are the rocket fuel, the explosive charges used to compress the core, and replacing the tritium. On a time scale of billion+ years, you'll also probably have to replace...well, everything else.
Of course, modern nukes sometimes use plutonium, which only has a half life of about 24,110 years. Those cores should be damn near unusable about 10k years after the events of warhammer 40k. Maybe they should make a warhammer 52K that runs into that issue.
Of course, cores that fail to detonate simply become radioactive shrapnel. This is colloquially known as a "dirty bomb". Not very kaboom, but very "help! I've grown a third arm!"