Nuclear weapons and nuclear reactors do both leverage atomic nuclei, but they are pretty darn different. Dismantling nuclear weapons is unlikely to cause a radiological accident. Before nuclear detonation, nuclear weapons aren't all that radioactive. Nothing like post detonation.

You probably know this, but nuclear reactors, despite how well known various incidents are, are still among the safest, cleanest, and lowest carbon ways to make electricity we know [1]

[1] https://ourworldindata.org/safest-sources-of-energy