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Xantro-Creating a sustained critical chain reaction is an exceedingly complicated process.
Ridiculous.
All you need is a large enough piece of fissionable material. NO 'process' needed.
Next.
-- Godot.
No, a sustained critical chain reaction is hard to maintain, the very process blows itself apart.
If you really think that just bringing enough fissionable material together will just create a sustained critical chain reaction, you are far more stupid than I thought.
A large pile of fissionable material of the proper type, could start a chain reaction, which would very quickly blow the mass apart. Exactly as happened in your example.
What can't happen is the sustained critical chain reaction which would be required for a nuclear detonation.