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  1. The fissile fuel is packaged in the bomb as a subcritical mass.
  2. The fusing system detects the preset firing condition.
  3. A firing pulse is sent from the fusing system to the rapid assembly system.
  4. The rapid assembly system uses explosives to repackage the fissile fuel as a supercritical mass.
  5. A neutron source fires through the supercritical mass, initiating the chain reaction.
  6. The chain reaction increases exponentially until the resulting explosion disassembles the fissile fuel back to a subcritical mass.
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12y ago

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