In this case, the first experimental atomic reactors would have run away to a dangerous and messy "prompt critical reaction" before their operators could have manually shut them down (for this reason, designer Enrico Fermi included radiation-counter-triggered control rods, suspended by electromagnets, which could automatically drop into the center of Chicago Pile-1).
U tom slučaju, prvi eksperimentalni atomski reaktori bi otišli izvan kontrole u opasne i zbrkane „brze kritične reakcije“ pre nego što bi njihovi operatori mogli da ih ručno zaustave (iz tog razloga, dezajner Enriko Fermi je uveo radijacijom kontra pobuđene kontrolne šipke, suspendovane elektromagnetima, koje mogu da automatski padnu u centar Čikago gomile-1).