Manhattan Project National Historical Park, Part I: B Reactor » 3_4_DSCF2156_v1

Ball-drop scram switch at B Reactor console.

Ball-drop scram at B Reactor. Activating this switch would send millions of pea-sized boron carbide balls pouring into the reactor from above. The system was designed to provide safety even if thermal-mechanical damage to the core prevented the vertical safety rods from entering to effect shutdown.

Ball-drop scram at B Reactor console.

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