scram

During scram operation, a scram signal de-energizes the inlet and outlet scram valves. The outlet scram valve vents the volume above the drive piston to a scram dump tank. The inlet scram valve supplies scram pressure obtained from an accumulator to the under side of the vented piston.

Each room housing a radiation source has a red-buttoned "scram" switch on the wall. One touch of the switch and all equipment stops abruptly.