Control Room

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Various other gauges and recorders were monitored in the control room. One important instrument was the fuel slug rupture monitor. This system monitored for slug jacket failures by detecting abnormal radiation (beta activity) in the pile outlet water. Eight beta-sensitive ionization chambers were installed in sample rooms near the rear face of the pile. Outlet water sample lines were run from the rear crossheaders and discharge risers through an annulus in a chamber via a solenoid valve that operated on a time cycle. The time cycle allowed short half-life activity to decay, so that they would not be confused with the longerlived activity. Other control room instruments included: