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SAM and CAM channels are checked once per week per the startup portion of UWNR 117 , usually before the first startup of the week. Shutdown (performed only for maintenance) is also covered by UWNR 117. Any shutdowns or maintenance on the equipment must be noted on the recorder charts at the console. Alarm responses are covered in UWNR 155. Remember that SAM high (>4E-4 :Ci/ml) readings on gaseous activity when on the high range (in alarm condition) is an entry condition for the Emergency Plan and Emergency Procedures.
The detector for this channel (Figure 2)is a fission counter. A fission counter is a N-filled counter with a U-235 lining operated as a pulse counter in the ion chamber region. An incoming thermal neutron causes the U-235 (n,f) reaction, and the ionization caused by a highly ionized fission fragment results in a quite large negative pulse on the center electrode. This pulse is much larger than those caused by either gammas from the core or the alphas which result from the decay of uranium. Even if several gammas "pile up" in the detector, as in high gamma fluxes, the neutron-induced pulse is still substantially bigger than the gamma pulses.
06/99 CONTROLS & INSTRUMENTATION V MODE SWITCH AND INTERLOCK Scope: Key switch positions. Mode switch interlocks for pulse, square wave, and manual and automatic operation. ) OFF: Power cannot be made available to magnets or solenoid for transient rod, scram can't be reset. Control element position indicator lights are off, Control element drives may be inserted but not withdrawn, Annunciators which do not have great significance if the reactor is not being operated are defeated. (Scram, thermal column door not fully closed, bridge entrance or high rad area open, high voltage failure, SAM/CAM annunciators, radiation monitor downscale failure, short period) ON: Control element drives can be withdrawn if permissives are met, Shim-Safety blade drives run in automatically if a relay scram is present, Scram can be reset, power can be made available to magnets and transient rod solenoid.