PRM 2025 EXAM QUESTIONS AND ANSWERS ALL CORRECT

PRM 2025 EXAM QUESTIONS AND ANSWERS ALL CORRECT What kind of detectors are Off Gas Post-Treatment Rad Monitors? Where are samples pulled from? - Answer-• detector is a gamma sensitive scintillation detector • Samples downstream of the OG System charcoal adsorber beds. What kind of detectors do Carbon Bed Vault Radiation Monitoring System use? - Answer-a gamma sensitive Geiger Mueller tube Integral Sr-90 source ("bug" source) provides on-scale reading at background radiation level. Indicator and Trip Unit - Answer-consists of an amplifier, two trip units and a meter in a drawer on the H13-P635 back panel. HIGH Rad actuates the upscale trip unit (red light) on the instrument drawer and actuates alarms on N62-P600 and locally (the Auxiliary Trip Unit located outside the Carbon Bed Vault in the OG Filter Building actuates a klaxon horn and warning lights). What kind of detectors do VR Exhaust Plenum Rad Monitors use? - Answer-• a gamma sensitive Geiger Mueller tube • Detectors are located upstream of VR exhaust isolation dampers AB 786' What are the VR exhaust plenum rad detector divisions? - Answer-• 'A' and 'B' meters (Div 1, outboard) • 'C' and 'D' meters (Div 2, inboard) What happens on a VR HI HI Rad (8 mR/hr)? - Answer-Div 1 (A and B) or Div 2 (C and D) High-High rad initiates Group 4 PCIS. For clarity, if only Div 1 (A & B) monitors initiate, ONLY the outboard damper will close. What kind of detectors do Fuel Pool Vent Exhaust Plenum Rad Monitors use? Where are they located? - Answer-• a gamma sensitive Geiger Mueller tube located 820 RB by SBLC What are the FC exhaust plenum rad detector divisions? - Answer-• 'A' and 'B' meters (Div 1, outboard) • 'C' and 'D' meters (Div 2, inboard) Div 1 (A and B) or Div 2 (C and D) High-High rad initiates Group 4 PCIS. What kind of detectors do Liquid Process Radiation Monitoring (PRM) System use? - Answer-gamma sensitive scintillation detectors Where do we use Liquid PRMs? - Answer-WS (AB 692') WR (RB 761') RHR WS 'A' HX effluent (RB NW 710') RHR WS 'B' HX effluent (RB SE 710') Radwaste Effluent (AB 692') What kind of detectors do Radwaste Effluent Monitoring System use? - Answer-• gamma sensitive scintillation detectors • Obtains samples from the Discharge Piping between the isolation valve (0WL067) and the Lake Blowdown line piping. What signals closes the Lake Blowdown Radwaste Discharge FCV (0WL067) and trips the Radwaste Discharge Pumps 0(1)2WF05P? - Answer-• Low sample flow ( 3 gpm) • High-High rad • INOP trip What kind of detectors do VC HVAC Air Intake Monitors use? - Answer-4 GM tube detectors for each VC system air intake plenum • A and B detectors input to Trip System 1 • C and D detectors input to Trip System 2 What happens on an Upscale trip (6 mr/hr) on both VC detectors in either Trip System? - Answer-• Closes VC normal intake (minimum outside) air dampers • VE/VC purge supply and exhaust dampers are interlocked closed • Aligns VC EMU: fan starts and EMU inlet/outlet dampers open What is the purpose of the Station Ventilation Stack Rad Monitors (SVS WRGM)? What type of detectors does it use? - Answer-• beta scintillation detectors • Continuously monitors, indicates, and records Noble Gas releases from the Station • Provides means to sample/analyze for Particulates, Iodine, and Noble Gas • Initiates an alarm of GSEP conditions based on the release rates • Provides isokinetic sampling (with auto flow control) for representative particulate and iodine sampling What does Isokinetic mean? - Answer-means air velocity entering the sampling nozzle equals the air velocity in the stack at that point What is Nominal sample flow through the probe? - Answer-Nominal sample flow through the probe of 2.0 scfm is based on a 1 x 106 scfm stack gas flow rate N62-P600-B304 "STA VENT STACK WIDE RANGE RAD HI" alarm setpoints: - Answer-• 2 x 104 μci/sec: Yellow ALERT on SVS WRGM RM-23 for effluent channel lights up • 6. 1 x 105 μci/sec: Red HI-HI light on SVS WRGM RM-23 for effluent channel lights up When will the low range detector not operate? - Answer-The low range detector will not operate while using the grab sample mode.