SQ- Radiation Monitoring Flashcards
The SQ system is composed of what three subsystems?
The Safety Related Radiation Monitoring System (SRMS)
The post-accident radiation monitoring system (PAMS)
Digital Radiation Monitoring System (DRMS)
also contains the display and control units in the main control room and the RMS/effluents office
data is also sent to ERFDADS
Regarding the SQ system, what does PAMS provide?
Long term accident and post-accident monitoring of effluent gases and particulates for condenser effluent and plant vent
It informs operators of abnormal radiation increases in containment penetration areas, main steam line area, control room and other plant areas
(some are tech spec related)
In the SQ system, what does DRMS provide?
Represents the balance of radiation monitoring system and provides information on process, effluent, and area radiation levels
What types of monitors are used in each of the SQ subsystems?
Quality class QAG monitors
What does SRMS provide? What types of monitors does it use?
Actuation signals for the ESF isolation systems
Provides technical specification or technical specification related monitoring and control functions
Contains only quality class Q radiation monitors
Regarding the SQ system, what automatic feature is associated with Containment Building Atmosphere Monitor, RU-1?
Isolation valves at the penetration automatically shut to isolate the monitor from pressure and temperature transients following a LOCA.
The valves close on a CIAS
In the SQ system, what automatic feature is associated with Control Room Ventilation Intake Monitors, RU-29 and RU-30?
These radiation monitors track the noble gas concentrations in the control room air intake.
The primary function of these monitors is to provide ESF actuation on high-high alarm activating the control room essential filtration units. (CREFAS)
In the SQ system, what is the automatic feature associated with Fuel Building Ventilation Exhaust Monitor, RU-145?
This monitor forms the low range portion of the fuel building ventilation exhaust post-accident monitor.
The primary function of this monitor is to provide ESF actuation on high-high alarm isolating the normal fuel building ventilation and initiating the essential ventilation system. (FBEVAS. This signal cross-trips with CREFAS)
In the SQ system, what is the automatic feature associated with Power Access Purge Area Monitors, RU-37 and RU-38? Where are they located?
These channels monitor the ducts for purged airborne radioactivity concentrations that could potentially result in an offsite dose exceeding limits.
The primary function of these monitors is to provide an ESF actuation on a high-high alarm initiating containment building purge supply and exhaust isolation. (CPIAS. This signal cross trips with CREFAS)
outside the containment building, between the power access purge exhaust and refueling purge exhaust ducts
In the SQ system, what is the automatic feature associated with Fuel Pool Area Monitor, RU-31?
Continuously monitors radiation levels on the fuel pool area of the fuel building.
The primary function of this monitor is to provide ESF actuation on high-high alarm isolating the normal fuel building ventilation and initiating the fuel building essential ventilation actuation signal (FBEVAS)
In the SQ system, what is the automatic feature associated with Condenser Vacuum Pump/Gland Seal Exhaust Monitor, RU-141?
Monitors for gaseous activity resulting from a primary to secondary leak.
RU-141 is a two channel (141A and 141B) beta scintillation detector.
Channel 141A measures the combined air removal and gland steam flow,
Channel 141B being mounted on the discharge piping of the air removal pumps only.
A high alarm on RU-141A will initiate the operation of the air removal system post filter system.
RU-141B provides alarm function only
In the SQ system, what is the automatic feature associated with Aux. Steam Condensate Receiver Tank Inlet Monitor, RU-7?
Auxiliary steam condensate returning from the boric acid concentrator, LRS evaporator and gas stripper is monitored before it leaves the receiver tank.
High activity alarm is indicative of radioactive leakage into one or more of the process components or improper operation.
Upon high-high alarm the RTI monitor automatically diverts the condensate to the liquid radwaste system
In the SQ system, what is the automatic feature associated with Waste Gas Decay Tank Monitor, RU-12?
to monitor the gross beta radioactivity level in the decay tank discharge header
A high activity alarm provides an indication of an abnormal operating condition, such as, an inadvertent discharge or incorrect valve lineup.
The monitor high-high activity alarm initiates isolation of the decay tank discharge header
How often are the non-tech spec SQ monitors calibrated? What about for the tech. spec ones?
At least every 18 months or following corrective maintenance
weekly, monthly, quarterly are required depending on the montior
What happens on a loss of the tech. spec related SQ monitors? Offsite Dose Calculation Manual related ones?
if a monitor becomes inoperable, action must be taken to fix the problem
compensatory actions must be taken, such as sampling
