SQ- Radiation Monitoring

Question 1

[SQ]
3 subsystems?
Where is the data sent to?

Answer 1

SRMS / PAMS / DRMS

Safety Related / Post-Accident / Digital Radiation

Display/ Controls: Main CR and RMS/Effluents Office

Data sent to ERFDADS

Question 2

[SQ]
PAMS purpose?

Answer 2

• Condenser effluent and Plant vent
• Post Accident & Long term monitoring of effluent gases and particulates.
• It informs operators of abnormal radiation in:

containment penetration areas,
main steam line area,
control room and other plant areas

(some are tech spec related)

Question 3

[SQ]
DRMS purpose?

Answer 3

BOP radiation monitoring system
-Info on process, effluent, and area radiation levels

Question 4

What types of monitors are used in each of the SQ subsystems?

Answer 4

Quality class QAG monitors

Question 5

[SQ]
What does SRMS provide? What types of monitors does it use?

Answer 5

ESF Actuation signals

technical specification monitoring and control functions

Contains only quality class Q radiation monitors

Question 6

[SQ]
Auto Features associated with RU-1?

Answer 6

CTMT Atmosphere Monitor

CIAS - CIVs auto shut to isolate the RU monitor from pressure and temperature transients following a LOCA.

Question 7

[SQ]
RU-29 and RU-30 Location?
Auto Features?

Answer 7

CR Vent Intake Monitor

• Track noble gas concentrations in the control room air intake.
• HI-Hi Alarm
• CREFAS - activating the CR essential filtration units.

Question 8

[SQ]
Auto Features RU-145?

Answer 8

PAMS low range monitor

Hi-Hi Alarm
- FEBEVAS (Isolates Normal FB Vent, Starts Essential Ventilation)
- Cross Trips CREFAS

Question 9

[SQ]
FB Ventilation Exhaust RU Monitor?
FB Actuation Signals?

Answer 9

• 145
• FEBEVAS & CREFAS

Question 10

[SQ]
RU-37 and RU-38 location?
Auto Features?

Answer 10

[CH] Power Access Purge Monitors
O/S CTMT
- between the power access purge exhaust and refueling purge exhaust ducts

-ESF actuation
high-high alarm CPIAS. This signal cross trips with CREFAS

Question 11

[SQ] RU-31?

Answer 11

FB Fuel Pool

Hi-Hi (Isolates FB Normal Ventilation, Starts FB Essential)

Question 12

[SQ] RU-141 Auto Features?

Answer 12

Gland Seal

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

Question 13

In the SQ system, what is the automatic feature associated with Aux. Steam Condensate Receiver Tank Inlet Monitor, RU-7?

Answer 13

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

Question 14

In the SQ system, what is the automatic feature associated with Waste Gas Decay Tank Monitor, RU-12?

Answer 14

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

Question 15

How often are the non-tech spec SQ monitors calibrated? What about for the tech. spec ones?

Answer 15

At least every 18 months or following corrective maintenance

weekly, monthly, quarterly are required depending on the montior

Question 16

What happens on a loss of the T/S related [SQ] monitors? Offsite Dose Calculation Manual related ones?

Answer 16

-T/S action must be taken to fix the problem

-compensatory actions must be taken, such as sampling