Radiation Monitoring System

Question 1

what are the three Rad monitoring subsystems?

Answer 1

SRMS Safety related mon sys
PAMS post accident mon sys
DCUs digital radiation display and control units

Question 2

What do SRMS do?

Answer 2

provides an actuation signal for the ESF isolation systems
tech spec related monitoring and control functions
only class Q radmonitors

Question 3

What does PAMS do?

Answer 3

long term post accident monitoring
monitors condenser effluent and plant vent
notifies operators of abnormal radiation in CTMT, MS, CR areas

Question 4

What does RU-1 actuate?

Answer 4

isolation valves at the penetration auto shutto isolate the monitor from pressure and temperature transients following a LOCA
Valves close on CIAS

Question 5

what do RU-29 and 30 monitor and actuate?

Answer 5

monitors noble gas concentrations in the CR air intake

hi-hi alarm activating the CR essential filtration units

Question 6

what do RU-37 and 38 monitor and actuate?

Answer 6

monitors the PAP ducts for radioactivity that could dose the public
inititates CTMT building purge supply and exhaust isolation, also CREFAS A & B

Question 7

what does RU-145 monitor and actuate?

Answer 7

low range monitoring of the fuel building ventilation
isolates the normal fuel building ventilation and initiates the essential vent system
HF A & B
HJ A & B

Question 8

what does RU-31 monitor and actuate?

Answer 8

monitors the fuel pool area
actuates on the hi hi alarm
isolates the FB vent and initiates a FBEVAS

Question 9

what does RU-141A&B monitor and actuate?

Answer 9

monitors gases from the vac pumps and GS condenser resulting from primary to secondary leak
initiates operation of the air removal system post filter system A.
B provides alarm function only

Question 10

what does RU-7 monitor and actuate?

Answer 10

• AS cond returning from the BAC, LRS evap and gas stripper is monitored before leaving the receiver tank.
• caused by radioactivity leak into a component or improper operation
• initiates an auto diversion of the condensate to the LRS system

Question 11

what does RU-12 monitor and actuate?

Answer 11

• monitors gross beta radioactivity in the decay tank discharge header
• high alarm initiates isolation of the decay tank discharge header

Question 12

how frequently are the radmonitors calibrated?

Answer 12

at least every 18 months

Question 13

where will a high alarm annunciate?

Answer 13

CR, RMS/effluent office, chemistry count room.