PRM

Question 1

What is the purpose of the PRocess Rad Monitor System?

Answer 1

TO provide continuous indication of rad levels or releases, and provide indication, alarms and trips/actions when needed

Question 2

What does the MSL PRM alarm?
Logic?
Required Action?
Power Supply?

Answer 2

Alarms: Indicate Gross fission product release
     Hi (1.5 x Normal)
     HI-Hi (3x Normal)
     Downscale
Logic:
     4 detectors in X-Area
     1 out of 2 twice
     Downscale alarm on loss of power
Action:
     Mech Vac Pp Trip
Power Supply:
     A&C - RPS Bus A
     B&D - ESS Bus

Question 3

Off Gas PRM
Alarms:
Logic:
Action:
Power Supply:

Answer 3

Alarms: Indicates release to environs
HI - per ODCM
HI-HI - per ODCM
Downscale
Logic:
1 upscale and 1 downscale OR 2 upscale
Downscale on loss of power - No action unless other is upscale
Action:
15 minute time delay:
Chimney Isol Valve closes (5406), Holdup Volume Drain closes, pressurized drain tank outless vlv closes, press. drain pump trips on lo vac
Power Supply:
A- RPS Bus A
B - RPS Bus B
15 min time delay powered by 24/48vdc

Question 4

RB Vent Rad Mon. OR Refuel Floor/FP Mon
Alarms:
Logic:
Action:
Power Supply:

Answer 4

Alarms: Indicates abnormal rad material in exhaust plenum
Hi 4mR/hr (RB Vent) OR 45mR/hr (Refuel/FP Mon)
Downscale
Logic:
4 channels - 2 in RB Vent ; 2 on Refuel Floor
Any single upscale;
2 downscale from same area (Vent or Refuel Floor)
LOSS OF POWER TO ANY DETECTOR INITIATES TRIP
Action:
RB Vent Dampers Trip
RB Vent Fans Trip on Damper Closer
Auto Start SBGT
u2&3 DW & Torus Purge Fans Trip
Power Supply:
A- RPS Bus A
B - RPS Bus B
SWAP OF RPS POWER SUPPLY MAY CAUSE TRIP

Question 5

IC Vent
Alarms:
Logic:
Action:
Power Supply:

Answer 5

Alarms: Identify Tube Leak
     Hi - 3-5mR/hr
     Downscale
Logic:
     2 detectors
     Downscale on loss of power
Action:
     ALARM ONLY
Power Supply:
     A - MCC 28-2
     B - MCC 29-3

Question 6

RBCCW PRM
Alarms:
Logic:
Action:
Power Supply:

Answer 6

Alarms:
     HI
     Downscale
Logic:
     1 Monitor in Hx Inlet
     Downscale on LOSS OF POWER
Action:
     Alarm Only
Power Supply:
     24/48 VDC Bus 2(3B)

Question 7

SW Rad Mon
Alarms:
Logic:
Action:
Power Supply:

Answer 7

Alarms:
    HI - On 901-2 and SWRM Skid
Logic:
    1 detector on 48" SW Discharge Header
    Downscale on LOSS OF POWER
Action:
    Alarm only
         Has purge mode to clear debris on low flow detector trip if low flow returns in 30 min or if blockage is not clear in 3.5 min
Power Supply:
    MCC 38-3 (via panel 2253-85

Question 8

Liquid RW Discharge Canal PRM
Alarms:
Logic:
Action:
Power Supply:

Answer 8

Alarms:  Samples effluent release line to discharge canal in RW buidling
    HI
Logic:
    1 detector near RW control Room
Action:
    grab sample on HI alarm
Power Supply:
    MCC 38-3 (via panel 2253-85)

Question 9

RBOC PRM
Alarms:
Logic:
Action:
Power Supply:

Answer 9

Alarms:
    HI - 40mR/hr
    Downscale
Logic:
    1 dector on OPERATORS CAB
Action:
    On hi signal - raising of main or aux hook will be inhibited - LOWERING IS STILL ALLOWED
         HI CAN BE BYPASSED in cab.  Downscale is NEVER bypassed
Power Supply:
    120 VAC Crane Instrument Power