radmonitors

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skrappie1
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110932
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radmonitors
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2015-12-14 11:55:12
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radmonitors advanced systems
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radmonitors
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  1. RIA-2323 and RIA-2324 main steam monitors
    • No auto actions
    • Indication of a primary to secondary leak
    • -enables you to figure out which S/G
  2. RIA-0915 CCW monitor
    • On a high alarm (7000 CPM) shifts the CCW surge tank vent valve CV-0915 from room to vent gas collection header
    • May see RGEM counts
  3. For a WGDT release, how is RIA-1113 setpoint calculated?
    • Determine background count rate after RE-1113 purge
    • Add background countrate to RIA-1113 release limit (provided by RETS supervisor on CH6.23-3 form)
    • Sum of 2 count rates is the high alarm setpoint for RIA-1113 during the waste gas release.
  4. Consequences of operating the radiation monitoring system with waste gas monitor RE-1113 improperly isolated?
    • Could isolate RV-1111, WGST overpressure protection, due to it discharging to the stack through RE-1113
    • When isolating RE-1113 you must open MV-WG118 before isolating RE-1113 by closing MV-WG117 or MV-WG119.
  5. Purpose of the process radiation monitoring system?
    Designed to ensure that radiation levels of process streams are indicated and alarmed so that action, either automatic or manual, can be taken to prevent radioactive releases from exceeding 10CFR20 limits.
  6. RIA-5211, turbine building sump discharge monitor
    • No auto actions
    • If contamination detected, sump pump discharge can be manually aligned to dirty radwaste system.
  7. What must be done if either safeguards rad monitors RIA-1810 or RIA-1811 are inoperable?
    • If either channel fails low or is otherwise inoperable
    • -close ventilation dampers immediately
    • Take action to repair affected channel
    • Dampers associated with that channel shall not be opened until the affected channel has been declared operable
  8. RIA-5712, fuel building addition vent monitor
    • Auto actions on high alarm
    • -trips aux building vent fan V-69
    • -standby V-70A/B may trip
    • -for fans that trip, the dampers close
  9. An out of range low condition on a typical digital ratemeter process monitor?
    Indicated by "0.00E0" and the "range" alarm LED illuminated
  10. RIA-0707 S/G blowdown monitor
    • P-707 (L-25A-6) takes suction from the B/D effluent and puts it through a HX through a rad detector and back to the B/D tank outlet piping.
    • Warning alarm at 2000 cpm
    • High alarm @ 6.804X103 cpm "process liquid monitoring hi rad"
    • Low flow alarm at 1.25 gpm amber light
    • High alarm and circuit failure close:
    • -CV-0704, B/D tank discharge to mixing basin
    • -CV-0739/0738 A/B S/G surface B/D
    • -CV-0771/0770 A/B S/G bottom B/D
  11. RIA-5711, radwaste addition vent monitor
    • High alarm, RIA-5711
    • -trips aux building ventilation fan V-67
    • -exhaust fan V-68A/B selected for standby may trip
    • -if fan suction pressure drops to 1.5" water vacuum, with supply fan off, the standby V-68A/B will start
    • -for fans that trip, dampers close
  12. RIA-0631 condenser off gas monitor
    • 1st indication of 1o to 2o leak
    • No auto actions
    • Setpoints set by RETS supervisor
    • Setpoints will be raised if 1o to 2o leak develops and stabilizes
  13. RIA-5710, penetration fan room monitor (CCW room) auto actions
    • Setpoint 4 mr/hr
    • Trips penetration room supply and exhaust fans V-78 and V-79 and closes dampers PO-8035 and PO-8036
  14. RIA-1809, radwaste area ventilation monitor
    • On high alarm, RIA-1809
    • -trips radwaste area supply fan V-10
    • -trips standby radwaste area exhaust fan V-14A/B
    • -after fan trips
    • -radwaste supply damper PO-1809 and standby fan exhaust damper (PO-1839 or PO-1840) close
    • -if exhaust flow drops to 25% nominal flow, the standby V-14A/B restarts and damper opens
    • Warning occurs at 0.7 times selected scale
    • High alarm occurs at 0.9 times selected scale
    • -if you change the scale, you change the setpoints
  15. What is required to release a WGDT with RIA-1113 inoperable?
    • At least 2 independent samples of the tank contents have been analyzed prior to the release
    • At least 2 independent verifications of the release rate calculations have been performed
    • At least 2 qualified AOs have independently verified that the WGST discharge lineup is correct
  16. RIA-1049, radwaste discharge monitor
    On a high alarm RIA-1049 closes CV-1049 (1 inch) and CV-1051 (3 inch), terminating any liquid radwaste release
  17. Out of range high condition on a typical digital ratemeter process monitor?
    Indicated by "EEEEE" and the "range" alarm LED illuminated
  18. RIA-1810 and RIA-1811 east and west engineered safeguards pump room vent monitors
    • On high alarm
    • -closes engineered safeguards room supply damper PO-1817 (1811) and exhast damper PO-1810(1812)
    • Supply to room from V-10
    • Exhaust from room supplied by V-14A/B
  19. What must be done if the fuel pool area rad monitor becomes inoperable?
    • Fuel moves in the SFP must be stopped until monitoring capability is restored-Immediately
    • Restore monitor or provide equivalent monitoring-within 72 hours
  20. RIA-2320, S/G B/D vent monitor
    • Only in service when a flash tank or B/D tank vent relief valve lifting
    • No auto actions
    • High alarm brings in "Gaseous waste monitoring Hi radiation"
    • -common alarm
    • Alarms at 6000 CPM
  21. Analog arm channel indications/controls
    • CS-check source 102 scale
    • Red button
    • -at/above alarm setpoint
    • -if pushed, shows the alarm setpoint
    • -typically set at 2-10X background
    • Green light
    • -resets the alarm
    • -indicates power available
    • -also channel output signal is on scale, at least 10-1 mr/hr
    • Yellow light disabled
    • -press button you get "Rad monitor system circuit failure"
    • -also get this on a loss of power
  22. RIA-1113, waste gas rad monitor
    On a high alarm, RIA-1113 closes waste gas discharge valves CV-1113 and CV-1123 terminating the waste gas release
  23. How would a radiation monitoring system high alarm impact the SFP cooling system?
    • Indicates low shielding
    • Potential fuel failure
    • Potential fuel handling accident
    • No impact on SFP cooling system
  24. RIA-0833, service water monitor
    • Alarm brings in common "process liquid monitoring high radiation alarm"
    • No auto actions
  25. RIA-1323, circ water discharge monitor
    • Backs up
    • -RIA-0707 S/G B/D monitor
    • -RIA-0833 SW monitor
    • -RIA-0915 CCW monitor
    • -RIA-1049 radwaste discharge monitor
    • No auto actions
  26. RIA-1817, containment building air monitor
    • No auto actions
    • Serves as one method of detecting a PCS leak
    • Manual purge can be done with the pushbutton
    • Low flow alarm at 1" water vacuum
    • -also lights amber light next to the handswitch
  27. Radwaste area high rad isolation reset pushbutton
    • Resets high rad lock-in relay provided the high rad has cleared.
    • Allows supply and exhaust fans to be restarted
    • Opens damper PO-1809, east and north corridor supply damper
    • Also resets and opens PO-1810,1811,1812,1817 on RIA-1810/1811 high rad (safeguards room HVAC)
  28. Containment gamma monitors
    • RIA in the control room
    • -2 scale meter
    • -8 position switch
    • -alarm, safe/reset, testlamps/pushbuttons
    • High alarm red button (400 R/hr)
    • -pressing this button causes high alarm setpoint to be shown
    • Yellow alert alarm (same operation as above) (40R/hr)
    • Safe/reset (green)
    • -resets the alarm, power is available, self check completed sat
    • -output signal on scale
    • Channel test (blue)
    • -lamp test if pushed
    • -ECS test
    • --initiates self test if in the test position
    • Performs a self test every 17.1 minutes
    • -lose monitoring for 6 seconds
  29. Which area radiation monitors provide an input to the PPC?
    • Spent fuel pool criticality monitors RIA-5709(N) and RIA-2313(S)
    • Main control room monitor RIA-2310
    • Refueling isolation monitors RIA-2316 and RIA-2317
    • Containment area monitors RIA-1805/6/7/8
    • Containment gamma monitors RIA-2321 and RIA-2322
  30. Containment rad monitors RIA-1805/6/7/8
    • Setpoint 10R/hr
    • 2/4 gives a containment isolation signal
    • 3 position switch
    • -check
    • --places the monitor in a tripped condition and does a self check
    • -operate
    • --places the monitor in service
    • -trip adjust
    • --causes channel output to go full scale high
    • Pushbutton lamps
    • -operate/green
    • -trip 1 (alert-yellow) 1R/hr
    • --pushbutton resets the alarm
    • -trip 2 (high-red) 10R/hr
    • --inputs to containment isolation logic
  31. RIA-2325, 2326, and 2327 radioactive gas effluents monitoring systems (RGEMS)
    • Monitors stack effluents
    • -backup to all effluent streams to the stack
    • On alert alarm from RIA-2326 (only), sample flow is routed through the sample bomb for 15 seconds. This is enough time to flush the existing air from the sample bomb and store a representative sample of stack effluent for retrieval and manual analysis
    • On a high alarm from RIA-2326 (only), the normal sample flow path is bypassed and sample flow is diverted to the accident filters and high-range noble gas monitor (RE-2327)

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