Safetyinjection/CHP/CHR

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skrappie1
ID:
114478
Filename:
Safetyinjection/CHP/CHR
Updated:
2015-11-17 12:58:02
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safety injection CHP CHR advanced systems
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safetyinjection/chp/chr/sirwt
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  1. What are the LPSI pump auto starts/trips?
    • Auto start on SIS
    • Auto start on DBA sequencer
    • Auto trip on SIRWT low level (RAS)
  2. LCO 3.5.3 ECCS - Shutdown
    • LCO 3.5.3 One Low Pressure Safety Injection (LPSI) train shall be OPERABLE.
    • --------------------NOTE--------------------
    • A LPSI train may be considered OPERABLE during alignment and operation for shutdown cooling if capable of being manually realigned to the ECCS mode of operation.
    • APPLICABILITY: MODE 3 with Primary Coolant System (PCS) temperature < 325°F,
    • MODE 4.
    • ACTIONS:
    • A. Required LPSI train inoperable.
    • -A.1 Initiate action to restore one LPSI train to OPERABLE status. IMMEDIATELY
  3. LCO 3.3.3 Engineered Safety Features (ESF) Instrumentation
    LCO 3.3.3 Four ESF bistables and associated instrument channels for each Function in Table 3.3.3-1 shall be OPERABLE.

    APPLICABILITY: As specified in Table 3.3.3-1.

    • ACTIONS
    • -------------NOTE---------------------------
    • Separate Condition entry is allowed for each Function.

    NO </= 1 HOUR ACTIONS
  4. What are the power supplies for the SIT outlet valves (MO-3041/3045/3049/3052)?
    • MO-3041
    • -MCC-21
    • MO-3045
    • -MCC-23
    • MO-3049
    • -MCC-22
    • MO-3052
    • -MCC-24
  5. What causes a SIS?
    • PZR pressure LO-LO 1605 psia 2/4 logic with no block
    • CHP 3.7-4.3 psig
    • Safety injection initiate pushbutton
  6. What happens when CHP is reset?
    • All valves stay in the CHP position due to seal in except
    • -CCW supply and return containment isolation valves (CV-0910,0911,0940)
    • -FW isolation valves (CV-0701,0703,0734,0735)
    • -CV-3001/3002 containment spray valves go to whatever position their switch is in (normally closed)
    • If CHP is reset, but not SIAS the spray pumps will not auto start on another CHP
  7. What are the LPSI pump minimum and design flows?
    • Minimum flow
    • -170 gpm
    • Design flow
    • -3000 gpm at 350ft head (152 psia)
  8. LCO 3.3.4 Engineered Safety Features (ESF) Logic and Manual Initiation
    LCO 3.3.4 Two ESF Manual Initiation and two ESF Actuation Logic channels and associated bypass removal channels shall be OPERABLE for each ESF Function specified in Table 3.3.4-1.

    APPLICABILITY: According to Table 3.3.4-1.

    • ------------NOTE----------------------------
    • Separate Condition entry is allowed for each Function.

    NO </= 1 HOUR ACTIONS
  9. What equipment actuates on a CHR?
    • All automatic isolation valves close except:
    • -CCW containment supply and returns (CV-0910/0911/0940)
    • -MSIVs (CV-0501/0510)
    • -main feed isolations and bypasses (CV-0701/0703/0734/0735)
    • Disables the auto start feature of the safeguards sump pumps
  10. What is the reason for the minimum volume in the SIRWT?
    • Sufficient volume to provide at least 20 minutes of full flow from 1 train of ESF pumps prior to reaching a low level switch over to RAS
    • Sufficient to support continued ESF pump operation after the switch to RAS
  11. What are the power supplies for the HPSI pumps?
    • P-66A
    • -D BUS
    • P-66B
    • -C BUS
  12. What are the LPSI pump power supplies?
    • P-67A
    • -D BUS
    • P-67B
    • -C BUS
  13. What are the minimum/maximum boron concentration limits for the SITs (T-82A/B/C/D)?
    • Max
    • -</= 2500 ppm
    • Min
    • ->/= 1720 ppm
  14. What is the interlock between the hot leg and cold leg injection valves (MO-3081/3083/3080/3082)?
    The hot leg injection valve (MO-3083/3082) cannot be opened unless the cold leg injection valve (MO-3081/3080) is closed.
  15. Why is pressure required to be >1600 psia in relation to safety injection system?
    You need the high D/P to seat the check valves.
  16. What causes pressure to rise between check valves in the SIS?
    Heat transfer across the PCS check valves
  17. What are the temperature limits on the SIRWT?
    • Min
    • -40oF
    • Max
    • -100oF
    • 85-95oF preferred
  18. What is the minimum/maximum boron concentration limits on the SIRWT?
    • Maximum
    • -2500 ppm
    • Minimum
    • -1720 ppm (T.S.)
  19. Where do the SITs vent to?
    The SITs vent to the vent gas collection header
  20. What are the normal and minimum SIT (T-82A/B/C/D) pressures?
    • Design
    • -250 psig
    • Normal
    • -210-215 psig
    • Mimumum
    • ->/= 200 psig
    • -ensures the gas volume will generate discharge flow rates during injection that are consistent with assumed safaty analyses.
  21. Where do the SITs drain to?
    PSDT
  22. What automatically closes the SIT pressure control valves (CV-3042/3046/3047/3038)?
    They close on SIS
  23. What happens when the PCS pressure rises above 1690 psia if SIAS was properly blocked?
    • The block is removed
    • -you now could get a SIAS on PZR pressure of 1605 psia
  24. What are the power supplies for the HPSI loop injection valves?
    • LOOP 1 MO-3007/3009/3011/3013
    • -MCC-1
    • LOOP 2 MO-3062/3064/3066/3068
    • -MCC-2
  25. What are the power supplies for the LPSI loop injection valves?
    • Loop 1 MO-3008/3010
    • -MCC-1
    • Loop 2 MO-3012/3014
    • -MCC-2
  26. What are the SIT high/low level alarm setpoints?
    • High
    • -48% (NR)
    • Low
    • -32% (NR)
  27. What are the HPSI pumps minimum and design flows?
    • Minumum flow of 25 gpm
    • Design flow of 300 gpm at 2500ft of head (approx 1084 psia)
    • One pump is sufficient for makeup due to boil off by decay heat
  28. What are the power supplies for hot and cold leg injection valves?
    • MO-3080
    • -MCC-24
    • MO-3081
    • -MCC-21
    • MO-3082
    • -MCC-22
    • MO-3083
    • -MCC-23
  29. What are the volume limits of the SIRWT?
    • Minimum T.S. Modes 1-3
    • -250,000 gallons (85%)
    • Administrative limit
    • -275,970 gallons
    • Minimum T.S. Mode 4
    • -200,000 gallons (67%)
  30. LCO 3.5.2 ECCS - Operating
    LCO 3.5.2 Two ECCS trains shall be OPERABLE.

    • APPLICABILITY: MODES 1 and 2,
    • MODE 3 with Primary Coolant System (PCS) temperature ≥ 325°F.

    • ACTIONS:
    • D. Less than 100% of the
    • required ECCS flow
    • available.
    • -D.1 Enter LCO 3.0.3. IMMEDIATELY
  31. What must be done prior to resetting CHP and why?
    • If a spray pump is running, you must open one of the control valves to prevent spray pumps from having no flow
    • CCW containment supply and return CVs must be placed in closed unless they are already opened by the in use EOP
    • -this prevents shock to PCP seals if CCW was isolated >10 minutes.
  32. What are the power supplies for the CHP relays?
    • Right channel
    • -Y-40
    • Left channel
    • -Y-10
  33. LCO: 3.5.4 Safety Injection Refueling Water Tank (SIRWT)
    LCO 3.5.4 The SIRWT shall be OPERABLE.

    APPLICABILITY: MODES 1, 2, 3, and 4.

    • Actions:
    • B. SIRWT inoperable for reasons other than Condition A. (Boron or Temperature)
    • -
    • B.1 Restore SIRWT to OPERABLE status. 1 hour
  34. What are the SIT high/low level switches set at?
    • Low
    • -18% (NR)
    • High
    • -62% (NR)
    • Brings in the alarm to tell you that you are about to exceed your tech spec limits
  35. What are the 3 positions for the CHP bypass switches?
    • Test
    • -containment spray valve will not open if >50 psig header pressure is sensed
    • Normal
    • Bypass
    • -allows closure of the containment spray valves even with an active CHP
  36. What is needed to meet the design basis of the Safety Injection System?
    • 3 of 4 SITs
    • 1 HPSI pump
    • 1 LPSI pump
    • -with assumed 25% spillage of SI flow out of the PCS break
    • 1 Diesel Generator
  37. LCO: 3.3.8 Alternate Shutdown System
    LCO 3.3.8 The Alternate Shutdown System Functions in Table 3.3.8-1 shall be OPERABLE.

    APPLICABILITY: MODES 1, 2, and 3.

    ----------------NOTE------------------------

    Separate Condition entry is allowed for each Function.

    NO </= 1 HOUR ACTIONS
  38. LCO: 3.3.7 Post Accident Monitoring (PAM) Instrumentation
    LCO 3.3.7 The PAM instrumentation for each Function in Table 3.3.7-1 shall be OPERABLE.

    APPLICABILITY: MODES 1, 2, and 3.

    • -------------NOTE---------------------------
    • Separate Condition entry is allowed for each Function.

    • ACTIONS:
    • B. Required Action and associated Completion Time of Condition A not
    • met.
    • -B.1 Initiate action in accordance with Specification 5.6.6. IMMEDIATELY
    • E. Required Action and associated Completion Time of Condition C not
    • met.
    • -E.1 Enter the Condition referenced in Table 3.3.7-1 for the channel. IMMEDIATELY
    • G. As required by Required Action E.1 and referenced in Table 3.3.7-1.
    • -G.1 Initiate action in accordance with Specification 5.6.6. IMMEDIATELY
  39. CHR
    • 2/4 RIA-1805/6/7/8
    • -10R/hr
    • 1/2 containment refueling monitors RIA-2316/2317
    • -80 mr >BKGD
    • Activates CIS
    • -does not close CCW supply to containment (closed on CHP)
    • Trips air room purge fan V-46
    • Actuates CRHVAC emergency system (Trains A and B)
    • Disables auto operation of the safeguards sump pumps
  40. What are the power supplies for the containment high radiation (CHR) relays?
    • Right channel
    • -Y-40
    • Left channel
    • -Y-10
  41. What is the setpoint and the logic necessary to block SIAS?
    • 3/4 PZR pressure <1690 psia
    • Block switch turned to block and released
    • -only blocks SIAS on PZR pressure LO-LO
  42. SIT (T-82A/B/C/D) volume
    • Max
    • </= 1176 ft3 (66% narrow range)
    • Normal
    • 40-45%
    • Min
    • >/= 1040 ft3 (14% narrow range)
    • -sized such that 3 of the 4 tanks contain enough water to flood the core and downcomer following a LOCA
  43. LCO: 3.5.1 Safety Injection Tanks (SITs)
    LCO 3.5.1 Four SITs shall be OPERABLE.

    APPLICABILITY: MODES 1 and 2.

    • ACTIONS:
    • D. Two or more SITs inoperable.
    • -D.1 Enter LCO 3.0.3. IMMEDIATELY
  44. What are the reasons for the minimum/maximum ppm boron concentrations in the SIRWT?
    • Maximum
    • -prevents boron precipitation
    • Minimum
    • -ensures that following a LOCA with a minimum level in the SIRWT, the reactor will remain subcritical in the cold condition following mixing of the SIRWT, SITs and the PCS volumes
  45. What is the containment high rad alarm logic?
    1 out of 4 logic

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