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LOIT 2020 SIM phase COPY > Loss of NonClass Inst power > Flashcards

Loss of NonClass Inst power Flashcards

1
Q

State the indications that would accompany the following failures and subsequent entry criteria for 40AO-9ZZ14 Loss of Non Class Instr or Control Power.

NKN-M45/M46

NKND41/D42/D43

NNN-D11/12/15/16

A

NKN-D45/46: Associated voltmeter and batt charger indicates 0 volts

NKN-D41/42/43: 125VDC Pnl D– TRBL and associated computer alarm point indicates deenergized.

NNN-D11/D12/D15/D16: 120VAC PNL D– TRBL and associated computer point indicates deenergized.

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2
Q

State what would happen to SBCS if the following loses power:

NKN-D42

NNN-D11

NNN-D12

A

NKN-D42: SBCS valves lose power to perm and QO. Valves fail closed.

NNN-D11: SBCS logic loses power and no manual or auto operation is available. Valves fail closed.

NNN-D12: SBCS loses logic power and no manual or auto operation is available. Valves fail closed.

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3
Q

State which Unit’s NNN panels are DE-ENERGIZED after a SIAS load shed.

A

UNIT 1/2 D15 and D16, and U3 NNN-D15 are deenergized following a SIAS load shed.

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4
Q

How is RPCS affeced by a loss of NNN-D11 and NNN-D12?

A

NNN-D11: RPCS will not function to drop CEAs or runback/setback the MT.

NNN-D12: CEAs will still drop however, the MT runback is disabled. MT setback will still occur to 60% CV position.

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5
Q

How is RRS affected by a loss of nonclass power?

A

A loss of NNN-D12 will result in RRS failure causing:

No input to CEDMCS in AS.

No input to PLCS.

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6
Q

Describe how DFWCS is affected by a loss of instrument power.

A

NNN-D11: CDP B miniflow fails open causing drop in MFP suction pressure.

DFWCS will use canned NI value due to failed NI ch low.

NNN-D12: CDP A and C miniflow fails open causing drop in MFP suction pressure.

DFWCS will use canned NI value due to failed NI ch low. If in 1E: 5% canned value; If in 3E: 60% canned value.

NNN-D15: MFP A steam supply control valves fail closed; MFP coasts down but RPCB does not sense a MFP trip.

NNN-D16: MFP B steam supply control valves fail closed; MFP coasts down but RPCB does not sense a MFP trip.

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7
Q

How does a loss of NNN-D11 instr power affect the PLCS/PPCS system?

A

NNN-D11

  • PZR Level Master Controller fails to zero output
  • Normally running and standby Charging Pumps will stop.
  • PT-100Y fails low (low pressure signal to PPCS if selected)
  • LT-110Y fails low
  • PZR heaters trip if selected to “Y”
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8
Q

How does a loss of NNN-D12 affect the PLCS/PPCS system?

A

NNN-D12

  • PZR Pressure Master Controller fails to zero output
  • PZR Spray Valve Controller fails
  • PZR Spray Valves fail closed
  • LT-110X fails low
  • PZR heaters trip if selected to “X”
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9
Q

How does a loss of NKN-D42 affect the PLCS/PPCS system?

A

NKN-D42

  • PLCS/PPCS circuits lose power
  • Generates low level PZR heater cutoff signal
    • LCO 3.0.3 entry is required for the class back-up heaters (unable to energize)
    • LCO 3.0.3 can be exited once local control established (RSP)
  • Half the non-class PZR heaters lose control power
  • PZR Main Spray Valves position indication is lost
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10
Q

How does a loss of NNN-D11 affect the CVCS system?

A

NNN-D11

  • Letdown Control Valves (110P/Q) fail closed (loss of letdown)
  • Normally running and standby Charging Pumps will stop (PZR LIC zero output)
  • VCT Make-Up Flow Controllers fail (210X/Y)
  • RCP 1A/1B Seal Injection FICs fail (FCVs fail open)
  • RDT Vent Valve fails closed
  • RDT/HUT pumps trip and cannot be started
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11
Q

How does a loss of NNN-D12 affect the CVCS system?

A

NNN-D12

  • VCT LT-227 fails low. Charging pump suction swaps.
  • Only way to stop borating is to stop charging pumps
  • MCR VCT level indication is lost.
  • CHN-TIC-223 fails to zero output closing NCN-TV-223.
  • CHB-523 closes (Loss of power to TS-224-2)
  • Letdown Backpressure Control Valves fail closed
  • Charging Line Backpressure valve fails closed
  • RCP 2A/2B Seal Injection FICs fail (FCVs fail open)
  • BAMPs/RMW pumps trip and cannot be started
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12
Q

How does a loss of NKN-D42 affect the CVCS system?

A

NKN-D42

  • CHN-LC-227, VCT level controller auxiliary circuit lost causing charging pump suction to swap to CHN-UV-514.
  • CHB-UV-523 fails closed (loss of power to 63X relay)
  • VCT make-up is not available. (DC Control Power lost to VCT make-up control, 210X/Y fail closed)
  • Charging Pump automatic control circuit deenergizes
    • All Charging Pumps stop
    • Manual control is available
  • RCP Seal Injection FCVs fail open.
  • Loss of position indication for Letdown Control and Backpressure Control Valves.
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13
Q

How is the CD and FW system affected by a loss of NNN-D11/D12/D15/D16 and NKN-D41?

A

NNN-D11:

  • Condensate Pump B Mini-flow Valve fails open (MFP suction pressure ↓)

NNN-D12:

  • Condensate Pump A and C Mini-flow Valves fail open (MFP suction pressure ↓, could cause B MFP to trip in 10 sec)
  • Requires down power to maintain MFP suction, if plant transient occurs, trip the reactor. (no RRS/SBCS)
  • Hotwell level control valves fail closed (loss of power to LICs)
  • Condenser Polishing Demin. ΔP Control Valve (CDN-PDV-195) fails open

NNN-D15:

  • MFP A Control Valves fail close. RPCB does not auto actuate.
  • Manually trip the A MFP to actuate the RPCB

NNN-D16:

  • MFP B Control Valves fail close. RPCB does not auto actuate.
  • Manually trip the B MFP to actuate the RPCB

NKN-D41 (M45):

  • Hotwell level control valves fail closed
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14
Q

How is the ED system affected by a loss of NKN-D41/D42/D43?

A

NKN-D41:

  • B Heater Drain Pump loses control power
  • Both pump’s recirc valves fail open due to loss of power(powered from NKN-D41)
  • Pump A discharge valve fails closed on loss of power to valve.
  • MSR and 1st and 2nd stage drain tanks fail dumped to Cond.
  • HP htr 6 lvl controlled on Hi lvl dumps to Cond.

NKN-D43:

  • B Heater Drain Pump discharge valve fails closed on loss of power to valve.

NKN-D42:

  • A Heater Drain Pump loses control power
  • A Heater Drain Pump discharge and recirc valve will close due to loss of control power to the pump. This is not due to the valves failing on a loss of power.
  • Open pump breaker locally to protect the pump
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15
Q

How does the plant respond to a loss of NKN-M45?

A
  • Reactor trip is required
    • Reactor Tripped Relay (UVRX) loses 125Vdc power causing a Turbine Trip.
    • SBCS is not available
  • AOP actions need to continue during SPTAs and Reactor Trip EOP.
  • Open Main Generator Output breakers (directed during SPTAs)
    • Protective relaying is lost. Generator will not trip.
  • Loss of NAN-S01/S02 occurs (Control power is lost, FBT fails)
  • Close the MSIVs (loss of non-class power)
  • Use AFW and ADVs (MFPs and SBCS not available)
  • Locally operate class PZR heaters from RSP (no control power to non-class heaters)
  • Align charging through CHE-HV-536
  • Restore letdown
  • Perform 40AO-9ZZ20 Loss of HVAC
  • Align NAN-S05 control power to NKN-M46
  • NKN-D42/D43/D44 are also lost
  • Annunciators:
    • U1/U2: Lose all annunciator if SIAS actuates
    • U3: Lose half the annunciator if SIAS actuates
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16
Q

How does the plant respond to a loss of NKN-D46?

A

Loss of NKN-M46

  • Loss of RCP control power
  • Loss of power to emergency DC oil pumps (Turbine, MFPs, Seal Oil)
  • Loss of control power results in a loss of protective relaying to S/U XFMRs. (Off-site power operability is maintained)
  • Loss of normal control power to NAN-S06 (requires transfer to NKN-M45) and backup control power to NAN-S05.

LOIT 2020 SIM phase COPY (25 decks)

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