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EOP Core Concepts Flashcards

1
Q

What valve position and dp are utilized when feeding with a main feed pump per EOP-2?

A

10-15% open and 100-300 psid

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2
Q

What is and why do we limit the time the Boric Acid storage tanks are utilized as a charging source?

A

The time is limited to 30 to 45 minutes to preclude boron precipitation in the PCS.

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3
Q

What are the prioritized sources and pathways for boration?

A

Through charging pumps and line to PCS.

  • Pumped feed to CVCS from BA Tanks provided D-Bus energized.
  • Gravity feed to CVCS from BA Tanks provided C-Bus energized. Close Make-up stop, VCT and SIRWT outlets.
  • Charging pump suction aligned to SIRWT.

Through HPSI Train 2 if normal charging line not available.

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4
Q

What are the strategies for EOP-3, Station Blackout?

A
  1. Minimize PCS inventory losses
  2. Diagnosis of best option for restoring power
  • DG
  • Safeguards
  • Backfeed (Segreto #1 line best)
  1. Monitor station battery discharge current & strip loads as necessary
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5
Q

What are the strategies for EOP-6, ESDE?

A
  • Secure AFW to affected SG
  • Steam intact SG with witin 50 psid of faulted SG
  • Throttle SIAS
  • Stabilize PCS temp/press when faulted boils dry
  • Secure Containment Spray to preclude RAS
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6
Q

What aux feed pump flow control valves are available to throttle flow in the event of a loss of air?

A

P-8A & P-8B, CV-0727/CV-0749 are backed up by N2. CV-0736A/CV-0737A fail full open.

Use EOP Supplement 19 for local control of either trains valves if necessary.

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7
Q

What are the benefits of forced circulation?

A

Due to PTS concerns it is highly desirable to maintain forced circulation. Maintaining forced circulation minimizes the loop delta T, better equalizes loop temperatures, provides Rx head mixing, and provides better pressure control via main sprays.

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8
Q

How do we know conditions in containment are not conducive to H2 formation?

A

Containment Temp <125F

Containment Pressure < 4 psi

ensure that conditions conducive to hydrogen production are not present.

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9
Q

What is the PCS Tave value of the MSSV lift prevent temperature?

A

540F

Lift temperature for PCS is 551F.

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10
Q

How much water is used in filling and draining a SG with a tube rupture?

A

Fill from 30 to 85% uses 13,500 gallons.

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11
Q

When can you reduce containment spray and how do you do it?

A

If no RAS and Containment Pressure less than 33 psia,

Containment Air Coolers are in Accident Mode, AND

SIS actuated with adequate flow per EOP Supplement 4, THEN:

  • With three pumps operating, stop P-54B or P-54C.
  • With two pumps operating, close CV-3001 (preferred) by taking HS-3001C to bypass or close CV-3002 by taking HS-3002C to bypass.
  • Secure P-54B or P-54C.
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12
Q

What is the criteria for starting a primary coolant pump?

A

EOP-Supplement 3

  • Bus 1A or 1B energized.
  • Y01 energized. (Power to bearing temperature and other PCP status indicators.)
  • At least one Steam Generator is available for removing heat (feed flow and steam flow) from the PCS.
  • Single phase natural circulation has been established for the preceding 20 minutes in the loop selected for the first PCP restart.
  • Pressurizer level as corrected in EOP Supplements 9 and 10 is between:
    • 42% to 57% and controlled for the first PCP started
    • 42% to 85% and controlled for subsequent PCP starts
  • Saturation pressure using Pressurizer water phase temperature is greater than the Minimum Pressure for PCP Operation curve for the existing PCS temperature. REFER TO EOP Supplement 1, “Pressure Temperature Limit Curves.”
  • Average of Qualified CETs is at least 25F subcooled from EOP Supplement 1, “Pressure Temperature Limit Curves,” “Upper Portion” curve.
  • CCW to PCPs has NOT been interrupted longer than ten minutes AND CCW is supplying the selected PCP.
  • At least one of the following PCP Controlled Bleedoff paths is OPEN:
    • PCP Controlled Bleedoff Stop Valve, CV-2191
    • PCP Controlled Bleedoff Isolation Valves:
      • CV-2083
      • CV-2099
  • Technical Specifications LCO 3.4.6 and LCO 3.4.7 limits simultaneous operation of P-50A and P-50B when TC is less than 300F.
  • To ensure adequate NPSH for P-50D, the following is recommended:
  • P-50D not be the first pump starte and P-50C is operating prior to starting P-50D
  • Positive indication of PCP Controlled Bleedoff Flow is evident for the PCP to be started (Panel EC-11 recorders REC-C11-02 and REC-C11-03).
  • No more than one seal failed on the selected PCP.
  • At least one Oil Lift Pump for the selected PCP is available.
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13
Q

What are the mitigating strategies of EOP-9, Functional Recovery Procedure?

A
  1. Reactivity Control
  2. MVAE
  3. PCS Inventory Control
  4. PCS Pressure Control
  5. PCS/Core Heat Removal
  6. Containment Isolation
  7. Maintenance Vital Aux
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14
Q

How do you address containment sump strainer clogging?

A

If containment floor water level rising with sump level falling then:

IF 3 Containment Spray Pumps are operating, THEN STOP one Containment
Spray Pump (P-54B or P-54C preferred.)

THROTTLE HPSI flow to achieve 200 to 250 gpm flow to each
operating train by closing 2 loop isolation valves in each train and throttling the others.

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15
Q

When and how do you secure containment spray?

A
  • Containment Pressure < 3 psia
  • Not req’d for ambient cooling
  • Not requ’d for HPSI subcooling
  • Chemistry determines not needed for Iodine removal or ALL of the following:
    • Less than 1 hour since trip
    • Less than 1800R/hr on Cont HI Range Gamma
    • Cont isolated per Supplement 6

Then Stop spray pumps one at a time and monitor conditions.

If one pump operating, secure pump.

No pumps operating, close valves.

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16
Q

During a LOOP/Station Blackout, what could happen to the low pressure turbine?

A

No cooling water.

Blowouts could rupture by overpressurizing the condenser.

Close MSIVS, MISIV bypasses and blowdown valves.

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17
Q

What is covered in a GOP-8 Brief?

A

CRS Covers:

  • GOP-8 Precautions and Limitations
    • TAVE shall be maintained within 3F of TREF and greater than 525F
    • Pressurizer level shall be maintained within 3% of programmed level.
    • Pressurizer pressure shall be maintained within 2010 to 2100 psia band.
    • Steam Generator levels shall be maintained within 5% of normal level
  • Duty Plant Manager Book’s Reactivity Plan
  • 24% rate of power reduction
  • Group 4 Rods to 127 inches
  • Initial 60 gallon boration at 20 GPM. No flush. Additional will be in 20 gallon descrete borations.

NCOR Covers:

  • Covers approximate amount of boron and rods for a given power reduction based on contingency reactivity plan in Duty Plant Managers Book.
  • SOP-6 Precautions and Limitations (specifically for procedure use and rod deviation limitations)
    • Inserting regulating rods does not require procedure to be in hand or place kept
    • Rods will be aligned to with 2 inches of others in the group every 33 inches
    • VERIFY that 78.5 to 81.5 inches exist between rod groups which are
      being inserted simultaneously.

NCOT Covers:

  • Blow down flow rates per SOP-7
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18
Q

Within EOP-8, Station Blackout, how long do you have to verify Station Battery discharge rate is within the limits of EOP Supplement 7 or 8? What time frame bounds the load shed test to provide 8 hours of battery?

A

Within 30 minutes.

Load shedding is expected to occur within 1-2 hours. So 2 hours bounds it.

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19
Q

When is a control rod fully inserted?

A

EOP-1 Basis. Bottom rod indication is lit/in.

Any full length control rod that is above rod bottom indication should be considered not fully inserted.

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20
Q

How do you maximize upper head heat removal during natural circulation?

A

Maximizing the PCS cooldown rate and maintaining a high PCS pressure within the bounds of EOP Supplement 1 will maximize the reactor vessel upper head heat removal.

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21
Q

What are the strategies for EOP-5, SGTR?

A
  • Secure AFW to affected SG
  • Cooldown < 524F to isolate affected SG
  • Lower PCS Pressure <940 psi
  • Throttle SIAS
  • Commence a controlled cooldown
  • Monitor isolated SG Pressure
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22
Q

What is the criteria for Hot Leg Injection?

A

Hot Leg Injection Criteria

  1. Elapsed time from event initiation is greater than 5.5 hours & shutdown cooling will NOT be in service by 6.5 hours and ANY of the following:
  • Less than 25F subcooled or less than minimum subcooling curve for degraded containment.
  • PZR level 20%, 40% for degraded
  • RVLMS indicates less than 102 inches above fuel alignment plate.
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23
Q

How do you cool a steam generator with a tube rupture?

A
  1. Backflow to PCS then radwaste
  2. Drain via Blowdown to radwaste or condenser
  3. Steam to condenser
  4. Ambient Losses
  5. Steam to atmosphere via ADVs
24
Q

During EOP-9, what is minimum HPSI flow for two pumps operating? One pump?

A

2 pumps > 100 gpm total flow

1 pump > 50 gpm total flow

If not, then stop charging and utilizing EOP-Supplement 39, Alternate Methods of Reducing Pressurizer Pressure.

25
Q

When is the Hogger capable of self-sufficiant decay heat removal?

A

After two-hours of steam on code safeties in the event of ADV failure.

26
Q

What are the minimum containment spray with and without RAS?

A

Without RAS

  • 1 Pump - 1425 gpm
  • 2/3 pumps - 2850 gpm

With RAS

  • 1 pump - 925 gpm
  • 2/3 pumps - 2000 gpm
27
Q

When and how do you restore letdown?

A

If SI throttling criteria met and letdown is desired,

restore via EOP-Supplement 27.

28
Q

How do you verify natural circulation?

A
  • Core Delta-T less than 50F (Average of Qualified CETs minus TC)
  • Look at TMM for quick assessment
  • Loop THs and Loop TCs constant or lowering
  • Average of Qualified CETs at least 25F subcooled
  • Difference between Loop TH and Average of Qualified CETs is less than or equal to 15F
    • Indicates hot fluid flow from core to hot legs.
29
Q

At what temperature do we secure the first PCP? The second?

A

<450F – Secure 1st pump ( 3 allowed)

<300 – Secure 2nd pump (2 allowed)

30
Q

What are the EOP-7, Loss of All Feedwater Strategies?

A
  • Secure PCP and conserve SG Inventory
    • Determine best AFW option:
    • AFW from T-2
    • Main FW
    • Condensate Pump
    • Service Water/ Fire Water
  • Re-establish feedwater or once-through cooling
31
Q

What are the criteria for throtlling safety injection?

A
  • At least 25F subcooled or within minimum subcooling curve for degraded conditions on the EOP Supplement 1 Curves.
  • Pressurizer level greater than 20% (40% for degraded containment conditions)
  • At least one SG with level being maintained at 60-70% or being restored to 60-70%
  • Operable RVLMS is greater than 102 inches (4 green lights)
32
Q

When do you push the shunt trip push button? What do you do after it is done?

A

EOP-3, Station Black Out

IF voltage less than 105 v on D-30L/D-30 or faults on DC busses are not isolated, then push Shunt Trip go to EOP-9 and refer to AOP-41, Alternate Safe Shutdown Procedure.

33
Q

What are the criteria for terminating once-through cooling?

A
  • At least ONE S/G has level greater than or equal to -84% with feed and steam flow capability
  • The Average of Qualified CETs temperature is less than the saturation temperature for the LTOP setpoint AND NOT rising
  • Operable RVLMS channels indicate greater than 102 inches above the bottom of fuel alignment plate (621’ 8”).
  • PORVs are NOT in use for PCS Pressure Control success path PC-2
34
Q

What are the strategies for EOP-4, LOCA?

A
  • Lower pressure to lower leakage
  • Optimize SI and Throttle when criteria met
  • Establish SG Heat Removal for Subcooling and Coupling
  • Commence a rapid, controlled cooldown
  • Secure Containment Spray when criteria met
  • Prepare for and verify RAS
35
Q

How does a loss of Y-01 impact plant HVAC system?

A

If Y01 is not energized, then restoration of certain HVAC Systems will not be possible due to inoperable RIAs. SOP-24, “Ventilation and Air Conditioning System,” deals with the recovery of ventilation to spaces that have operating safety equipment. Permissive relays on several of these HVAC systems do not allow certain equipment to start unless the associated radiation monitoring instruments are in service and not alarming. In several cases, these radiation monitoring instruments are powered by the Y01 bus. Hence, complete HVAC systems operation cannot be restored until Y01 is re-energized.

36
Q

What are indications of voiding in the head?

A
  1. Charging and letdown flow don’t match with pressurizer level trend.
  2. Pressurizer level trend rising faster than anticipated.
  3. Core Delta-T or Loop Delta-T rising for unchanging steaming rate.
  4. Any indication less than 25F subcooled.
  5. RVLMS indicates voiding.
37
Q

During a station blackout, how often do you check PCS shutdown margin during the cooldown?

A

Every 50F

38
Q

What is the maximum water level in containment? What happens if it is exceeded?

A

596 feet 7.5 inches

Greater than that level and another source beyond SIRW is adding to the level.

39
Q

If boration via alternate charging with HPSI Train 2 is interupted, what do you do to restore.

A

Should choose a different Train 2 injection valve.

  • MO-3062
  • MO-3064
  • MO-3066
  • MO-3038
40
Q

What are degraded containment conditions?

A

Containment Temp >175F

Containment Pressure >3 psig

41
Q

What are strategies for EOP-8, LOOP/Force Circulation?

A
  • Ensure DGs load and sequence
  • Emergency Borate
  • Start Avail Air Compressors
  • Ensure MSIVs closed
  • Stabilize PCS Temp/Pressure
  • Verify Natural Circulation
42
Q

What is the normal process for throttling safety injection.

A

Secure one train’s HPSI pump first.

Then throttle the second trains loop isolation valves while balancing flow in each loop.

43
Q

What could challenge minimum charging flow of greater than 33 gpm?

A

Both charging valves (CV-2113/CV-2115) fail to open an CK-CVC2112 sticks.

44
Q

What bands are used when stabilizing the plant with natural circulation in progress?

A

Tave: 525F-540F target 532F

Pressurizer Pressure: 2050 - 2070 psi, target 2060

Pressurizer Level: 42-57%, in cascade

SG Level: 60-70% target 65%

SG Pressure: Commenserate with Conditions

Cooldown: 0

45
Q

What is the primary reason SG level drops post trip?

A

Recirculation flow into the downcomer region, where level is measured, is 4 parts from the dryers/seperators and one part from feed water.

On a trip, steam flow stops and recirculation flow stops. Result is a rapidly lowering level.

Additionaly, steam pressure rises, collapsing vapor bubbles.

46
Q

What are the methods of alternate charging to the PCS?

A

Charging via alternate pressurizer sprays

Charging via HPSI Train 2

47
Q

Per EOP-3, Station Blackout, upon power restoration and until BA Heat Tracing is functional, what should operator do with charging pumps aligned to BA tanks?

A

Run the pumps 2 minutes out of every 20 minutes to prevent BA buildup in the piping.

48
Q

What do you do if CET’s indicate greater than or equal to 900F?

A

Implement SAMG’s

49
Q

EOP-9, PCS Pressure Control PORVs: PC-2 lists what possible adverse consequences of using the PORVs for pressure reduction?

A

Quench Tank rupture disk will probably rupture, resulting in higher containment temperature, pressure, radiation levels and combustible gas concentration.

PORV opening results in rapid depressurization of the PCS that is hard to control and may result in a false high level in the Pressurizer or water flow out the PORVs.

PORVs may fail to reseat, resulting in a continuing LOCA.

It results in the inability to maintain a minium subcooled margin.

50
Q

When should the PORVs be closed during EOP-9 for PC-2, Pressure Control?

A

PC-2 using PORVs is used to maintian pressure within limits of EOP Supplement 1 and corrected pressurizer level less than 85%

PCS pressure drop with PORVs open will plateau at SG secondary side saturation temperature/pressure. Keeping the PORVs open when this plateau is reached just wastes PCS inventory.

51
Q

What is a Tave band of 525F to 540F based on?

A

Tave band of 525F to 540F is based on:

  1. Maintaining controller auto setpoints (532-540F)
  2. Preventing an unnecessary PCS cooldown/depressurization resulting in a Safety Injection Actuation Signal
  3. Maintaining Tave below the saturation temperature of steam at a pressure equal to the lowest setting of the S/G safety valves.
52
Q

What alarms/temperatures on ‘A’ Critical SW Header cooled components indicate proper cooling?

A

‘A’ Critical SW Header cooled components

  1. K-6B: EK-0557 clear
  2. VC-10: Unit operating OR tripped and with no trouble light lit
  3. VHX-27A: TI-0869 less than 87F with minimum 1 ESG cooler fan operating

OR

  1. V-27A AND/OR V-27B in AUTO and NOT operating
  2. E-54A/B: TIA-0914/TIA-0916 less than 90F if No RAS or less than 140F with RAS

IF specified condition NOT met OR is indeterminate, THEN local indication must be checked to determine if high temperature conditions exists.

53
Q

What alarms/temperatures on ‘B’ Critical Service Water Header served components indicate proper cooling?

A

‘B’ Critical SW Header cooled components

  1. K-6A: EK-0551 clear
  2. VC-11: Unit operating OR tripped and with no trouble light lit
  3. VHX-27B: TI-0870 less than 87F with minimum 1 ESG cooler fan operating

OR

  1. V-27C AND/OR V-27D in AUTO and NOT operating
  2. E-54A/B: TIA-0914/TIA-0916 less than 90F if No RAS or less than 140F with RAS

IF specified condition NOT met OR is indeterminate, THEN local indication must be checked to determine if high temperature conditions exists.

54
Q

How often do you check the status of S/G level and Auxfeedwater Flow in an EOP?

A

At least every 15 minutes.

55
Q

How often does the operator check PCS Temperature and Pressure when controller is in automatic?

A

Temperature

  • If greater than 50% signal - then continuously.
  • Otherwise at least once every minute.

Pressure

  • If not in Auto on PIC-0101 A/B and spray valves are full open, then monitor continuously until output signal is less than 90% - not full open.
  • If controlled via Auxiliary Spray Valve CV-2117 or cycling PZR heaters, then check once every minute.
56
Q

Why do we verify boration flow is at least 33 gpm?

A

Assuming a cooldown withing T.S. limits, greater than or equal to 33 gpm ensures boron added negative reactivity at a rate greater than cooldown added positive reactivity.

EOP (12 decks)

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