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Flashcards in Systems Test 2 Deck (61):
1

LOT 201.06 CVCS


What will generate a letdown valves sequence incorrect alarm?

Shutting MOV-465 OR MOV-468 prior to FV-011


Switches located on CP004.


Note:
FV-011 shuts first to prevent water hammer in the regenerative HX.

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2

LOT 201.06 CVCS


At what pressure will the VCT relief valve (CV-3101) lift?

75 psig


Relieves to the RHT.

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3

LOT 201.02 RCS


What is Keff, RTP, and Tavg when the plant is in MODE 1?

Power Operation:

Keff:
≥ 0.99

RTP:
> 5%

Tavg:
≥ 350 ˚F

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4

LOT 202.32 RCB Chilled Water


With regards to the RCB Chilled Water system, what happens during a SI or a LOOP?

RCFC Chilled Water OCIVs:
Close on SI OR LOOP

RCFC CCW OCIVs:
Open on SI
Remain Closed on LOOP
Operators must open them (30 min req. [EOPs])


RCFC CCW OCIVs will NOT open unless Chilled Water OCIVs shut.


Note:
If SI and LOOP happen concurrently, SI wins and CCW OCIVs open.

5

LOT 201.04 PZR, PRT, & RCDT


Where does the RCDT relief valve relieve to?

Containment Normal Sump

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6

LOT 201.41 ESF Load Sequencer


Plant Conditions:

  • ESF DG in parallel with offsite
  • SI occurs

What does the ESF DG load sequencer do?

Output bkr will open and then MODE I will occur


If output bkr does not trip within 1 sec, incoming breaker will trip, sequencer will strip bus w/ exception of LC breakers and MODE III sequence will run.

7

LOT 201.05 RCPs


What is the pressure, flowrate, and flowpath of the #1 Seal?

Pressure:
2250 psig → 30 psig
Min D/P: 220 psid

Flowrate:
8 gpm → 3 gpm

Suction:
CVCS

Discharge:
VCT **
CCP Suction
Seal #2


Inlet temperature ≈ 110 ˚F (Do not exceed 230 ˚F)

≈ 5 gpm goes to pump radial bearing and thermal barrier HX


Note:
On ΦA CI, Seal return to VCT isolates and relief will lift (150 psig) to send water to PRT.

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8

LOT 201.02 RCS


What are the piping penetrations off the hot legs?

Loop 1:
RHR "A" Suction
SI "A" Recirc
Sampling

Loop 2:
RHR "B" Suction
SI "B" Recirc

Loop 3:
RHR "C" Suction
SI "C" Recirc
Sampling

Loop 4:
PZR Surge Line

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9

LOT 201.06 CVCS


With regards to LT-112 and LT-113, how is level controlled in the VCT?

95%
112A Full Divert
LT-112 AND LT-113
Alarm
LT-113

68% - 95%
112A modulates diverting to RHT
LT-112

48%
Stops Auto M/U
LT-112

28%
Starts Auto M/U
LT-112

15%
Alarm
LT-112 AND LT-113

3%
Shifts CCP suction from VCT to RWST (112C / 113B)
Isolates VCT outlet (112B / 113A)
LT-112 AND LT-113

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10

LOT 201.20 SSPS


Which actuation train's urgent alarm will result in a logic train's urgent alarm?

Actuation Train "A" → Logic Train "R"

Actuation Train "B" → Logic Train "S"


Actuation Train "C" does NOT result in a logic train's urgent alarm.

Actuation Train "C" trouble alarm does result in a Logic Train "R" AND Logic Train "S" trouble alarm.


Note:
Urgent alarms on CP026.

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11

LOT 201.06 CVCS


What will close the letdown CIVs (CV-023 / CV-024)?

CI ΦA
High Energy Line Break
112.7 ˚F [1/8] in MAB room shuts associated valve

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12

LOT 201.06 CVCS


What will automatically close the VCT outlet isolation valves (MOV-112B/MOV-113A)?

MOV-112B AND MOV-113A
SI
Opens MOV-112C AND MOV-113B

MOV-112B
VCT Level - Low 2 (3%) [LT-112]
Opens MOV-112C

MOV-113A
VCT Level - Low 2 (3%) [LT-113]
Opens MOV-113B


To ensure CCPs have suction water at all times, RWST supply valves (MOV-112C/MOV-113B) must be full open to close respective VCT Outlet valve (MOV-112B/MOV-113A).


Note:

  • Holding the manual switches for the valves (112B/C and 113A/B) will override any auto functions and the valves will position as selected.
  • Located on CP004.

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13

LOT 201.02 RCS


What is Keff, RTP, and Tavg when the plant is in MODE 4?

Hot Shutdown:

Keff:
< 0.99

RTP:
0%

Tavg:
 350 ˚F > Tavg > 200 ˚F

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14

LOT 201.06 CVCS


When will the letdown temperature divert valve (TCV-143) automatically bypass the demins?

Letdown HX Discharge Temp - High (137 ˚F)
OR
BTRS Demin Inlet Temp - High (157 ˚F)


Located on CP004


Note:
Loss of Air/voltage fails to divert.

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15

LOT 201.05 RCPs


What must pressure in the bearing oil lift system be in order to start a RCP?

600 psig


  • Blue permissive light on CP005
  • Bearing Oil pump must be running to start pump. (Not required for light however)
  • Must be operated for ≥ 2 mins by procedure prior to starting RCP.

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16

LOT 201.41 ESF Load Sequencer


What is the MODE III sequence of starting loads?

1 Sec:
480 V Buses

6 Sec / 10 Sec:
HHSI / LHSI

15 Sec:
Containment Spray (1st Try)
RCFC (11/12)

20 Sec / 25 Sec:
CCW / ECW

30 Sec:
AFW

35 Sec:
CR / EAB HVAC (Emergency MODE)
Essential Chilled Water Pump
Standby Essential Chiller

40 Sec:
Containment Spray (2nd Try / Locks in)

240 Sec:
Running Essential Chiller(s)

280 Sec:
Sequence Complete

17

LOT 201.41 ESF Load Sequencer


What is the MODE I sequence of starting loads?

6 Sec / 10 Sec:
HHSI / LHSI

15 Sec:
Containment Spray (1st Try)
RCFC (11/12)

20 Sec / 25 Sec:
CCW / ECW

30 Sec:
AFW

35 Sec:
CR / EAB HVAC (Emergency MODE)
Essential Chilled Water Pump
Standby Essential Chiller

40 Sec:
Containment Spray (2nd Try / Locks in)

240 Sec:
Running Essential Chiller(s)

280 Sec:
Sequence Complete

18

LOT 201.15 RCS Temperature Monitoring


What are the RCS NR temperature instruments used for?

Tavg:
OT∆T
OP∆T
FW Isolation
P-4 w/ Tavg - Low (574 ˚F)
P-12
< 563 ˚F [2/4] Blocks steam dumps

Auctioneered High Tavg:
Rod Control
Indication on CP005 is Auctioneered Low Tavg
Steam Dumps
PZR Level Control

Auctioneered Low Tavg:
C-17

Auctioneered High ∆T:
Rod Insertion Limit


3 in HL (120˚ apart for laminar flow concerns) and 1 in CL per loop.

Also has 3 fast response RTDs in CL per loop.


Note:
3 HL RTDs are averaged together to give signal. If 1 fails the system will automatically kick it out.

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19

LOT 201.02 RCS


What size are the pipes in the RCS?

Cold Leg:
27.5"

Hot Leg:
29"
Bigger than cold leg to accommodate expansion of coolant.

Intermediate Leg:
31"


Inside Diameter of pipes.

20

LOT 201.15 RCS Temperature Monitoring


What are the RCS WR temperature instruments used for?

PAMS

COMS
Auctioneered Low Tc (PCV-656A) and TH (PCV-655A)

H/U and C/D

Aux S/D Panel


1 in HL and 1 in CL per loop.


Note:

  • Located on CP018 and ICS
  • ASP for TC only.

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21

LOT 201.02 RCS


What is Keff, RTP, and Tavg when the plant is in MODE 2?

Startup:

Keff:
≥ 0.99

RTP:
≤ 5%

Tavg:
≥ 350 ˚F

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22

LOT 201.02 RCS


What are the piping penetrations off the cold legs?

Loop 1:
PZR Spray
SI Train "A" Injection / RHR "A" Return
Same Penetration
Normal Charging

Loop 2:
SI Train "B" Injection / RHR "B" Return
Same Penetration

Loop 3:
SI Train "C" Injection / RHR "C" Return
Same Penetration
CVCS Alternate Charging

Loop 4:
PZR Spray

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23

LOT 201.02 RCS


What would Loop 1 RCS flow indicate if the high pressure tap on loop 1 ruptures?

All loop flows in that loop fail to zero


Loop flow consists of 1 High Pressure (Outside of elbow) and 3 Low Pressure (Inside of elbow).

↓∆P = ↓HP - LP → Flow ↓


Note:
Rupture of a Low pressure tap would result in Flow failing high on 1 of 3 flow instruments.

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24

LOT 201.02 RCS


What is Keff, RTP, and Tavg when the plant is in MODE 6?

Refueling:

Keff:
≤ 0.95

RTP:
0%

Tavg:
≤ 140 ˚F


Fuel in the Rx vessel w/ vessel closure bolts less than fully tensioned or head removed.

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25

LOT 201.22 ESF


What systems make up the ESF system?

RCS M/U:
ECCS
HHSI, LHSI, SI, Accumulators

S/G M/U:
Aux FW

Containment:
Containment Isolation
Containment Heat Removal
Containment Combustible Gas Control

HVAC:
EAB / CRE HVAC
FHB HVAC

26

LOT 201.06 CVCS


What will automatically close MOV-033A/B/C/D and, by doing so, isolate RCP seal injection?

CI ΦA
WITH
Charging Header Pressure - Low (≤ 560 psig)
Indicated on CP004 (PT-204)


Note:
Holding switch on CP004 in "OPEN" position will override auto closure signal and allow valve to stay open.

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27

LOT 201.02 RCS


How many NR hot leg and NR cold leg temperature instruments are there in each loop of the RCS?

3 Hot Legs
Located 120˚ apart for stratification purposes

1 Cold Leg
Located downstream of RCPs (Stratification not a concern)


Feed into Tavg and ∆T.

28

LOT 201.06 CVCS


At what pressure will the letdown relief valve (CV-3100) lift?

600 psig


Relieves to PRT.

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29

LOT 201.22 ESF


What are the ESF support systems?

ECW cooling pond

ECW

CCW

ESF DG's

30

LOT 201.05 RCPs


What is the pressure, flowrate, and flowpath of the #2 Seal?

Pressure:
30 psig → 10 psig

Flowrate:
3 gpm → 3 gph

Suction:
Seal #1

Discharge:
RCDT

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31

LOT 201.02 RCS


What is Keff, RTP, and Tavg when the plant is in MODE 5?

Cold Shutdown:

Keff:
< 0.99

RTP:
0%

Tavg:
≤ 200 ˚F

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32

LOT 201.04 PZR, PRT, & RCDT


What is the setpoint the PZR Safety valves?

2485 psig ± 1%
+ 2% / - 3% (LCO 3.4.2.2)


3 safety valves

Keeps RCS ≤ 2735 psig w/:

  • Turbine Trip w/ NO Rx Trip
  • PORVs do NOT operate
  • Steam dumps do NOT operate

Note:
Relieves to PRT

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33

LOT 201.20 SSPS


What ESF actuations are NOT defeated when the master relay defeat switch is in the "defeat/cvi available" position?

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CVI
Will be defeated in "Defeat All" Position

COMS
LTOP Relief

PZR PORVs

PZR Level - Low (17%)
Letdown Isolation

VCT Level - Low (3%)
Swapover to RWST

Boric Acid Tank Level - Low 2 (29,584 gal)
Isolates Purification

RHR Flow - Low (925 gpm [5 sec TC])
Trips RHR pump

SI Auto Recirc
LHSI / HHSI takes suction on containment sump vice RWST

34

LOT 201.04 PZR, PRT, & RCDT


What drains directly into the RCDT?

RCP Seal #2 Leakoff
CVCS Valve Stem Leakoffs
Flange Leakoff
Excess Letdown
Alternate Path

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35

LOT 201.20 SSPS


What supplies power to the Solid State Protection System (SSPS) logic cabinets?

Channels 1 and 3 of Logic R:
DP1201 / DP1203
E1A11
(125 VDC for shunt trip)

Channels 2 and 4 of Logic S:
DP1202 / DP1204
E1B11
(125 VDC for shunt trip)


Rectifies 120VAC from DP1201 - DP1204 to 48 VDC and 15 VDC.


Note:

  • DP1201 supplies Actuation Train A
  • DP1203 supplies Actuation Train B
  • DP1204 supplies Actuation Train C

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36

LOT 201.15 RCS Temperature Monitoring


What parameters feed into OT∆T?

Tavg

∆T

Thermal Power

RCS Flow

PZR Pressure

∆I
Only used when ∆I exceeds +8%


∆I and PZR Pressure NOT used for OP∆T.

37

LOT 201.02 RCS


What is Keff, RTP, and Tavg when the plant is in MODE 3?

Hot Standby:

Keff:
< 0.99

RTP:
0%

Tavg:
≥ 350 ˚F

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38

LOT 201.04 PZR, PRT, & RCDT


What drains into the PRT?

RHR Pump Discharge Relief (3)
HHSI Pump Discharge Relief (3)
LHSI Pump Discharge Relief (3)
Safety Valves (3)
PORVs (2)
Seal #1 Return Relief (1)
CVCS Letdown Relief (CV-3100)
Head Vents

39

LOT 201.06 CVCS


What will close the letdown orifice header isolation valve (FV-011)?

CI ΦA
PZR Lvl - Low (17%)
LT-0465 OR LT-0468
Loss of Air
Loss of MCC E1C1


  • PZR Low Lvl on LT-0465 will close LCV-465 after 10 sec TD.
  • PZR Low Lvl on LT-0468 will close LCV-468 after 10 sec TD.

Note:
To reopen FV-011:

  • PZR LVL > 17% on LT-0465 AND LT-0468
  • LCV-465 AND LCV-468 open
  • CI Φsignal not present

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40

LOT 201.20 SSPS


Plant Conditions:

  • Rx Trip
  • One of the Rx trip breakers does not open (P-4 not met)

How would the operator stop SI equipment following an inadvertant SI actuation?

SI signal still active:
Pull to lock
Set / Reset → Set is dominant so SI reset will NOT work

SI signal clear:
Reset SI
(CP001)
Reset sequencer
(CP003)
Stop equipment
Latch/ Reset → Reset is dominant so SI reset will work


If SI signal comes back, SI equipment will restart if not in pull to lock.

41

LOT 201.03 Rx Vessel & Internals


How much RCS flow bypasses the fuel?

8.5% bypass flow


Rx Vessel Head (2.5%)
Fuel Thimble Guides (4%)
RCCAs (2%)
Sources / Poisons (2%)
Between CL and HL nozzles (1%)
Between Baffle Wall and Core Barrel Wall (0.5%)
Between Baffle Wall and Fuel (0.5%)

42

LOT 201.04 PZR, PRT, & RCDT


What is the maximum spray line ∆T allowed by the TRM?

621 ˚F


TRM 3.4.9.2 PZR Temperature Limits

Applicable: At all times


Note:
By procedure limited to 320 ˚F

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43

LOT 201.04 PZR, PRT, & RCDT


When will the rupture discs on the PRT relieve pressure?

100 psig


Normally pressurized with 3 psig N2.

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44

LOT 201.03 Rx Vessel & Internals


What are the neutron sources made of?

Primary Source:
Californium-252
Used for initial S/U

Secondary Source:
Antimony-Beryllium
Used for subsequent S/Us
Located in H-3 / H-13


CF-252 burns itself up after 1st S/U.

Antimony-Beryllium regenerates itself.

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45

LOT 201.26 Vibration & Loose Parts Monitoring


How many sensors are there in the vibration / loose parts monitoring system?

12 Sensors


Lower Reactor Vessel Head (2)

Upper Vessel Head (2)

S/Gs (2 per S/G)

  • Hot Leg Penetration
  • Intermediate Leg Penetration

46

LOT 201.04 PZR, PRT, & RCDT


What is the maximum amount of water that can be in the PZR in MODES 1-3?

≤ 1816 ft3
≈ 100% PZR LVL


LCO 3.4.3 PZR

Applicable in MODES 1-3


Note:
Total PZR volume is 2100 ft3

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47

LOT 201.25 IVMS


What equipment is monitored by IVMS?

Trips Associated:
Main Turbine
Thrust Collar Axial Displacement ± 40 mils [2/2]
S/G Feed Pumps
TURBINE Thrust Collar Axial Displacement ± 20 mils [2/2]

No Trips:
RCPs
CCPs
RHR Pumps
IVMS Cabinets
Temperature


Note:
The axial displacement trip for the S/G feed pumps is for the turbine NOT the pump.

48

LOT 201.41 ESF Load Sequencer


What is the MODE II sequence of starting loads?

1 Sec:
480 V Buses

15 Sec:
RCFC (11/12)

20 Sec / 25 Sec:
CCW / ECW

30 Sec:
AFW

35 Sec:
CR / EAB HVAC (Emergency MODE)
Essential Chilled Water Pump
Standby Essential Chiller

240 Sec:
Running Essential Chiller(s)

280 Sec:
Sequence Complete


Note:
Can manually initiate with unlabeled shielded red pushbutton on CP003.

49

LOT 201.06 CVCS


What are the flowrates of the CVCS letdown orifices?

120 gpm - 150 gpm
Normally in service
85 gpm - 100 gpm
25 gpm - 30 gpm


Flowrate based on 2235 psig in RCS.


Note:

  • FV-012 (120 gpm - 150 gpm) and FV-013 (85 gpm - 100 gpm) are air operated and fail close on loss of air.
  • FV-014 (25 gpm - 30 gpm) is a MOV.

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50

LOT 201.20 SSPS


What Rx trips are defeated when the master relay defeat switch is in the "defeat/cvi available" or the "defeat all" positions?

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SG Level - Low 2 (20%) [2/4 on 1/4]

2 Urgent Alarms
Alarms will still come in but no Rx Trip


  • ≥ P-11 will trip the Rx (PZR Pressure ≥ 1985 psig) [2/3]
    • Prevents S/U with no ESF actuations
  • SR HV OFF disabled
    • Prevents loss of Source Range while S/D

​Note:

  • Must go through the Rx trip position to reach "defeat/cvi available" or "Defeat all" positions.
  • Must pull out switch to operate

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51

LOT 201.04 PZR, PRT, & RCDT


What is the setpoint of the PZR PORVs?

2335 psig


  • PCV-655A: E1A11
  • PCV-656A: E1B11
  • Block valves are Class 1E 480V.

Both PZR PORVs AND Block valves required to be OPERABLE in MODES 1-3 (LCO 3.4.4)


Note:
Relieves to PRT

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52

LOT 201.41 ESF Load Sequencer


What are the different modes of the ESF sequencers?

MODE I: SI Signal
≥ 4 of 6 slave relays from ESF actuation cabinets giving SI signal

MODE II: LOOP
UV on 4.16 kV bus [2/4]

MODE III: SI AND LOOP
Conditions for MODE I and MODE II exist

53

LOT 201.04 PZR, PRT, & RCDT


What drains into the suction of the RCDT pump?

PRT
Cavity Drain
SI Accumulator Drains
RCS Loop Drains


Note:
RCDT Pump will auto stop on Flow - Low 2

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54

LOT 201.06 CVCS


What are the gal/% thumb rules for the VCT and PZR?

PZR:
68.3 gal/%

VCT:
33.9 gal/%


Used to calculate leak rate

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55

LOT 201.02 RCS


What are the design parameters of the RCS?

  • Flowrate
  • RTP
  • Tavg
  • Pressure

Flowrate:
107,800 gpm / RCP

RTP:
3853 MWt

Tavg:
567 ˚F - 593 ˚F
0% - 100%

Pressure:
2485 psig
NOP: 2235 ± 15 psig


Actual Tavg @ 100% is 592 ˚F

56

LOT 201.06 CVCS


At what pressure will the low pressure letdown relief valve (CV-3201) lift?

300 psig


Relieves to VCT.

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57

LOT 201.05 RCPs


What is the flowrate and flowpath of the #3 Seal?

Flowrate:
800 cc/hr → 400 cc/hr (x2)

Suction:
Seal Standpipe (RMW)

Discharge:
CTMT Normal Sump (400 cc/hr)
RCDT (400 cc/hr)

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58

LOT 201.20 SSPS


What pressure transmitter does tech specs allow you to bypass rather than place in trip?

Containment Pressure (PT-937)
Used for Containment Spray
Containment Pressure - High 3 (9.5#) [2/4]


Changes coincidence for Containment Spray to [2/3] vice [1/3] if channel was placed in trip.

59

LOT 201.20 SSPS


What are the bases for the different regions of the Reactor Core Safety Limits - 4 Loops in Operation COLR graph (Tavg vs RTP)? 

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Flat Region (Green)

Ensures that no bulk boiling will occur at the core exit so that the OPΔT and OTΔT trips remain functional


Steep Region (Pink)

Assures that DNB does not occur (DNBR is maintained >1.52)

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60

LOT 201.02 RCS


What are the piping penetrations off the intermediate legs?

Loop 1:
Drain to RCDT

Loop 2:
Drain to RCDT

Loop 3:
Drain to RCDT
CVCS Letdown

Loop 4:
Drain to RCDT
CVCS Excess Letdown


Loop drains go to suction of RCDT pumps. Do NOT go directly to RCDT.


Note:
Flange leakoff goes directly to RCDT.

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61

LOT 201.22 ESF


What accident(s) is ESF designed to protect against?

LOCA
Double guillotine shear of cold leg

Rod Ejection
Most reactive control rod

MSL Break
Double ended shear of largest piping

Fuel Handling Accident