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Systems Test 3 > LOT 201.13 ECW > Flashcards

LOT 201.13 ECW Flashcards

1
Q
  • LOT 201.13 ECW*
    • *

What will auto start the screen wash booster pump?

A
  • Auto Start:*
  • *SI**
  • *Traveling Screens Start**

Must be manually secured.

MCC switch in LOCAL eliminates ALL Auto Functions.

  • Note:*
  • Starting screen wash booster pump will auto open screen wash valve unless MCR switch in close.*
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2
Q
  • LOT 201.13 ECW*
    • *

What will auto start/stop the ECW pump room ventilation fans?

A
  • Auto Start: (Both Fans)*
  • *ECW Pump Room Temp - High (94 ˚F)**
  • *ECW Pump Start**
  • Auto Stop: (Both Fans)*
  • *ECW Pump Room Temp < 94 ˚F**

Max temp is 104 ˚F

  • Note:*
  • If fan started due to ECW pump start, then fans must be manually secured. (Locally / CP022)*
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3
Q
  • LOT 201.13 ECW*
    • *

What does the accident analysis assume for the ECW system?

A

Loss of 1 train in both units

LOOP

Normal Operation: 2 Trains of ECW and 1 Train of CCW

  • Note:*
  • 2 Trains of ECW required for EAB HVAC requirements.*
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4
Q
  • LOT 201.13 ECW*
    • *

What will auto start/stop the ECW traveling screens?

A
  • Auto Start:*
  • *SI**
  • *High Screen D/P (5.5”) w/ Sreen Wash Pressure ≥ 63 psig**
  • Resets at 4.5” (Will run for 4 mins after reset)*
  • Auto Stop:*
  • *Sreen Wash Pressure < 63 psig**
  • N/A for SI*
  • *∆Level < Setpoint**
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5
Q
  • LOT 201.13 ECW*
    • *

Describe what happens to the ECW blowdown valves when a SI occurs?

A
  • *Blowdown valves shut**
  • Once SI clears, must take valves to shut then back to auto on CP002*

CP002 switch in AUTO:

  • ECW Train 2A: Valve opens
  • ALL other ECW Trains: Cycles Open/Shut with ECW pump starting/securing

Valve physically located on MAB 10’ at ECW Sump. (No local switch)

Note:
By procedure, every blowdown valve with exception of train 2A is maintained in the CLOSE position on CP002

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6
Q
  • LOT 201.13 ECW*
    • *

What will happen in the ECW system once a ECW pump is started?

A

Starts self cleaning strainer motor

  • *Starts to Open Discharge Valve after 10 sec**
  • If not open after 25 sec, pump trips (N/A for SI)*

Opens chemical injection valve for associated bay

  • *Opens Blowdown Valves (N/A for train 2A)**
  • Maintain CP002 switches in CLOSE so doesn’t really happen*
  • *Starts ventilation fans**
  • Must be manually secured*
  • Discharge Valve MCC switch in local prevents discharge valve opening when ECW pump starts.
  • Self Cleaning strainer does not have switch in MCR.
  • Note:*
  • Discharge valve will shut 2 mins after ECW pump secures to prevent draining ECW piping to ECW pond and thus preventing water hammer on pump S/U.*
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7
Q
  • LOT 201.13 ECW*
    • *

What loads does ECW supply?

A

Essential Chillers​

  • ESF DGs:*
  • *Jacket Water HX**
  • *Turbo Charger Combustion Air Cooler**
  • *Lube Oil HX**
  • CCW:*
  • *CCW HX**
  • *CCW Pump Supplementary Cooler**
  • Cools area cooler and CCW pump motor*
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8
Q
  • LOT 201.13 ECW*
    • *

What will cause a CCW standby train not selected alarm on CP002?

A

2 ECW/CCW train selector switches in “OFF”

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9
Q
  • LOT 201.13 ECW*
    • *

What MCCs are located in the ECW intake structure?

A

MCC E1A3

MCC E1B3

MCC E1C3

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10
Q
  • LOT 201.13 ECW*
    • *

What lubricates the ECW pump bearings?

A

Water being pumped flows across the bearings on it’s way up the pump column

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11
Q
  • LOT 201.13 ECW*
    • *

What is the DBA for the ECW pond embankments?

A
  • North Embankment:*
  • *Colorado River Dam Failures**
  • South Embankment:*
  • *Break in Cooling Resevoir**
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12
Q
  • LOT 201.13 ECW*
    • *

Does ECW flow the tubes or the shell of the CCW HX?

A

Tubes

Minimizes debris in the shell of HX

  • Note:*
  • CCW is a higher pressure than ECW.*
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13
Q
  • LOT 201.13 ECW*
    • *

What components in the ECW system have a Bypass/Inop alarm on CP002?

A
  • ECW Pump:*
  • *Pump** (CP002/MCC)
  • *Discharge MOV** (CP002/MCC)
  • *Strainer** (MCC only)
  • Traveling Screen:*
  • *Pump** (CP002/MCC)
  • *Discharge Valve** (CP002/MCC)
  • *Traveling Screen** (CP002/MCC)
  • Ventilation:*
  • *Fans** (CP022/MCC)
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14
Q
  • LOT 201.13 ECW*
    • *

What provides makeup to the ECW pond?

A
  • Normal:*
  • *Well Water**
  • Alternate:*
  • *Unit 2 ECW Sump via ECW 2A return line**
  • Unit 1 Sump is normally aligned to Unit 1 CW Return.
  • Unit 2 Sump can be aligned to Unit 1 CW Return.
  • Note:*
  • ECW Sump located on MAB 10’ in Essential Chiller Train C Room.*
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15
Q
  • LOT 201.13 ECW*
    • *

What is the minimum level and temperature of the ECW pond as required by LCO 3.7.5 Ultimate Heat Sink?

A
  • Level:*
  • *≥ 25.5 ft**
  • Max Level 26 ft (FSAR)*
  • Temperature:*
  • *≤ 99 ˚F**

Pond sized to have a 30 day cooling water supply to safely shutdown and cooldown both Units while maintaining a heat sink for heat removal

  • Note:*
  • ECW Bay LVL indication and alarms located on CP002
  • ECW Bay LVL - Low 2 (14.96 ft) for LCO 3.7.5 entry.
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16
Q
  • LOT 201.13 ECW*
    • *

What components in the ECW system have a fail to actuate alarm on CP002?

A
  • ECW Pump:*
  • *Pump Fails to Start**
  • *Discharge Valve Fails to Open**
  • *Blowdown Fails to Close**
  • *Strainer Fails to Start**
  • Traveling Screen:*
  • *Pump Fails to Start**
  • *Discharge Valve Fails to Open**
  • *Traveling Screen Fails to Start**
  • Ventilation:*
  • *Fans Fails to Start**
  • *Dampers Fails to Open**
  • Note:*
  • Although the circuitry is still in place, Tech Specs no longer require opening of the screen wash valve or the start of the travelling screen and screen wash booster pump following a SI.*
17
Q
  • LOT 201.13 ECW*
    • *

What will auto start/stop the ECW pumps?

A
  • Auto Start:*
  • *ESF DG Sequencer (25 Sec)**
  • MODES I, II, III*
  • *CCW Header Pressure - Low (76 psig) [15 sec TD]**
  • *ECW Header Pressure - Low (30 psig) [2/3] [15 sec TD]**
  • Low Pressure on other two trains*
  • Auto Stop:*
  • *Discharge Valve not open after 25 sec**
  • N/A for SI*
  • Note:*
  • 15 Sec TD is to prevent inadvertant train S/U during transient conditions.
  • Discharge valve must be open after 25 sec b/c ECW pump does not have a recirc line to protect the pump

Systems Test 3 (17 decks)

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