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Systems > Service Water > Flashcards

Service Water Flashcards

1
Q

P-7A/B/C Overload Trip Setpoint

A

92 Amps

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2
Q

P-7A/B/C Amp Guages

A

C-08

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3
Q

P-7A/B/C Basket Strainer High DP

A

7 psid up to 8 second time delay

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4
Q

Low Critical Service Water Header Pressure

A

45 PSIG

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5
Q

Non-Critical SW Low Pressure

A

45 PSIG

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6
Q

A Critical Header Loads

A

P-7A:

  • VC-10
  • 1-2 EDG
  • VC-1A
  • E-18C
  • VHX-27A (East ESS)
  • ESS Pumps Cooling
  • E-54A/B
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7
Q

B Critical Header Loads

A

P-7C:

  • VHX-1/4
  • Cntmt Fire Wheels
  • VC-11
  • 1-1 EDG
  • VC-1B
  • E-18A
  • VHX-27B (West ESS)
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8
Q

F-4B/C Traveling Screens Wash Cycle

A

Once every 8 hrs for 12 minutes or on high DL of 6 inches.

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9
Q

How does F-13A/B Operate?

A

Off, Intermittent (1.5 PSID or 4 times per day), and Continuous

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10
Q

What is the design and capacity of P-7A/B/C?

A

Virtical turbine pumps. 8,000 GPM at 140 feet (60 psi)

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11
Q

What is P-7A/B/C Power Supply?

A

D-Bus

  • P-7A/C

C-Bus

  • P-7B
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12
Q

What pumps draw from the SW Bay?

A

P-7A/B/C, P-9A, P-9B, P-4, P-13

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13
Q

What is P-7A/B/C NPSH Requirement?

A

31 feet. At 85F and 568.25’ NPSH Available is 56 feet

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14
Q

What is Minimum Lake Level for P-5 to supply Intake Structure?

A

578’ 4”

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15
Q

How do you arm the Standby Feature of a SW Pump?

A

Press the Amber Standby Light.

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16
Q

What starts a standby SW pump?

A

40 psi on pressure switch in that pumps start circuit. Pressure switch (1 each) is located on other pumps discharge.

17
Q

What is normal SW pump discharge pressure?

A

70 - 85 psi

18
Q

What is happenning at 90 psi discharge pressure?

A

Potential low flow condition and pump damage.

19
Q

Describe the intake crib

A

2/3 mile out (3300 feet) and 20 feet down, passing up to 390,000 gpm

20
Q

What happens if you arm a SW pump for standby with only 1 pump operating?

A

The pump will start as it sees low discharge pressure on the other non operating pump.

21
Q

What are the SIAS effects on system?

A
  • All 3 SW pumps start
  • CV-1359 isolates non-critical loads
  • VHX 1-4 High Caps open/seal-in
  • VHX-4 inlet closes,
22
Q

What happens on loss of offsite power?

A

P-7A/B start after 10 seconds

P-7C after 26 seconds via the normal shutdown sequencer.

23
Q

What happens on loss of offsite power with SIAS?

A

DBA sequencer.

  • P-7A/B start after 10 seconds
  • P-7C after 26 seconds
24
Q

What happens to SW on RAS?

A
  • CV-0823 and CV-0826, CCW Heat Exchanger High Caps will go to the hard-stop postions and indicate red only.

Approximately 3300 GPM/Hx.

  • CV-0821 and CV-0822, CCW TCV’s go closed
25
Q

Which SW pumps have a RLTS?

A

P-7B

26
Q

What are CR indications for SW system?

A
  • Service Water Pump amps
  • D/Gs outlet temperatures
  • CCW Hx outlet temperatures.
  • SW Critical header pressures
  • ESS Room Cooler temp indications
  • SW inlet temp (TR-5370)
  • SW outlet temp (TR-5370)
  • Radiation Detector, RIA-0833
27
Q

At what SW Pump gland tempeature do you take action?

A

120 degrees notify maintenance. 140 - have packing adjusted allow more top of packing leakoff.

Packing adjustments performed while the pump is running do NOT render the
pump inoperable; therefore, pump testing or redundant equipment testing is NOT
required.

28
Q

When is the UHS Operable?

A

UHS Operable

Required Mode 1 -4

Temperature <= 85F

  • DWO Limit 83.5F

Level >= 568.25 ft (top of SW Bay Sluice Gate)

  • DWO Limit - 569 ft
29
Q

When does the Max DBA Heat Load occur?

A

Max DBA Heat Load

  • Maximum post accident heat load occurs between 20 to 40 minutes after a design basis Loss of Coolant Accident (LOCA).
  • Near this time, the plant switches from injection to recirculation, and the containment cooling systems are required to remove the core decay heat.
30
Q

What is the NPDES Permit limit?

A

NPDES Permit limit

  1. 2 million gallons per day (mg/d).
    * Operation of three (3) Service Water Pumps and two (2) Dilution Water Pumps simultaneously with the plant off-line may result in exceeding this limit.
31
Q

How are the critical header cross-tie and isolation valves controlled?

A

Closing more than one of the following control valves with the plant in Mode 1, 2, 3,
or 4 is NOT allowed AND the time any one of these valves is closed shall be
minimized:

  • CV-0844 HEADER B (S)
  • CV-0845 HEADER A (N)
  • CV-0846 HDR CROSSTIE
  • CV-0857 HDR CROSSTIE
32
Q

How can SWS changes impact SFP Temperature?

A

SFP Temperature

Any of the following actions may affect Spent Fuel Pool (SFP) temperature:

  • Changing position of CV-0823 (CV-0826), Component Cooling Water Hx E-54A (E-54B) Outlet
  • Changing position of CV-1359, Non-Critical Service Water Isolation
  • Changing CCW System heat load (isolating Shut Down Cooling Hx)
33
Q

What is the maximum service water flow through a CCW heat exchanger?

A

CCW Max SW Flow

7050 GPM to prevent damage to tubes

Corresponds to 71 in H2O on FI-0823/0824.

34
Q

What are frazil ice conditions?

A

Frazil ice conditions

  • Water temperature is at or below 33F (TI-1319)
  • Air temperature is at or below 25F (PPC page 351)

Systems (53 decks)

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