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ATR SRO Level of Knowledge > Gland Seal and Warm Seal Systems > Flashcards

Gland Seal and Warm Seal Systems Flashcards

TRA00126

1
Q

What are the purposes of GSW and Warm Seals?

A

Prevent leakage from PCS through various pump and reactor tank penetration seals.
Lubricate and prevent damage to pump and reactor tank rotating seals.
Prevent deposition of crud on sealing surfaces.
Prevent build-up of sediment on Reactor Bottom Head and low flow areas of vessel.

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2
Q

What is the purpose of GSW?

A

Supply high pressure water to rotating seals and reactor tank penetrations.

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3
Q

When is GSW required to be operating?

A

GSW system must be online when the PCS is operating.

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4
Q

At what point during outage can the GSW be shut down?

A

After PCS depressurized and shutdown and ECPs have been turned off.

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5
Q

Why is the GSW system occasionally started during outage?

A

Maintain surge tank transmitter standing leg liquid full.
Maintain reactor tank level.
Support ECP operation to cool tank or reduce contamination levels.

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6
Q

What is the suction source for the GSW Pumps?

A

Gland Seal Water Feed Tank.

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7
Q

Describe GSW Pump parameters and control.

A

Discharges approximately 35 GPM at 510 psig to two different PCVs (DPCV-9-5 and PCV-9-15)

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8
Q

What is the function of DPCV-9-5?

A

Feeds to higher pressure areas of the PCS and controls pressure to 120 psig above reactor inlet pressure.

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9
Q

What is the function of PCV-9-15?

A

Feeds lower pressure areas of the PCS, controls pressure to approx 300 psig

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10
Q

Give supplies to Gland Seal Water Stations.

A

1/2/9 - DPCV-9-5
3A/3B/4 - PCV-9-15

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11
Q

What is the capacity of the GSW Feed Tank?

A

3000 gallons.

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12
Q

Where is the GSW Feed Tank located?

A

HX Mezzanine NW corner of HX room.

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13
Q

What is the purpose of the GSW Feed Tank?

A

Recycle PCS and N-16 effluent water for GSW pump suction.

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14
Q

What are the water sources to the GSW Feed Tank?

A

1) Bypass demin through LCV-1-3C @ 15 GPM
2) N-16 Effluent Water @ 12 GPM
3) LDW makeup through FCV-8-129 to control tank level between 40-60 inches.

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15
Q

Describe GSW Feed Tank Overpressure.

A

Plant air is supplied to the tank at 20 psig through PRV-6-365

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16
Q

Describe GSW Feed Tank vent path.

A

Gases purged from the tank are released to the HX exhaust grill through tank vent. HVE-4 then exhausts the HX area to the ATR Stack.

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17
Q

Draw GSW Feed Tank one-line.

A
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18
Q

Draw GSW One-Line.

A
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19
Q

When is makeup flow through FCV-8-129 to the GSW Feed Tank required?

A

If N16 is supplied from bypass demin then LDW must be added to GSW feed tank to maintain level.
If N16 is supplied from LDW no makeup through 8-129 is required.

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20
Q

What is the location of M-40/41 GSW Pumps?

A

Located in second basement NW corner of HDW room, north wall of gland seal cubicle.

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21
Q

What type of pumps are GSW Pumps?

A

Gear driven line centrifugal single stage 10550 RPM

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22
Q

What is the normal output flowrate and pressure of GSW Pumps?

A

35 GPM @ 500 psig.

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23
Q

Describe normal GSW Pump alignment.

A

Operating pump normally selected to E-9 Diesel bus. Standby selected to Comm power.
Standby pump starts on low pump discharge pressure of 405 psig.

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24
Q

What stops the GSW Pumps?

A

GSW Pumps stop on ESF-1 or ESF-4 on Hi Reactor Inlet Pressure PPS trip @ 385 psig.

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25
Q

Where are GSW Pumps powered from?

A

670-E-107 480 V MCC, north wall of HDW Room.

26
Q

What is the significance of GS Total Flow FI-9-166?

A

Instrument required to calculate PCS leak rate.

27
Q

What is the fail position of DPCV-9-5?

A

Fails open on loss of IA.

28
Q

What is the function of DPCV-9-5?

A

Regulate GSW Pump output to 120 psig above PCS inlet pressure (~490 psig)

29
Q

What is the fail position of PCV-9-15?

A

Fails open on loss of IA.

30
Q

What controls PCV-9-15 position?

A

PIC-9-15

31
Q

Where is PCV-9-15 located?

A

South wall HDW room by main entrance.

32
Q

Which GSW Stations supply PCPs?

A

Station 3A - M-6 and M-7
Station 3B - M-8 and M-9

33
Q

What is normal GSW flow to PCPs?

A

2.5 GPM

34
Q

What is normal GSW flow to ECPs?

A

1.5 GPM

35
Q

What is indicated by flow at GSW Station #1?

A

Leakage from reactor top head seals.

36
Q

What is the purpose of GSW Stations 2?

A

Indicates flow to OSCC rotating seals.

37
Q

What is the purpose of GSW station 14?

A

Indicate leakage from OSCC seals.

38
Q

What is the purpose of the GS to Warm Seal Crosstie?

A

Can be opened to supply the Warm Seal Water system stations during outages when the warm seal pumps are unavailable.

39
Q

What is the function of GT-18-9?

A

N-16 to GSW X-tie. Aligns N-16 pump discharge to GSW pump discharge. Valve normally closed with blind flange installed.

40
Q

What are the purposes of the Warm Seal Water System?

A

1) Supply HP water to rotating seals and reactor tank penetrations located in remote areas where primary water leakage would be less of a problem than seals supplied by GSW.
2) Secured during outages when PCS is depressurized and bypass demin isolated.
3) Pumps started during PCS startup when pressure >150 psig and bypass demin has been placed in service.

41
Q

Draw WSW One-Line

A
42
Q

What is the discharge flow/pressure for WSW Pumps?

A

Take suction from return line of bypass demin and discharge 60 GPM at 420 psig.

43
Q

How is WSW pressure controlled?

A

Pumps discharge flows through strainers to DPCV-9-7, which controls pressure to 120 psig over reactor outlet pressure and supplies WSW Stations 5/6/10/12 and bottom head flush.

44
Q

Describe WSW Booster Pumps.

A

Located in NW Corner of HDW Room in GSW/WSW Cubicle.
Centrifugal Pumps
60 GPM at 420 psig.

45
Q

What is the power supply to WSW Booster Pumps?

A

M-82/83 WSW Pumps are supplied by E-15 Diesel/Comm Bus.

46
Q

What is the purpose of WSW Station #5?

A

Indicate leakage from reactor bottom head seals.

47
Q

What is the purpose of WSW Stations 6/7?

A

Safety Rod Drive Seal Supply.

48
Q

What is the purpose of WSW Station 10?

A

Safety rod snubber tube flush supply. Normally 13 GPM.

49
Q

What is the purpose of WSW Station 12?

A

Neck Shim drives Housing Seals. Normal flow is 1 GPM on each rod seal. High flow is indication of seal leakage.

50
Q

What is the purpose of WSW Bottom Head Flush?

A

Prevents sediment build-up on the reactor bottom head. Normally 40 GPM.

51
Q

How does Bottom Head Flush flow enter the reactor vessel?

A

Bottom head flush enters RV through the NE Bottom Head Emergency Fire Water Injection 2-inch pipe.

52
Q

How does GSW respond to ESF-1 or ESF-4?

A

High inlet pressure ESF trips GSW Pumps.
Pump restart is prevented until the condition is cleared and the ESF relays have been reset at the P-11 panel in the RCR or at the ESF cabinets in the switchgear room.

53
Q

How does GSW respond to loss of commercial power (ERP-0.3)?

A

If in normal lineup, operating pump selected to Diesel will continue to operate.
If in alternate lineup, operating pump selected to Diesel will continue to operate.
GSW alarms will be received as the GSW DP control valve and PCS respond to changes in pressure from Primary Coolant Pump loss and restart.

54
Q

How does WSW respond to loss of commercial power (ERP-0.3)?

A

WSW Pumps are powered from E-15 and should not be impacted from a loss of commercial power regardless of the electrical lineup.
WSW alarms will be received as the WSW dpcv and the PCS respond to changes in pressure from PCP loss and restart.

55
Q

How does GSW respond to a loss of Diesel power (ERP-0.4)?

A

Running GSW pump will stop and standby will start when pump pressure drops to 405 psig.
Various GSW flow and pressure alarms will be received.

56
Q

How does WSW respond to a loss of Diesel power (ERP-0.4)?

A

Diesel comm bus will experience a momentary loss of power and so both warm seal booster pumps will be inop until E-15 is energized from E-7 through E-228.
Standby pump will start once diesel comm power is restored and the dp between reactor outlet pressure and DPCV-9-7 drops to 80 psid.
Various alarms.

57
Q

How does GSW respond to a loss of Comm and Diesel Power (ECAP-0)?

A

If on normal alignment, diesel selected operating pump will continue to run on 480V diesel UPS battery power until batteries are depleted.
Power will be unavailable to both the operating and standby GSW pumps until a power source is restored.
Battery powered ECP will be operating without the benefit of GSW lubrication to seals.

58
Q

How does WSW respond to ECAP-0?

A

Operating WSW Pump will continue to operate on battery until depleted.

59
Q

How does GSW respond to loss of IA (AOP-6.1)?

A

LCV-1-3C degas tank to GSW feed will fail shut.
FCV-8-129 GSW Feed Tank fill valve will fail shut.
DPCV-9-5 will fail open.
PCV-9-15 will fail open.
If PPS in pressurized mode, op GSW pump will stop, and standby will be locked out by PPS hi inlet pressure ESF trip until relays are manually reset.

60
Q

How does WSW respond to loss of IA (AOP-6.1)?

A

Standby warm seal water booster pump will start automatically.
DPCV-9-7 fails open.
Both operating warm seal water booster pumps must be secured.

61
Q

Draw one-line of combined GSW/WSW system.

A

ATR SRO Level of Knowledge (4 decks)

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