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Catawba Nuclear Station > Liquid Waste System(WL) > Flashcards

Liquid Waste System(WL) Flashcards

1
Q

What is the purpose of the Liquid Waste System(WL)?

A
  1. The purpose of the Liquid Waste System is to collect, segregate, and process all radioactive and potentially radioactive liquids generated in the plant.
  2. In general, all rector grade liquids are recycled, and all non-reactor grade liquids are precessed and disposed of in accordance with applicable regulations.
  3. The system is designed to control and minimize releases of radioactivity to the environment.
  4. The following are methods used to process Liquid Waste:
    A. Filtration
    B. Deminerlizers
    C. Holdup and Decay
    D. Dilution
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2
Q

What is the system designator for the Liquid Waste System?

A

WL

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3
Q

What is the system designator for the Reactor Coolant Drain Tank?

A

NCDT

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4
Q

What is the system designator for the Waste Drain Tank?

A

WDT

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5
Q

What is the system designator for the Waste Evaporator Feed Tank?

A

WEFT

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6
Q

What is the system designator for the Laundry and Hot Shower Tank?

A

LSHT

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7
Q

What is the system designator for the Floor Drain Tank?

A

FDT

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8
Q

What is the system designator for the Mixing and Settling Tank?

A

MST

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9
Q

What is the system designator for the Ventilation Unit Condensate Drain Tank?

A

VUCDT

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10
Q

What is the system designator for the Steam Generator Drain Tank?

A

SGDT

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11
Q

What is the system designator for the Monitor Tank Building?

A

MTB

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12
Q

What is the system designator for the Auxiliary Monitor Tank?

A

AMT

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13
Q

What are the categories of Liquid Waste?

A
  1. Deaerated Recyclable Liquids
  2. Aerated Recyclable Liquids
  3. Aerated Non-Recyclable Liquids
  4. Potentially Radioactive Soapy Liquids
  5. Lab Samples
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14
Q

What is the purpose of the Laundry and Hot Shower Tank Subsystem(LHST)?

A

The purpose of the LHST is to collect soapy liquids that are potentially radioactive and are not recyclable

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15
Q

What are the sources of liquid to the Laundry and Hot Shower Tank?

A
  1. Decon Area Showers and hand washes
  2. Auxiliary Building Service Sinks
  3. Men’s and women’s lavatory sinks
  4. Laundry machines
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16
Q

What is the normal release path for the Laundry and Hot Shower Tank?

A

The LHST is pumped to the Waste Monitor Tanks(WMTs), and released via 0EMF-49 to the RN system.

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17
Q

What is the alternate flow path for the Laundry and Hot Shower Tank?

A

The LHST can also be pumped to the Recycle Monitor(RMT) Tank, or to the Monitor Tank Building(MTB)

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18
Q

How many pumps are there in the LHST Subsystem, what is the power supply, and what will cause a pump trip?

A
  1. One pump
  2. SMXA
  3. Low level in the LHST(6”)
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19
Q

What is the purpose of the Floor Drain Tanks Subsystem(FDT)?

A

Collects liquids that are potentially radioactive but are generally suitable for plant discharge without treatment?

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20
Q

What is the motive force for water leaving the Floor Drain Tank?

A

Gravity flow

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21
Q

Where does the overflow from the Floor Drain Tank go?

A

Waste Evaporator Feed Tank Sump B

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22
Q

What drains to the Floor Drain Tank?

A

Inputs are via a pre-strainer:
1. Pre-strainer A receives input from everything but the 560’ elevation including:
A. Floor Drain Sump A and B
B. U1 and U2 Upper Head Injection Sump
2. Pre-strainer B receives input from the 560’ elevation only

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23
Q

What are the discharge paths of the Floor Drain Tank?

A
  1. WEFT, then to the MTB
  2. SGDT B, then to MTB
  3. Via MTB process equipment to the AMT
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24
Q

How many pumps are there in the FDT Subsystem, what is the power supply, and what will cause a pump trip?

A
  1. One pump for the station
  2. SMXA
  3. Low level in the FDT(11%)
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25
Q

How many Floor Drain Sumps are there, and what are their designations?

A

There are four shared Floor Drain Sumps: A, B, C, and D

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26
Q

What type of liquid is collected in the ‘A’ and ‘B’ Floor Drain Sumps?

A

the ‘A’ and ‘B’ sumps collect contaminated liquid waste and discharge through the ‘A’ pre-strainer/Oil and Grit Removal Tank(OGRT) to the Floor Drain Tank during normal operations

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27
Q

What type of liquid is collected in the ‘C’ and ‘D’ Floor Drain Sumps?

A

The ‘C’ and ‘D’ sumps collect non-contaminated liquid from Auxiliary Building drains and normally discharge to the Turbine Building Sumps through a radioactive monitor

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28
Q

What happens if activity is detected in the water coming from the ‘C’ and ‘D’ Floor Drain Sumps?

A

If activity is detected by 1(2)EMF-52 the drains coming from the ‘C’ and ‘D’ Floor drain sumps are automatically diverted from the Turbine Building Sumps to the ND/NS Sump

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29
Q

How many Floor Drain Sump Pumps are there?

A

There are 8 total Floor Drain Sump Pumps, 2 per sump

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30
Q

What are the Floor Drain Sump Pump power supplies?

A
  1. A1 and B1 - SMXA
  2. A2 and B2 - SMXB
  3. 2C1 and 2C2 - 2MXM/2MXN
  4. 1D1 and 1D2 - 1MXM/1MXN
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31
Q

How will the Floor Drain Sump Pumps operate in the AUTO position?

A
  1. High level - one pump auto starts(alternating)
  2. High-High level - both pumps auto start
  3. Low level - both pumps off
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32
Q

What are the automatic actions associated with an EMF-31 trip 2 condition?

A
  1. All Turbine Building Sump Pumps trip

2. Can be bypassed using the override switch

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33
Q

What are the automatic actions associated with an EMF-52 trip 2 condition?

A

Aligns the discharge of Floor Drain Sump ‘D’ and ‘C’, and CA Sumps to the ND/NS Sump

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34
Q

Where do the Interior Doghouse Drains go?

A

Drain the respective units CA Pump Room(Floor Drain Sump C or D)

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35
Q

What is unique about the Interior Doghouse Drain line?

A

The drain line has a Restrictor Plate to limit the rate of flow and prevent flooding in the CA Pump Rooms

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36
Q

What is the purpose of the Waste Evaporator Feed Tank Subsystem(WEFT)?

A

The purpose of the Waste Evaporator Feed Tank Subsystem is to collect non-recyclable, aerated, and tritiated waste liquids.

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37
Q

What liquids drain to the Waste Evaporator Feed Tank?

A
  1. Incore and Containment Sumps
  2. WEFT Sumps ‘A’ and ‘B’
  3. Miscellaneous Auxiliary Building equipment drains
  4. NCDT during refueling
  5. ND/NS sump pumps
  6. Floor Drain Tank overflows
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38
Q

Where do the Waste Evaporator Feed Tank Sumps go?

A

Water from the two WEFT Sumps are pumped to the WEFT because they collect primary equipment drains at an elevation below the WEFT

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39
Q

How many Waste Evaporator Feed Tank Sump Pumps are there, and what are they powered from?

A
  1. Two pumps, one pump per sump

2. SMXA/SMXB

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40
Q

What will cause a Waste Evaporator Feed Tank Sump Pump to automatically trip?

A

Low sump level(10%)

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41
Q

How is each Waste Evaporator Feed Tank Sump Pump controlled, and from where?

A
  1. WEFT Pump A is controlled from the Waste Processing Liquid Panel with a Trip-Close switch
  2. WEFT Pump B is controlled from the Auxiliary Waste Processing Panel with a Man-Off switch
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42
Q

What is the design basis of the Waste Evaporator Feed Tank capacity?

A

The WEFT is designed for a 10gpm leak from one unit for 8 hours

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43
Q

Where does the Waste Evaporator Feed Tank overflow to?

A

Floor Drain Sump A

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44
Q

What is the discharge paths for the Waste Evaporator Feed Tanks?

A
  1. To the Steam Generator Drain Tank, then to the MTB for processing and release
  2. Can be drained to Floor Drain Sump A
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45
Q

What is the purpose of the Steam Generator Drain Tank Subsystem(SGDT)?

A
  1. The design purpose of the SGDTs is to collect radioactive waste generated during shutdown for S/G tube leaks, and S/G testing and inspection
  2. The SGDTs are normally used as storage capacity for WL prior to processing for release
46
Q

What is unique about the piping to and from the Steam Generator Drain Tanks?

A

The piping going to and from SGDTs has heat tracing required for freeze protection

47
Q

How many Steam Generator Drain Tank Pumps are there, and where are they powered from?

A
  1. There are two pumps, one per unit

2. 1MXZ/2MXZ

48
Q

What is the discharge path for the Steam Generator Drain Tanks?

A

The Steam Generator Drain Tanks normally discharge to the MTB, and then to the RL system through 0EMF-57 and 1WLX28

49
Q

What is the purpose of the Reactor Coolant Drain Tank Subsystem(NCDT)?

A

The purpose of the NCDT is to collect all deaerated recyclable liquids with entrained fission gases generated from the Reactor Building

50
Q

What are the sources of the liquid that drain to the Reactor Coolant Drain Tank?

A
  1. NCP’s #2 and #3 seal leakoff
  2. Piped up valve leakoff
  3. Excess Letdown Heat Exchanger effluent when aligned to NCDT
  4. Miscellaneous equipment drains
51
Q

How many Reactor Coolant Drain Tanks are there?

A

One per unit

52
Q

What is the Reactor Coolant Drain Tank pressurize with?

A

The NCDT is pressurized with nitrogen to 2-3psig

53
Q

What are the basic steps for replacing a nitrogen bottle that provides overpressure on the Reactor Coolant Drain Tank?

A
  1. Close the cylinder valve on the empty cylinder
  2. Close the cylinder isolation valve for the empty cylinder
  3. Open the cylinder isolation valve for the full cylinder
  4. Open the cylinder valve for the full cylinder
  5. Replace the empty cylinder with a standby
  6. Order a new cylinder
54
Q

Where is the Reactor Coolant Drain Tank discharged to?

A
  1. Normally the NCDT is discharged to the Recycle Holdup Tanks(RHT) in the Boron Recycle System(NB) for reuse
  2. During the refueling outage discharge is to the Waste Evaporator Feed Tanks(WEFT) because nearly all Reactor Building system are aerated
55
Q

How many Reactor Coolant Drain Tank Pumps are there, and where are they powered from?

A
  1. There are two pumps per unit, only one is required for normal operation
  2. MXY/MXZ
56
Q

What is the design drain rate for the Reactor Coolant Drain Tank Subsystem?

A

The design is to be able to drain the NC system in less than 8 hours

57
Q

Where are the Reactor Coolant Drain Tank Pumps controlled from?

A

MC-11 in the Control Room

58
Q

What temperature is the Reactor Coolant Drain Tank maintained at by the Reactor Coolant Drain Tank Heat Exchanger, and what system provides the cooling water?

A
  1. 170F

2. Component Cooling System(KC)

59
Q

What is the purpose of the Waste Drain Tank Subsystem(WDT)?

A

The purpose of the WDT is to collect all deaerated recyclable liquids with entrained fission product gases that are generated in the Auxiliary Building

60
Q

What are the sources of liquid that drain into the Waste Drain Tanks?

A
  1. Valve leakoffs
  2. Equipment drains in the NB, ND, and NV systems
  3. Flushes from exhausted filters and demineralizers
61
Q

What is the purpose of the diaphragm in the Waste Drain Tanks?

A

The diaphragm separates the liquid from the atmosphere and keeps gases in solution

62
Q

How many Waste Drain Tank Pumps are there, and where are they powered from?

A
  1. There are two Waste Drain Tank Pumps

2. SMXA/SMXB

63
Q

What are the discharge paths for the Waste Drain Tanks?

A
  1. If the Waste Drain Tank water quality is unacceptable the contents are pumped to the Waste Evaporator Feed Tank(WEFT)
  2. If the Waste Drain Tank water quality is acceptable the contents are pumped to the Recycle Holdup Tank(RHT) for reuse as makeup water.
64
Q

What is the purpose of the Mixing and Settling Tank Subsystem(MST)?

A

The purpose of the Mixing and Settling Tank is used to receive inputs from the Ultrasonic Cleaners in the decon room

65
Q

Where does the water in the Mixing and Settling Tank go?

A

The water is normally gravity drained through the available pump casing to Waste Evaporator Feed Tank Sump ‘B’

66
Q

What is the purpose of the Ventilation Unit Condensate Drain Tank Subsystem(VUCDT)?

A

The purpose of the VUCDT is to collect condensation from containment ventilation units

67
Q

Where are the Ventilation Unit Condensate Drain Tanks located?

A

They are located in the respective unit’s CA Pump Rooms

68
Q

What prevents communication of the Containment atmosphere with the Auxiliary Building atmosphere?

A

There is a loop seal in the line from Containment leading to the VUCDT

69
Q

What will cause the Containment Isolation Valve in the drain line to the Ventilation Unit Condensate Drain Tank?

A

Phase ‘A’ Containment Isolation signal

70
Q

What does the OAC monitor in relation to the Ventilation Unit Condensate Drain Tank?

A
  1. Level
  2. Flow
  3. Average rate of change if VUCDT flow over a ten minute period
71
Q

What changes in Ventilation Unit Condensate Drain Tank would indicate a problem?

A
  1. An increase in flow to the VUCDT with no increase in radioactivity indicates leakage fro a non-radioactive system, probably a steam leak
  2. An increase in flow to the VUCDT and an increase in radioactivity would indicate leakage from a radioactive system
72
Q

How many Ventilation Unit Condensate Drain Tank Pumps are there, and how are they operated?

A
  1. There are two VUCDT Pumps per tank

2. The pumps are manually operated when the tank reaches a high level

73
Q

What is the time limit associated with operating the Ventilation Unit Condensate Drain Tank Pumps?

A

The VUCDT Pumps are limited to 40 minutes of runtime every 60 minutes

74
Q

What is the discharge path for the Ventilation Unit Condensate Drain Tanks?

A

The normal discharge path is to pump the contents to the Recycle Monitor Tanks(RMT), then through 0EMF-49 to the RN system and out to the lake via RL.

75
Q

What is the purpose of the Waste Monitor Tank Subsystem(WMT)?

A

The purpose of the Waste Monitor Tank Subsystem is to collect fluid and store it until it is ready to be released

76
Q

What are the sources of liquid to the Waste Monitor Tanks?

A
  1. Laundry and Hot Shower Tank

2. Alternate path for the Floor Drain Tank and the Ventilation Unit Condensate Drain Tank

77
Q

What is the discharge path for the Waste Monitor Tanks?

A

The discharge path is through 0EMF-49 to the RN system, and then out to the lake via the RL system

78
Q

What is the purpose of the Recycle Monitor Tanks Subsystem(RMT)?

A

The Recycle Monitor Tanks are used as holdup tanks

79
Q

How many Recycle Monitor Tanks are there?

A

There are two Recycle Monitor Tanks

80
Q

What are the sources of liquid to the Recycle Monitor Tanks?

A

Laundry and Hot Shower Tank via the Waste Monitor Tanks if needed

81
Q

What is the discharge path for the Recycle Monitor Tanks?

A

The discharge path is through 0EMF-49 to the RN system, and then out to the lake via the RL system

82
Q

Where are Loop Seals provided?

A

Loop seals are provided wherever through-line gaseous leakage is unacceptable due to:

  1. Fission product gas containment
  2. Deaerated water storage
  3. Maintained differential pressure, when tanks are maintained at a different pressure than ambient
83
Q

What are the six basic applications of Loop Seals?

A
  1. Tank loop seals
  2. Annulus drain header loop seals
  3. VUCDT header loop seal
  4. Air handling filter train loop seal
  5. Unit vent drain loop seal
  6. Various air handling fan coil unit drain loop seals
84
Q

How many Auxiliary Feedwater Pump Pit Sumps are there, and how many pumps for each sump?

A
  1. There are two Motor Driven CA pump sumps per unit

2. There is one sump pump for each sump

85
Q

What is the normal and alternate discharge path from the Auxiliary Feedwater Pump Sumps?

A
  1. The normal discharge path is to the Turbine Building Sumps through EMF-52
  2. The alternate flow path is to the ND/NS Sump which is automatically aligned on an EMF-52 trip 2 signal
86
Q

How many Turbine Driven CA Pump Sumps are there, and how many pumps for each sump?

A
  1. There is one CAPT Sump per unit

2. There are two pumps for each CAPT sump

87
Q

What are the sources of liquid to the Turbine Driven Pump Sumps?

A
  1. Condensate drains from the CAPT

2. Oil Cooler flow from the CAPT

88
Q

How many Containment Floor and Equipment Sumps(CF&E) are there, and how many pumps are associated with each sump?

A
  1. There are two Containment Floor and Equipment Sumps in each Reactor Building
  2. There are two pumps for each sump
89
Q

What is the affect on the Containment Floor and Equipment Sump Pumps if the discharge Containment Isolation Valves close or lose power?

A

The sump pumps will automatically trip

90
Q

What will cause an automatic closure of the Containment Floor and Equipment Sump Containment Isolation Valves?

A
  1. EMF-53A(B) Trip 2 signal

2. Safety Injection signal

91
Q

What is the normal discharge path for the Containment Floor and Equipment Sumps?

A

The normal discharge path is to the Waste Evaporator Feed Tank, with an alternate to line to the Floor Drain Tank

92
Q

How is the liquid classified that enters the Containment Floor and Equipment Sumps?

A

All liquid that enters the sumps during normal operation is classified as unidentified

93
Q

What condition in the Containment Floor and Equipment Sumps will generate an OAC alarm?

A

If leakage reaches 1gpm then the OAC will generate an alarm

94
Q

What are the power supplies to the Containment Floor and Equipment Sump Pumps?

A

1A1, 1A2 - 1MXM/1MXN
1B1, 1B2 - 1MXM/1MXN
2A1, 2A2 - 2MXM/2MXN
2B1, 2B2 - 2MXM/2MXN

95
Q

How many Incore Instrumenation Room Sumps are there, and how many pumps associated with the sumps?

A
  1. There is one Incore Instrumentation Room Sump per unit

2. There is one pump per sump

96
Q

What are the power supplies to the Incore Instrumentation Room Sump Pumps?

A

1MXN/2MXN

97
Q

How many Residual Heat Removal/Containment Spray(ND/NS) sumps are there, and how many pumps are associated with the sumps?

A
  1. There is only one common ND/NS Sump

2. There are four pumps associated with the ND/NS Sump

98
Q

What are each of the ND/NS Sump Pumps rated for?

A

Each pump is sized to remove 50gpm leakage from each ND/NS pump room plus 40gpm of undefined leakage

99
Q

What is the normal discharge path for the ND/NS Sump?

A

The normal discharge is to the Waste Evaporator Feed Tank, with an alternate flow path to the Floor Drain Tank

100
Q

Where are the ND/NS Sump Pumps controlled from?

A
  1. MC-11

2. Local control switches

101
Q

What is the affect on the ND/NS Sump Pumps if the local control switch is in MANUAL?

A
  1. The associated pump will run unless a train related Safety Injection Signal is received on either unit
  2. If a Hi-Hi level is reached, the pump will start even if a Safety Injection signal is present
102
Q

What is the affect on the ND/NS Sump Pumps if the local control switch is in AUTO?

A
  1. The associated pump will start when High level is reaching in the sump unless a train related Safety Injection signal is receive on either unit
  2. If Hi-Hi level is reached the pump will start even if a Safety Injection signal is present
103
Q

What is the affect on the ND/NS Sump Pumps if the local control switch is STANDBY?

A

The associated pump will start when a Hi-Hi level is reached in the sump even if a Safety Injection signal is present

104
Q

What is the affect on the ND/NS Sump Pumps if the Control Room control switch is in ON?

A
  1. The associated pump will run and the LOCAL controls are overridden
  2. The pump will run if selected to ON even if a Safety Injection signal is received
105
Q

What is the affect on the ND/NS Sump Pumps if the Control Room control switch is in LOCAL?

A

The associated pump will be controlled by the LOCAL switch

106
Q

What does the RESET light on the ND/NS Sump Pumps Control Room control switch indicate?

A

When the light is out there is a Safety Injection signal present, and the ND/NS Sump Pumps will not automatically start until a Hi-Hi level is reached. After the Safety Injection signal is reset the RESET button must be depressed to return the sumps pumps operation to normal

107
Q

What are the level setpoints/actions for the ND/NS Pump Rooms Sump?

A
  1. Low - Stops pumps
  2. Hi - Starts pumps that are in AUTO
  3. Hi-Hi - Starts pumps in STBY local, Control Room annunciator and OAC alarm
  4. Emergency Hi - Local and Control Room annunciator
108
Q

What is the power supply to the ND/NS Sump Pumps?

A

1A, 1B - 1EMXA/1EMXJ

2A, 2B - 2EMXA/2EMXJ

109
Q

What is the precaution associated with a release based on Nuclear Service Water lineup?

A

Releases from the Auxiliary Building cannot be made while RN is aligned to the Standby Nuclear Service Water Pond

110
Q

What affect does a high radiation signal from 0EMF-49 have on the Liquid Waste System?

A

A high radiation signal from 0EMF-49 causes discharge valve 1WL-124 to automatically close

Catawba Nuclear Station (72 decks)

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