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NLO - Systems > LR - Liquid Radwaste > Flashcards

LR - Liquid Radwaste Flashcards

1
Q

What does Liquid Radwaste system do ?

A

Processes radioactive generated in plant:
-Processed liquid separated into recyclable water for reuse
-Concentrate is disposed of

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2
Q

What can LR system accommodate for ?

A

Accommodates secondary plant Condensate Demin. Resin chemical regeneration from Condense Polishers

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3
Q

What’re the 5 subsystem within the Liquid Radwaste system ?

A

-TDS subsystem collects radioactive liquid generated in plant
-Evaporator subsystem processes radioactive liquid from TDS Tanks
-Concentrate Monitor subsystem collects concentrates from evaporators
-Recycle Monitor subsystem collects recyclable water from the Evaporator
-Chemical Drain Collects radioactive water from Chem Labs and laundry & Decon Facility in Unit 1

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4
Q

Where does the Liquid Radwaste receive its Radioactive wastewater from ?

A

-Containment Sumps
-Radwaste Building Sump
-Aux. Building Sump
-Fuel Building Sump
-Decon & Laundry Facility sump(Unit1)
-Radio-Chem labs
-Solid Radwaste Resin Transfer/Dewatering Pump

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5
Q

What system will automatically divert to the Liquid Radwaste system on high radioactivity?

A

Aux. Steam Condensate Receiver Tank will auto divert to LR system

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6
Q

What systems do you manually have to divert to the Liquid Radwaste system on high radioactivity ?

A

-Condensate Polishing Demin. Sumps
-Blowdown Demin. Sumps
-Turbine Building Sump
-Chem. Waste Neutralizer Tank

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7
Q

What does TDS tank have a internal mixer ?

A

Provides mixing for tank contents to minimize deposition of solids

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8
Q

What’re the HI/LO level alarms setpoints??

A

HI-HI: 30,000 gallons
HI: 29,500 gallons
LO: 1,000gallons
LO-LO: 500 gallons

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9
Q

Where does the Liquid Radwaste TDS Tank vent to ?

A

Vents to Radwaste Building ventilation exhaust header

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10
Q

Where does the TDS Tank Overflow to ? What happens if all three TDS Tanks are overfilled

A

-TDS tanks overflow into one another
-If all three tanks are overflowing they’ll overflow into the Radwaste Building Sump

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11
Q

Where do the Liquid Radwaste Holdup Pumps discharge too ?

A

From the LRS RDS Hold up tanks to either LRS Evaporator or Radwaste Truck Bay

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12
Q

Where are the LRS TDS Holdup Pumps used for Recirculation?

A

-On nightly basis to prevent growth of micro-biologics in Tanks
-Prior to chemistry sampling & after chemical Additions
-Transfers water between LRS TDS Tanks

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13
Q

Where can the TDS Holdup Pumps take there suction from ?

A

All three LRS TDS Holdup Pumps can take suction from all three TDS Holdup Tank

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14
Q

What’re the power supplies to the TDS Holdup Pumps ?

A

They’re powered from 480VAC MCC

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15
Q

What automatic action will happen to Holdup Pumps when TDS Holdup Tank has a LO-LO level of 500gallons ?

A

LO-LO level in ANY TDS Holdup Tank will trip ALL Holdup Pumps & prevent all Holdup Pumps from being started

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16
Q

What is automatic functions does the ovation system provide for a LO-LO level in the TDS Holdup Tanks?

A

-Will ONLY trip the Holdup Pump that is aligned with the TDS Tank that has LO-LO level
-Other holdup pumps can start that are aligned to other TDS Tanks without LO-LO level

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17
Q

What are the Caustic Tank & Smaller Caustic Batch Tank used for ?

A

Caustic Tank- Used as storage tank for caustic used for PH adjustment of TDS Holdup Tank
Small Caustic Batch Tank- Used to provide the caustic to TDSHoldup Tank & prevents inadvertent drainage into the TDS HoldupTank

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18
Q

How is the Caustic Storage Tank filled ?

A

Tank is filled by Trailer Truck via fill connection on outside wall of Radwaste Building

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19
Q

When will the Caustic Tank fill valve automatically close ?

A

Will automatically close when Caustic Tank level reaches 40”

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20
Q

What is three way valve between the Caustic Tank & Small Caustic Batch Tank used for ?

A

-It’s used to gravity feed caustic from the Caustic Storage Tank to the Caustic Batch Tank
-Then the valve is realigned to supply Caustic from the Batch Tank to the TDS Tank
-Valve isn’t capable of Directly aligning Caustic Storage Tank to the TDS Tank

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21
Q

Where does the Caustic Storage Tank vent & overflow to ?

A

Vents & overflows to the neutralizing bed at 100ft at fill station

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22
Q

Why do the caustic piping have Heat Tracing & Caustic Tanks have heaters ?

A

Have heaters to prevent crystallization of NaOH

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23
Q

What is Anti-Foam used for ?

A

Anti-Foam agent minimizes bubbling & detergent foaming

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24
Q

Where is Anti Foam delivered to?

A

-LR Evaporator
-LRS TDS Holdup Tank(Never used)

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25
Q

How is the Anti-foam tank filled ?

A

Filled from portable tank via hand operated Fill pump & hose

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26
Q

Where is the Anti-Foam pump handswitch operated from ?

A

Provided panel in Radwaste Control Room

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27
Q

Where is Anti-Foam pump operated on the Ovation system ?

A

Will be controlled via Thin Client in Radwaste Control Room

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28
Q

What does the LR Evaporator do ?

A

-Concentrates & remove TDS
-Recover the water for reuse throughout plant

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29
Q

What does the Main Recycle Pump do? Where does it take suction from?

A

-Supplies 10,500gpm recirculation flow
-Takes suction from lower(liquid) portion Vapor Body & discharges to heating element

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30
Q

Where does the Heating Element get its heat source from ? What is it used for ?

A

Uses Aux. Steam to boil processed water from TDS Tanks for it to flash inside the Vapor Body

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31
Q

Where does the Aux. steam that gets condensed inside the heating element go ?

A

It goes to the Aux. Steam Condensate Receiver Tank

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32
Q

Where does Evaporator get its Feed from ?

A

Consists of feed from LRS TDS Holdup Tank

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33
Q

What kind of water goes through LP area of Vapor Body ?

A

Liquid waste enters & some flashes to steam & exits out the top

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34
Q

When liquid waste flashes to steam in the Vapor Body what does it pass through as it exits the top ?

A

-Steam passes through 3 reflux trays
-Passes through 3 mesh pads

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35
Q

What do the 3 reflux trays in Vapor Body do as steam passes through it ?

A

-Has spray nozzles that spray RMW that removes suspended dissolved solids from steam

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36
Q

What do the 3 mesh pads do inside the Vapor Body as the steam passes through it ? Where does removes moisture go ?

A

-Mesh pads remove contaminants & entrained moisture to prevent carryover
-Removed moisture falls down to Vapor Body for Recirc, while steam flows to condenser turns into reusable water

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37
Q

Where does the Evaporator Concentrate Pumps take there suction from ? Where do they discharge to ?

A

-Takes suction from Evap. Recycle line between Vapor Body & Main Recycle Pump
-Discharges concentrated liquid waste to Concentrate Monitor Tanks & density transmitter

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38
Q

What does the Surface Condenser do ? What cooling water is supplied to it ?

A

-Steam from Vapor Body is condensed by Surface Condenser
-Cooled by Nuclear Cooling Water

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39
Q

After vapor is condensed inside the Surface Condenser where does it fall to?

A

The condensed distillate falls into the reboiler

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40
Q

What does the Vent Cooler do ? What cooling water is sent through vent cooler ?

A

-Condenses any remaining Vapor coming from Surface Condenser to prevent water getting in Radwaste Building Exhaust
-Removes non-condensable gases via Radwaste Building Exhaust
-Nuclear Cooling Water

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41
Q

What is the reboiler used for ?

A

Improved distillate quality by removing volatile impurities by reheating it via Aux. Steam

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42
Q

What happens to the distillate as it falls through the column ?

A

Distillate is scrubbed as it falls through column by distillate vapor produced in Reboiler

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43
Q

Where does the degassed distillate collect ?

A

Collects in a seal pot at bottom of Reboiler

44
Q

Where does the Aux Steam drain to ?

A

Drains to the Heating Element

45
Q

Where do the Distillate Pumps take suction from ? Where does it discharge to ?

A

Take suction from Reboilers seal pot & discharges to either Distillate Cooler or back to Vapor Body based on reboiler level

46
Q

How many Distillate Pumps are in service ?

A

One pump is normally in service & other is in standby

47
Q

What does the Distillate Cooler do ?

A

-It cools distillate to 125F to prevent damage to Adsorption Bed & Mixed Bed Ion Exchanger resins

48
Q

What is the Distillate Cooler cooled by?

A

Cooled by nuclear cooling water

49
Q

After Distillate is cooled by Distillate Cooler where is it directed to ?

A

It’s directed to either Adsorption Bed & Mixed Bed Ion Exchanger for further processing or back to Vapor Body based on Conductivity

50
Q

Where does the Steam Condensate Pump take suction from? Where does it discharge to ?

A

Pumps condensed Aux. Steam from Heating Element to the Aux. Steam Condensate Receiver Tank

51
Q

What is the distillate level inside the Reboiler maintained at ?

A

Normally maintained at 65%-75%

52
Q

What supply valve shouldn’t be opened to prevent Reboiler tube damage ?

A

-Aux. steam supply valve shall not be opened until level indication is above 60% inside Reboiler

53
Q

What needs to be done to prevent reboiler tube damage the stripper steam valve ?

A

Aux. Steam is opened no more than 25%

54
Q

What’re the Adsorption Beds used for ?

A

Uses charcoal to contain total organic compound control

55
Q

What’re the Ion Exchangers downstream of the Adsorption Bed used for ??

A

Remove any trace ionic radioisotopes & chemical in solution through cation & anion exchange

56
Q

What happens to the exhausted resin & where is it sent to ?

A

It’s sliced to the Solid Radwaste system Spent Resin Storage Tanks for disposal

57
Q

How is the Ion Exchangers normally aligned ?

A

They’re aligned in series, but could be aligned in parallel

58
Q

What do the Recycle Monitor Tanks store ?

A

Accepts & stores processed liquid Radwaste from LRS Evaporator via Adsorption bed & Mixed Bed Ion Exchanger

59
Q

What is the Recycle Monitor takes provide water to ?

A

-SFP Makeup
-RCS Makeup
-Ion Exchanger Resin sluicing
-Condensate makeup(not used)

60
Q

Where do the Recycle Monitor Tank accept processed liquid Radwaste ?

A

Receives from LRS Evaporator via Adsorption Bed & Mixed Bed Ion Exchanger

61
Q

What’re the Recycle Monitor Tanks alarms ?

A

HI-HI: 30,000 gallon
HI: 29,500 gallon
LO:1,000 gallon
LO-LO: 500 gallon

62
Q

Why don’t the Recycle Monitor Tanks supply makeup water to RMWT & Condensate Storage Tank Makeup ?

A

There is tritium in the water and water is supposed to be clean water going to those tanks

63
Q

Where does the Recycle Monitor Tanks overflow to ?

A

They over flow to each other & if both tanks are full, then it’ll overflow into the Radwaste Sump

64
Q

What happens when Recycle Monitor Tanks hasn’t been sampled or isn’t acceptable for reuse ?

A

It it routed back to LRS TDS Holdup Tanks

65
Q

What is the Recycle Monitor Pump Powered from ?

A

It’s powered from 480VAC MCC

66
Q

What conditions will trip the Recycle Monitor Pumps ?

A

-LO-LO Recycle Monitor Tank from either tank
-HI-HI Pump Discharge

67
Q

Where is the Recycle Monitor Pump operated from?

A

Three position control switch provided in Radwaste Control Room

68
Q

What’re the Concentrator Monitoring subsystem used for?

A

-Provided holdup & monitoring processed from LRS Evaporator

69
Q

What does Concentrate Monitor Tanks store & collect ?

A

Store & collects radioactive waste from LRS Evaporator

70
Q

What is the normal line up for the Concentrate Monitor Tanks ?

A

-One tank is normally aligned to collect waste
-Other tank is isolated for sampling & waste disposal

71
Q

What does the Concentrate Monitor Tanks vent to ?

A

Radwaste Building Ventilation exhaust header

72
Q

What happens when Concentrate Monitor Tanks overflow ?

A

They overflow into each other & if both are filled will overflow into Radwaste Building Sump

73
Q

What automatic actuation will happen on a Concentrate Monitor Tank high level ?

A

It will trip the LRS Evaporator

74
Q

What’re the Concentrate Monitor Pumps used for ?

A

Used to transfer concentrated waste from Concentrate Monitor Tanks to the Solid Radwaste system

75
Q

Where are the Concentrate Monitor Pumps powered from ?

A

480VAC MCC (NH)

76
Q

Where does Concentrate Monitor Pump receives its seal water from ?

A

Receives seal water from RMW to prevent leakage of concentrate at the Pump seals

77
Q

Does Concentrate Monitor subsystems use Special Process Heat Tracing ?

A

Yes to maintain temperature where concentrate would solidify

78
Q

What conditions will automatically trip a running Concentrate Monitor Pump?

A

-LO-LO level in lines-up Concentrate Monitor Tank
-Low Pump suction pressure

79
Q

When starting a Concentrate Monitor Pump, what else is gonna receive a start signal ?

A

The pumps seal water supply valve will open when start signal is received

80
Q

Where is Concentrate Monitor Pump started from ?

A

-Three position hand switch provided on panel in Radwaste Control Room for each Concentrate Monitor Pump

81
Q

What does Chemical Drain collect?

A

Collects from detergent & chemical wastes from Chemical Lab sinks & Decon & Laundry Facility for storage & disposal

82
Q

What is the normal operation of the two Chemical Drain Tanks ?

A

-One tank is used for collection, while other tank is used for sampling & processing contents of other tank

83
Q

Where do the Chemical Drain Tanks vent to ?

A

They vent to the Aux. Building Ventilation exhaust header

84
Q

What happens when Chemical Drain Tanks overflow ?

A

They overflow into each other & if both get full it’ll overflow into Radwaste Building Sump

85
Q

When will the Unit 1 Laundry & Decon. Facility Sump pump start ? Once started where does it discharge to ?

A

-Sump pump starts when the Sump reaches a HI level setpoint
-Discharges to Chemical Drain Tank

86
Q

When the Unit 1 Laundry & Decon. Facility Sump Pump starts, why do you need to pay attention to the Chemical Drain Tank level ? When should the in service Chemical Drain Tank be swapped ?

A

-Must be aware when sump pump starts, monitor level of in service Chemical Drain Tank so it doesn’t overflow
-Swap Chemical Drain Tanks when in service one reaches 1000gallons

87
Q

Where do the Chemical Drain Pumps draw suction from? Where do they discharge to ?

A

Draws from Chemical Drain Tanks & discharges to LRS TDS Holdup Tank or Solid Radwaste system

88
Q

Where are the Chemical Drain Pumps powered from ?

A

Powered from 480VAC MCC(NH)

89
Q

When will Chemical Drain Pump automatically trip?

A

-LO-LO Level on in service Drain Tank
-HI-HI Pump Discharge Pressure

90
Q

What does the ovation equipment for distributed control of Liquid Radwaste system consist of ?

A

-Fanout Switches
-Control Cabinets
-Thin Clients

91
Q

What’re Fanout switches used for ?

A

-Local switched for control of Liquid Radwaste & Boric Acid Concentrator
-Serves as interface between local Ovation Controllers & main Root Switches for Ovation system

92
Q

What does a single Control Cabinet for Liquid Radwaste system consist of ?

A

-Drop 40/90
-Two full branches of I/O Modules
-One Remote Node Controller Cabinet with more I/O Modules

93
Q

How will a loss of the Liquid Radwaste system impact the plant ?

A

If it’s unavailable,exceeded capacity, or is lost then TDS Holdup Tanks water will be transported to other unit for processing

94
Q

How do LR system interface with NG?

A

NG provides power to LRS Evaporator MCC

95
Q

How does LR system interface with NH system ?

A

NH provides power to pumps & control panels

96
Q

How does LR system interface with NK?

A

NK provides control power to Radwaste Control Room Panels

97
Q

How does LR system interface with Solid Radwaste system ?

A

-LR wastes are sent to SR system for packaging & shipment offsite
-LR Recycle Monitor Tank can also supply suction for Resin Transfer Dewatering Pump
-After spent resin transfer, SR system sluice water can be sent to TDS Holdup Tank

98
Q

How does LR system interface with Condensate Transfer & Storage ?

A

Recycle Monitor Tank can send reusable water to CST Tank (Not Normally Used )

99
Q

How does LR system interface with SFP ?

A

Recycle Monitor Tanks send water to SFP for makeup water

100
Q

How does LR system interface with Radioactive Waste Drains ?

A

-LR equip. Drains & leakage collects in Radwaste Building Sump
-LR receives waste from all building that could potentially have radioactive particles

101
Q

How does LR system interface with Radwaste Building HVAC(HR) ?

A

-TDS Tanks, Concentrate Monitor Tanks, & Evaporator vent to HR
-HR also provides cooling for LR components

102
Q

How does LR system interface with Aux. Building HVAC (HA)?

A

-LR Chemical Drain Tank vent to Aux Building Exhaust Header

103
Q

How does LR system interface with Aux. Steam(AS) system ?

A

-AS provides steam to LRS Evaporator
-Condensate from LR evaporator is returned to AS Condensate Receiver Tank
- LR System can receive condensate from AS Condensate Receiver Tank

104
Q

How does LR interface with Oily Waste & Non-Radioactive Waste ?

A

Turbine Building Sump Pump discharge can be aligned to TDS HoldupTank

105
Q

How does the LR system interface with Chemical Waste(CM) system?

A

-Chemical Waste Neutralizer Tanks aligned to TDS Tanks
-Radiochemistry Lab drainage aligned to TDS Tanks

106
Q

How does LR system interface with Service Gases ?

A

LP nitrogen is supplied to Evaporator Vapor Body for batch discharge

NLO - Systems (70 decks)

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