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NLO Systems NLIT exam 3 > LR- Liquid Radwaste > Flashcards

LR- Liquid Radwaste Flashcards

1
Q

What is the purpose of the Liquid Radwaste system?

A

Collects, processes, monitors, and recycles or disposes of liquid radwaste generated in the plant

Can also accommodate secondary plant demin resin chemical regenerates from the condensate demineralizers

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2
Q

What normally processes liquid radwaste of borated and tritiated reactor coolant quality water?

A

Boric Acid Concentrator

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3
Q

After the liquids are processed through the LR system, where are they sent to next?

A

To either the solid radwaste and radioactive filter handling system (SR/RF) for packaging and off-site shipment, recycled for eventual reuse in the plant or retained for further processing.

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4
Q

Are there any off-site release points from the LR system?

A

No

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5
Q

What sources of liquid are received by the LR system normally and abnormally?

A

normal:

Containment, Radwaste, Radwaste building, Auxiliary Building, Fuel building

Decontamination and laundry facility (Unit 1)

Radiochemistry labs (CM)

Solid Radwaste resin transfer/dewatering pump

abnormal:

Condensate polishing and blowdown demineralizer regenerant wasts

turbine building sumps

Aux Steam condensate receiver tank

Chem. Waste neutralizer tank

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6
Q

What provides power to the LR evaporator MCC? What powers various LR system pump motors, control panels and heat tracing?

A

NG

NH

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7
Q

What provides cooling to the Evaporator? Where is the LR Evaporator located?

A

Nuclear Cooling

120’ RW building

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8
Q

What are the five sub-systems of the LR system?

A

TDS

Evaporator

Concentrate Monitor

Recycle Monitor

Chemical Drain

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9
Q

What is the purpose of the LR Holdup tanks?

A

To allow collection of radioactive liquid waste

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10
Q

What is the capacity of the LR Holdup tanks? What are the high and low level setpoints? What protects the inside of the tank from deposition of solids?

A

Capacity of 31,400 gallons

Hi: 29,500 gallons
Lo: 1000 gallons

internal mixing header for good mixing and sparging of internal surfaces

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11
Q

What is the Hi-Hi level setpoint for the LR Holdup tanks?

A

30,000 gallons

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12
Q

What happens if any of the LR Holdup tanks lowers to 500 gallons (lo-lo level)?

A

All holdup pumps will trip and the evaporator feed valve, LV-202, will close

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13
Q

Where do the LR Holdup tanks vent to? Where are they located?

A

Radwaste Building ventilation exhaust header

south of radwaste building surrounded by concrete walls

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14
Q

Where is the LR Holdup tank overflow directed to?

A

They will overflow to each other prior to overflowing to the Radwaste building sump

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15
Q

What is the purpose of the LR Holdup Pumps? Where are they powered from? Where are they located?

A

To transfer waste from the TDS holdup tanks to the LR evaporator

NH

100’ radwaste building

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16
Q

Where are the controls for the LR Holdup Pumps? What trips these pumps?

A

Radwaste Control room

lo-lo level in any TDS holdup tank will trip all pumps

also have electrical protection

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17
Q

What is the purpose of the LR Caustic Tank? How is level measured? How is this tank filled and where does it over flow to?

A

Serves as a storage tank for the caustic (50 weight percent NaOH) used in the LR system

0-47” in a sight glass

truck fill connection on the south exterior wall of radwaste building

neutralizing bed on the 100’

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18
Q

What is the purpose of the LR caustic batch tank? capacity? What protections does this tank have?

A

Gravity filled from the Caustic storage tank, used to provide caustic to the TDS Holdup Tanks for pH adjustments

25 gallons

heat trace and 25kw heater

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19
Q

How does the Caustic get added to the LR TDS Holdup Tanks? Where are the caustic and caustic batch tanks located?

A

Via gravity flow from the batch tank

120’ radwaste building

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20
Q

What is the purpose of the LR Anti-Foaming Tank? What does it minimize?

A

Stores anti-foaming suppressants for addition to collected wastes, which contain detergents

bubbling and detergent foaming

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21
Q

What is the purpose of the LR Anti-Foam Metering Pump?

A

Delivers Anti-foaming storage tank contents to the LR evaporator package

can also align to the TDS tanks, but it is pointless because the anti-foam floats to the top and will never reach the evaporator

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22
Q

What is the capacity of the LR Anti-Foam Storage tank? How is this tank filled? Where are the anti-foam tank and pump located?

A

110 gallons

hand pumped from a tank and a hose into the storage tank

chemical addition room on the 120’ radwaste building

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23
Q

What kind of pump is the LR Anti-foam Metering pump and when will it trip?

A

54 gph positive displacement pump

Automatically trips when the anti-foam tank level decreases to 13” (44.7 gallons)

As long as the level remains low, the pump will not start

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24
Q

What is the purpose of the evaporator in the LR system?

A

Removes water from and increases the concentration of total solids in liquid waste, processed from the TDS tanks.

Concentrated liquid may not be reused like in the BAC due to undesirable contaminants

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25
Q

What is the purpose of the Vapor Body in the LR evaporator package? How are suspended and dissolved solids removed from the vapor prior to leaving the vapor body?

A

Serves as the primary separation chamber to release vapor from boiling liquid

Contains reflux trays and mesh pad moisture separators near the top to prevent carryover of entrained liquid, suspended solids and undesirable contaminants

reflux trays have fine mist spray nozzles that remove solids from the vapor and mesh pads remove the entrained moisture and contaminants

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26
Q

What is the purpose of the Surface Condenser in the LR evaporator package? Where are the non-condensable gases vent to?

A

Uses NC flowing through the condenser tubes to condense vaporized liquid waste that enters the shell side

radwaste building exhaust via the vent cooler

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27
Q

What is the purpose of the Reboiler in the LR evaporator package? How does it work?

A

Improves distillate quality by removing volatile impurities via reheating it

a gas stripping column with perforated plates and a reboiler scrub the distillate as it falls through distillate vaper produced inside the column. distillate gathers in a Seal Pot at the bottom

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28
Q

What is the heat source for the Reboiler in the LR evaporator package?

A

Auxiliary Steam

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29
Q

What is the purpose of the Distillate cooler in the LR evaporator package?

A

To cool the evaporator distillate to a temperature below the design temperature of the LR system Adsorption Bed and Mixed-Bed Ion Exchanger resins

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30
Q

Concerning the LR evaporator package, to what temperature is the Distillate lowered to in the cooler? Why do we cool it? Where does the subcooled distillate get sent to?

A

125F

To protect the Ion Exchanger resin

directly to the adsorption bed and mixed bed ion exchangers

31
Q

How does the Distillate get from the Reboiler to the Distillate Cooler in the LR evaporator package?

A

Distillate pumps at 40 gpm take suction on the Seal Pot of the Reboiler.

One in service, the other secured

32
Q

What is the purpose of the Main Recycle Pump in the LR evaporator package and what is its rated capacity?

A

Takes suction on the lower portion of the Vapor Body and discharges to the heating element

Rated at 10,500 gpm

33
Q

What is the purpose of the Evaporator Concentrate Pumps in the LR evaporator package?

A

Take suction on the recycle line, between the Vapor Body and the Main Recycle Pump, and discharge the concentrated liquid radwaste to the Concentrate Monitor Tanks and the Density Transmitter at a rated capacity of 50 gpm

34
Q

What is contained in the LR Adsorption Bed Ion Exchanger? Purpose?

A

Charcoal (or carbon)

Total Organic Compound (TOC) control

35
Q

What is contained in the two LR Mixed-Bed Ion Exchangers?

A

Cation and anion resin

36
Q

What is done with the LR resin when it is exhausted? How is replacement resin added? Where are the LR ion exchangers located?

A

Sluiced to the SR/SF system spent resin storage tanks for disposal

replacement resin added manually

120’ RW building

37
Q

How are the LR Ion Exchangers normally operated?

A

In series

38
Q

What is the purpose of the Recycle Monitor Sub-system?

A

Accepts and stores processed liquid radwaste from the Mixed Bed Ion Exchangers.

The water is analyzed prior to reuse for RCS makeup, condensate makeup, ion exchange resin sluicing, or spent fuel pool makeup

39
Q

What is the capacity of the Recycle Monitor Tanks? Level Alarm setpoints?

A

Capacity 31,400 gallons

Hi-hi: 30,000 gallons
Hi: 29,500 gallons
Lo: 1000 gallons

40
Q

Where is the Recycle Monitor Tank overflow directed to? Where is it located?

A

They will overflow to each other prior to overflowing to the Radwaste sump

100’ south of RW building surrounded by concrete

41
Q

What is the purpose of the Recycle Monitor Pump?

A

Delivers water at 150 gpm from the Recycle Monitor Tanks to the Reactor Makeup Water Tank, Condensate Storage Tank, Spent Resin Tanks or Spent Fuel Pool, if the water is acceptable for use.

If not, it is routed to the LR Holdup Tanks for reprocessing

42
Q

What would cause the Recycle Monitor Pump to trip? What system powers this pump and where is it located?

A

Hi-hi pump discharge pressure
Lo-lo level (Tank A or B)
Electrical protection

NH

100’ RW building

43
Q

What is the purpose of the Concentrate Monitor Sub-system?

A

Provides from holdup and monitoring of concentrates processed from the LRS evaporator.

From there, concentrates are pumped to the SR/SF system for processing and proper packaging for disposal

44
Q

Under normal conditions, what is the status of the Concentrate Monitor Tanks in the LR system?

A

One is aligned to receive waste and the other is isolated for sampling and waste disposal

45
Q

What is the capacity of the Concentrate Monitor Tanks and where do they vent to? Where are they located?

A

5100 gallons

Vent to the Radwaste building ventilation exhaust header

100’ RW building

46
Q

When the Concentrate Monitor Tank Pumps are started, a signal is sent out to cause what to occur?

A

HV-121 (HV-120) open to ensure that pump shaft seal water is available to the pump

47
Q

What would cause the Concentrate Monitor Tank Pumps to trip? What system powers these pumps and where are they located?

A

Lo-lo level in the Concentrate Monitor Tank
Low pump suction pressure
Electrical protection
If tank cross tie valve is open and the other tank has a lo-lo level

NH

100’ RW building

48
Q

What sub-system collects detergent and chemical wastes from the chemical labs and decontamination and laundry facility in the LR system?

A

Chemical drain sub-system

49
Q

What is the capacity of the Chemical Drain Tanks and where do they vent to? Overflow to?

A

1422 gallons

Vent to the Aux building ventilation exhaust header

each other with a connection connected to a floor drain

50
Q

What would cause the Chemical Drain Pumps to trip?

A

Power is lost to the associated pressure switches

Lo-lo level exists in associated tank

Lo-lo level exists in the other tank and the
pump suction cross tie valve is not fully closed (will not start if it is not running)

Hi-hi pump discharge pressure

Electrical protection

51
Q

What two methods are provided for processing miscellaneous high TDS wastes if the LR evaporator is non-operational?

A

Direct solidification

Ion exchange

52
Q

How is the LR system affected by a loss of NC?

A

Cooling lost to the evaporator which will cause temperature on inlet to the adsorption bed to increase, sounding an alarm that prompts operator to secure the evaporator.

If flow continues, resin damage will occur

53
Q

What would be a symptom of resin retention screen failure in the LR ion exchangers?

A

Low system flow
High strainer pressure drop
Higher than normal radiation levels in the valve gallery

54
Q

How is the LR evaporator affected by a loss of Instrument Air?

A

It must be shutdown due to loss of pneumatic devices

55
Q

What system supplies water for mechanical seals in the LR system?

A

Reactor Makeup Water

56
Q

How does the NK system interface with LR?

A

control power to the radwaste control room panels

57
Q

How does the liquid radwaste system interface with the SR/RF system?

A

LR sends its wastes to the SR/RF system for packing, shipment and off site disposal

Recycle monitor tanks can supply a suction for resin transfer dewatering pumps

after spent resin transfer, the SR/RF system will sluice water can be sent to the high TDS holdup tank

58
Q

How does LR interface with CT and PC?

A

recycle monitor tanks can potentially send make up water to the CST or spent fuel pool

59
Q

How does the LR system interface with HR?

A

receives vents from low and high TDS tanks, concentrate monitor tanks and evaporator package

also ventilates and cools LR system components

60
Q

How does the LR system interface with the aux steam system (AS)?

A

The AS condensate receiver tank provides steam for and receives the condensate from the LR evaporator

61
Q

What is the purpose of Nitrogen in the LR system?

A

supplied to the evaporator vapor body for batch discharge

62
Q

How does LR interface with IA?

A

provides pressurized air for the LR system caustic and acid fill stations

provides air to pneumatic devices on the LR evaporator

63
Q

What in the LR system is cooled by nuclear cooling water?

A

LR evaporator surface condenser

distillate cooler

vent cooler

64
Q

What are some indications of foaming and anti-foam is needed in the LR system?

A

high evaporator mesh pad differential pressure

high evaporator distillate conductivity

unusual level swings in the evaporator vapor body

65
Q

What is the purpose of the heating element in the LR evaporator package? What flow is tube side and what is shell side?

A

to boil the new, and recycle flow, from the TDS hold up pumps and what liquid is in the vapor body

aux. steam is shell side, vapor body process water is tube side

66
Q

What is maintained in the LR evaporator package heating element? Where does this condensed aux. steam go down stream of the heating coil?

A

a level of condensed aux. steam

AS condensate receiver tank through the LR evap steam condensate pump

67
Q

What is the purpose of the vent cooler in the LR evaporator package

A

spiral tube HX allows non-condensable gases to flow to the RW exhaust ducting and allows the condensed steam (distillate) to gravity drain to the reboiler to prevent water in the RW HVAC

68
Q

What is in place to prevent reboiler tube damage in the LR evaporator package?

A

the aux. steam supply valve to the reboiler is inoperable until the distillate level in the reboiler is at least 60%

aux steam supply valve opens to only 25%

69
Q

What is the purpose of the steam condensate pump in the LR evaporator package?

A

40 gpm pump takes suction on the shell side of the heating element and sends the condensate to the AS steam condensate receiver tank

70
Q

While the LR evaporator is in operation, what must be done prior to sending the Aux. steam condensate receiver tank contents back to the main condenser or cross-tie header?

A

divert tank contents to the TDS holdup tanks until Chemistry gets a sample

71
Q

What system powers the LR chemical drain pumps? Where do they send the contents of the Chemical drain tanks to? Where are the pumps located?

A

NH

TDS holdup tanks or solidification package

40’ aux. building

72
Q

How is the plant affected if LR is not available?

A

TDS holdup tank contents are transported to another unit for processing

73
Q

What purposes does Reactor make up water provide in the LR system?

A

flush water to the evaporator

flush concentrate monitor lines

seal water to concentrate pumps and main recycle pump

NLO Systems NLIT exam 3 (21 decks)

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