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LR- Liquid Radwaste Flashcards

1
Q

[LR]

Liquid Radwaste purpose?

A

Collects, monitors, and recycles/disposes of liquid radwaste

Can process secondary plant demin resin chemical regenerates from [CD] demineralizers

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2
Q

[LS]

What processes borated and tritiated RCS quality water?

A

Boric Acid Concentrator

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3
Q

[LS]

After [LS] where are liquids sent to next?

A

[SR] and [RF] for packaging and off-site shipment,
-recycled for plant reuse
-or retained for further processing.

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4
Q

[LS]

Are there off-site release points for [LR]?

A

No

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5
Q

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

A

Normal:
-CNTMT, RW, AB, FB
-Decon & laundry facility (Unit 1)
-Radiochemistry labs (CM)
-Solid Radwaste resin transfer/dewatering pump

Abnormal:
-Condensate polishing and blowdown demineralizer regenerant waste
-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?

A

[NC] Nuclear Cooling

Located: RW 120’ RW

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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

[LR]

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

A

31,400 gallons

Hi: 29,500 gallons
Lo: 1000 gallons

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11
Q

[LR]

Hi-Hi level setpoint for the [LR] Holdup tanks?

A

30,000 gallons

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12
Q

[LR]

What happens if [LR] Holdup tanks lower to lo-lo level (500 gallons)

A

Holdup pumps trip
and evaporator feed valve closes (LV-202)

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13
Q

Where do the [LR] Holdup tanks vent to?

A

RW Ventilation

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14
Q

The [LR] Holdup tank overflow directed to?

A

The other 2 H/U Tanks, before RW sump

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15
Q

[LR] Holdup Pumps purpose?
Powered from?

A

Transfer waste from TDS holdup tanks to [LR] Evaporator

NH

RW 100’

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16
Q

[LR] Holdup Pumps controls located?
What will trip these pumps?

A

RW Control Room

-lo-lo level in any TDS holdup tank (trips all pumps)

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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?

A

gravity fed from batch tank

RW 120’

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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
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?
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
26
What is the purpose of the Surface Condenser in the LR evaporator package? Where are the non-condensable gases vent to?
NC flowing through the condenser tubes to condense vaporized liquid waste that enters the shell side radwaste building exhaust via the vent cooler
27
What is the purpose of the Reboiler in the LR evaporator package? How does it work?
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
28
What is the heat source for the Reboiler in the LR evaporator package?
Auxiliary Steam
29
What is the purpose of the Distillate cooler in the LR evaporator package?
To cool the evaporator distillate to a temperature below the design temperature of the LR system Adsorption Bed and Mixed-Bed Ion Exchanger resins
30
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?
125F To protect the Ion Exchanger resin directly to the adsorption bed and mixed bed ion exchangers
31
How does the Distillate get from the Reboiler to the Distillate Cooler in the LR evaporator package?
Distillate pumps at 40 gpm take suction on the Seal Pot of the Reboiler. One in service, the other secured
32
What is the purpose of the Main Recycle Pump in the LR evaporator package and what is its rated capacity?
Takes suction on the lower portion of the Vapor Body and discharges to the heating element Rated at 10,500 gpm
33
What is the purpose of the Evaporator Concentrate Pumps in the LR evaporator package?
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
What is contained in the LR Adsorption Bed Ion Exchanger? Purpose?
Charcoal (or carbon) Total Organic Compound (TOC) control
35
What is contained in the two LR Mixed-Bed Ion Exchangers?
Cation and anion resin
36
What is done with the LR resin when it is exhausted? How is replacement resin added? Where are the LR ion exchangers located?
Sluiced to the SR/SF system spent resin storage tanks for disposal replacement resin added manually 120' RW building
37
How are the LR Ion Exchangers normally operated?
In series
38
What is the purpose of the Recycle Monitor Sub-system?
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
What is the capacity of the Recycle Monitor Tanks? Level Alarm setpoints?
Capacity 31,400 gallons Hi-hi: 30,000 gallons Hi: 29,500 gallons Lo: 1000 gallons
40
Where is the Recycle Monitor Tank overflow directed to? Where is it located?
They will overflow to each other prior to overflowing to the Radwaste sump 100' south of RW building surrounded by concrete
41
What is the purpose of the Recycle Monitor Pump?
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
What would cause the Recycle Monitor Pump to trip? What system powers this pump and where is it located?
Hi-hi pump discharge pressure Lo-lo level (Tank A or B) Electrical protection NH 100' RW building
43
What is the purpose of the Concentrate Monitor Sub-system?
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
Under normal conditions, what is the status of the Concentrate Monitor Tanks in the LR system?
One is aligned to receive waste and the other is isolated for sampling and waste disposal
45
What is the capacity of the Concentrate Monitor Tanks and where do they vent to? Where are they located?
5100 gallons Vent to the Radwaste building ventilation exhaust header 100' RW building
46
When the Concentrate Monitor Tank Pumps are started, a signal is sent out to cause what to occur?
HV-121 (HV-120) open to ensure that pump shaft seal water is available to the pump
47
What would cause the Concentrate Monitor Tank Pumps to trip? What system powers these pumps and where are they located?
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
What sub-system collects detergent and chemical wastes from the chemical labs and decontamination and laundry facility in the LR system?
Chemical drain sub-system
49
What is the capacity of the Chemical Drain Tanks and where do they vent to? Overflow to?
1422 gallons Vent to the Aux building ventilation exhaust header each other with a connection connected to a floor drain
50
What would cause the Chemical Drain Pumps to trip?
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
What two methods are provided for processing miscellaneous high TDS wastes if the LR evaporator is non-operational?
Direct solidification | Ion exchange
52
How is the LR system affected by a loss of NC?
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
What would be a symptom of resin retention screen failure in the LR ion exchangers?
Low system flow High strainer pressure drop Higher than normal radiation levels in the valve gallery
54
How is the LR evaporator affected by a loss of Instrument Air?
It must be shutdown due to loss of pneumatic devices
55
What system supplies water for mechanical seals in the LR system?
Reactor Makeup Water
56
How does the NK system interface with LR?
control power to the radwaste control room panels
57
How does the liquid radwaste system interface with the SR/RF system?
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
How does LR interface with CT and PC?
recycle monitor tanks can potentially send make up water to the CST or spent fuel pool
59
How does the LR system interface with HR?
receives vents from low and high TDS tanks, concentrate monitor tanks and evaporator package also ventilates and cools LR system components
60
How does the LR system interface with the aux steam system (AS)?
The AS condensate receiver tank provides steam for and receives the condensate from the LR evaporator
61
What is the purpose of Nitrogen in the LR system?
supplied to the evaporator vapor body for batch discharge
62
How does LR interface with IA?
provides pressurized air for the LR system caustic and acid fill stations provides air to pneumatic devices on the LR evaporator
63
What in the LR system is cooled by nuclear cooling water?
LR evaporator surface condenser distillate cooler vent cooler
64
What are some indications of foaming and anti-foam is needed in the LR system?
high evaporator mesh pad differential pressure high evaporator distillate conductivity unusual level swings in the evaporator vapor body
65
What is the purpose of the heating element in the LR evaporator package? What flow is tube side and what is shell side?
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
What is maintained in the LR evaporator package heating element? Where does this condensed aux. steam go down stream of the heating coil?
a level of condensed aux. steam AS condensate receiver tank through the LR evap steam condensate pump
67
What is the purpose of the vent cooler in the LR evaporator package
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
What is in place to prevent reboiler tube damage in the LR evaporator package?
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
What is the purpose of the steam condensate pump in the LR evaporator package?
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
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?
divert tank contents to the TDS holdup tanks until Chemistry gets a sample
71
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?
NH TDS holdup tanks or solidification package 40' aux. building
72
How is the plant affected if LR is not available?
TDS holdup tank contents are transported to another unit for processing
73
What purposes does Reactor make up water provide in the LR system?
flush water to the evaporator flush concentrate monitor lines seal water to concentrate pumps and main recycle pump

NLO - Systems (70 decks)

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