LR- Liquid Radwaste Flashcards
What is the purpose of the Liquid Radwaste system?
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
What normally processes liquid radwaste of borated and tritiated reactor coolant quality water?
Boric Acid Concentrator
After the liquids are processed through the LR system, where are they sent to next?
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.
Are there any off-site release points from the LR system?
No
What sources of liquid are received by the LR system normally and abnormally?
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
What provides power to the LR evaporator MCC? What powers various LR system pump motors, control panels and heat tracing?
NG
NH
What provides cooling to the Evaporator? Where is the LR Evaporator located?
Nuclear Cooling
120’ RW building
What are the five sub-systems of the LR system?
TDS
Evaporator
Concentrate Monitor
Recycle Monitor
Chemical Drain
What is the purpose of the LR Holdup tanks?
To allow collection of radioactive liquid waste
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?
Capacity of 31,400 gallons
Hi: 29,500 gallons
Lo: 1000 gallons
internal mixing header for good mixing and sparging of internal surfaces
What is the Hi-Hi level setpoint for the LR Holdup tanks?
30,000 gallons
What happens if any of the LR Holdup tanks lowers to 500 gallons (lo-lo level)?
All holdup pumps will trip and the evaporator feed valve, LV-202, will close
(ovation now only trips the pump associated with the lo-lo tank)
Where do the LR Holdup tanks vent to? Where are they located?
Radwaste Building ventilation exhaust header
south of radwaste building surrounded by concrete walls
Where is the LR Holdup tank overflow directed to?
They will overflow to each other prior to overflowing to the Radwaste building sump
What is the purpose of the LR Holdup Pumps? Where are they powered from? Where are they located?
To transfer waste from the TDS holdup tanks to the LR evaporator
NH
100’ radwaste building
Where are the controls for the LR Holdup Pumps? What trips these pumps?
Radwaste Control room
lo-lo level in any TDS holdup tank will trip all pumps
also have electrical protection
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?
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’
What is the purpose of the LR caustic batch tank? capacity? What protections does this tank have?
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
How does the Caustic get added to the LR TDS Holdup Tanks? Where are the caustic and caustic batch tanks located?
Via gravity flow from the batch tank
120’ radwaste building
What is the purpose of the LR Anti-Foaming Tank? What does it minimize?
Stores anti-foaming suppressants for addition to collected wastes, which contain detergents
bubbling and detergent foaming
What is the purpose of the LR Anti-Foam Metering Pump?
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
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?
110 gallons
hand pumped from a tank and a hose into the storage tank
chemical addition room on the 120’ radwaste building
What kind of pump is the LR Anti-foam Metering pump and when will it trip?
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
What is the purpose of the evaporator in the LR system?
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
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
What is the purpose of the Surface Condenser in the LR evaporator package? Where are the non-condensable gases vent to?
Uses NC flowing through the condenser tubes to condense vaporized liquid waste that enters the shell side
radwaste building exhaust via the vent cooler
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
What is the heat source for the Reboiler in the LR evaporator package?
Auxiliary Steam
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
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
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
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
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
What is contained in the LR Adsorption Bed Ion Exchanger? Purpose?
Charcoal (or carbon)
Total Organic Compound (TOC) control
What is contained in the two LR Mixed-Bed Ion Exchangers?
Cation and anion resin
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
How are the LR Ion Exchangers normally operated?
In series
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
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
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
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
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
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
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
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
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
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
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
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
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
What two methods are provided for processing miscellaneous high TDS wastes if the LR evaporator is non-operational?
Direct solidification
Ion exchange
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
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
How is the LR evaporator affected by a loss of Instrument Air?
It must be shutdown due to loss of pneumatic devices
What system supplies water for mechanical seals in the LR system?
Reactor Makeup Water
How does the NK system interface with LR?
control power to the radwaste control room panels
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
How does LR interface with CT and PC?
recycle monitor tanks can potentially send make up water to the CST or spent fuel pool
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
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
What is the purpose of Nitrogen in the LR system?
supplied to the evaporator vapor body for batch discharge
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
What in the LR system is cooled by nuclear cooling water?
LR evaporator surface condenser
distillate cooler
vent cooler
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
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
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
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
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%
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
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
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
How is the plant affected if LR is not available?
TDS holdup tank contents are transported to another unit for processing
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
