WC- Normal Chilled Water Flashcards
What is the purpose of the WC system?
To provide chilled water at ~45F to the cooling coils of the Normal Heating, Ventilation and Air Conditioning systems in the Containment, Control, Aux, and Radwaste buildings
Chilled water is also sent to Non-nuclear process sampling coolers, polishing demineralizer sample coolers, blowdown demineralizer sample coolers, and main generator collector housing cooler
What is the interlock associated with the Containment ACUs?
Closes an isolation valve, stopping chilled water flow when the fan is not running
What system provides cooling to each chiller package? What is the tonnage of each chiller package?
Nuclear Cooling Water (low flow of NC will cause the chiller to trip)
A, B, C are 800 tons
E02 is 213 tons
What is the power supply to ‘A’ Normal Chiller?
PB
What system is used as a makeup source of water for WC?
DW
What powers the WC circulation pumps? What is special about the WCN-E01A circulation pump power supply?
NH
SIAS load shed MCC
What system powers ‘B’, ‘C’, and ‘E02’ chillers?
NB
What is the interlock between Circulating water pumps and the respective WC chiller nuclear cooling water outlet valve? What system can I use if NC is unavailable for cooling?
When the pump starts and stops the valve opens and closes
EW
What are the three WC circ pumps associated with the large chillers rated for?
1200 gpm @ 100ft
What is the E02 circulating pump rated for?
320 gpm @ 100 ft
Why does the WC chiller compressor start after a time delay?
To allow oil pressure, chilled water and cooling water flows to establish
Where are the WC circ pumps located? Were Is the surge tank located?
both on the roof of the Aux Building
What is the normal level of the WC Expansion Tank? What is the capacity?
36”
270 gallons
At what pressure is Nitrogen maintained in the WC Expansion Tank?
15 psig
What are the high and low pressure setpoints for the WC Expansion Tank? What are the low and high level set points?
High – 45 psig
Low – 5 psig
Low-12”
High-72”
When will the Expansion tank relief lift? Vacuum breaker?
60 psig
2”HG
When would the makeup valve open and close for the Expansion Tank? What is the make up source?
Opens at 24” and closes at 48”
DW
Where is the WC Chemical Addition Tank located? Capacity?
Roof of the Aux Building, north of chiller ‘A’
11 gallons
What are the precautions associated with adding chemicals to WC?
Water drained form the system must be disposed of properly
Do not add more than one chemical at a time
Operator will wear apron, face shield, and gloves when draining, venting, pumping chemicals, or removing the tank’s cap
Temporary eyewash station will need to be obtained and placed near the Chemical Addition tank for safety purposes
In the WC system, What does PH provide power to?
motor operated containment isolation valves
How does the WC system interface with the NN system?
power for instrument and controls
How does the WC system interface with the CM (chemical waste management) system?
receives all water drained/vented from the WC system to the chemical waste neutralizing tanks
Why would the WC circulating water pump be started without the chiller package operating?
during low heat loads and only one chiller is necessary.
running only one pump provides marginal flow through the system.
(this bypassed flow by the second pump will raise the temperature of the chilled water flow slightly but increases the amount of heat load the single chiller can carry stably)
Normally, the WC chemical addition tank is isolated. What is its status when cold weather protection is in effect?
flow will be aligned to the tank to prevent freeze damage