Sheildcooling

Card Set Information

Author:
skrappie1
ID:
110899
Filename:
Sheildcooling
Updated:
2012-01-10 10:50:39
Tags:
shieldcooling advanced systems
Folders:

Description:
shieldcooling
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user skrappie1 on FreezingBlue Flashcards. What would you like to do?


  1. Shield cooling pump low discharge pressure alarm EK-1302
    35 psig
  2. Minimum shield cooling system components for design basis
    • 1 pump
    • 1 HX
    • 1 set of cooling coils
  3. CV-0932/CV-0934, shield cooling coil inlet supply valves
    • Air operated, fail open diaphram valves
    • 2 position open/close keyswitch on C-08/C-03
    • Interlocked with low flow alarm
    • -when valve is closed, low flow alarm is bypassed
  4. P-77A/B shield cooling pump controls
    • 3 position switch
    • Close
    • -starts pump
    • Trip
    • Pull to standby
    • -pump auto starts on low discharge pressure of 35 psig
  5. Purpose of the shield cooling system?
    • Designed to maintain structural concrete temperature less than 165oF to prevent concrete weakening due to loss of moisture
    • Required to be in operation whenever PCS temperature is >165oF
  6. CV-0927, shield cooling surge tank makeup valve
    • Opens at 23% (34")
    • Closes at 86% (74")
    • Makeup from T-81
    • -alternate from T-2, may need to throttle MV-CD172 T-2 HX inlet to create sufficient head
    • We do not use, it leaks, CV-0939 is caution tagged closed
  7. CV-0939 shield cooling surge tank isolation
    • Closes on CHP/CHR
    • Controlled from open/close switch on C-13
    • Caution tagged closed
  8. Minimum/maximum shield cooling flow
    • Minimum
    • -wall
    • --30 gpm per coil
    • -floor coil
    • --20 gpm
    • Maximum
    • -154 gmp
    • --limited by the heat exchanger
  9. What is required if shield cooling return temperature > 165oF and shield cooling high temperature alarm will not clear?
    Plant S/D
  10. T-62, shield cooling surge tank
    • 1,700 gallons
    • -capacity based on total change in system water volume as a result of maximum possible change in water temperature from a cold start condition at 60oF to 212oF
  11. How is shield cooling temperature controlled?
    • Throttling MV-CC106, HX outlet valve
    • -Butterfly valve
  12. Normal shield cooling flow
    • 134-154 gpm
    • -normally 20-25 gpm to floor coil
  13. When is shield cooling placed/removed from service?
    165oF
  14. Chemistry control of shield cooling system
    • Chem add tank T-97 on the east mezz
    • -don't use
    • Add through surge tank sight glass
    • 550-1000 ppm sodium nitrite
  15. What are the P-77A/B shield cooling pumps ratings and power supplies?
    • 180 gpm each
    • Approximately 61 psig discharge pressure (35 psig and suction head of 26 psig)
    • P-77A
    • -MCC-2
    • P-77B
    • -MCC-1
  16. What is the shield cooling low flow alarm setpoint?
    • </= 80 gpm on the inservice coil
    • The alarm is bypassed when the inlet supply valve is closed
  17. What is the shield cooling high temperature alarm setpoint?
    120oF
  18. What are the high/low alarm setpoints for T-62, shield cooling surge tank?
    • High
    • -95% (80 inches)
    • Low
    • -4.5% (20 inches)
    • Normal
    • -23-86%

What would you like to do?

Home > Flashcards > Print Preview