Card Set Information
SFP advanced systems
What must be done with a full core offload and SDC system being used for cooling the SFP?
Monitor fuel pool level and LPSI pump
-continuously until stable for 10 minutes
-hourly after that
SFP boron concentration admin limit?
>2550 ppm boron
How will a low spent fuel pool water level impact the spent fuel pool cooling system?
-low pump suction pressure
-loss of cooling
Purpose of the SFP cooling system?
Remove decay heat from spent fuel stored in the fuel.
Designed to maintain temperature less than 150
F with a maximum of one spent fuel cooling pump operating.
What is the impact of a loss of a SFP cooling pump?
Indications of low level
Potential damaged fuel if the condition persists long enough
Spent fuel pool heat exchangers (E-53A/B)
Designed to withstand a temperature transient of 60
F to 212
F in 5 seconds
Cooled by CCW
Design features that prevent loss of water in the SFP?
Maximize water level minimizes rad levels
No drains in the main pool
Inlet/outlet piping are close to the SFP surface, these failures only cause about a 3 foot loss of water level
SFP recirc booster pump P-82?
Powered from MCC-8
SFP PPC temperature alarms
Low at 75
High at 125
High high at 140
Mixed bed demineralizer
Design flow of 150 gpm
Design pressure of 200 psig
Design temperature of 220
Normally 140-150 gpm
What are the SFP normal and design temperature limits?
-lower limit for maintaining above 40F assumed in the criticality analysis
-upper limit for protecting the demineralizer resins
May be widened to 75-140
-lower for the criticality analysis
-upper is for no localized boiling at the surface of the hottest fuel rod
Time to boil for a loss of cooling in the SFP
8 hours for 1/3 offload
3 hours with full core offload
What are the SFP cooling pumps P-51A/B ratings and power supplies?
40 HP motor
LCO 3.7.15: SFP boron concentration
: SFP boron concentration shall be >/= 1720 ppm
: When fuel assemblies are stored in the SFP
: LCO 3.0.3. is not applicable
SFP boron concentrations are not within limits
-suspend movement of fuel assemblies in the SFP-IMMEDIATELY
-initiate action to restore SFP boron concentration to within limits-IMMEDIATELY
LCO 3.7.14: SFP water level
: The SFP water level shall be >/= 647 ft elevation
: SFP level may be below the 647 ft elevation to support fuel cask movement, if the displacement of water by the fuel cask when submerged in the SFP, would raise SFP level >/= 647ft elevation
: During movement of irradiated fuel assemblies in the SFP.
During movement of a fuel cask in or over the SFP
: LCO 3.0.3. not applicable
: SFP water level not within the limit
-suspend movement of irradiated fuel assemblies-IMMEDIATELY
-suspend movement of the fuel cask in or over the SFP-IMMEDIATELY