Term
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Definition
| Remove decay and sensible heat. Control water chemistry and activity (SFP, RWST and Refueling Canal). Improve visual clarity. |
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Term
| SFP Cooling Design Basis: |
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Definition
- Under normal conditions temperature limit is 147F
- Under abnormal conditions temperature limit is 180F, with the following assumptions CCW is <95F, CCW Flow > 3000 gpm, SFC 2300 gpm.
Design Basis Heat Load:
- EOL 2 Pps, 2 HXs, 10% plugged tubes=147F
- EOL 1Pp, 2 HXs, 10% plugged tubes= 150F
- Suction is 4 feet below surface of pool
- Return line discharge 6 feet above the top of the fuel and has a 1/2 inch anti-siphon hole below pool surface
- Redundant weir gates (preclude loss of water with transfer pool empty)
- SFP Racks Seismic Class I, Piping Class II
- Storage Capacity 1632 fuel assemblies
- Redundant Pps, power from different vital buses
- SFP system entirely manual, controlled from the field.
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Term
SFP Cooling- Major Sub systems
Cooling |
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Definition
SFP Pps- max flow 2300 gpm at 150 psig.
Powered From:
21- 2C 460V AC Vital Bus
22- 2B 460 V AC Vital Bus
One PP can serve two HXs
Interlocks- PP will stop on SEC modes II, III, IV, requires an SEC reset and manual start.
Heat Exchanger: Shell (CCW) and U-tube (SFP), designed for 3000 gpm CCW, 2300 gpm SFP, 150 psig, 200F. |
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Term
SFP Cooling- Major Sub systems
Purification System |
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Definition
- Sidestream flow from Pp discharge header can be diverted thru SFP Demin and Filter OR just the Filter.
- Max Flow 100 gpm, min flow 40 gpm
- Inlet Temperature <130F
- Max Filter DP 20 psid
- Max Pressure 200 psig
- Mixed Bed Resin
3 Sources Can use this DM/Filter System
SFP, RWST, Refueling Canal
SFP Filter- replaceable element, max flow, 100 gpm, DP clean 1.45 psid, max DP 20 psid, at 150 gpm |
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Term
SFP Cooling- Major Sub systems
Skimmer |
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Definition
Skimmer Pp- manually controlled at FH Control Center
Flow 100 gpm, Pressure 50 psig, Temp 200F, Powered from #2 FH Area 230V MCC
Skimmer Strainer: Basket, 100 gpm, DP Clean .6 psid, Dirty Max DP 10 psid
Skimmer Filter- Replacable, 100 gpm, DP Clean 1.45 psid, Max 20 psid. |
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Term
SFP Cooling-
Monitored Parameters and Setpoints |
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Definition
Temperature:
normal 75-85F
max 110F
Alarm 125F---- OHA
Level:
normal: 128'8"
low: 128'2"--OHA
high: 129'2"--- OHA
TS minimum level is 23' above the top of the fuel assemblies, 127' 2 1/4"
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Term
SFP Cooling-
Make Up Sources and Valve Line Ups |
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Definition
In order of preference:
- DM water: SF58 to SFP Pp discharge
- PWST: SF44 to Purification Loop
- CVCS HUT: SF71 and HUT Recirc Pp to SFP Pp discharge header
- RWST: Piped to purification loop via RWP Pp or hosed to pool via portable Pp
Emergency Make Up:
Multiquip Portable Diesel Pp. Capacity 111.5 gpm to both pools simultaneously, max design basis 92.3 gpm |
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