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20 Cards in this Set
- Front
- Back
Essential Service Water Purpose |
Safety Related Functions -provides the primary heat sink for heat removal from the following systems: --CCW --CTS --CRAC --EDG --Auxiliary Feed Pump Room Coolers
-Provides an alternate makeup water source for Emergency Diesel Jacket Water System
-Supplies AFW pump suction when the normal water supply (CST) is unvailable
-Provides the capability to automaticaly backflush the ESW pump discharge strainers
Non- Safety Related -Transferes heat to the ultimate heat sink from the CCW system -Provides the necessary heat removal to support safe shutdown and satisfy NFPA 805 requirements |
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Minimum flow from ESW Pump |
2000 gpm (>= 3500 for pump efficiency) (max10,000gpm) |
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ESW Pump Starts |
In Neutral - SI in EITHER Unit or Loadshed (LOOP) Sequence signal auto start pump.
In Auto - -Starts when header pressure is <40 psig. -Receipt of SI in EITHER Unit or Loadshed (LOOP) sequence signal while auto start pump when in AUTO.
MANUAL |
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ESW PUMP TRIPS |
LOADSHED Overload Instantaneous Overcurrent Manual |
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ESW to EDG SUPPLY VALVE |
Normal supply to EDG will open on EDG Run Signal. Alternate Supply to EDG is Manual Only! Opening Alternate Supply to EDG will cause the EDG to be Inoperable. |
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ESW from CTS Heat Exhanger Outlet |
Opens to provide >2,400 gpm flow to the CTS Heat Exhanger upon receipt of a CTS Signal coincident with the associated Recirculation Sump Valve being open. |
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ESW Pump discharge valves |
Automaically open on associated pump start (Automatic or Manual starts) *does not Auto Close |
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ESW Pump Discharge Strainer |
-Automatic backwash of strainers at 86.5 inH2O -And once every 24 hours on timer |
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ESW from CCW Heat Exchanger Outlet |
Automatically reposition to supply 5,000 gpm through the CCW Heat Exchanger on receipt of a Safety Injection Signal |
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ESW Sequence Start |
Loadshed (LOOP) w/o SI - 7 seconds Loadshed(LOOP) w/ SI or CTS - 19 seconds |
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Control Air |
Control Air to Backwash valves in Both Units is supplied from Unit 1 with Backup Air Bottles taking over at 42#. |
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ESW Header Loads |
AFW Pump Room Coolers (supplied by same train) EDG Air Aftercoolers/ Lube Oil Coolers /Jacket Water Coolers (Also - Provides backup supply to Jacket Water)
CTS Heat Exchangers CCW Heat Exchangers CRAC- Condensers (Also - Backup to Vent Unit Cooling Coils) Alternate Suction Supply to AFW Pumps (TDAFP -west, MDAFP's - east) Radiation Monitor Sample Heat Exchangers |
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ESW Fan Starts |
Odd Fan Autostarts on Pump Start Even Fan Autostarts at 90F Room Temperature |
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Essential Service Water Pump -Loss of Control Power |
Loss of 250VDC disables remote breaker operation |
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ESW Pump Discharge Valves -Loss of Control Power |
Valves fail as is on loss of power |
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ESW pump discharge strainers |
Backwash Valves fail closed on a loss of control air and backup air supplies. Motor operated gate Valves will fail as is. |
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Loss of Control Air or Control Power for the Inlet and/or Outlet valves for the following components: CCW Heat Exchangers Containment Spray Heat Exchangers Diesel Generator Cooling Control Room AC Auxiliary Feedwater emergency Supply |
All Fail as is |
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ESW Transfer switches |
Located on the Hotshutdown pannel. Switch to transfer ESW Pump Control Switch to transfer ESW Pump Strainer |
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Parameters used to verify proper ESW Flow |
Supply Header Flow - downstream of cross-tie pipe
Return Header Flow - indicate flow at return header before common discharge piping.
Pump and Header pressure
Interfacing component flow
ESW header return temperature
Radiation detection
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ESW Technical Specifications
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TS 3.7.8
One train of ESW to assist in the removal of core decay following a design basis loss of coolant accident (LOCA). The ESWsystem removes heat from the RHR System (from RHR entry until MODE 5). One ESW train is sufficient to remove decay heat in Modes 5 &6.
**Require 2 offsite sources + EDG + DC (your unit) 1 offsite (EP must be I/S to count) + EDG + DC |