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37 Cards in this Set
- Front
- Back
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Removes a sufficient amount of heat from the main condenser to allow the steam being exhausted from each Low Pressure Turbine to be condensed to water.
Release the heat absorbed from the Main Condenser via the Cooling Towers. Supply blowdown for dilution of LWS discharges. |
Circ Water System
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Circulating Water Pumps,
CWS-P1A (B/C/D) ______ capacity CWS pumps take a suction from the divided pumpwell Single stage, vertical, centrifugal, 127,890 GPM, Discharge Head 35 psig, 395 RPM Powered from: NNS-SWG2A – CWS-P1A/C NNS-SWG2B – CWS-P1B/D |
Four (4), 25%
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CWS Pump Operation
Normally (100% power), four (4) CWS Pumps operating Draw water from individual pump well for that pump Intake screen, Stop Log Pump start is _____ Discharge valve starts to open when pump starts |
LOCAL (Switchgear)or REMOTE (MCR)
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CWS Pump Operation
Pump Start CWS Flume level drops due to draw down; amount depends on # of pumps already running (4-8 in.) Pump Stop/Trip CWS Flume level rise occurs; amount depends on # of pumps already running (4-8 in.) ____ is first to overflow |
D Cooling Tower
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CWS Pump Controls and Interlocks
REMOTE START Transfer switch in the REMOTE position Electrical protection reset Pump Discharge valve fully ___ Condenser inlet and outlet water box valves for one condenser (both water boxes) open START pushbutton depressed (Harris Panel -MCR) |
closed
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LOCAL START
Transfer switch in the LOCAL position Pump discharge valve fully closed Condenser inlet and outlet water box valves for one condenser (both water boxes) ____ Control switch in____(Pump Breaker) |
open / CLOSE position
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CWS Pump Trips
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Electrical Protection
Sustained Bus Undervoltage Circulating water pump running and discharge valve not fully open after time delay has expired. (110 sec) |
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CWS Pump Discharge Valves, CWS-MOV16A/B/C/D
78” Motor operated butterfly valve Opens when the pump is ____ IF the valve is not fully open within ____ seconds, THEN the CWS pump trips. Close when pump is stopped WHEN a stop signal is given, the valve begins to close, and THEN the pump trips 110 seconds after the stop signal. |
started / 110
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CWS Vacuum Priming System (VPS)
Evacuates the air from the circ water piping upstream and downstream side of each pump discharge valve via the Air Release Valves (ARV) Prevent water hammer on start of CWS Pump Back-up source for ___ VPS-P3, Vacuum Priming Pump is powered from ___ |
Bearing Cooling Water System
NHS-MCC11A (CWS Swgr Bldg) |
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Bearing Cooling Water (BCS)
Provides cooling water to CWS Pump Motor and Pump bearings ____ capacity pumps _____ flow indicators for each CWS Pump BCS-P3A(B), Bearing Cooling Water Pump A(B) is powered from ____ (CWS Swgr Bldg) |
Two (2), 100%
Two (2) NHS-MCC11A(B) |
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BLOWDOWN
Helps maintain a low average solid content in the ____ Allows for dilution for ___ Helps maintain flume level control 14” tap off the 144” discharge line and leads to the blowdown pit. _____ is injected to ensure complete elimination of any residual chlorine. |
Circ water system
plant discharges Ammonium Bisulfite |
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Condenser Isolation Valves, CWS-MOV4/5 (A/B/C/D)
Each condenser has an inlet and outlet 78” I.D. ___ valve __ total; all controlled from the ___ The inlets open fully with the outlets open ___ when full open for flow control Between the valve and waterbox is a Polyester/Chlorobutyl ( rubber ) expansion joint. Must be opened prior to start of CWS Pumps – CWS Pump will not start Two water boxes in the same condenser must be valved-in |
Butterfly
8 MCR 26% |
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Cooling Towers
Circulating Water is cooled by __ round Mechanical Draft Cooling towers utilizing Cross-flow design in a precast concrete structure. The circulating water flows circumferentially in the flume with radial delivery of water to the distribution basin by weirs located in the top of the outward bound wall of the flume. |
4
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COOLING TOWERS
The required air flow is induced through the fill ring and then discharged by __ fans grouped at the center of the tower. |
8
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REMOTE START
Control transfer in REMOTE position ____ trip reset ____ trip reset START pushbutton depressed (where:__) |
Inverse time and instantaneous overcurrent
High vibration MCR HARRIS Panel |
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CWS Cooling Tower Fans
TRIPS |
Inverse time or instantaneous overcurrent trip
Sustained bus undervoltage High Vibration in and fan running for preset time. (10 sec) |
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Water is lost from the Circ Water System in three ways:
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Evaporation
Drift Blowdown |
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Warm air with entrained moisture that leaves the cooling towers
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DRIFT
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Supplies water to the circulating water flume to makeup for losses resulting from evaporation and drift. (Approx. 13,000 gpm at 100% power)
To supply makeup water to replenish a blowdown rate of 2200 gpm (minimum) to 3450 gpm (maximum) (2700 gpm currently) To remove suspended solids by chemical flocculation and clarification of Mississippi River water. Water gravity drains from the inservice Clarifier CWS Flume and SWC Basin level is controlled utilizing MWS-AOV267, CWS Flume Makeup Valve MWS-LCV52, SWC Basin Level Control Valve MWS-AOV267 is opened/closed from ACR to adjust CWS Flume level Provides backpressure to force water to the SWC Basin, MWS-LCV52 |
Cooling Tower Makeup
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Control Valve Operation
MWS-AOV267 and MWS-LCV52 FAIL OPEN on a loss of Air – So what? ____ Low flow conditions (winter operations) can cause issues with SWC Basin level Even with MWS-LCV52 full open, sufficient flow may not be available Throttling MWS-AOV267 closed may be necessary to raise level in SWC Basin Caution must be taken not to overflow Clarifier Backpressure from MWS-AOV267 (>60% closed) |
All M/U water going to CWS Flume – High level in CWS Flume/Low level in SWC Basin
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CWS Flume & Level Indication
CWS Flume Concrete, ~600 ft long, 22-36 ft wide, max depth is ~21 ft Connects outlet of each CWS Cooling Tower to the suction of the CWS Pumps Level Indication Remote indication (ACR) via bubbler type level transmitter supplied by Instrument Air (IAS) Loss of air - ____– fails ____ How’s that work? FUNdamentals Local indication on Flume wall near MWS-AOV267 |
loss of remote level indication / LOW
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Provide clean chemically controlled cooling water to remove heat from:
Turbine plant auxiliaries Reactor plant auxiliaries Non-safety related system supplying all loads during normal operation. |
NSW
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NSW
Provide clean chemically controlled cooling water to remove heat from: _____ _____ related system supplying all loads during normal operation |
Turbine plant auxiliaries
Reactor plant auxiliaries Non-safety |
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NSW
____ loop cooling to vital and non-vital components. __ pumps running - 54,000 gpm @ 133 psig Cooled by Service Water Cooling |
closed 2
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NSW cooled by ___
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SWC
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NSW
Type of Pumps Double suction, volute centrifugal pumps Horizontal mounted ___ capacity (Rated: 31,500 gpm @ 93 psig) Controlled from CR Harris Panel or Local SWP-P7A, P7C -- NNS-SWG2A SWP-P7B -- NNS-SWG2B Control transfer switch at SWG (Circ Water) |
50%
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NSW PUMPS
Lockout/Elect. protection reset LOCAL Transfer in either LOCAL or LOCAL AUTO Breaker control switch to ___ Discharge valve __ open REMOTE Transfer in REMOTE Harris panel Pump selected and START button depressed Discharge valve ___ open |
SHUT
10% 10% |
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NSW PUMP START - AUTO
Auto trip of running pump (except _____) ___service water pump discharge pressure ___ psig |
low suction pressure
low / 97% |
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NSW PUMP TRIPS
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Elect. trip (86 device) includes low suction press
Undervoltage Low suction pressure 5 psig (2 out of 3) 45 sec TD Locks Out standby pump as well Inside Pump Isolation Boundary SOP-0018 P&L 2.5, 2.8 |
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NSW PUMP TRIPS
Elect. trip (86 device) includes low suction press Undervoltage Low suction pressure 5 psig (2 out of 3) 45 sec TD Locks Out standby pump as well Inside Pump Isolation Boundary SOP-0018 P&L 2.5, 2.8 Why 45 Seconds? |
To allow the Standby Service Water System to start up and be isolated from Normal Service Water without causing a loss of Normal Service Water on low suction pressure.
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NSW Discharge Valves
Pump discharge valves SWP-MOV170A, B, and C 36” ____valves Auto ___ on pump start No local or remote controls?!?!? Power supplies A & C NHS-MCC11A B NHS-MCC11B |
butterfly
open |
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19,460 gal used of 38,920 capacity
8-10 psig Nitrogen pressure SOP-0018 P&L 2.13 Level 18.5-20.5 feet Pressure and level indication local SWC-PNL100 remote P808 |
NSW SURGE TANK
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SURGE TK MU VALVE (Obj 1, 2)
Cycles to maintain level Flow orifice limits flow to 100 gpm to prevent tank over pressurization ___ for AOV failure. Controls & Ind. Local transfer sw. LOCAL/REMOTE Local OPEN/CLOSE sw Remote from P808 OPEN/CLOSE MANUAL/AUTO |
Manual bypass
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NSW LOADS-non safety
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Main Generator Hydrogen Coolers (GMH-E1A, B, C, D)
Main Generator Alternator Cooler (GMH-E2) SJAE Inter Coolers (ARC-E3A and B) Main Turbine Lube Oil Coolers (TML-E1A, and B) Turbine Plant Component Cooling Water Heat Exchangers (CCS-E1A, B, C) Electro-Hydraulic Control (EHC) Oil Coolers (TMB-E1A, and B) and Steam Bypass EHC Coolers (C85-TXD002A, B) Turbine Building Sample Room Chiller (HVT-CUR1) Turbine Building Chilled Water Condensers (HVN-CHL1A, B, C) Radwaste/Fuel Building Chilled Water Condensers (HVN-CHL2A, B, C) |
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NSW LOADS- safety
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Auxiliary Building Unit Coolers HVR - UC2- 11B(UC5 both loops)
Residual Heat Removal Heat Exchangers Control Building Chilled Water Condensers Standby Diesel Generator Coolers HPCS Diesel Generator Cooler (can be supplied by both loops) Reactor Plant Component Cooling Water Heat Exchangers (can be supplied by both loops) Containment Unit Coolers Drywell Unit Coolers (can be supplied by both loops) Residual Heat Removal System Penetration Valve Leakage Control System Air Compressor Coolers Auxiliary Building Radiation Monitor Coolers (RMS-RE11A/B, 15A/B) Control Building Ventilation Chilled Water Supply (off-normal supply) Reactor Plant Component Cooling Water CCP Makeup Supply (off-normal supply) (can be supplied by both loops) Fuel Building Fire Protection Cross-Tie Auxiliary Building Fire Protection Cross-Tie Control Building Fire Protection Cross-Tie |
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Loads that are common to both SSW cooling loops?
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DW unit coolers
A/B unit cooler #5 HPCS D/G RPCCW ADHR |
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NSW INTERRELATIONS
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SSW
MWS Corrosion Coupon Rack Elect. Distribution 4160 480 120 125 |
