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26 Cards in this Set
- Front
- Back
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Circulating Water Pump Trips |
-Manual Control Room Control Switch -Over Current -Under Current on associated 4kV bus (55V) |
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Circulating Water Pumps Discharge Valves |
-Auto Opens when associated pump AUTO Starts. Must be manually openend on manual start. (Prevents pump runout.) -Auto Closes on associated pump breaker opening. (Prevents short cycling system.) |
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Circulating Water Pump Auto Start |
-Control Room Switch in AUTO - the auto start on failure of a running pump. |
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Screen Functions |
-When in Auto, Screens auto start on timer or differential level. (Increases speed with increasing D/P) -25" H2O = max screen speed -Starts on variable setpoint and runs until D/P is <4" for 5 seconds + 5 minutes |
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Circulating Water Pump Power Supplies |
#11(21) - 1D(2D) #12(22) - 1A(2A) #13(23) - 1B(2B) #24 - 4C |
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Circulating Water System Loads |
-NESW -Main Condensers -Feed Pump Condensers -Radiological Liquid Waste -Turbine Room Sump Overflow -TACW -Chlorine Injection (xtie) -Miscellaneous Sealing Cooling Water (xtie) -Lawn Sprinkler System (xtie) |
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Circulating Water System Support |
-Chlorine Injection -Miscellaneous Seeling and Cooling Water(From NESW Now) -Screen Wash System -Vacuum Priming |
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De-Icing Flow Path |
From a single unit discharge (WMO-16 or 26), through the de-ice tunnel and out the middle intake tunnel(WMO-30 is closed)
Close WMO-30 Open WMO-16 or 26 Throttle WMO-15 or 25A/B to control forebay temperature |
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Indications of Icing |
-Circulating Water Temperatue <= 35F -There is greater than one foot of drawdown in the forebay not caused by starting a pump. -Traveling Screens high and/or extreme high differential pressure alarms are annunciating with little or no trash collection in the screen wash trash. |
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Circulating Water Pumps Operation should not occur below what elevation? |
565 Feet which is the low low level setpoint |
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Forebay level monitoring |
40 radar units monitor level -One on East and West side of each screen(28 Total) -12 Feed the control room recorder |
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WMO-17 & 27 function |
They provide emergency suction source for ESW pumps in the event CW intake tunnels collapse. |
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Technical Specification 3.7.9 |
Ultimate Heat Sink must be operable and under 88.8F |
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Purpose of Circulating Water System |
Safety Related Function - Provide water source to the essential service water system pumps. This is based on heat sink requirement.
Non-safety related - -provide a heat sink for waste heat from the plant thermal cycle -provides a water source to various systems and equipment -support operation of the steam dump system -provides dilution to perform a radioactive release. |
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Screen Wash System Purpose |
-Remove fish and debris from traveling screens to maintain a water supply to the circulating water system -Prevents screen damage due to excessive differential |
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Intake Cribs |
Surround and support the flared upright intake elbow. A fish deterent system is mounted to intake crib ice guards. |
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Screen house Forebay and Bar grills |
Provides structural support for the trash racks, travelling screens, circulating water pumps, esw pumps, and associated equipment. Trash racks prevent large objects from damaging the the traveling screens |
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Circulating Water Pumps |
Provides head necessary to maintain circulating water flow. Bearing and packing cooling comes from miscellaneous seal cooling water. |
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Circulating Cross Tie Loads |
Cross tie from U1 to U2 A condenser outlets
-Chlorination system -Lawn Sprinkler -Miscellaneous Sealing and cooling water System
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Circulating Water System Loads |
-Essential Service Water -Non-Essential Service Water -Miscellaneous Seal Cooling Water -Feed Pump Condensers -Main Condensers -Lawn Sprinkler System -Chlorination |
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Loads that Circulating Water Discharges |
-Essential Service Water -Non-Essential Service Water -Main Condenser outlets -Feed Pump Condenser outlets -Radwaste Release -Turbine Room Sump Overflow -Condensate Dumps
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Vacuum Priming System |
Removes Non-condesible gases from all of the heat exchangers and horizontal centrifugal pumps.
One pump runs on both units and rest on AUTO. Kick on as vacuum degrades (4 on Unit 1 and 5 on Unit 2)
If the System failed, tubes could become uncovered, cause reduced flow and reduced efficiency due to decreased vacuum. |
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Circulating Water Pump Switch |
Four Position -Trip- trips breaker open -Neutral - disables auto feature -Auto-allows pump to auto start on the falure of a running pump, and enables an interlock that operates associated discharge valve -Close - closes breaker |
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Circulating Water Pump Discharge Valve Switch |
Three Position -Close - closes valve -Pull-To-Stop - stops any travel,open or close, spring retrun to Pull-To-Stop position -Open Auto-Closes on pump breaker opening |
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Condenser Inlet/Outlet Valve Switch |
Three position Switch -Closes - Closes valve -Pull-To-Stop - Stops travel, open or close -Open - Opens Valve
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Circulating Water Forebay Levels/Actions
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578' Average Lake Level 565' Low Level Alarm 562' Extreme Low Level - Unit Shutdown Required & Stop All circulating Water Pumps
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