Term
| Function of Circ water system |
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Definition
| Remove heat energy from plant cycle in the main condenser and dissipate this energy to the river or to the atmosphere via cooling towers. |
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Term
| Flow, above which open (circ water) cycle is used. |
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Definition
| Open cycle operation is used when river flow is above 860 CFS and cooling of the circ water effluent is not required to keep the max daily average discharge canal temperature below limit. |
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Term
| Flow limit below which power operation is not allowed |
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Definition
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Term
| Daily average maximum flow appropriation |
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Definition
| 645 cfs provided river flow is at or above 860 cfs. Otherwise, 75% of river flow (when below 860 cfs). |
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Term
| When should traveling screens be set for automatic operation? |
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Definition
Any time the Circ water or Service Water systems are operating. NOTE: Above 50 degrees F, traveling screens are to be placed in continuous operation when circ pumps are operating. |
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Term
| Whenever upstream river temperature is 50 degrees F or below, what is the limit in temperature change? |
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Definition
| Should not drop more than 5 degrees F in one hour. (fish can sweat, but they can't freeze) |
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Term
| With upstream river temperature at or below 50 degrees F, what conditions require ERAD-Supervisor notification? |
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Definition
A complete shutdown is anticipated; A scram occurs; The 5 degree F per hour drop limit is exceeded.
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Term
| Whenever upstream river temperature is above 50 degrees, what is the limit in temperature change? |
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Definition
Discharge canal temperature may rise or drop at any rate (no limitations). |
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Term
| When should de-icing line be open and the EPA Hot Water Pumps placed in service? |
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Definition
When the river inlet temperature is below 35 degrees F. |
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Term
| Power supply to 11 Circ Water Pump Motor |
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Definition
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Term
| Power supply to 12 Circ Water Pump Motor |
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Definition
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Term
| Power supply to 11 Circ Water Pump Motor Exciter |
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Definition
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Term
| Power supply to 12 Circ Water Pump Motor Exciter |
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Definition
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Term
| Power supply to 11 Circ Pump Discharge Valve |
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Definition
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Term
| Power supply to 12 Circ Pump Discharge Valve |
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Definition
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Term
| Power supply to Condenser discharge and inlet valves |
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Definition
| All four come off MCC-131 |
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Term
| CW pump will start only if… |
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Definition
| Discharge valve is closed. First pump to start requires both discharge valves closed. |
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Term
| Cooling tower pump sequence |
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Definition
Switch to start: Pump starts immediately, 10 seconds later discharge valve jogs open (2 seconds jog, 8 second wait); If valve not full open in 3 to 4 minutes, another timer inhibits valve movement.
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Term
| First circ pump start sequence |
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Definition
Upon taking control switch to PUMP START position: Both condenser outlet valves move to intermediate-high position; Pump starts (against a closed discharge valve); Five seconds after pump start, discharge valve opens (designed to open in 20 seconds).
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Term
| Second circ pump start sequence |
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Definition
Upon taking control switch to PUMP START position: Pump starts (against a closed discharge valve); Five seconds after pump starts the following simultaneously occur:
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Term
| First circ pump shutdown sequence |
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Definition
Upon taking control switch to SHUTDOWN position: Both condenser outlet valves move to intermediate-high flow position; Pump discharge valve starts moving to the fully closed position; Upon discharge valve full closed, pump trips.
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Term
| Second circ pump shutdown sequence |
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Definition
Upon taking control switch to SHUTDOWN position: Both condenser outlet valves move from intermediate-high flow to intermediate-low position; Pump discharge valve starts moving to the fully closed position; When discharge valve is fully closed, pump trips and both condenser outlet valves fully close.
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Term
| What protects the circ water system from overpressurization on column recovery following an automatic trip of one or two circ water pumps (which may induce column separation)? |
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Definition
| Automatic air admission valves at the condenser water boxes. |
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Term
| How is column separation during manual shutdown of circ water pump avoided? |
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Definition
| Condenser outlet valves automatically moving to intermediate-high flow position. |
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Term
| Describe the circ water pit flooding setpoints |
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Definition
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Term
| Describe the condenser pit flooding setpoints |
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Definition
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Term
| What is ERAD's interpretation of consistently? |
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Definition
3 consecutive days. Specifically, "all available cooling water equipment SHALL be placed in the helper mode when the daily average upstream river temp is anticipated to be at or above 68 degrees F for 3 consecutive days." |
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Term
| Daily average temperature at the end of the discharge canal limit during April - October (summer). |
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Definition
| 35 degrees C (95 degrees F) |
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Term
| Daily average temperature at the end of the discharge canal limit during November and March |
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Definition
| 29.4 degrees C (85 degrees F) |
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Term
| Daily average temperature at the end of the discharge canal limit during December through February (winter) |
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Definition
| 26.7 degrees C (80 degrees F) |
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Term
| Halogen discharge concentration limit |
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Definition
| "SHALL NOT at any time exceed 0.2 mg/L measured as total residual Halogen, and the discharge of Halogenated water SHALL NOT exceed a total of 2 hours per day." |
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