Term
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Definition
| Serves as the ultimate heat sink between the plant and the Delaware river for various heat loads in the Auxiliary, Containment and Turbine Buildings. |
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Term
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Definition
Located 200 yards from shipping lanes
Marine Dock bumpers prevent damage from barge collision
Seismic Class 1 structure
Designed for Delaware river level, PH, temperature and Chlorides |
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Term
Design Basis
Service Water Pumps |
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Definition
Minimum of 2 SW Pumps required for Safeguards
3 Pumps per Bay / 2 Bays per unit
Pumps provide Screen Wash, Strainer Backwash, and cooling for the pump motor bearing oil cooler
Min River level = 76 feet for Pump suction 71' 3" |
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Term
In the event of an SEC Mode Op, What number of SW Pumps are required to start?
Name the Primary vs. the back up pump and the Bus that feeds them. |
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Definition
One Primary SW Pump from each Vital Bus will start if neither pump is running. The backup pump will start within 5 seconds in the event the primary pump fails to start.
Note: EDGcan support only one SW Pump per Bus
Unit 2 Primary SW Pumps: 21 (A), 24 (B), 25 (C) |
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Term
How many SW Pumps are required for minimum Safeguards Equipment to shutdown a unit Safely?
Minimum Safeguard Equipment? |
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Definition
2 SW Pumps
2 EDGs
1 CC HXs
3 CFCUs
1 Trian of ECCS components/Room coolers
NOT limited by any single failure |
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Term
| What is the normal number of pumps running at full operation of the plant? |
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Definition
4 SW Pumps in service during the Summer
3 SW Pumps in service in the Winter
1 Pump in Auto for maximum heat loads
1 pump in Manual (OFF) |
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Term
What is the normal SW Header Pressure?
When will the Standby Pump Auto Start? |
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Definition
NHP = 105-125psi
SW Hi Pressure Alarm = 160psi
Auto start of the standby Pump = < 95.5 |
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Term
State the purpose of the SW17 valves.
What is the effect on operability regarding the SW17s? |
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Definition
SW17 cross connect the SW baysand allow continued operation with any combination of pumps.
Closing either SW17 valves will isolate the bays and 1 nuclear Header MUST be declared inoperable. due to concerns with pump runout and loss of NPSH |
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Term
| State the purpose of the SW308 and SW311 Valves. |
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Definition
| Recirculation valves that provide minimum flow protection for the SW Pumps ensuring up to 3000gpm for 3 SW pumps by modulating to maintain 150 PSI in each bay. |
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Term
| Name the 4 Modes of operation for the SW Travaling Screens. |
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Definition
Auto: Places Screens and Screen Wash in Automatic Control. Starts on >5" H2O Dp runs for 22 Minutes. Trouble alarm @ >6" or longer run time than 22 min.
Start: Bypasses the timer and starts the screens
Inch: Bypasses the timer and allows the operator to inch the screen forward
Test: starts and runs the screen for 22 minutes
Note: Screens will NOT start unless 55psi of Screen Wash Header is present. |
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Term
| SW Pumps are designed to Pump... |
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Definition
| 10,000 gpm at 240' of Head |
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Term
| State the purpose of the 4KV Test-Normal Key Switch and location. |
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Definition
Normal Operation: Key Switch selects 24 as the lead SEC pump.
4 Bay unavailable due to 4.0.5.P or 24 Pump and motor is uncoupled, the switch must be repositioned to Test, which reassigns 23 pump as the lead SEC pump |
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Term
| SW Strainers start rotating in auto whenever... |
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Definition
| the associated SW Pump starts. |
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Term
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Definition
Normally, Begins @ 5psid and continues for 3 Minutes after reaching <4psid
Tech Specs require the Strainer to be run in AUTO
OHA alarms @ 8 psid |
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Term
SW 4 bay Isolation from the TGA Header occurs when...
SW 2 bay Isolation from the TGA Header occurs when... |
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Definition
23SW20 and 2SW26 Valves close.
21SW20 and 2SW26 Valves close. |
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Term
| Spray wash Lines are protected from freezing by... |
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Definition
| Isolation valves closing and drain valves opening. |
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Term
How does the SW strainer Normal/bypass switch effect the strianer blowdown?
How does Blowdown effect Chlorination? |
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Definition
If in Bypass the blowdown runs continuously.
When Blowdown is OOS, then Chlorination is OOS |
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