LOT 202.20 Stator Cooling Water Flashcards
- LOT 202.20 Stator Cooling Water*
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Where in the Control room are the alarms for Stator cooling water?
CP007
- LOT 202.20 Stator Cooling Water*
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What cools the stator cooling water?
CL-ACW
Loads:
- Stator Conductors
- Main lead bushings
- Neutral Bus bushing
- Current Transformers
- LOT 202.20 Stator Cooling Water*
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What D/P across the stator will trip the turbine?
Stator Cooling Water D/P - Low (19 psid) [2/3] [40 sec TC]
Will get alarm in ZLP-150 (Basement Shelter) after 10 sec [1/3]
Note:
This is D/P across the stator. Do not confuse with D/P across the running pump. (Auto Start of standby SCW pump)
- LOT 202.20 Stator Cooling Water*
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What stator cooling water parameters would cause the operators to manually trip the reactor and turbine if > P-9?
- *SCW D/T - High (≥ 21.5 ˚F)**
- U5524 / U5525*
- *SCW Temperature - High (194 ˚F)**
- U5520 / U5521*
- LOT 202.20 Stator Cooling Water*
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What gas is used to minimize corrosion in the SCW expansion tank?
Hydrogen (2 psig)
H2 from generator leaks into SCW system
- Relief setpoint: 5 psig
- LOT 202.20 Stator Cooling Water*
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What supplies makeup water to the SCW expansion tank?
Demin Water
Auto makeup causes “Makeup Water Flow ON” on ZLP-119 (Local 29’ TGB) and trouble alarm on CP007.
- Manual makeup does not cause alarm
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Note:
Relief setpoint: 90 psig
- LOT 202.20 Stator Cooling Water*
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What is the purpose of the alkalizer skid?
- *Minimize Cu / CuO2 on stator bars**
- Deposits lead to poor HX*
Injects NaOH
- Note:*
- Located next to skid (29’ TGB N Side)*
- LOT 202.20 Stator Cooling Water*
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Why is water used to cool the stator?
High Thermal Conductivity
High Specific Heat Capacity
- *Reduced Cost**
- Permits reduction in stator diameter / weight*
- LOT 202.20 Stator Cooling Water*
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What will auto start the standby SCW pump?
Running Pump D/P - Low (≤ 20 psid)
