AOP-301 (3) Main Generator Malfunctions
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11 Terms
Symptoms and Entry Conditions
Hydrogen pressure/cooling
Stator temps
Voltage/VARs/Spider Curve
Seal Oil Differential Pressure issues
(Step 1 Continuous Action RNO Flowpath)
Cannot maintain <4.35psid
Start standby MSOP
*No auto-start, 20sec interlock before able to start standby pump
If that doesn’t work, ensure Emerg. Seal Oil Pump running
*Should have auto-started 14.5psig
NO pump running Go To Step 12 (Trip and Purge)
Swap strainer per SOP if clog expected
Hydrogen Pressure
NOP?
Turbine Trip Action?
How to maintain within Capability Curve with lowering Hydrogen Pressure?
(Step 2)
73-78psig NOP
50psig Trip, A-207 While Continuing A-301, Trip Both Stator Cooling Pumps, Isolate H2 manifold, Purge, Both roof ventilators
Reduce Turbine Load per A-101
If Seal Oil dP has been restored and during the transient Main Generator Hydrogen pressure dropped below 73psig.
Which detailed guidance will restore Hydrogen pressure?
SOP From A-301 Step 3 RNO
Stator Water Cooling
(Step 5)
Not pictured:
(5) No Pump running but available: start Stator Cooling Water Pump
(6) No pump available: Trip Turbine, Go To 207
Stator Cooling Water Pressure
(Step 6)
Stator Cooling Water Temperature
NOT?
RNO control method and target?
Turbine Trip Trigger?
(Step 7)
Check Temperature <125.6°F
Operate TCS-V009 Stator Cooling TCV to maintain 122°F
Cannot be maintained <194°F, Trip Go To A-207
TCS Pump Casualties within A-301
Requirement to start TCS Pump? (Surge Tank Level)
What if NO pump can be started?
(Step 8)
TCS Surge Tank Level must be >68.5”
No Pump can be started:
Go TO A-209 Loss of TCS
Hydrogen Gas Cooler Temperature
NOT?
RNO control method and target?
Turbine Trip Trigger? (Trick)
(Step 9)
Check <126°F
Operate TCS -V015 Gen. H2 Coolers Outlet TCV to maintain <126°F
No Trip, Reduce Load per A-101
Degrading Reactive Load Actions
Grid disturbance?
Methods to adjust MVAR?
If unable to use Reactive load to restore within Curve?
Grid disturbance: GO TO A-304
Adjust using AQR 57 or 55 controller, if AQR fails use 90R
Cannot Restore MVAR: Manual Runback 250MW/min
Trip and Go To A-207
Not pictured:
e. Manual Runback 250MW/min
f. MVARs outside limit: Trip Turbine, Go To 207
Trip Turbine and Purge
(Step 12 Only enacted if NO Seal Oil Pump running)
