Term
Air/N2
Describe the power supplies to the compressors and effects on loss/return of power. |
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Definition
-15 compressor is LC-103.
-Load shed on loss of power, does not return.
-16 compressor is LC-107.
-Not load shedded but does not restart.
-17 compressor is LC-108.
-Not load shed, will restart upon return of power. |
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Term
Air/N2
Describe the instrument N2 to instrument service air auto transfer. |
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Definition
-Will auto transfer to air if get to 110# high or to 99# low.
-Normal band is 102# - 107#. |
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Term
Air/N2
Describe applicable pressure functions. |
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Definition
-90#: Auto reset and reopening of non-essential instrument air isolation valves.
-85#: Instrument low pressure alarm.
-82#: Service air header low pressure and service air isolation valve closes (reopens at 95#).
-80#: Non essential instrument air isolation.
-75#: FRV lockup and low flow valve fails open.
-60#: Scram air header low pressure, rods drift in (SCRAM).
-50#: MSIVs drift close.
-45#: SCTMT isolation dampers in Rx building start to shut.
-15#: HVAC units shut down due to loss of damper control air. |
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Term
Air/N2
Describe the receiver relief setpoint. |
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Definition
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Term
Air/N2
Describe what Alt N2 supplies. |
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Definition
-A train: B/U supply to t-ring seals, TORUS vacuum breakers, and 3 SRVs.
-B train: B/U supply to t-ring seals, inboard MSIV actuators, 3 SRVs, and hard pipe vent isolation valves and rupture discs. |
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Term
Air/N2
Describe the normal pressure for Alt N2. |
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Definition
-Normally 95-97 psig.
-Alarm at 91 psig. |
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Term
Air/N2
Describe the Alt N2 pressure requirements. |
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Definition
-Required to be > than 410psig.
-Alarm at 200 psig and system isolates itself. |
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