Term
HPCI
Describe the function of HPCI. |
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Definition
-HPCI is designed to be at rated flow within 25 seconds of an initiation signal.
-The accident analyses assume that HPCI is at rated flow within 45 seconds of an initiation signal. |
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Term
HPCI
Describe the HPCI initiation signals. |
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Definition
-Rx low low water level: -47".
-High drywell pressure: 1.84psig. |
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Term
HPCI
Describe what happens on HPCI auto initiation. |
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Definition
-Aux oil pump starts.
-Gland seal blower starts.
-Steam isolation outboard valve (MO-2035) opens.
-Steam supply to turbine valve (MO-2036) opens.
-Pump supply to Rx valves (MO-2067/2068) open.
-Minimum flow valve (CV-2065) opens allowing minimum flow to TORUS.
-Hydraulic stop (HO-7) and governor valve (HO-8 from ramp generator) open.
-Test return to CST valve (MO-2071) shuts.
-Test return to CST drag valve (CV-3503) shuts.
-Steam trap isolations to main condenser (CV-2046A/2046B) shut.
-Condensate discharge to CRW valves (CV-2398A/2398B) shut aligning flow to suction of booster pump. |
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Term
| HPCI Describe the HPCI suction auto transfer. |
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Definition
| -If CSTs reach 2'8" automatically opens TORUS suction valves (MO-2061/2062) and when full open shut CST suction valve (MO-2063). -Same thing happens if TORUS level reaches +2". |
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Term
HPCI
Describe the HPCI trips (group IV). |
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Definition
-Low steam pressure: 100psig.
-High steam line area temp: 187.5F.
-High steam flow: 300,000lbm/hr for 4 seconds. |
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Term
HPCI
Describe the HPCI trips. |
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Definition
-On a trip it will close the turbine stop valve (HO-7).
-Turbine overspeed: 5000rpm (resets after 4 to 6 seconds).
-High Rx water level: +48" (resets at -47").
-Turbine high exhaust pressure: 150psig (resets at 90psig).
-Pump suction low pressure: 16.5" Hg (resets at 10" Hg).
-Manual push button on C-03. |
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Term
HPCI
Describe the turbine minimum speed and why. |
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Definition
-Turbine kept above 2150rpm.
-Done to prevent water hammer from check valve cycling. |
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Term
HPCI
Describe the test return valve (MO-2071 & CV-3503) interlocks. |
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Definition
| If either TORUS suction valve (MO-2061/2062 is open then the test return valves will shut. |
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Term
HPCI
Describe the operation of the aux oil pump. |
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Definition
-Will start on initiation (-47"/1.84#).
-Will trip when oil pressure reaches 90psig.
-Then gear driven pump takes over.
-Will restart when oil pressure reaches 35psig. |
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Term
HPCI
Describe limitations in using HPCI for level/pressure control. |
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Definition
| Cannot do pressure/level control with suction aligned to the TORUS. |
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Term
HPCI
Describe the affect on HPCI valves on a loss of Div II 125Vdc. |
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Definition
| All HPCI suction valves open with a loss of Div II 125Vdc. |
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Term
HPCI
Describe the power supplies to HPCI. |
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Definition
-HPCI power: Div II 250Vdc #16 battery.
-250Vdc = MCC-312.
-125Vdc = D-100/21.
-Only AC power is inboard steam isolation valve (MO-2034) from MCC-143A.
-Instrumentation = Y-20/80. |
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