Term
Con Sto
Describe the purpose of condensate storage. |
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Definition
-To assure that an adequate quantity of reactor-quality water is available for refueling and normal plant operations.
-Up to 460,000 gallons for:
-Hotwell makeup and reject.
-Control Rod Drive supply.
-Fuel Pool storage makeup.
-Demineralizer and radwaste processing.
-Filling the refueling wells.
-Misc plant flushing and decontamination.
-Pressurizing RHR and CS piping. |
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Term
Con Sto
Describe the condensate storage tanks and overflow tank. |
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Definition
-2 stowage tanks rated at 230,000 gal each.
-9,400 gal/ft.
-Maintained at 100F.
-1 overflow tank rated at 500 gallons.
-Stowage tanks vented to recombiner and overflow tank, overflow tank vented to atmosphere. |
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Term
Con Sto
Describe the condensate service pumps and jockey pump. |
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Definition
-2 cond serv pumps rated at 800gpm each.
-Jockey pump rated at 75gpm.
-#11 pump powered by MCC-111.
-#12 pump powered by MCC-141.
-Jockey pump powered by MCC-141. |
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Term
Con Sto
Describe temperature control of CST's and why. |
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Definition
-CSTs located outside.
-Heat trace system (electricity) through CSTs to maintain temperature roughly 100F.
-Powered by L-18.
-Done to prevent thermal shock to feedwater nozzles during auto-initiation of HPCI and RCIC. |
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Term
Con Sto
Describe the level setpoints in the CSTs. |
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Definition
-Top of tank: 25'.
-Over flow: 24'6".
-High level alarm: 24'.
-Low level alarm: 11'6".
-Low-low level alarm: 7'.
-HPCI/RCIC operability level: 6'8".
-HPCI/RCIC auto Xfer to TORUS: 2'8".
-Overflow tank low" 88gal/500gal (1'3"). |
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Term
Con Sto
Describe what happens on a CST low-low level alarm. |
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Definition
-Secures both cond pumps.
-Secures jockey pump.
-Shuts the hotwell makeup valves. |
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Term
Con Sto
Describe where the overflow tank drains. |
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Definition
| Reactor building equipment drain sump. |
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Term
Con Sto
Describe when a cond pump auto starts. |
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Definition
-Low header pressure < 95#.
-F/d backwash started. |
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Term
Con Sto
Describe the operation of the cond pumps. |
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Definition
-Operated from C-80 and C-96.
-If both in AUTO: lead pump auto starts.
-If both in RUN: Neither pump will run.
-If either in STOP: Neither pump will run.
-If 1 in AUTO and 1 in RUN: lead pump runs continuously. |
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Term
Con Sto
Describe the AOVs in Con Sto. |
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Definition
-1 AOV (AO-2886) is isolation for pressurizing station supply line.
-Auto open if shut @ <95#.
-Fails closed on loss of air.
-2nd AOV (CV-1378) sets F/D backwash line pressure at 60#. |
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Term
Con Sto
Describe the Con Sto heat exchanger. |
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Definition
-Designed to maintain CSTs warm.
-Not normally used due to increased CRD return flow.
-Can be placed in service if shutdown in winter. |
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Term
Con Sto
Describe the Con Sto low temperature alarm setpoint. |
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Definition
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Term
Con Sto
Describe the Con Sto system low pressure alarm. |
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Definition
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Term
Con Sto
Describe Con Sto keepfill. |
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Definition
-Keep 30psi on CS pump discharge and 40psi on RHR Hx outlet.
-Careful on bypassing pressurizing stations as teh PCV stem can easily by bent.
-Drops pressure from 150# to 20# at pressurizing stations.
-Bypassing a pressure control valve can cause flow to the vessel through SDC loop if SDC pressure is < condensate service pressure. |
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Term
Con Sto
Describe the low level bypass. |
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Definition
| -Can bypass the low level pump trip (7') when filling Rx cavity during an outage. |
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