Term
SW Nuclear Header
Purpose |
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Definition
Ultimate Heat Sink for heat loads in the Aux Building and Containment.
1. Operation during: Startup, normal operation, shutdown, and accident conditions
2. Provide supply under all credible seismic, flood, storm and drought conditions
3. Proper operation directly supports nuclear safety
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Term
SW Nuclear Header
Design Basis |
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Definition
1. Designed to transfer heat loads from the reactor safeguards and nuclear auxiliary equipment to the ultimate heat sink during Normal and Accident conditions.
2. Safeguard system consists of 2 independent, full sized headers, each supplied by a group of 3 pumps for each unit.
3. 2 operable loops are required to meet Tech Specs |
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Term
| What system does SW provide an emergency backup source? |
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Definition
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Term
| Which CFCU can be fed from either Nuclear header? |
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Definition
| 23CFCU can be fed from either header via the 21SW53 or 22SW53 check valves. |
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Term
Name the CFCUs fed from 21 Nuclear header...
Name the CFCUs fed from 22 Nuclear header... |
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Definition
21 NH= 21CFCU thru 21SW54
21 NH= 22CFCU thru 22SW54
22 NH= 24CFCU thru 24SW54
22 NH= 25CFCU thru 25SW54
21NH or 22NH= 23CFCU thru 23SW54 |
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Term
EDGs are cooled by SW through which valves and what are their modes of operation?
What nuclear header supplies the EDGs? |
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Definition
SW39 Inlet and SW42 Outlet
SW39 opens upon EDG start and closes on Stop.
SW42 DP control valve maintains 190" or 750gpm
Valves designed to Fail open upon loss of air.
EDGs can be fed from either 21SW or 22SW Header |
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Term
| Name the SW inlet and outlet isolation valves for the CFCUs and their modes of operation. |
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Definition
SW58 Inlet
SW72 Outlet
Designed to Fail open upon loss of control air
Designed to Fail close upon loss of 125VDC |
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Term
| CFCU Modes of operation include... |
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Definition
Normal operation: 2-3 CFCUs I/S Fan in Hi Speed
Accident operation: 5 CFCUs I/S Fan in Low speed
SW fixed flow of 1465gpm
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Term
| During mode III Accident LOCA + LOOP, What is the expected operation of the CFCUs? |
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Definition
| Loads stripped from their buses and reloaded within 33-37 Seconds. |
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Term
SW Accumulator
Purpose and operation |
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Definition
2 pressurized SW Accumulators per unit.
Designed to deliver 30gpm at 253' of head
Pressurized (144-150 psi) with nitrogen (N2) to force water through the CFCUs during an UV actuation from at least 1 out of 2 relays on 2 4KV buses.
Each accumulator has its own fill pump
capacity of 15,000g, filled with 10,000g of SW
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Term
| State the normal SW line up for the 21, 22, and 23 chillers. |
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Definition
21 and 22 are normally feed from SW22 NH
23 chiller and #2 ECAC are normally fed from SW21 NH |
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Term
| Which system place the largest load on the SW Nuclear headers? |
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Definition
21/22 Component Cooling Heat Exchangers
SW Flow of 10,000 gpm Max
Design Pressure/Temp: 150psi/200F |
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Term
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Definition
Fed from 2SW26 to 2ST1
2ST1 feeds: 21/22 TAC HX
21/22 MTLO Coolers
21 A/B SGFP LO Coolers
22 A/B SGFP LO Coolers
SACs |
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Term
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Definition
| Modulates to reduce SW pressure to 80 PSI prior to entering the turbine area coolers and heat exchangers. |
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Term
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Definition
| Located downstream of the TGA Cooler temp control valves, used to maintain 50 PSI back pressure on the discharge header |
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Term
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Definition
Offers over pressure protection to the MTLO and Turbine Oil Coolers.
Opens @ 125 PSI |
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Term
| What system is the largest load on the TGA Header? |
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Definition
| 21/22 TAC HX @ 10,000 gpm |
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Term
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Definition
ST Header Bypass Valve
Protects the TAC HX from over pressure
Opens @130 PSI |
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