Steam Generating/SGWLC/Blowdown Flashcards
What do the J tubes help to prevent?
- Water Hammer when AFW initiates
What does the flow restrictor do on each MS outlet from the SG?
- Provide plant protection, in case of MSLB, by decreasing steam flow rate to reduce RCS cooling rate.
What is P-14 permissive?
- SG Hi HI Lvl at 67% on 1 SG (2/3)
What will P-14 permissive cause?
- Turbine Trip
- MFP Trip
- FWI
What enables AMSAC?
- > 40% Power (C-20, 2/2 Turbine first stage Impulse #)
What causes an AMSAC signal?
- FW flow < 25% (3/4 Feed flow)
What will AMSAC actuate?
- All 3 AFW Pumps
- Trips Main Turbine (30 Sec)
What does SG blowdown do for the SG?
- Drain SG water from chemical and impurity sludge formation area to maintain SG chemistry & prevent sludge corrosive attack
When do DCR-310-340 (BD isolation valves) automatically isolate?
- Phase A
- High Rad: R-19 (Sampling)
- High Rad: R-24 (Treatmnt)
- High Level in Flash Tank
- AFW Flow Conservation (MDAFP starts)
- TDAFP Start
Where is the normal BD tank vented to?
- Condenser A
Where do we drain both flash tanks to?
- TRS Overflow via DRV-350
Can the high rad trip on the BD system valves isolating be overridden?
- Yes, they can. Can be overridden in sample room
When do BD sample isolation valves (DCR-301-304) automatically close?
- High Rad
- Phase A
What actuations does a high rad signal from R-19 cause? ***
- Closes BD Isolation DCRs 310-340
- Closes DRV-350 SGBD Flashtank to TRS
- Closes BD Sampling DCRs 301-304
- Override available
What actuations does a high rad signal from R-24 cause?
- Trips SGBD Treatment Pump
- Closes BD Isolation DCRs 310-340
- Closes DRV-350 SGBD Flashtank to TRS
- Closes BD Sampling DCRs 301-304
- Override available
Control air header pressure is lowering at a fast rate. At 80 psi, the reactor is manually tripped, and header pressure continues to lower. What will happen to the air reg valves in the BD system if pressure continues to lower?
- All air reg valves on BD system will isolate on loss of ctrl air
- DRV-350/352
- BD isolation valves
- BD Flow Ctrl Valves
- BD Sample Valves
What will cause a AFW Flow Conservation?
- Both MFP Trips
- AMSAC
- Low-Low SG lvl
- Load Shed
- SI
What is the cooling water to the BD Hx and flash tank quenching?
- CHW
What supplies cooling to the sample Hx?
- CCW
What does SGWLC maintain?
- SGWLC maintains SG Narrow Range level at 43.8% for all power levels.
What plant protection functions do the SG # transmitters provide?
- SG Steam Line Break Detection
- SI Initiation
- Main Steam Line Isolation
- Low Steam # Alarms
What is the dominant control for SG Level? ***
- Level Dominant (43.8%)
- Steam Generator Level overrides Feed flow/Steam Flow mismatch over time, level is a lag signal*
What causes a Steam Line Isolation (SLI)? ***
- Cnt # High-High at 2.8# (2/4)
- SG # low < 500# (1/1 on 2/4 SG)
- High Stm flow with P-12 (1.42E6/1.6E6) (1/2) on 2 SG
What is the definition of density compensation?
- converts volumetric flow rate of steam to mass flow rate for input into SGWLC circuit. (Left 2 Channels ctrl SG lvl)
