Systems Exam 2 - Core Cooling Monitor & RVLIS Flashcards
(12 cards)
RVLIS TS light requirements
TS requires 4 lights per train with min of 1 in the head and 3 in the core to be operable
RVLIS Light Setpoints
→if thermocouple ΔT >200°F, then light goes out
→if thermocouple ΔT <100°F, then light is on
CCM Operability
Tech Spec 3.3.3 requires 2 operable CETs per Train, per Quadrant (16 total)
→verify at least 2 Train A & B CETs per quadrant available with < 75° F difference
→in addition, 5 CETs per train operable (at least on CET per quadrant and one additional CET in the center of the core that is different from the first four)
How does the CCM Subcooled Margin Monitor (SMM) calculate Saturation Margin?
→Using the auctioneered hi temperature and auctioneered low pressure it calculates Saturation Margin
→(u-TI-3611-1) uses auctioneered Hi Temperature (Failed TCs are removed from scan)
→range: 300° F above to 300° F below saturation temp
CCM SMM Train A Inputs
→25 CETs (auctioneered highest)
→T-hot Loops 1&2
→T-cold Loops 3&4
→PZR NR Pressure PT-0455
→PAM WR Pressure Thimble Pressure PT-3613 (loop pressure)
CCM SMM Train B Inputs
→25 CETs (auctioneered highest)
→T-hot Loops 3&4
→T-cold Loops 1&2
→PZR NR Pressure PT-0458
→PAM WR Pressure PT-403 (loop pressure)
How does CCM utilize data from CETs?
The highest valid CET signal is used and displayed.
With subcooling less than 25°F and less than 11” level above the core plate and core exit thermocouples greater than 750°F…
actions to restore core cooling capability are required.
Shutdown Margin Monitor Inputs (4)
- Highest CET
- RCS Loop RTD temperatures
- RCS Loop pressures
- PZR pressure
What are the power supplies for CCM & RVLIS?
→Train A/B CCM powered from uEC5/uEC6
→Train A/B RVLIS powered from uEC5/uEC6
What are the power supplies for the CCM alarms?
Unit 1:
→Train A: XED1-1
→Train B: XED2-1
Unit 2:
→Train A: 2ED1-1
→Train B: 2ED2-1
