Systems Exam 2 - Core Cooling Monitor & RVLIS

Question 1

RVLIS TS light requirements

Answer 1

TS requires 4 lights per train with min of 1 in the head and 3 in the core to be operable

Question 2

RVLIS Light Setpoints

Answer 2

→ >200°F then light goes out
→if < 100°F then light is on, once temperature goes above ~1000°F the light will come back on

Question 3

CCM Operability

Answer 3

TS requires 2 operable CETs/Train/Quadrant (16 total)

Question 4

How does the Subcooled Margin Monitor (SMM) calculate Saturation Margin?

Answer 4

→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)

Question 5

SMM Train A

Answer 5

CET A
Th Loops 1&2
Tc Loops 3&4
Ppzr 455
Thimble 3613

Question 6

SMM Train B

Answer 6

CET B
Th Loops 3&4
Tc Loops 1&2
Ppzr 458
WR PtT-403

Question 7

How does CCM utilize data from CETs?

Answer 7

The highest valid CET signal is used and displayed.

Question 8

With subcooling less than 25°F and less than 11” level above the core plate and core exit thermocouples greater than 750°F…

Answer 8

actions to restore core cooling capability are required.

Question 9

Shutdown Margin Monitor Inputs (4)

Answer 9

1. Highest CET
2. RCS Loop RTD temperatures
3. RCS Loop pressures
4. PZR pressure