RVLIS & RVLRIS

Question 1

Purpose of RVLIS

How does work(ranges)

Answer 1

Provide indication of Rx vessel level during accident conditions

Takes various pressure and temperatures to develop head based on water height and steam water mixtures interactions to provide density compensated level

Upper(loops-top) , full(all) , dynamic (RCP on void content)

Question 2

Subcooling Margin Monitor
Inputs……?
How work…..?

Answer 2

-Takes hottest temp (hottest T/C…..or Th1-4)
-Compares lowest wide range Press (PT-405/403)
Determines subcooling
Train B on VB-2
Lo- alarm disabled > P-10 (30 deg)
Lo-Lo alarm (20 deg)

Question 3

Inputs to RVLIS

Answer 3

Wide rang Th(413A,423A,433A,443A)
Wide range Press(PT-403,405)
Dynamic range d/p
Full range d/p
Upper range d/p
RCP status 
T/C
Sensing line fluid temp(density comp)

Question 4

How is RCS contained without CIV’s w/respect to RVLIS?

Answer 4

Inside CNMT uses sensor bellows & check valves (RCS on one side of bellows, did water on other side, if break happens, check valve will isolate)
Outside CNMT uses hydraulic isolators
(Capillary fluid separated by bellows and deflection Rod sends signal if excess deviation)

Question 5

Purpose of RVRLIS

Consists of….

Answer 5

Provide indication of vessel level during refueling

WR level, NR level, visual level, ultrasonic level

Question 6

Precautions & limitations of RVRLIS?

Answer 6

LI-400 shall remain in service Lpzr < 25% cold cal—->Lpzr > 50%

Rapid changes in level can cause unequal pressures created in gas spaces in RCS due to restrictions in cross tie lines

Question 7

What lvl in RVLIS indicates top of core?

Top of loops?

Answer 7

57%

70%