PAM

Question 1

State why RCS wide-range pressure monitors are located outside containment

Answer 1

This minimizes inaccuracies that could result from a high temperature environment

Question 2

State what RCS wide-range pressure provides

Answer 2

RVLIS density compensation
LTOP
RHR suction valve interlock

Question 3

State 3 main functions of RVLIS

Answer 3

Detects the presence of a gas or steam void in the vessel (RCPs off)
Assists in detecting an approach to inadequate core cooling
Indicates void fraction in the RCS during forced flow conditions

Question 4

Discuss Dynamic/Full Range RVLIS indication full power to zero power

Answer 4

DYNAMIC:
110% at full power all RCPs on
100% at zero power all RCPs on
FULL RANGE:
108% No RCPs running
>120% 4 RCPs Running

Question 5

State why temperature compensation of the RVLIS differential pressure signals is necessary

Answer 5

Maintains accuracy in harsh environment

Question 6

State the two functions of hydraulic isolators used in RVLIS

Answer 6

Provides containment isolation

Provides feedback to RVLIS cabinet to ignore transmitter if over ranged

Question 7

Discuss how subcooling readout is generated

Answer 7

Auctioneered high quadrant average CET with WR pressure

Tsat from WR RCS pressure (PT-405 and PT-403)

Question 8

Discuss HELB, purpose and actuations

Answer 8

HELB mitigates harsh environment

Isolates (SB, AS, Letdown)