L-1

Question 1

What temperature of RCS should one RCP always be running?

Why?

Answer 1

160 deg F

ensures uniform temperture distribution

Question 2

In Modes 4 (350-200 deg) and 5 (<200 deg) what is the required position of 8701 and 8702?

why?

Answer 2

at least one breaker must be closed

allows valves to be closed quickly if a LOCA outside of containment occurs

also allows isolation if pressure rises quickly that could damage RHR system????

Question 3

When starting the first RCP for heatup what limitations apply?

Why?

Answer 3

When - T_c < 273 deg F the an RCP must not be started unless:

• L_pzr < 50% OR
• T _s/g < 50 deg above each Tc

the concern is having an cold overpressurization condition caused by a heatup with no surge volume (273 = cold, high L_pzr = no surge volume, T _s/g a lot higher than RCS = when RCP starts S/G heats up RCS and causes RCS to expand)

Question 4

Per OP L-1, Before withdrawing SD banks what should/ shall be accomplished?

Answer 4

all four RCP’s should be in service

T_avg shall be above 541 deg F