AOP-22 "PZR Level Control Malfunctions"

Question 1

AOP-22 entry conditions

Answer 1

• EK-0735 “Charging Low Flow”
• EK-0761 “Pressurizer Level HI-LO”
• EK-0763 “Pressurizer Level Channel “A” LO-LO”
• EK-0764 “Pressurizer Level Channel “B” LO-LO”
• EK-0769 “Pressurizer High Level”
• Loss of level control program output signal causing a deviation from the calculated level control setpoint

Question 2

AOP-22 automatic actions

Answer 2

• PZR High Level - max letdown, min charging, and PZR Backup Heaters energize (in auto position only)
• PZR Low Level - min letdown, max charging
• PZR Low-Low Level - all PZR Heaters trip, CV-2003, Letdown Orifice Stop Valve, closes

Question 3

AOP-22 reactor trip criteria

Answer 3

PZR Level < 30%

Question 4

AOP-22 immediate actions

Answer 4

NONE