AOP-31 "Spurious Containment Isolation"

Question 1

AOP-31 entry conditions

Answer 1

EK-1126 “CIS Initiated” with Containment pressure and radiation levels normal

Question 2

AOP-31 automatic actions

Answer 2

• Containment Isolation Valves close
• Safety Injection initiated (CHP only)
• Containment Spray initiated (CHP only)
• Reactor Trip (CHP only)

Question 3

AOP-31 reactor trip criteria

Answer 3

Containment Isolation caused by CHP

Question 4

AOP-31 immediate actions

Answer 4

Verify Containment Isolation caused by CHP, ensure the reactor is tripped, and go to EOP-1