Q71 — CR Evacuation AFW / PZR Pressure
APE: 068 Control Room Evacuation-AA2.06 (4.1)
Given:
• Unit 2 is at 100% Reactor Power and stable
At time 15:00:00
• The crew enters S2.OP-AB.CR-0001 (Control Room Evacuation)
• The Reactor Trip has been confirmed
• The Turbine has been successfully tripped
In accordance with S2.OP-AB.CR-0001, which ONE of the following completes the statements below?
If Control Room conditions permit, the crew will _(1)_ until total flow drops to 22E04 LB/HR.
After the Control Room has been evacuated and in accordance with S2.OP-AB.CR-0001 Attachment 6 (Plant Operator), RCS pressure will be maintained by cycling PZR Heaters _(2)_.
• Unit 2 is at 100% Reactor Power and stable
At time 15:00:00
• The crew enters S2.OP-AB.CR-0001 (Control Room Evacuation)
• The Reactor Trip has been confirmed
• The Turbine has been successfully tripped
In accordance with S2.OP-AB.CR-0001, which ONE of the following completes the statements below?
If Control Room conditions permit, the crew will _(1)_ until total flow drops to 22E04 LB/HR.
After the Control Room has been evacuated and in accordance with S2.OP-AB.CR-0001 Attachment 6 (Plant Operator), RCS pressure will be maintained by cycling PZR Heaters _(2)_.
A. (1) LOWER 23 AFW Pump speed (2) and PZR Spray Valves
B. (1) LOWER 23 AFW Pump speed (2) ONLY
C. (1) THROTTLE 21 and 22 AFW Pump Steam Generator Inlet Valves (2) and PZR Spray Valves
D. (1) THROTTLE 21 and 22 AFW Pump Steam Generator Inlet Valves (2) ONLY
▶ Show Answer & Explanation
✓ B. Correct. IAW S2.OP-AB.CR-0001 Immediate Actions, if Control Room conditions permit, the crew will LOWER 23 AFW Pump speed until total flow drops to 22E04 LB/HR.
✗ A. Part 1 is correct. For Part 2, PZR Heaters and Spray are the normal methods to maintain RCS pressure. Consequently, the candidate could incorrectly conclude that after the control room has been evacuated that RCS pressure will be maintained by cycling PZR Heaters and PZR Spray Valves.
✗ C. For Part 1, ALL of the AFW pumps will automatically start following a Reactor Trip from 100% Power. Consequently, the candidate could incorrectly conclude that the crew will throttle AFW flow from the MDAFW Pumps (21 and 22 AFW Pumps). For Part 2, PZR Heaters and Spray are the normal methods to maintain RCS pressure. Consequently, the candidate could incorrectly conclude that after the control room has been evacuated that RCS pressure will be maintained by cycling PZR Heaters and PZR Spray Valves.
✗ D. For Part 1, ALL of the AFW pumps will automatically start following a Reactor Trip from 100% Power. Consequently, the candidate could incorrectly conclude that the crew will throttle AFW flow from the MDAFW Pumps (21 and 22 AFW Pumps). Part 2 is correct.
Ref: S2.OP-AB.CR-0001 (Control Room Evacuation) | LO: NOS05ABCR01-05 | Source: New | Cognitive: Lower
Connections
- Related systems: AFW, Pressurizer & PRT
- Related procedures: AB.CR-0001 — Control Room Evacuation
- Related exam: 2019 NRC Written Exam