Q48 — Control Room Evacuation
G2.4.11 (4.0)
Given:
• Unit 2 is at 100% Reactor Power and stable
At time 02:00:00
• 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?
S2.OP-AB.CR-0001 (Control Room Evacuation) is implemented when the Control Room is evacuated as the result of a(n) _(1)_.
If Control Room conditions permit, the crew _(2)_ INITIATE a Main Steam Isolation prior to evacuating the Control Room.
• Unit 2 is at 100% Reactor Power and stable
At time 02:00:00
• 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?
S2.OP-AB.CR-0001 (Control Room Evacuation) is implemented when the Control Room is evacuated as the result of a(n) _(1)_.
If Control Room conditions permit, the crew _(2)_ INITIATE a Main Steam Isolation prior to evacuating the Control Room.
A. (1) security event (2) will
B. (1) security event (2) will NOT
C. (1) uncontrolled fire in the Control Room (2) will
D. (1) uncontrolled fire in the Control Room (2) will NOT
▶ Show Answer & Explanation
✓ A. Correct. For Part 1, S2.OP-AB.CR-0001 (Control Room Evacuation) is implemented when the Control Room is evacuated as the result of a security event. For Part 2 and IAW S2.OP-AB.CR-0001, the crew will initiate a Main Steam Isolation as part of the immediate actions.
✗ B. Part 1 is correct. For Part 2, EOP-TRIP-1 only requires initiating a Main Steam Line Isolation if the turbine can not be tripped. Since the Turbine was successfully tripped, the candidate could incorrectly conclude that initiating a Main Steam isolation is not required per S2.OP-AB.CR-0001.
✗ C. For Part 1, there is another Abnormal Procedure that deals with a control room evacuation due to a fire. Consequently, the candidate could incorrectly conclude that S2.OP-AB.CR-0001 (Control Room Evacuation) is implemented when the Control Room is evacuated as the result of an uncontrolled fire in the control room. Part 2 is correct.
✗ D. For Part 1, there is another Abnormal Procedure that deals with a control room evacuation due to a fire. Consequently, the candidate could incorrectly conclude that S2.OP-AB.CR-0001 (Control Room Evacuation) is implemented when the Control Room is evacuated as the result of an uncontrolled fire in the control room. For Part 2, EOP-TRIP-1 only requires initiating a Main Steam Line Isolation if the turbine can not be tripped. Since the Turbine was successfully tripped, the candidate could incorrectly conclude that initiating a Main Steam isolation is not required per S2.OP-AB.CR-0001.
Ref: S2.OP-AB.CR-0001 | LO: NOS05ABCR01-05 (Control Room Evacuation) | Source: Modified Bank (ILOT 1601 AUDIT RO 069) | Cognitive: Lower
Connections
- Related systems: Main Steam
- Related procedures: AB.CR-0001 — Control Room Evacuation
- Related EOPs: EOP-TRIP-1 — Reactor Trip or Safety Injection
- Related exam: 2019 NRC Written Exam