Q99 — CR Evacuation SI Defeat
G2.4.35 (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)
At time 02:01:00
• The Control Room has been evacuated and ALL of the Immediate Actions of S2.OP-AB.CR-0001 were successfully completed
• There is NO damage to the plant
In accordance with S2.OP-AB.CR-0001, which ONE of the following completes the statements below?
The SM will direct Safety Injection to be defeated by ___
• 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)
At time 02:01:00
• The Control Room has been evacuated and ALL of the Immediate Actions of S2.OP-AB.CR-0001 were successfully completed
• There is NO damage to the plant
In accordance with S2.OP-AB.CR-0001, which ONE of the following completes the statements below?
The SM will direct Safety Injection to be defeated by ___
A. inserting a jumper to P-11 and, before leaving the control room, placing SEC Block switches in Block per S2.OP-AB.CR-0001 Attachment 5 (REACTOR OPERATOR)
B. opening vital instrument bus breakers to de-energize SSPS and the SEC cabinets per S2.OP-AB.CR-0001 Attachment 7 (#1 NEO)
C. inserting a jumper for P-11 and opening vital instrument bus breakers to de-energize SECs S2.OP-AB.CR-0001 Attachment 5 (REACTOR OPERATOR)
D. opening vital instrument bus breakers to de-energize SSPS and before leaving the control room, placing the SEC Block switches in Block per S2.OP-AB.CR-0001 Attachment 7 (#1 NEO)
▶ Show Answer & Explanation
✓ B. Correct. The SM will direct Safety Injection to be defeated by opening vital instrument bus breakers to de-energize SSPS and the SEC cabinets per S2.OP-AB.CR-0001 Attachment 7 (#1 NEO).
✗ A. Incorrect but plausible. The RO would normally operate the SEC block switches from the control room and blocking the SECs would defeat Safety Injection.
✗ C. Incorrect but plausible. This distractor is partially correct.
✗ D. Incorrect but plausible. This distractor is partially correct.
Ref: S2.OP-AB.CR-0001 (Control Room Evacuation) | LO: NOS05ABCR01-05 (CONTROL ROOM EVACUATION) | Source: New | Cognitive: Lower
Connections
- Related procedures: AB.CR-0001 — Control Room Evacuation
- Related systems: RPS/SSPS, SECs
- Related exam: 2019 NRC Written Exam