Q67 — Control Room Evacuation Emergency Boration and CV55 Location
APE: 024 Emergency Boration-G2.4.34 (4.2)
Given:
• The Unit 2 Control Room has been evacuated in accordance with S2.OP-AB.CR-0001 (Control Room Evacuation)
• The Reactor Trip has been confirmed but 2 Control Rods did not fully insert into the core
At time 08:00:00
• The RO and PO are preparing to perform an Emergency Boration in accordance with S2.OP-AB.CR-0001 Attachment 5 (Reactor Operator) and Attachment 6 (Plant Operator)
Which ONE of the following completes the statements below?
In accordance with S2.OP-AB.CR-0001 Attachment 6, the crew will perform the Emergency Boration for a duration of _(1)_ minutes.
During the Emergency Boration, the RO will throttle 2CV55 (Cent Chg Pmp Flow Cont Valve) by adjusting the 2CV55 Manual HAND/AIR Regulator Controller located at Panel _(2)_.
NOTE:
• Panel 213-2 = Unit 2 Hot Shutdown Panel
• Panel 216-2 = Unit 2 Chg Pmps FL & PR Inst Panel
• The Unit 2 Control Room has been evacuated in accordance with S2.OP-AB.CR-0001 (Control Room Evacuation)
• The Reactor Trip has been confirmed but 2 Control Rods did not fully insert into the core
At time 08:00:00
• The RO and PO are preparing to perform an Emergency Boration in accordance with S2.OP-AB.CR-0001 Attachment 5 (Reactor Operator) and Attachment 6 (Plant Operator)
Which ONE of the following completes the statements below?
In accordance with S2.OP-AB.CR-0001 Attachment 6, the crew will perform the Emergency Boration for a duration of _(1)_ minutes.
During the Emergency Boration, the RO will throttle 2CV55 (Cent Chg Pmp Flow Cont Valve) by adjusting the 2CV55 Manual HAND/AIR Regulator Controller located at Panel _(2)_.
NOTE:
• Panel 213-2 = Unit 2 Hot Shutdown Panel
• Panel 216-2 = Unit 2 Chg Pmps FL & PR Inst Panel
| (1) | (2) |
A. 70 / 213-2
B. 70 / 216-2
C. 240 / 213-2
D. 240 / 216-2
▶ Show Answer & Explanation
✓ B. Correct. For Part 1, IAW S2.OP-AB.CR-0001 Attachment 6, the crew is required to perform an Emergency Boration for a duration of 35 minutes per each stuck rod. Consequently, with 2 Control Rods stuck, the crew is required to perform an Emergency Boration for a duration of 70 minutes. For Part 2, the RO will throttle 2CV55 (Cent Chg Pmp Flow Cont Valve) by adjusting the 2CV55 Manual HAND/AIR Regulator Controller located at Panel 216-2.
✗ A. Incorrect but plausible. Part 1 is correct. For Part 2, the candidate could incorrectly conclude that Panel 216-2 only contains instrumentation readings and the 2CV55 Manual HAND/AIR Regulator Controller is actually located at the Hot Shutdown Panel.
✗ C. Incorrect but plausible. For Part 1, EOP-TRIP-2 also contains Emergency Boration guidelines. In EOP-TRIP-2, if the RWST is used as the source of the Emergency Boration, then the emergency boration duration will be 120 minutes for each stuck rod. Consequently, the candidate could incorrectly conclude that S2.OP-AB.CR-0001 Attachment 6 requires the emergency boration duration to be 120 minutes for each stuck rod (240 minutes total). For Part 2, the candidate could incorrectly conclude that Panel 216-2 only contains instrumentation readings and the 2CV55 Manual HAND/AIR Regulator Controller is actually located at the Hot Shutdown Panel.
✗ D. Incorrect but plausible. For Part 1, EOP-TRIP-2 also contains Emergency Boration guidelines. In EOP-TRIP-2, if the RWST is used as the source of the Emergency Boration, then the emergency boration duration will be 120 minutes for each stuck rod. Consequently, the candidate could incorrectly conclude that S2.OP-AB.CR-0001 Attachment 6 requires the emergency boration duration to be 120 minutes for each stuck rod (240 minutes total). Part 2 is correct.
Ref: S2.OP-AB.CR-0001 (Control Room Evacuation) | LO: NOS05ABCR01-05 — Describe, in general terms, the actions taken in S1/S2.OP-AB.CR-0002(Q) and the bases for the actions | Source: New | Cognitive: Higher
Connections
- Related systems: CVCS
- Related procedures: AB.CR-0001 — Control Room Evacuation
- Related exam: 2018 NRC Written Exam