Q19 — EOP-TRIP-2 / Inadequate Rapid Boration Flow
APE 24 AA2.12 (3.5)
Given:
• Unit 2 reactor trip, crew in EOP-TRIP-2
• 3 control rods not fully inserted
• Rapid boration via BAT pump
• 2CV175 fully open
• Flowmeter reads 20 gpm
What is the required action?
• Unit 2 reactor trip, crew in EOP-TRIP-2
• 3 control rods not fully inserted
• Rapid boration via BAT pump
• 2CV175 fully open
• Flowmeter reads 20 gpm
What is the required action?
A. Continue rapid boration until required boron achieved
B. Stop BAT pump, realign charging suction to RWST, maintain charging >87 gpm
C. Establish rapid boration via cold leg injection from RWST and BIT valves
D. Locally open 2CV174 to bypass blender, open 2CV172 for max boron, maintain charging >87 gpm
▶ Show Answer & Explanation
✓ B. Correct. Per EOP-TRIP-2 step 4, adequate rapid boration flow through 2CV175 is 36 gpm. Indicated 20 gpm is inadequate. EOP-TRIP-2 directs: stop BAT pump, realign charging suction from RWST, and maintain charging flow greater than 87 gpm.
✗ A. Rapid boration flow should be 36 gpm; 20 gpm is inadequate. Continuing with inadequate flow does not meet the procedure requirements.
✗ C. This action is from EOP-FRSM-1 (subcriticality response), not EOP-TRIP-2.
✗ D. This action is for emergency borating from the field during control room evacuation, not EOP-TRIP-2.
Ref: 2-EOP-TRIP-2 (R41) | LO: NOS05TRP002-08, Obj 5 | Source: Bank - Byron 2019 NRC RO21 | Cognitive: Comprehension/Analysis
Connections
- Related systems: CVCS
- Related procedures: EOP-TRIP-2 — Reactor Trip Response
- Related exam: 2023 NRC Written Exam