Q21 — Rapid Boration per EOP-TRIP-2
000024AK2.03 (2.7)
Given:
• Following a Unit 2 Reactor Trip, the crew has transitioned to 2-EOP-TRIP-2, Reactor Trip Response.
• The crew is performing the Control Rod Insertion Step.
• Two Control Rods have failed to fully insert.
• 2CV175, RAPID BORATE STOP VALVE will NOT open.
Which of the following describes the valve manipulations required in accordance with 2-EOP-TRIP-2, Reactor Trip Response, to establish rapid boration.
• Following a Unit 2 Reactor Trip, the crew has transitioned to 2-EOP-TRIP-2, Reactor Trip Response.
• The crew is performing the Control Rod Insertion Step.
• Two Control Rods have failed to fully insert.
• 2CV175, RAPID BORATE STOP VALVE will NOT open.
Which of the following describes the valve manipulations required in accordance with 2-EOP-TRIP-2, Reactor Trip Response, to establish rapid boration.
A. OPEN RWST to CHARGING SUCTION VALVES 2SJ1 and 2SJ2, then CLOSE VCT to CHARGING SUCTION VALVES 2CV40 and 2CV41.
B. OPEN the BLENDER BYP VALVE 2CV174 locally, then OPEN the BA FLOW CONTROL TO BLENDER 2CV172.
C. OPEN BA FLOW CONTROL TO BLENDER 2CV172, then OPEN MAKE UP FROM BLENDER TO CHG PUMP SUCTION LINE 2CV185.
D. OPEN BA FLOW CONTROL TO BLENDER 2CV172, then OPEN MAKE UP FROM BLENDER TO VCT 2CV181.
▶ Show Answer & Explanation
✓ A. Correct. 2-EOP-TRIP-2, Reactor Trip Response directs the opening of the SJ1 & 2 to provide rapid boration flow from the RWST if the attempted opening of CV175 fails to establish rapid boration.
✗ B. Plausible because the candidate may believe that the procedure directs initiation of rapid boration through the 2CV174 when flow through the 2CV175 fails. This alternate path is actually utilized in S2.OP-SO.CVC-0008(Q), Rapid Boration, but not directed in TRIP-2.
✗ C. Plausible because the candidate may believe that the procedure directs initiation of rapid boration by utilizing the normal boration flowpath via the CV172 & CV185. This alternate path is actually utilized in S2.OP-SO.CVC-0008(Q), Rapid Boration, but not directed in TRIP-2.
✗ D. Plausible because the candidate may believe that the procedure directs initiation of rapid boration through the blender and the VCT via the CV172 & CV181. The candidate may not remember which valve is the normal boration flow path, the CV-181 or CV-185. Incorrect as boration flow is never directed to the top of the VCT (spray nozzle). Also not directed in TRIP-2.
Ref: 2-EOP-TRIP-2, Reactor Trip Response and Bases | LO: N/A | Source: Modified — Salem Vision Database | Cognitive: Comprehension
Connections
- Related systems: CVCS, ECCS
- Related EOPs: EOP-TRIP-2 — Reactor Trip Response
- Related procedures: S2.OP-SO.CVC-0008 — Rapid Boration
- Related exam: 2020 NRC Written Exam