Q55 — CC131 Thermal Barrier Flow and RCP Trip Criteria
APE: 026 Loss of CCW-AA1.07 (2.9)
Given:
• Unit 2 is at 100% Reactor Power
At time 15:00
• 2CC131 Console Alarm, "Discharge Flow Hi", actuates
At time 15:01
• The crew has completed the Alarm Response Procedure for the 2CC131 Console Alarm and has transitioned to S2.OP-AB.RCP-0001 (Reactor Coolant Pump Abnormality)
Which ONE of the following completes the statements below?
2CC131 (RCP THERMAL BARRIER VALVE) AUTOMATICALLY closed when CC flow from the RCP Thermal Barrier reached a MINIMUM of _(1)_ gpm.
In accordance with S2.OP-AB.RCP-0001 CAS, the crew _(2)_ required to secure ALL RCPs within 2 minutes.
• Unit 2 is at 100% Reactor Power
At time 15:00
• 2CC131 Console Alarm, "Discharge Flow Hi", actuates
At time 15:01
• The crew has completed the Alarm Response Procedure for the 2CC131 Console Alarm and has transitioned to S2.OP-AB.RCP-0001 (Reactor Coolant Pump Abnormality)
Which ONE of the following completes the statements below?
2CC131 (RCP THERMAL BARRIER VALVE) AUTOMATICALLY closed when CC flow from the RCP Thermal Barrier reached a MINIMUM of _(1)_ gpm.
In accordance with S2.OP-AB.RCP-0001 CAS, the crew _(2)_ required to secure ALL RCPs within 2 minutes.
| (1) | (2) |
A. (1) 145 (2) is NOT
B. (1) 145 (2) is
C. (1) 175 (2) is NOT
D. (1) 175 (2) is
▶ Show Answer & Explanation
✓ C. Correct. For Part 1, 2CC131 (RCP THERMAL BARRIER VALVE) AUTOMATICALLY closed when CC flow from the RCP Thermal Barrier reached a MINIMUM of 175 gpm. For Part 2 and IAW S2.OP-AB.RCP-0001 CAS, with only Thermal Barrier Component Cooling flows lost (RCP Injection Flow is normal), the crew is NOT required to secure ALL RCPs within 2 minutes.
✗ A. Incorrect but plausible. For Part 1, 145 gpm is lo flow alarm setpoint of CC131. Consequently, the candidate could incorrectly conclude that CC131 will automatically close when flow reaches a minimum of 145 gpm. Part 2 is correct.
✗ B. Incorrect but plausible. For Part 1, 145 gpm is lo flow alarm setpoint of CC131. Consequently, the candidate could incorrectly conclude that CC131 will automatically close when flow reaches a minimum of 145 gpm. For Part 2, the candidate could incorrectly determine that RCP seal cooling has been lost and determine that in accordance with S2.OP-AB.RCP-0001 CAS, the crew is required to secure ALL RCPs within 2 minutes.
✗ D. Incorrect but plausible. Part 1 is correct. For Part 2, the candidate could incorrectly determine that RCP seal cooling has been lost and determine that in accordance with S2.OP-AB.RCP-0001 CAS, the crew is required to secure ALL RCPs within 2 minutes.
Ref: S2.OP-AR.ZZ-0011 Bezel 2CC131 ARP, S2.OP-AB.RCP-0001 | LO: NOS05CCW000-12 (COMPONENT COOLING WATER) | Source: New | Cognitive: Higher
Connections
- Related systems: CCW, RCPs
- Related procedures: S2.OP-AR.ZZ-0011 — Alarm Response (2CC1)
- Related abnormals: AB.RCP-0001 — RCP Abnormality
- Related exam: 2019 NRC Written Exam