Q35 — CCW Pump Status After SEC Mode 3 Loading
008000K4.09 (2.7)
Given:
• Unit 2 is at 100% power.
• 21 and 22 CCW Pumps are running.
• 23 CCW Pump is in AUTO.
Subsequently;
• The Unit experiences a valid Safety Injection actuation coincident with a Loss of Off-Site Power.
Which of the following describes the status of the CCW Pumps following successful SEC loading?
• Unit 2 is at 100% power.
• 21 and 22 CCW Pumps are running.
• 23 CCW Pump is in AUTO.
Subsequently;
• The Unit experiences a valid Safety Injection actuation coincident with a Loss of Off-Site Power.
Which of the following describes the status of the CCW Pumps following successful SEC loading?
A. All CCW pumps are running, all CCW pumps are in Manual.
B. All CCW pumps are stopped, 23 CCW pump remains in AUTO.
C. All CCW pumps are stopped, all CCW pumps are in Manual.
D. All CCW pumps are running, 23 CCW pump remains in AUTO.
▶ Show Answer & Explanation
✓ C. Correct. During a MODE III (Blackout + Safety Injection) SEC loading, CCW pumps are stripped and not restarted. CCW pumps are not loaded in MODE III loading. In MODE III, if a pump was selected for AUTO, it is transferred to Manual.
✗ A. Incorrect. Plausible because the candidate may confuse the MODE III SEC loading sequence with that of the MODE II loading sequence. Plausible because this would be correct for MODE II (Blackout), but incorrect as CCW pumps are not loaded in a MODE III (Blackout + Safety Injection). The second part is correct.
✗ B. Incorrect. Plausible because the first part is correct, CCW pumps are not loaded during a Blackout + Safety Injection condition. The second part is plausible as this would be the case for a MODE I (Safety Injection) loading. Incorrect as MODES II, III, and VI cause a pump selected to AUTO to shift to Manual.
✗ D. Incorrect. Plausible because the candidate may confuse the MODE III SEC loading sequence with that of the MODE II loading sequence. Plausible because this would be correct for MODE II (Blackout), but incorrect as CCW pumps are not loaded in a MODE III (Blackout + Safety Injection). The second part is plausible as this would be the case for a MODE I (Safety Injection) loading. Incorrect as MODES II, III, and VI cause a pump selected to AUTO to shift to Manual.
Ref: S2.OP-AR.ZZ-0011(Q), Component Cooling Water System Bezel 1-19 ARP. NOS05CCW000-11 | LO: NOS05CCW000-11, ELO 9 | Source: Bank, Salem ILT 16-01 NRC Exam, Q7 | Cognitive: Comprehension
Connections
- Related systems: CCW, SECs, EDGs
- Related procedures: S2.OP-AR.ZZ-0011 — Alarm Response (2CC1)
- Related exam: 2020 NRC Written Exam