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Exams > 2018 Q14 — Containment Spray Pump Power Supplies

2018 Q14 — Containment Spray Pump Power Supplies

⚠️ DRAFT
Q14 — Containment Spray Pump Power Supplies 026 CSS-K2.01 (3.4)
Given:
- A LOCA coincident with a Loss Of Offsite Power has occurred at Unit 2
- The 2C 4KV Vital Bus is de-energized due to a fault on the bus

At time 16:30:00
- Containment Pressure is 15.1 psig and slowly rising

At 16:30:30, which ONE of the following completes the statements below?

___ Containment Spray Pump(s) is/are running
A. NO
B. BOTH
C. ONLY 21
D. ONLY 22
▶ Show Answer & Explanation
✓ C. Correct. 21 CS Pump is powered from 2A 4KV Vital Bus and 22 CS Pump is powered from 2C 4KV Vital Bus. Additionally, a Containment Spray actuation occurs at 15 psig Containment pressure. At 16:30:00, a containment spray actuation signal exists and 2C 4KV Vital Bus is de-energized. Consequently, ONLY 21 CS Pump is running.
✗ A. The candidate could incorrectly conclude that at 16:30:00, the Containment Spray setpoint has not been reached or that the electrical transient has affected both CS pumps. In either case, the candidate would then incorrectly deduce that no CS pumps are running.
✗ B. The candidate could incorrectly conclude that both CS pumps are not powered from the 2C 4KV Vital Bus. Consequently, with a valid Containment Spray signal present, the candidate would incorrectly deduce that both CS pumps are running.
✗ D. The candidate could incorrectly conclude that only the 21 CS Pump is powered from 2C 4KV Vital Bus. Consequently, with a valid Containment Spray signal present, the candidate would incorrectly deduce that only 22 CS pump is running.
Ref: NOS05FLUNCY-09 (Licensed Operator Fluency List), NOS05CSPRAY-06 (Containment Spray System) | LO: NOS05CSPRAY-06 — State the power supply to the Containment Spray Pumps | Source: Modified Bank | Cognitive: Higher (Analysis)

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