Q42 — Containment Spray Pump Start with SEC
026 K2.01 (3.4)
Given:
• Unit 2 experienced a Large Break LOCA.
• The crew is performing actions per 2-EOP-TRIP-1, Reactor Trip or Safety Injection.
• The crew is at step 9, Containment Spray Actuation Verification.
• BOTH trains of Phase B/CS have actuated.
• Containment Pressure is 25 psig and rising.
• NO Containment Spray (CS) Pumps are running.
• 2C 4KV Vital Bus is de-energized on bus differential protection.
Which ONE of the following action(s) is/are required to start a CS Pump?
• Unit 2 experienced a Large Break LOCA.
• The crew is performing actions per 2-EOP-TRIP-1, Reactor Trip or Safety Injection.
• The crew is at step 9, Containment Spray Actuation Verification.
• BOTH trains of Phase B/CS have actuated.
• Containment Pressure is 25 psig and rising.
• NO Containment Spray (CS) Pumps are running.
• 2C 4KV Vital Bus is de-energized on bus differential protection.
Which ONE of the following action(s) is/are required to start a CS Pump?
A. Start 21 CS Pump by depressing the start pushbutton ONLY.
B. Start 22 CS Pump by depressing the start pushbutton ONLY.
C. Block and reset its associated SEC, then start 21 CS Pump using the keyswitch.
D. Block and reset its associated SEC, then start 22 CS Pump using the keyswitch.
▶ Show Answer & Explanation
✓ C. Correct. The operator must evaluate the plant conditions and determine that the SECs have not been reset. 21 CS Pump is powered from 2A 4KV Vital Bus. Since SECs actuated, the operator must first regain control by blocking and resetting 2A SEC only, then the operator must use the key switch to start 21 CS Pump.
✗ A. Incorrect. 2A SEC must be blocked and reset first then the keyswitch must be operated to start 21 CS Pump. Plausible if the operator believes that since CS has actuated that starting the pump is only required.
✗ B. Incorrect. 22 CS Pump is powered from 2C 4KV Vital Bus which is locked out on bus differential. Plausible if the operator believes that since CS has actuated that starting the pump is only required.
✗ D. Incorrect. 22 CS Pump is powered from 2C 4KV Bus which is locked out on bus differential.
Ref: NOS05CSPRAY | LO: NOS05CSPRAY-07, Obj 5 — State the power supply to the following Containment Spray System components: Containment Spray Pumps | Source: Bank — Salem | Cognitive: Comprehension/Analysis
Connections
- Related systems: Containment Spray, SECs, 4KV
- Related EOPs: EOP-TRIP-1 — Reactor Trip or Safety Injection
- Related exam: 2022 NRC Written Exam