Q92 — SFP Loss of Cooling / Makeup
033 SFPCS-G2.1.20 (4.6)
Given:
• The crew is performing S2.OP-AB.SF-0001 (Loss Of Spent Fuel Pool Cooling)
• Spent Fuel Pool temperature is 212 °F
• Spent Fuel Pool level is 128 feet, 0 inches
In accordance with S2.OP-AB.SF-0001, which ONE of the following completes the statements below?
The crew will makeup to the Spent Fuel Pool until the Spent Fuel Pool _(1)_.
The crew can perform S2.OP-SO.SF-0006 (Spent Fuel Pool Emergency Fill) _(2)_ to raise Spent Fuel Pool Level.
NOTE:
• S2.OP-SO.SF-0001 (Fill and Transfer of the Spent Fuel Pool)
• The crew is performing S2.OP-AB.SF-0001 (Loss Of Spent Fuel Pool Cooling)
• Spent Fuel Pool temperature is 212 °F
• Spent Fuel Pool level is 128 feet, 0 inches
In accordance with S2.OP-AB.SF-0001, which ONE of the following completes the statements below?
The crew will makeup to the Spent Fuel Pool until the Spent Fuel Pool _(1)_.
The crew can perform S2.OP-SO.SF-0006 (Spent Fuel Pool Emergency Fill) _(2)_ to raise Spent Fuel Pool Level.
NOTE:
• S2.OP-SO.SF-0001 (Fill and Transfer of the Spent Fuel Pool)
A. (1) HI LEVEL ALARM actuates (2) or S2.OP-SO.SF-0001
B. (1) HI LEVEL ALARM actuates (2) ONLY
C. (1) LOW LEVEL ALARM clears (2) or S2.OP-SO.SF-0001
D. (1) LOW LEVEL ALARM clears (2) ONLY
▶ Show Answer & Explanation
✓ A. Correct. For Part 1 and IAW S2.OP-AB.SF-0001, since SFP water is at the boiling point and SFP level at the Low Level alarm setpoint (128 feet, 0 inches), the crew is required to initiate makeup to the Spent Fuel Pool until the HI LEVEL ALARM actuates. For Part 2 and IAW S2.OP-AB.SF-0001, the crew can perform S2.OP-SO.SF-0006 (Spent Fuel Pool Emergency Fill) or S2.OP-SO.SF-0001 to raise Spent Fuel Pool Level.
✗ B. Incorrect but plausible. Part 1 is correct. For Part 2, since the SFP is boiling, the candidate could conclude that any makeup must be done as fast as possible. Consequently, the candidate could incorrectly conclude that S2.OP-AB.SF-0001 only allows a SFP makeup using S2.OP-SO.SF-0006 (Spent Fuel Pool Emergency Fill).
✗ C. Incorrect but plausible. For Part 1, since SFP Level is above the low level alarm setpoint (128 feet, 2 inches), the candidate could incorrectly conclude that S2.OP-AB.SF-0001 does not require a SFP makeup. Part 2 is correct.
✗ D. Incorrect but plausible. For Part 1, since SFP Level is above the low level alarm setpoint (128 feet, 2 inches), the candidate could incorrectly conclude that S2.OP-AB.SF-0001 does not require a SFP makeup. For Part 2, since the SFP is boiling, the candidate could conclude that any makeup must be done as fast as possible. Consequently, the candidate could incorrectly conclude that S2.OP-AB.SF-0001 only allows a SFP makeup using S2.OP-SO.SF-0006 (Spent Fuel Pool Emergency Fill).
Ref: S2.OP-AB.SF-0001 | LO: NOS05ABSFP1-06 Obj 2 | Source: New | Cognitive: Higher | SRO Only: Analyze SFP parameters and select procedure to mitigate during Loss of SFP Cooling
Connections
- Related systems: Spent Fuel Pool
- Related procedures: S2.OP-SO.SF-0001 — Fill and Transfer of Spent Fuel Pool, AB.SF-0001 — Loss of Spent Fuel Pool Cooling
- Related exam: 2018 NRC Written Exam