Q62 — SFP Anti-Siphon Design
033000K4.03 (2.6)
Design features of the Spent Fuel Cooling and Purification System ensure the fuel stored in the Spent Fuel Pool will not become uncovered as a result of any postulated loss of system integrity.
Complete the following statement that best describes this design feature.
The Spent Fuel Pool is designed with…
Complete the following statement that best describes this design feature.
The Spent Fuel Pool is designed with…
A. a suction pipe inlet located above the top of fuel, and an anti-siphon hole on the return line that discharges above the top of the fuel.
B. an anti-siphon hole on the suction pipe, and a low level cut-off switch that automatically trips the Spent Fuel Cooling Pump.
C. an anti-siphon hole on the suction pipe, and the return line that discharges above the top of the fuel assemblies.
D. no drains on the pool, and double check valves on the pump discharge line to prevent backflow.
▶ Show Answer & Explanation
✓ A. Correct. The SFP cooling pump suction is approximately 4 feet below the pool surface and the SFP pump return line discharges into the pit approximately 6 feet above the top of the fuel assemblies. A 1/2 anti-siphon hole located below the pool surface on the discharge pipe prevents draining due to return line failure.
✗ B. Plausible because the return line has a 1/2 inch hole to prevent siphoning and the student may confuse suction and discharge piping design features.
✗ C. Plausible because the return line has a 1/2 inch hole to prevent siphoning and the student may confuse suction and discharge piping design features.
✗ D. Plausible because there are no drain lines in the spent fuel pit, but the pump discharge uses no check valves.
Ref: NOS05SFP000-10, Spent Fuel Cooling System | LO: ELOs 2,3,4,14 & 15 | Source: Modified Bank – 2015 Indian Point 2 NRC, Q59 | Cognitive: Fundamental
Connections
- Related systems: Spent Fuel Pool
- Related exam: 2020 NRC Written Exam