Q34 — Fuel Transfer Cart Interlocks
034 FHES-A1.02 (2.9)
Given:
• A Unit 1 Core reload is in progress
• The Fuel Transfer Cart is in the Fuel Handling Building with the upender in the horizontal position
At 09:00:00
• The limit switch on the Fuel Transfer Tube Gate Valve fails and the valve no longer indicates open
• An NEO has verified that the Fuel Transfer Tube Gate Valve is open
At 09:05:00
• Water level in the refueling canal begins to rapidly lower
• The crew is preparing to close the Fuel Transfer Tube Gate Valve
Which ONE of the following completes the statements below?
At 09:00:00 and if desired, the Fuel Transfer Cart can be moved MANUALLY _(1)_ to Containment with the failed limit switch on the Fuel Transfer Tube Gate Valve.
At 09:05:00, the crew _(2)_ FULLY close the Fuel Transfer Tube Gate Valve with the Fuel Transfer Cart located in the Fuel Handling Building.
• A Unit 1 Core reload is in progress
• The Fuel Transfer Cart is in the Fuel Handling Building with the upender in the horizontal position
At 09:00:00
• The limit switch on the Fuel Transfer Tube Gate Valve fails and the valve no longer indicates open
• An NEO has verified that the Fuel Transfer Tube Gate Valve is open
At 09:05:00
• Water level in the refueling canal begins to rapidly lower
• The crew is preparing to close the Fuel Transfer Tube Gate Valve
Which ONE of the following completes the statements below?
At 09:00:00 and if desired, the Fuel Transfer Cart can be moved MANUALLY _(1)_ to Containment with the failed limit switch on the Fuel Transfer Tube Gate Valve.
At 09:05:00, the crew _(2)_ FULLY close the Fuel Transfer Tube Gate Valve with the Fuel Transfer Cart located in the Fuel Handling Building.
A. _(1)_ ONLY _(2)_ can
B. _(1)_ ONLY _(2)_ can NOT
C. _(1)_ or ELECTRICALLY _(2)_ can
D. _(1)_ or ELECTRICALLY _(2)_ can NOT
▶ Show Answer & Explanation
✓ B. Correct. For Part 1, the Fuel Transfer Cart has two interlocks that will prevent/allow cart movement: upender must be in the horizontal position and the Fuel Transfer Tube Gate Valve must be open (as indicated with the open limit switch). At 09:00:00, both interlocks are not satisfied and the Fuel Transfer Cart can not be moved to containment. For Part 2, the crew can not close the Fuel Transfer Tube Gate Valve with the Fuel Transfer Cart located in the Fuel Handling Building.
✗ A. Part 1 is correct. For Part 2, the candidate could incorrectly conclude that the Fuel Transfer Tube Gate Valve can be closed regardless of the fuel transfer cart location (inside containment or inside the fuel handling building).
✗ C. For Part 1, the candidate could incorrectly conclude that the fuel cart interlock was only based on position of the upender and the Fuel Transfer Tube Gate Valve was verified open administratively prior to moving the fuel transfer cart. For Part 2, the candidate could incorrectly conclude that the valve can be closed regardless of fuel transfer cart location.
✗ D. For Part 1, the candidate could incorrectly conclude that the fuel cart interlock was only based on position of the upender and the Fuel Transfer Tube Gate Valve was verified open administratively prior to moving the fuel transfer cart. Part 2 is correct.
Ref: S2.OP-AB.FUEL-0002 (Loss Of Refueling Cavity Or Spent Fuel Pool Level), NOS05REFUEL-11 (Refueling System) | LO: NOS05REFUEL-11 Obj 5 — Outline the interlocks associated with refueling system components | Source: Modified Bank | Cognitive: Higher
Connections
- Related systems: Refueling
- Related abnormals: AB.FUEL-0002 — Loss of Refueling Cavity or SFP Level
- Related exam: 2018 NRC Written Exam