2018 Q40 — VCT Level / LT-112 Failure

✓ C. Correct. For Part 1, LT-112 will cause CV-35 to ONLY fully divert to the CVCS Holdup Tanks at 87% (no modulation of CV-35). Consequently, when LT-112 fails to 80%, CV-35 will remain fully aligned to the VCT and ACTUAL VCT Level will remain stable. For Part 2, LT-112 is the controlling transmitter for AUTO MAKE-UP. Consequently, with LT-112 failed at 80%, an AUTO MAKE-UP will NOT start when ACTUAL VCT level reaches the AUTO MAKE-UP set point.

✗ A. For Part 1, the VCT has two level transmitters (LT-112 and LT-114). If LT-114 had failed to 80%, CV-35 would be almost fully diverted to the CVCS Holdup Tanks. Consequently, the candidate could incorrectly conclude that CV-35 would be diverted, causing ACTUAL VCT level to lower. Part 2 is correct.

✗ B. For Part 1, the candidate could incorrectly conclude that CV-35 would be diverted. For Part 2, the candidate could incorrectly conclude that LT-114 controls the AUTO MAKE-UP function.

✗ D. Part 1 is correct. For Part 2, the candidate could incorrectly conclude that LT-114 controls the AUTO MAKE-UP function.

Ref: NOS05CVCS00-17 (Chemical and Volume Control System) | LO: NOS05CVCS00-17 Obj 7 — Identify and describe CVCS local controls, indications, and alarms | Source: Bank | Cognitive: Higher