2018 Q68 — SG Tube Leak Letdown Reduction and SI Initiation

✓ C. Correct. For Part 1, IAW S2.OP-AB.SG-0001 Step 3.7, the crew will reduce letdown to minimum by ONLY placing 2CV3 (45 gpm ORIFICE) in service. For Part 2, IAW S2.OP-AB.SG-0001 Step 3.11, the crew will initiate a safety injection prior to going to 2-EOP-TRIP-1.

✗ A. Incorrect but plausible. For Part 1, the candidate could conclude that avoiding a safety injection and doing a controlled plant shutdown is preferable. Consequently, isolating letdown will give the crew the most margin to maintain PZR level and to prevent a safety injection. Consequently, the candidate could incorrectly conclude that S2.OP-AB.SG-0001 directs the crew to isolate letdown. Part 2 is correct.

✗ B. Incorrect but plausible. For Part 1, the candidate could conclude that avoiding a safety injection and doing a controlled plant shutdown is preferable. Consequently, isolating letdown will give the crew the most margin to maintain PZR level and to prevent a safety injection. Consequently, the candidate could incorrectly conclude that S2.OP-AB.SG-0001 directs the crew to isolate letdown. For Part 2, the candidate could incorrectly conclude that a manual safety injection is not required until the crew reaches 2-EOP-TRIP-1 Step 5 (is SI actuated or required).

✗ D. Incorrect but plausible. Part 1 is correct. For Part 2, the candidate could incorrectly conclude that a manual safety injection is not required until the crew reaches 2-EOP-TRIP-1 Step 5 (is SI actuated or required).

Ref: S2.OP-AB.SG-0001 (Steam Generator Tube Leak) | LO: NOS05ABSGTL-05 — Given a set of initial plant conditions, determine the appropriate abnormal procedure, describe the plant response to actions taken, and describe the final plant condition | Source: New | Cognitive: Lower