2018 Q21 — EDG TS 3.8.1.2 (Shutdown)

✓ A. Correct. For Part 1, LCO 3.8.1.2 requires a minimum of two separate and independent diesel generators to be OPERABLE. For Part 2, If ALL REQUIRED EDGs are inoperable, the crew is required to IMMEDIATELY suspend all operations involving positive reactivity changes.

✗ B. Incorrect but plausible. Part 1 is correct. For Part 2, LCO 3.8.1.2 REQUIRED ACTION A has an option to ONLY declare the affected required features inoperable in lieu of suspending all operations involving positive reactivity changes. Consequently, the candidate could incorrectly conclude that LCO 3.8.1.2 REQUIRED ACTION B does not require suspending all operations involving positive reactivity changes.

✗ C. Incorrect but plausible. For Part 1, LCO 3.8.1.1 (ELECTRICAL POWER SYSTEMS - OPERATING) requires a minimum of three separate and independent diesel generators to be OPERABLE. Consequently, the candidate could incorrectly conclude that LCO 3.8.1.2 also requires a minimum of three separate and independent diesel generators to be OPERABLE. Part 2 is correct.

✗ D. Incorrect but plausible. For Part 1, LCO 3.8.1.1 (ELECTRICAL POWER SYSTEMS - OPERATING) requires a minimum of three separate and independent diesel generators to be OPERABLE. Consequently, the candidate could incorrectly conclude that LCO 3.8.1.2 also requires a minimum of three separate and independent diesel generators to be OPERABLE. For Part 2, LCO 3.8.1.2 REQUIRED ACTION A has an option to ONLY declare the affected required features inoperable in lieu of suspending all operations involving positive reactivity changes. Consequently, the candidate could incorrectly conclude that LCO 3.8.1.2 REQUIRED ACTION B does not require suspending all operations involving positive reactivity changes.

Ref: NOS05EDG000-12 (EMERGENCY DIESEL GENERATORS) | LO: 10 — Given a situation dealing with Emergency Diesel Generator operability, examine the situation and apply the appropriate Technical Specification action | Source: New | Cognitive: Lower