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Exams > 2019 Q62 — 500 KV Line Operability During Abnormal Grid

2019 Q62 — 500 KV Line Operability During Abnormal Grid

⚠️ DRAFT
Q62 — 500 KV Line Operability During Abnormal Grid 077 Generator Voltage and Electric Grid Disturbances-G2.2.37 (3.6)
Given:
• Unit 2 is MODE 3
• The crew is performing S2.OP-AB.GRID-0001 (ABNORMAL GRID)
• The voltages on the 500 KV Lines are as follows:

Orchard (5021)New Freedom (5024)Salem-Hope Creek Tie (5037)
492 KV494 KV497 KV

Which ONE of the following completes the statements below?

In accordance with S2.OP-AB.GRID-0001 CAS ___
A. ONLY the Orchard and New Freedom 500 KV Lines are inoperable
B. ONLY the Orchard 500 KV Line is inoperable
C. ALL of the 500 KV Lines are inoperable
D. ALL of the 500 KV Lines are OPERABLE
▶ Show Answer & Explanation
✓ B. Correct. IAW S2.OP-AB.GRID-0001 CAS, "IF AT ANY TIME one of the following conditions for the 500KV Switchyard exists OR is predicted to occur by PJM/ESOC upon the loss of either Salem Unit 1 OR Unit 2 Main Generator: Salem 500KV Switchyard voltage is less than 493KV, or Salem 500KV Switchyard voltage drops by greater than 2%. THEN DECLARE the associated A.C. Circuit (Off-Site Power Source) inoperable." Based on the given plant conditions, ONLY the Orchard 500 KV Line (492 KV) is NOT OPERABLE.
✗ A. Incorrect but plausible. The candidate could misinterpret the 500 KV Voltages with the standard and incorrectly determine that ONLY the Orchard and New Freedom 500 KV Lines are inoperable.
✗ C. Incorrect but plausible. The candidate could misinterpret the 500 KV Voltages with the standard and incorrectly determine that ALL 500 KV Lines are inoperable.
✗ D. Incorrect but plausible. The candidate could misinterpret the 500 KV Voltages with the standard and incorrectly determine that ALL 500 KV Lines are OPERABLE.
Ref: S2.OP-AB.GRID-0001 | LO: NOS05ABGRID-12 | Source: New | Cognitive: Higher

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