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Exams > 2023 Q88 — Grid Disturbance / Solar Magnetic Disturbance

2023 Q88 — Grid Disturbance / Solar Magnetic Disturbance

⚠️ DRAFT
Q88 — Grid Disturbance / Solar Magnetic Disturbance T2G1 062 G2.1.6 (4.8)
Given:
• Salem Unit 2 is at 100% power

Then:
• The Electric System Operator (ESO) reports a Solar Magnetic Disturbance (SMD) of greater than K-5 intensity
• Salem control room has confirmed an Excess MVAR condition

The CRS will direct the crew to ...
A. trip the reactor and perform 2-EOP-TRIP-1, Reactor Trip or Safety Injection, and S2.OP-AB.GRID-0001, Abnormal Grid, concurrently.
B. trip the reactor and perform 2-EOP-TRIP-1, Reactor Trip or Safety Injection, Only.
C. initiate load reduction per S2.OP-AB.GRID-0001 Abnormal Grid, and S2.OP-AB.LOAD-0001, Rapid Load Reduction.
D. initiate load reduction per S2.OP-AB.GRID-0001 Abnormal Grid, Only.
▶ Show Answer & Explanation
✓ C. Correct. Per S2.OP-AB.GRID-0001, conditions for SMD are met in step 1.3, the CRS will direct the crew perform Attachment 2, Solar Magnetic Disturbance, and initiate a load reduction to less than or equal to 77.6% (942 MWe) at 15% per min using S2.OP-AB.LOAD-0001, Rapid Load Reduction.
✗ A. Plausible because tripping the reactor and going to 2-EOP-TRIP-1 is directed per Attachment 1 if frequency is less than or equal to 57.55 Hz. Incorrect in that performing S2.OP-AB.GRID-0001 is not required to be performed concurrently with 2-EOP-TRIP-1.
✗ B. Plausible because the SRO may believe that the grid conditions in the stem require the generator to be immediately isolated from the grid for asset protection and therefore an immediate reactor trip is required.
✗ D. Plausible because S2.OP-AB.GRID-0001 does direct initiating a load reduction to 77.6%. Incorrect in that S2.OP-AB.GRID-0001 Attachment 2 also directs initiating the rapid load reduction per S2.OP-AB.LOAD-0001.
Ref: S2.OP-AB.GRID-0001 (R23) | LO: NOS05ABGRID-13, Obj 2 — Describe, in general terms, the actions taken in S2.OP-AB.GRID-0001(Q) and the bases for the actions | Source: New | Cognitive: Comprehension/Analysis

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