Q58 — Loss of Offsite Power TS 3.8.1.1 Actions
APE: 056 Loss of Offsite Power-G2.2.39 (3.9)
Given:
• Unit 2 is in MODE 3 preparing to do a plant startup
• The Electrical Systems Operator has notified Unit 2 that the Orchard 500 KV Line (5021) and the New Freedom 500KV Line (5024) will be unavailable starting at 15:00 for a duration of 6 hours
At time 15:00
• Unit 2 has been isolated from the Orchard 500 KV Line (5021) and the New Freedom 500KV Line (5024)
• The 500 KV Salem-Hope Creek Tie-Line (5037) is still available to Unit 2
Considering ONLY the following actions below:
1. Demonstrate the OPERABILITY of the remaining independent A.C. circuit by performing Surveillance Requirement 4.8.1.1.1.a within 1 hour
2. Demonstrate the OPERABILITY of three diesel generators by performing Surveillance Requirement 4.8.1.1.2.a.2 within 1 hour
3. Immediately suspend all operations involving positive reactivity changes
Which ONE of the following completes the statements below?
At 15:00 and in accordance with Unit 2 LCO 3.8.1.1 (A.C. Sources - Operating), the crew must perform action(s) ___
• Unit 2 is in MODE 3 preparing to do a plant startup
• The Electrical Systems Operator has notified Unit 2 that the Orchard 500 KV Line (5021) and the New Freedom 500KV Line (5024) will be unavailable starting at 15:00 for a duration of 6 hours
At time 15:00
• Unit 2 has been isolated from the Orchard 500 KV Line (5021) and the New Freedom 500KV Line (5024)
• The 500 KV Salem-Hope Creek Tie-Line (5037) is still available to Unit 2
Considering ONLY the following actions below:
1. Demonstrate the OPERABILITY of the remaining independent A.C. circuit by performing Surveillance Requirement 4.8.1.1.1.a within 1 hour
2. Demonstrate the OPERABILITY of three diesel generators by performing Surveillance Requirement 4.8.1.1.2.a.2 within 1 hour
3. Immediately suspend all operations involving positive reactivity changes
Which ONE of the following completes the statements below?
At 15:00 and in accordance with Unit 2 LCO 3.8.1.1 (A.C. Sources - Operating), the crew must perform action(s) ___
A. 1 ONLY
B. 2 ONLY
C. 2 and 3 ONLY
D. 1, 2 and 3
▶ Show Answer & Explanation
✓ A. Correct. Based on the question stem and at 15:00, the crew must perform LCO 3.8.1.1 Required Action A (With an independent A.C. circuit of the above required A.C. electrical power sources inoperable). The only 1 hour or less required action per LCO 3.8.1.1(a.1) is to demonstrate the OPERABILITY of the remaining independent A.C. circuit by performing Surveillance Requirement 4.8.1.1.1.a within 1 hour.
✗ B. Incorrect but plausible. LCO 3.8.1.1 and LCO 3.8.1.2 (ELECTRICAL POWER SYSTEMS SHUTDOWN) have required actions that are consistent with Actions 2 and 3 contained in the question stem. Action 2 would be required within 8 hours if two of the above required independent A.C. circuits inoperable (LCO 3.8.1.1 (D)). Action 3 would be required if the Unit was in Mode 5 & 6 and with one of the above minimum required A.C. electrical power sources not OPERABLE. Consequently, any distractor containing Action 2 or Action 3 is plausible.
✗ C. Incorrect but plausible. See B Distractor Analysis.
✗ D. Incorrect but plausible. See B Distractor Analysis.
Ref: Unit 2 LCO 3.8.1.1 | LO: NOS05500KV-12 (500KV ELECTRICAL SYSTEM) | Source: New | Cognitive: Lower
Connections
- Related systems: 500KV
- Related tech specs: TS 3/4.8 — Electrical
- Related exam: 2019 NRC Written Exam