Q59 — LOPA-1 SEC De-energize / RCP Seal Damage
EPE: 055 Station Blackout-EK3.02 (4.3)
Given:
• The crew is preparing to perform the Vital Power Restoration Steps of 1-EOP-LOPA-1 (Loss Of All AC Power)
In accordance with 1-EOP-LOPA-1, which ONE of the following completes the statements below?
Prior to restoring AC power, the crew will ensure ALL SECs are _(1)_.
Preventing damage to the RCP seals _(2)_ a reason that the centrifugal charging pumps are NOT allowed to start automatically following power restoration.
• The crew is preparing to perform the Vital Power Restoration Steps of 1-EOP-LOPA-1 (Loss Of All AC Power)
In accordance with 1-EOP-LOPA-1, which ONE of the following completes the statements below?
Prior to restoring AC power, the crew will ensure ALL SECs are _(1)_.
Preventing damage to the RCP seals _(2)_ a reason that the centrifugal charging pumps are NOT allowed to start automatically following power restoration.
A. _(1)_ de-energized / _(2)_ is NOT
B. _(1)_ de-energized / _(2)_ is
C. _(1)_ blocked and reset / _(2)_ is NOT
D. _(1)_ blocked and reset / _(2)_ is
▶ Show Answer & Explanation
✓ B. Correct. For Part 1, IAW 1-EOP-LOPA-1, prior to restoring AC power, the crew will ensure ALL SECs are de-energized. For Part 2, IAW 1-EOP-LOPA-1, preventing damage to the RCP seals is a reason that the centrifugal charging pumps are not allowed to start automatically following power restoration.
✗ A. Incorrect but plausible. Part 1 is correct. For Part 2, restoring seal injection is normally desirable and will usually help protect the RCP seals. Consequently, the candidate could incorrectly conclude that preventing RCS seal damage is NOT a reason for preventing auto start of the centrifugal charging pumps following power restoration.
✗ C. Incorrect but plausible. For Part 1, blocking and resetting the SECs is performed throughout the EOP Network (e.g. EOP-TRIP-1). Consequently, the candidate could incorrectly conclude that EOP-LOPA-1 requires ALL SECs to be blocked and reset.
✗ D. Incorrect but plausible. For Part 1, blocking and resetting the SECs is performed throughout the EOP Network (e.g. EOP-TRIP-1). Consequently, the candidate could incorrectly conclude that EOP-LOPA-1 requires ALL SECs to be blocked and reset. Part 2 is correct.
Ref: 1-EOP-LOPA-1 (Loss Of All AC Power) | LO: NOS05LOPA00-06 | Source: New | Cognitive: Lower
Connections
- Related systems: SECs, RCPs, CVCS
- Related EOPs: EOP-LOPA-1 — Loss of All AC Power
- Related exam: 2018 NRC Written Exam