Q56 — ATWS / FRSM-1 Charging Pumps
EPE: 029 ATWS-EA1.01 (3.4)
Given:
• Unit 2 is at 100% Reactor Power and stable
• 21 Charging Pump is in service
At time 10:00:00
• A valid reactor trip signal is generated by RPS but the Reactor Trip Breakers do NOT open
At time 10:00:10
• The crew has transitioned to 2-EOP-FRSM-1 (Response To Nuclear Power Generation)
• SI has NOT actuated
In accordance with 2-EOP-FRSM-1, which ONE of the following completes the statements below?
The crew will ensure _(1)_ Charging Pumps are running.
After the REQUIRED Charging Pumps have been started, the crew _(2)_ REQUIRED to MANUALLY actuate Safety Injection.
• Unit 2 is at 100% Reactor Power and stable
• 21 Charging Pump is in service
At time 10:00:00
• A valid reactor trip signal is generated by RPS but the Reactor Trip Breakers do NOT open
At time 10:00:10
• The crew has transitioned to 2-EOP-FRSM-1 (Response To Nuclear Power Generation)
• SI has NOT actuated
In accordance with 2-EOP-FRSM-1, which ONE of the following completes the statements below?
The crew will ensure _(1)_ Charging Pumps are running.
After the REQUIRED Charging Pumps have been started, the crew _(2)_ REQUIRED to MANUALLY actuate Safety Injection.
A. _(1)_ ALL three / _(2)_ IS
B. _(1)_ ALL three / _(2)_ is NOT
C. _(1)_ AT LEAST two / _(2)_ is
D. _(1)_ AT LEAST two / _(2)_ is NOT
▶ Show Answer & Explanation
✓ D. Correct. For Part 1 and IAW 2-EOP-FRSM-1 Step 3, the crew will ensure at least two charging pumps are running. For Part 2 and IAW 2-EOP-FRSM-1 Step 3.1, the crew is not required to actuate Safety Injection.
✗ A. Incorrect but plausible. For Part 1, having 3 Charging Pumps running will inject Boron faster than only 2 Charging Pumps. Since an ATWS is in progress, the candidate could incorrectly conclude that FRSM-1 requires all 3 Charging Pumps in operation. For Part 2, 2-EOP-FRSM-1 has a provision for aligning the charging pumps to take suction from the RWST. Consequently, the candidate could incorrectly conclude that for the given plant conditions, the crew will align the charging pumps to take suction from the RWST.
✗ B. Incorrect but plausible. For Part 1, having 3 Charging Pumps running will inject Boron faster than only 2 Charging Pumps. Since an ATWS is in progress, the candidate could incorrectly conclude that FRSM-1 requires all 3 Charging Pumps in operation. Part 2 is correct.
✗ C. Incorrect but plausible. Part 1 is correct. For Part 2, the candidate could incorrectly conclude that actuating Safety Injection is advantageous and required per FRSM-1.
Ref: 2-EOP-FRSM-1 (Response To Nuclear Power Generation) | LO: NOS05FRSM00-04 | Source: New | Cognitive: Lower
Connections
- Related systems: CVCS, RPS/SSPS
- Related EOPs: EOP-FRSM-1 — Response to Nuclear Power Generation
- Related exam: 2018 NRC Written Exam