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Exams > 2018 Q98 — TRIP-1 ATWS / FRSM-1 Transition

2018 Q98 — TRIP-1 ATWS / FRSM-1 Transition

⚠️ DRAFT
Q98 — TRIP-1 ATWS / FRSM-1 Transition G2.4.21 (4.6)
Given:
• Unit 2 is at 4% Reactor Power and stable

At time 10:00:00
• A valid Reactor Trip signal on 21 SG LO-LO Level is generated but the Reactor does NOT trip
• The crew enters 2-EOP-TRIP-1 (Reactor Trip or Safety Injection)
• ALL attempts to trip the Reactor from the Control Room fail

In accordance with 2-EOP-TRIP-1, which ONE of the following completes the statements below?

The crew will _(1)_ and _(2)_.

NOTE:
• 2-EOP-FRSM-1 (Response to Nuclear Power Generation)
A. (1) MANUALLY insert control rods    (2) continue in 2-EOP-TRIP-1
B. (1) MANUALLY insert control rods    (2) go to 2-EOP-FRSM-1
C. (1) allow control rods to insert AUTOMATICALLY    (2) continue in 2-EOP-TRIP-1
D. (1) allow control rods to insert AUTOMATICALLY    (2) go to 2-EOP-FRSM-1
▶ Show Answer & Explanation
✓ B. Correct. For Part 1, 2-EOP-TRIP-1 and 2-EOP-TRIP-1 Basis Document require rods to be inserted. The basis document allows rods to insert in AUTOMATIC if the RCS Temperature error is such that rods step in > 48 steps/minute. Since the plant is at 4% (turbine is not online), rods will not insert automatically greater than 48 steps/minute. Consequently, the rods will be inserted manually. For Part 2, IAW 2-EOP-TRIP-1, since the reactor is not tripped, the crew will go to 2-EOP-FRSM-1.
✗ A. Incorrect but plausible. Part 1 is correct. For Part 2, the candidate could incorrectly conclude that entry into 2-EOP-FRSM-1 is NOT required since reactor power is less than 5%.
✗ C. Incorrect but plausible. For Part 1, 2-EOP-TRIP-1 Basis Document allows rods to be left in automatic if certain conditions are met. Consequently, the candidate could incorrectly conclude that allowing the rods to insert automatically is preferred. For Part 2, the candidate could incorrectly conclude that entry into 2-EOP-FRSM-1 is NOT required since reactor power is less than 5%.
✗ D. Incorrect but plausible. For Part 1, 2-EOP-TRIP-1 Basis Document allows rods to be left in automatic if certain conditions are met. Consequently, the candidate could incorrectly conclude that allowing the rods to insert automatically is preferred. Part 2 is correct.
Ref: 2-EOP-TRIP-1 | LO: Not listed | Source: Bank (modified from January 2017 ILOT Exam SRO Q3) | Cognitive: Higher | SRO Only: Assess plant conditions and select procedure to mitigate/recover

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