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Exams > 2018 Q90 — Loss of Control Air / BF19 Failure / EOP-TRIP-1 Concurrent

2018 Q90 — Loss of Control Air / BF19 Failure / EOP-TRIP-1 Concurrent

⚠️ DRAFT
Q90 — Loss of Control Air / BF19 Failure / EOP-TRIP-1 Concurrent 078 IAS-G2.2.15 (4.3)
REFERENCE PROVIDED

Given:
• Unit 2 is at 100% Power and stable

At time 13:00:00
• The crew enters S2.OP-AB.CA-0001 (Loss Of Control Air)

In accordance with S2.OP-AB.CA-0001, which ONE of the following completes the statements below?

If Control Air pressure can NOT be restored, SG levels are expected to _(1)_ until local control of the 21-24BF19 (SG FW CONT V) can be established.

If the crew MANUALLY trips the reactor because SG Levels can NOT be maintained, the crew will perform 2-EOP-TRIP-1 (Reactor Trip Or Safety Injection) _(2)_.
A. _(1)_ rise    _(2)_ and S2.OP-AB.CA-0001 concurrently
B. _(1)_ rise    _(2)_ ONLY
C. _(1)_ lower    _(2)_ and S2.OP-AB.CA-0001 concurrently
D. _(1)_ lower    _(2)_ ONLY
▶ Show Answer & Explanation
✓ C. Correct. For Part 1, IAW S2.OP-AB.CA-0001, the BF19s (FW CONT VALVE) will fail closed as Control Air pressure lowers. Consequently, SG levels are expected to lower. For Part 2, IAW S2.OP-AB.CA-0001 (Selected CAS Items), once the reactor is tripped, the crew will perform 2-EOP-TRIP-1 and S2.OP-AB.CA-0001 concurrently.
✗ A. For Part 1, the candidate could incorrectly conclude that the BF19s (FW CONT VALVE) will fail open as Control Air pressure lowers. Consequently, the candidate would then incorrectly deduce that the SG levels are expected to rise. Part 2 is correct.
✗ B. For Part 1, the candidate could incorrectly conclude that the BF19s (FW CONT VALVES) will fail open as Control Air pressure lowers. Consequently, the candidate would then incorrectly deduce that the SG levels are expected to rise. For Part 2, other Abnormal Procedures (e.g. OP-AB-COND-001) require the crew to only perform EOP-TRIP-1 when reactor trip criteria have been met. Consequently, the candidate could incorrectly conclude that when reactor trip criteria have been met in S2.OP-AB.CA-0001, the crew will only perform 2-EOP-TRIP-1.
✗ D. Part 1 is correct. For Part 2, other Abnormal Procedures (e.g. OP-AB-COND-001) require the crew to only perform EOP-TRIP-1 when reactor trip criteria have been met. Consequently, the candidate could incorrectly conclude that when reactor trip criteria have been met in S2.OP-AB.CA-0001, the crew will only perform 2-EOP-TRIP-1.
Ref: S2.OP-AB.CA-0001, Drawing 205302 - SH 3 (portion) | LO: NOS05ABCA01-07 (LOSS OF CONTROL AIR) — 2. Describe, in general terms, the actions taken in S2.OP-AB.CA-0001 (Q) and the bases for the actions in accordance with the Technical Bases Document | Source: Modified Bank | Cognitive: Higher

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