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Exams > 2023 Q44 — AFW 2DR6 Air Leak / Tank Overflow

2023 Q44 — AFW 2DR6 Air Leak / Tank Overflow

⚠️ DRAFT
Q44 — AFW 2DR6 Air Leak / Tank Overflow T2G1 191001 K1.04 (3.2)
Given:
• Salem Unit 2 is at 100% power

Then:
• The Primary Equipment Operator reports a significant air leak on the air supply line at the connection to the 2DR6, AFW Tank Makeup, valve actuator

Which of the following describes the expected impact to the Auxiliary Feedwater System (assuming the leak is causing a reduction in air pressure to the actuator) and operator response, if any?

AFW storage tank level will ...
A. rise and overflow; local/manual control is NOT available.
B. rise and overflow; local/manual control is available.
C. remain the same; local/manual control is available.
D. remain the same; local/manual control is NOT available.
▶ Show Answer & Explanation
✓ B. Correct. The 2DR6 will fail to the open position on loss of air. This will result in the AFWST level rising and potentially overflowing the tank. Per S2.OP-AB.CA-0001, Attachment 2, the 2DR6 can be manually operated from the field to control tank level.
✗ A. Incorrect. Plausible because not all air operated valves can be manually operated in the field.
✗ C. Incorrect. Plausible because the operator may believe that the 2DR6 failing open would result in tank overflow, thus its failure position would be closed to prevent this (air to open actuator).
✗ D. Incorrect. Plausible because the operator may believe that the 2DR6 failing open would result in tank overflow, thus its failure position would be closed to prevent this (air to open actuator).
Ref: NOS05AFW000-18, S2.OP-AB.CA-0001 (R22) | Source: New | Cognitive: Comprehension/Analysis
K/A: 191001 K1.04 — The failed-valve positions for different operators (open, closed, and as-is positions spring loaded valves; hydraulic, pneumatically controlled valves; electric motor-driven valves)

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