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Exams > 2018 Q93 — Loss of Control Air / ECAC / Attachment 12

2018 Q93 — Loss of Control Air / ECAC / Attachment 12

⚠️ DRAFT
Q93 — Loss of Control Air / ECAC / Attachment 12 079 SAS-A2.01 (3.2)
Given:
• Unit 1 is at 25% Power and stable
• The crew is performing S1.OP-AB.CA-0001 (Loss Of Control Air) due to a large non-isolable leak on the cross connect line between Station Air and the Unit 1 Control Air
• Number 1 ECAC is running

Which ONE of the following completes the statements below?

The Number 1 ECAC will provide air to 1B and 2B Control Air Headers _(1)_.
The CRS will direct performance of S2.OP-AB.CA-0001 Attachment 12, "Local Control Of SG Pressure and Level", when _(2)_ Control Air Header(s) indicate(s) less than 80 psig.
A. (1) and to Station Air    (2) EITHER 1A or 1B
B. (1) and to Station Air    (2) BOTH 1A and 1B
C. (1) ONLY    (2) EITHER 1A or 1B
D. (1) ONLY    (2) BOTH 1A and 1B
▶ Show Answer & Explanation
✓ D. Correct. For Part 1, based on location in which the Number 1 ECAC is physically connected into the Unit 1 Control Air System, the Number 1 ECAC will only provide air to the Unit 1 Control Air System (due to the presence of check valves between Unit 1 Control Air System and Station Air System). For Part 2 and IAW S1.OP-AB.CA-0001, the CRS will direct performance of S2.OP-AB.CA-0001 Attachment 12, "Local Control Of SG Pressure and Level", when BOTH 1A and 1B Control Air Headers indicate less than 80 psig.
✗ A. Incorrect but plausible. For Part 1, the candidate could not recall the existence of the check valves between Unit 1 Control Air and Station Air. Consequently, the candidate could then incorrectly conclude that the Number 1 ECAC will provide air to Unit 1 Control Air and Station Air. For Part 2, as Control Air pressure lowers below 80 psig, AOV operation will start to be compromised. Consequently, the candidate could incorrectly conclude that the CRS will direct performance of S2.OP-AB.CA-0001 Attachment 12, "Local Control Of SG Pressure and Level", when EITHER 1A or 1B Control Air Headers indicates less than 80 psig.
✗ B. Incorrect but plausible. For Part 1, the candidate could not recall the existence of the check valves between Unit 1 Control Air and Station Air. Consequently, the candidate could then incorrectly conclude that the Number 1 ECAC will provide air to Unit 1 Control Air and Station Air. Part 2 is correct.
✗ C. Incorrect but plausible. Part 1 is correct. For Part 2, as Control Air pressure lowers below 80 psig, AOV operation will start to be compromised. Consequently, the candidate could incorrectly conclude that the CRS will direct performance of S2.OP-AB.CA-0001 Attachment 12, "Local Control Of SG Pressure and Level", when EITHER 1A or 1B Control Air Headers indicates less than 80 psig.
Ref: S2.OP-AB.CA-0001 | LO: NOS05ABCA01-07 Obj 2 | Source: New | Cognitive: Lower | SRO Only: Analyze plant parameters and determine when to implement attachment of a procedure

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