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Abnormals > AB.CA-0001 — Loss of Control Air

AB.CA-0001 — Loss of Control Air

⚠️ DRAFT

AB.CA-0001 — Loss of Control Air

⚠️ DRAFT — Reconstructed from exam materials

Purpose

Provides guidance for responding to a loss of control/instrument air on Salem Unit 2, including identification of affected equipment and manual operation of air-operated valves.

Key Information

Attachment 2 — Auxiliary Feedwater System Valve Failure Positions

ValveFailsDescriptionManual Op
21-24AF11FO23AFP Disch to 21-24SGYes
21-24AF21FOAFP to 21-24SGYes
21-23AF52FCAFP Suct XConnYes
21-22AF40FO21-22AF Pump RecircYes
2MS53FHSS23AFP Turbine GovernorYes
2MS132FO23AFP Turbine Steam Inlet-
2DR6FOSupply to AFWYes

Other Key Valve Failure Positions

ValveFailsDescriptionManual Op
21/22SW122FOSW Inlet Control Valve to CCW HXYes
Exam — 2023 Q43
2MS132 (23 AFW Turbine Steam Inlet Valve) fails OPEN on loss of air. This causes 23 AFW pump to start and inject cold feedwater into all SGs, raising reactor power above 100% RTP. Operator should reduce power per S2.OP-IO.ZZ-0004.
Exam — 2023 Q44
2DR6 (AFW Tank Makeup valve) fails OPEN on loss of air. This causes AFWST level to rise and potentially overflow. Per Attachment 2, 2DR6 can be manually operated from the field to control tank level.
Exam — 2023 Q51
21SW122 (SW Inlet Control Valve to CCW HX) fails OPEN on loss of air (fails CLOSED on loss of 125VDC). When open, SW flow rises through CCW HX, lowering CCW temperature, which lowers RHR HX outlet temperature and raises cooldown rate. Can be manually operated per Attachment 2.
Exam — 2020 Q15
ECAC starting criteria and CAS: if 2B CA Header is ≤ 88 psig, notify Unit 1 NCO to start #1 ECAC (#1 ECAC senses CA Header B). CAS: if BOTH CA headers lower to < 80 psig, Trip the Reactor. #2 ECAC senses CA Header A (not B). #1 ECAC senses CA Header B (not A). The ECAC number does NOT match the header letter. The CAS requires BOTH headers < 80 psig, not EITHER.
Exam — 2020 Q45
BF19 (Main Feedwater Regulating Valves) on loss of all station air: BF19s start to close at 80 psig control air header pressure (per AB.CA-0001 bases). CAS directs: monitor BF19s for closure and inability to control SG level, or less than 80 psig control air header pressure → trip the reactor. 85 psig is the ECAC auto-start setpoint, not the BF19 closure pressure. BF19s receive air from Unit 1 via Lunkenheimer panels, but on total loss of all station air compressors, no Unit 1 CA available. ECACs cannot supply BF19 CA headers — a check valve isolates the turbine building headers from the ECAC supply.
Exam — 2022 Q88
On loss of all control air with letdown isolated: 1CV55 fails OPEN and 1CV71 fails CLOSED, resulting in higher charging flow and pressure to RCP seals, causing PZR level to RISE. Two preferred actions: (1) locally control charging flow by adjusting 1CV54, CENT CHG PUMP FLOW CONT VLV, or (2) transfer to 13 PDP whose speed controller fails at the low speed stop, minimizing seal flow. PZR level rises (not lowers) because charging flow increases with letdown isolated and CV55 failed open.
Exam — 2018 Q61
ECAC manual start criteria per Step 3.10: start 2 ECAC when 2A Control Air Header ≤ 88 psig. With headers trending down (99→88→79→72 psig on 2A, 103→93→85→79 psig on 2B), earliest ECAC start is when 2A first hits 88 psig. CAS reactor trip criteria: BOTH 2A and 2B Control Air Headers indicate < 80 psig — earliest trip is when 2B (the last header to drop) falls below 80 psig. Trap: 100 psig is the threshold for starting the remaining Station Air Compressor (Step 3.7), not the ECAC. Also, the reactor trip requires BOTH headers below 80 psig — not just ONE header.
Exam — 2019 Q61
ECAC manual start criteria: crews will MANUALLY start the 1 ECAC and 2 ECAC when the 1A/1B/2A/2B Control Air Headers lower to a MAXIMUM of 88 psig. 100 psig is the threshold at which the remaining Station Air Compressor is started — not the ECAC manual start threshold. Ensuring proper operation of the BF19s (Main Feedwater Control Valves) is NOT a reason for starting the ECACs — check valves in the CA system prevent the ECACs from supplying the BF19s.
Exam — 2019 Q93
AB.CA-0001 CAS reactor trip criteria (SRO question): when BOTH Control Air Headers indicate less than 80 psig (1A at 79 psig, 1B at 77 psig), the crew's next action is to TRIP the Reactor and perform EOP-TRIP-1 CONCURRENTLY with AB.CA-0001 Attachment 12 (LOCAL CONTROL OF SG PRESSURE AND LEVEL). Trap: Attachment 5 (Excess Flow Check Valves) only applies when at least one header is GREATER than 80 psig (Step 3.17). Attachment 6 (Abnormal Cooling Water Lineups) is not required unless cooling water to air compressors was lost. A controlled shutdown per IO.ZZ-0004 is NOT appropriate when BOTH headers are below 80 psig.

PZR Level and RCS Cooldown Requirement

Exam — 2019 Q80
Per S2.OP-AB.CA-0001: any time Pressurizer Level approaches a MINIMUM of 90%, the crew is required to commence an RCS Cooldown to 350 °F using guidance contained in S2.OP-AB.CA-0001 itself (NOT S2.OP-IO.ZZ-0006). Trap: 70% is the PZR LEVEL HI Bezel Alarm, not the cooldown trigger. The cooldown threshold is 90%. Also, the cooldown is directed by AB.CA-0001, not the IOP for Hot Standby to Cold Shutdown.
Exam — 2018 Q93
Number 1 ECAC provides air to 1B and 2B CA Headers ONLY due to check valves between Unit 1 Control Air and Station Air. Per S1.OP-AB.CA-0001, Attachment 12 ("Local Control Of SG Pressure and Level") is directed when BOTH 1A and 1B Control Air Headers indicate less than 80 psig. Trap: the criterion is BOTH headers, not EITHER header, below 80 psig.
Exam — 2018 Q90
BF19 (SG FW CONT V) valve failure position on loss of control air: BF19s fail CLOSED. SG levels are expected to LOWER until local control of BF19s can be established. If the crew manually trips the reactor because SG levels cannot be maintained, the crew performs 2-EOP-TRIP-1 AND S2.OP-AB.CA-0001 concurrently (CAS directs concurrent performance). Trap: some ABs (e.g., AB.COND-0001) direct performing EOP-TRIP-1 ONLY after a reactor trip. AB.CA-0001 specifically directs concurrent performance — do not assume all ABs have the same CAS.

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