AB.RCP-0001 Attachment 2 CAS requires stopping RCPs for motor winding temp >302°F. Common distractors:
- Motor bearing temp 170°F — does NOT exceed CAS limit of >175°F
- Motor flange vibration 3 mils — entry condition for AB.RCP-0001 but CAS trip requires >5 mils
- CC-131 closure (thermal barrier valve) alone — CAS requires concurrent loss of BOTH seal injection AND thermal barrier CCW to secure within 2 minutes; loss of thermal barrier CCW alone does not require immediate trip

Trip reactor and stop affected RCP if ANY of the following validated conditions exist:
- CCW flow lost to ALL RCPs AND not restored within 5 minutes
- RCP Seal Injection AND Thermal Barrier CCW lost concurrently (secure within 2 minutes)
- Shaft vibration > 20 mils or motor flange vibration > 5 mils
- Motor bearing temperature > 175°F
- Motor winding temperature > 302°F (Modes 1-5)
- Seal water outlet temperature > 190°F
- #1 Seal leakoff < 0.8 gpm AND reverses to ≥ 6.0 gpm
- #1 Seal leakoff < 0.8 gpm with rising pump bearing/seal inlet temps
- #1 Seal leakoff ≥ 6 gpm

If vibration parameters are below Attachment 1 trip criteria (shaft 20 mils, motor flange 5 mils), do NOT immediately trip the RCP. Per Step 3.10, the CRS/SM determines if a controlled Unit shutdown is required to remove the affected RCP from service. Example: shaft vibration at 16 mils and motor flange at 3 mils — both below trip limits, so prepare for controlled shutdown rather than immediate trip.

A #3 seal leak is indicated by STANDPIPE LEVEL-LO alarm with #1 seal leakoff steady at 1.5 gpm (normal, indicating intact #2 seal). Action: make-up to the standpipe per the ARP; power operation may continue. AB.RCP-0001 does not provide specific direction for a #3 seal leak. Trap: the orderly shutdown and stop RCP within 8 hours action applies to a degraded #2 seal, not a #3 seal leak.

Loss of CCW thermal barrier: if 1CC190 closes (common return), ALL RCP thermal barriers lose CCW. RCPs may continue running if charging flow is maintained. Trip RCP within 2 minutes only if BOTH CCW and charging are lost.

Attachment 1: #1 seal leak-off flow >= 6 gpm indicates a #1 seal failure — go to Attachment 2 (Stopping RCPs). Attachment 2 directs: manual reactor trip, stop affected RCP, then 3-5 minutes after stopping close the CV104 valve, then go to EOP-TRIP-1. High seal leak-off indicates #1 seal failure (not #2). An orderly shutdown within 8 hours applies to a degraded #2 seal (leak-off < 0.8 gpm or slowly approaching 6 gpm), NOT a failed #1 seal at >= 6 gpm.

CC131 thermal barrier isolation and RCP trip requirement: loss of thermal barrier CCW alone (with seal injection still normal) does NOT require securing ALL RCPs within 2 minutes. The 2-minute CAS action applies only when BOTH seal injection AND thermal barrier CCW are lost concurrently. CC131 auto-closure setpoint: 175 gpm hi flow. Trap: candidates may confuse CC131 closure (thermal barrier loss only) with loss of ALL seal cooling, but seal injection via CVCS is a separate and independent cooling path.

RCP #2 seal failure diagnostics: standpipe level HIGH alarm combined with #1 seal leak-off flow LOWERED = #2 seal failure. Standpipe level LOW alarm = #3 seal problem. Do not confuse standpipe high vs low alarm implications.

AB.RCP-0001 CAS: motor flange vibration > 5 mils requires stopping the RCP (Attachment 2). After reactor trip from 75% power with one RCP stopped and RTB A closed but RTB B open, LCO 3.4.1.2 IS met because with the rod control system de-energized (RTB B open, bypass breakers not racked in), only two RCS loops are required to be OPERABLE. Trap: LCO 3.4.1.2 requires ALL loops OPERABLE only when rod control is ENERGIZED. Candidates confuse the energized vs de-energized requirements.

Attachment 2 — concurrent loss of seal injection AND thermal barrier CCW (2CC131 closes AND CV pumps unavailable): with Seal Leakoff < 6 gpm, the crew is NOT required to close 21-24CV104s (SEAL LEAKOFF) within 3-5 minutes after stopping RCPs (Step 1.4). At Attachment 2 Step 5.0, seal cooling method depends on RCP Seal Inlet Temperatures: if ALL temps are < 225 °F, perform Attachment 4 (Re-establishing RCP Seal Cooling); if NOT ALL temps are < 225 °F, perform S2.OP-AB.RC-0004 (Natural Circulation) for seal cooling. Trap: 22 RCP at 227 °F exceeds the 225 °F threshold, so not ALL are less than 225 °F. The procedure routes to Natural Circulation, not Attachment 4.