PCIS Group Isolations Flashcards
Group 1 Isolation Signals
(Main Steam) RWL LLL ≥ -113” Vacuum Low ≥ 8” Hg MSL Low Pressure ≥ 835# MSL High Flow ≤ 142.7% MSL High Area Temp ≤ 195°F
Group 2 Isolation Signals
(PC Priorities)
RWL L ≥ +3”
DW High Pressure ≤ 1.84#
Group 3 Isolation Signals
(RWCU) RWL LL ≥ -42” RWCU F/D High Inlet 140°F SLC Initiation RWCU High Flow ≤ 191% RWCU Area Temp ≤ 195°F
Group 4 Isolation Signals
(HPCI)
HPCI Low Steam Supply Pressure ≥ 107#
HPCI High Steam Flow ≤ 250% w/ 6 sec TD
HPCI Area Temp ≤ 195°F
Group 5 Isolation Signals
(RCIC)
RCIC Low Steam Supply Pressure ≥ 61#
RCIC High Steam Flow ≤ 288% w/ 6 sec TD
RCIC Area Temp ≤ 195°F
Group 6 Isolation Signals
(RB)
RWL LL ≥ -42”
RB H&V High Rad ≤49 mrem/hr
DW High Pressure ≤1.84#
Group 7 Isolation Signals
(Fuel Failure)
RWL LLL ≥ -113”
MSL HI HI Rad ≤ 3x normal full power background
Group 1 Actions
Closes MSIVs and MS drain valves
Group 2 Actions (RHR)
Isolates RHR Shutdown Cooling flow path
Isolates RHR Injection Check Valve bypass valve
Isolates RHR to Radwaste and sample valves
Group 2 Actions (Other Than RHR)
Isolates DW floor and equipment drains Isolates PC Nitrogen supply Isolates steam supply to AOG Initiates TIP withdrawal signal Isolates supply and return valves to DW vent monitor
Group 3 Actions
Isolates RWCU system
Group 4 Actions
Trips HPCI turbine
Isolates HPCI SS line
Closes HPCI SP suction
Isolates HPCI exhaust line drains
Group 5 Actions
Trips RCIC turbine
Isolates RCIC SS line
Group 6 Actions
Isolates PC vent and purge system Trips RB ventilation fans Isolates RB ventilation system Isolates Recirc MG Set ventilation Starts SGT system Sends open signal to REC critical loop isolation supply valves
Group 7 Actions
Isolates Recirc Loop sample line
