AP 10 Flashcards
Purpose: This procedure covers the required operator actions for NC leakage where the NV pumps are capable of maintaining Pzr water level:
AP-10 NC System Leakage w/in capacity of NV Pumps
What are these symptoms of?
•”1EMF 33 COND AIR EJECT EXH HI RAD” alarm
•”1EMF 34 S/G SAMPLE HI RAD” alarm
•”1EMF 24 S/G A STEAMLINE HI RAD” alarm
•”1EMF 25 S/G B STEAMLINE HI RAD” alarm
•”1EMF 26 S/G C STEAMLINE HI RAD” alarm
•”1EMF 27 S/G D STEAMLINE HI RAD” alarm
•”1EMF 71 S/G A LEAKAGE HI RAD” alarm
•”1EMF 72 S/G B LEAKAGE HI RAD” alarm
•”1EMF 73 S/G C LEAKAGE HI RAD” alarm
•”1EMF 74 S/G D LEAKAGE HI RAD” alarm
•Unexpected decrease in VCT level trend
•Abnormally high frequency of auto makeup to VCT
•Feedwater flow and CF reg valve position indication going down in any S/G
•S/G level going up in an uncontrolled manner
•Confirmed primary to secondary leakage in excess of 125 GPD
•Shutdown required PER PT/1/A/4150/001C (Primary to Secondary Leakage Monitoring).
Case I Steam Generator Tube Leakage:
What are these symptoms of?
VCT level going down at unexpected rate
•Increase in frequency of auto makeup to VCT
•Leakage greater than Tech Spec limits
•High radiation as indicated on any of the following:
•1EMF-38(L) (Containment Particulate (LR))
•1EMF-39(L) (Containment Gas (LR))
1EMF-40 (Containment Iodine)
•EMF-41 (Aux Bldg Ventilation)
•1EMF-46A (Train A Component Cooling)
•1EMF-46B (Train B Component Cooling).
High levels in any of the following:
•Containment floor and equipment sump
•ND and NS sump
•NCDT
•RHT
•KC surge tank
•PRT.
High temperatures on any of the following:
•”PZR PORV DISCH HI TEMP” alarm
•”PZR SAFETY DISCHARGE HI TEMP” alarm
•”RX VESSEL FLANGE LEAK OFF HI TEMP” alarm
•”LETDN RELIEF HI TEMP” alarm
•PRT
•Containment.
NC pump thermal barrier KC outlet high flow computer alarm
•Letdown or charging line flow or pressure abnormal.
Case II NC System Leakage:
What flow path is this?
Check Pzr level stable or going up
•Increase charging to 90 gpm (VCT auto makeup in progress and level going down)
oAlign NVP suction to FWST
oStart MDCAPs
oTrip reactor and go to E-0 if > P-11 (if 125 gpd from one S/G
oReduce load to 350oF emergency borate for SDM per AP38. If
Case I Steam Generator Tube Leakage
What flow path is this?
Check Pzr level stable or going up. If going down:
•Increase charging to 80% swap NVP suction back to VCT
If leak on NCP thermal barrier:
•Close KC valve on affected NCP
•If KC RB header must be isolated, trip reactor, trip all NCPs, isolate leak, then GO TO E-0
If leak on NV letdown line near demins place 1NV-127A to VCT
If leak on normal NV letdown line:
•If suspected due to 1NV-6 open, ensure L/D press 150-350 psig and perform actions per 1AD-7,I4 ARP
•Isolate letdown if desired
•If tube leak suspected in LDHX, close 1NV-124
•If still not isolated place 1NV-137A to HUT, establish excess L/D, and continue in this AP
If leak on VCT isolate per Encl 9 is too large to continue operating
If leak on NV charging line isolate charging and letdown and establish excess letdown
Once leak is isolated and Pzr, CLA, NCDT, and CFAE sump normal
•Check with station management to see if shutdown required. If yes, shutdown per normal OPs or AP4
Case II NC System Leakage
Time Critical Tasks: Isolate letdown for a letdown header break within 30 min (FSAR Commitment)
