ML17266A012

LER#78-040/03L-0 on 781002:During Pwr oper,1B Charging Pump Failed to Start While Only 1C Pump Was operable.Cause:1B Suction Pressure Gage Waspegged Highdue to Leaking Valve. Valve Repaired,Gage Vented & Pump Returned to Svc

ML17266A012
Person / Time
Site:	Saint Lucie
Issue date:	11/01/1978
From:	Schoppman M FLORIDA POWER & LIGHT CO.
To:
Shared Package
ML17206A504	List: ML17206A503 ML17266A012
References
LER-78-040-03L, LER-78-40-3L, NUDOCS 7811080217
Download: ML17266A012 (2)

Text

S~0 U.S.NUCL~eR REGULATORY

~I%SION i'IRC FOAM SSB I7 77 I LJCEINSEE EVENT REPORT*'"""'"": LJO[Pl EASE PRINT OR TYPc ALL R%CUIR ED IN FORMATIONI I d~Q Qrl il'i Ii IQ I-.ii I I-'~Ii>>I Q~S 3 9 L'CKHSRK CCOE 14 IS LICKS%HUM SSR 5 A'K.VSK.YJS 40 5~JAr$3 CCN'T QQ~Q~l'il'COCKS i'IUMSSR 43$3 KVKHT OAT%74 75 RErCRT 0*i 3 50 EVENT DESCRIPTION

'O PROBABLE CONSECUENCES Qlo~o~0 in W l 1 char in um was ino erable at the time therefore onl the 1C char in service in 95 minutes.This was the first occurrence of this t e due to to III the cause described below.~OB 7 3 9 10 SYSTEM CAUSE CAU5%C vr.vAI.vE C OR CCCE SU5C OE ccMroy EHT coo%SUE~~os SLSC00%~8 O'JS LJS~i'"'8 008 Lva 7 5 9 lil 11 Il 13 15 19 S SOU KH TI A L OCCURRKHCK REPORT'Kvlslo~'KRlqo EVKHTY AR aEPORTHO.COOK'VPS, Ho, Orr.rrrarrr~718~~0410 M~~03~L ll 33 ll 34 JS 17 33 JS JO ll ll ACTICH SUTURE KrsKCT SIIUTCOay AT-ACHMKVT yrRO<r IVSC-Mr CCMPCH KH T TAKKH ACTION Cy r LANT METIIOO HOURs~32 susMITTKO scRM>Us.SurrUKA 41AHUs*iuRsR LJSLiJS Qia Lrc~r LJS LJS MS~4"8:<<4 35 37 40 41 44 41 CAUSa DESCRIPTION ANO CORRECr IVE A~rONS Q34 o The 18 char in um suction r s d ih" leakin relief valve.An electri in er k as a zero-ressure indication and revented the um from startin.The valve was re aired the a e was vented and the u was o crated satisfactoril 44 7 3 9 SACILI.Y'ip QQUr8~r'~3 10 Il IS 44 A~VITY COHTKNT SKLKASKO CI'ELEASE AMouHT OF ACTIVITY Q3%[~I j}Z Qas~ZQS NA 7 10 Ir r asoHHEI SArosusss~010'rOrr~Z 5 I I Is 13 rSRSCHHKL IHJURIE3 VLMSKR SESCRISTICHQAI

~rir~00 018 3 I I Il ss cs cR aAMAOR~a FAC: UTY&48 Yr 3 OKSCRISTIOH 9~ZQl 3)'0 rUSLIC~ssuxa 5EscRIr Tlcy GS KZ3 LKQ44 3:0 METIICO CS CISCOVKRV+A'Q 45 NA NA NA OISCOVKRV 0%$CRISTICH Qol 0 erator Observation LocATloy os RELEASE Q3%NA NRC USc ONI.Y SS SJ 30 30-'IAME OF PRcPARcP.th.A.Scho man PMDNSI 305 552-3802 REPORTABLE OCCURREHCE 335-78-40 LICENSEE EVENT REPORT PAGE TWO Additional Cause Descri tion and Corrective Action The cause of the occurrence was the untimely operation of an electric interlock on the pump suction pressure gage.The purpose of the interlock is to prevent the pump from starting if suction pressure is too low.It has been.determined that, prior to this Reportable Occurrence, the suction pressure gage had been operated beyond its normal range and"pegged high".The next time a pump start was attempted, the electric interlock interpreted the overtravelled,or pegged-high, position of the suction gage as a zero-pressure indication and prevented the pump from starting.The suction pressure gage was pegged high because of a leaking relief valve on the discharge side of the pump.The relief valve relieves back to the suction side and had been leaking the previous time the pump was operated.The leaking relief valve had allowed pressure pulses to be transmitted back to the suction side of the pump.These pressure pulses caused the suction pressure gage to peg high.The relief valve was repaired and the suction pressure gage was vented to normal suction pressure.The lB charging pump was then started and operationally checked satisfactorily.