ML20064F111

/01T-0 on 781106:while at Pwr Feedwater Control Sys Failure Resulted in Reactor Low Level Transient & Scram HPCI Initiated But Delivered Unstable Flow & Soon Tripped on Overspeed.Cause Was HPCI Governor Being Out of Calibr

ML20064F111
Person / Time
Site:	Peach Bottom
Issue date:	11/20/1978
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
Shared Package
ML20064F108	List: ML20064F107 ML20064F111
References
LER-78-021-01T, LER-78-21-1T, NUDOCS 7811280230
Download: ML20064F111 (1)

Text

'IC FORM 366 U.S. NUCLE AH OLGULATOln CUW.tl5SION

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. * *Unit *3 LICENSEE EVENT REPORT deport No. 3-70-21/1T CONTROL BLOCX: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION1 8 6 o Iii8 le l ALICENSEE lP lBCOGY lS l3 l @l Ol 0l l0 l 0l 0l Ol 0],-l O! OI@l 4 l 1 l 11 Il 1l@l l I@

9 14 15 LICENSE NUY8EH 25 26 LICENSE TYPE JO 67 CAT 68

.ON'T olil ,"$,"c[lLl@[0l5101-l0l2l7 18 @l1 l1 JO l6 l7 l8 @l 11 il 2l 017 l B 80l@ 75 8 60 69 DOCKET NUMSE R 68 69 EVENT DATE 14 REPORT DATE EVENT DESCRIPTION AND PROGABLE CONSEQUENCES h o 12 l l While at power, a feedwater control system failure resulted in a reactor I h i3I I low level transient and scram. HPCI initiated but delivered unstable 1 o 14 l l flou. Within minutes HPCI tripped, apparently on overspeed. Attempts to  !

'o Is l I manually restart HPCI were unsuccessful until its auxiliary oil pump I 10 l6 l l Was removed from service and restarted. Rated HPCI flow was attained. l

.ol7ll Safety significance was minimal, since RCIC initiated and delivered l

q l rated flow, and ADS, CS, and LPCI were available.

80 I

y SYSTEM CAUSE CAUSE C O*A P. VALVE CODE CODE SUSCODE COMPONENT CODE SU8 CODE SUSCODE nl91 u

[S lF l@ ]@ l Xl@ lIlN l S lT lR lU l@ l Cl@ lhZl@

t IC 14 12 13 1R 19 .

,_ SEQUE N TI AL OCCURRENCE REPORT REVISION LER/Ro EVENT YEAR REPOnT NO. CODE TYPE NO.

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21 22

(_l 2J l0l2l1l 24 26 l/l 27 l Ol 1l 28 29 lTl 3J

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31

.d 32 AK N A T ON ON PLANT MET HOURS SUD i FOf 9 UB. SU PLI MANLFAC RER Le_]@lc 33 J4 l@ l35C l@ LZJ@

36 101010161 31 40 I41 v i@ l vi@ l Nl@ ,Wl2l9l0l@

42 43 44 47 CAUSE DESCRIPTIC.,N AND CORRECTIVE ACTIONS h T[Tll HPCI governor (Woodward Model 8271-083)out of calibration resulting in i

.ii,l l unstable flow and overspeed trip. Defective valve found in overspeed trip l Tr - ' l_ reset circuit. Governor calibrated -operability verifiec. salve repaired- l 7i q l auto reset circuit tested satisfactorily. Governor alignment procedure to l i g ., g l be revised to include dynamic stability testing following calibration. I 8 9 80

• SCOV RY ST PoWE R OTHER STA TUS DISCOVEftY DESCniPTION

' l A l@l Operator Observation l l I 5 l l X l@ l Oi 0 l 0l@lPX Low Level Scraid ACTIVt TY CONTENT R6LEASEn OF RELEASE AMOUNT OF ACTIVITY LoCAf TON OF etELEASE l t

l68 l9 W @ l Zl@l NA l l NA l  ;

10 tt 44 45 80 PEnSONNEL F KPoSunES ,

NUP/B E R TYPE DESClitPTION t l 7 l l 0 l 0 l 0 l@l Z l@l NA l ,

,E R $oNN E L',mu'A ES i

Nansn otSCniPriON@

1 18ll0l0l0lh!

8 9 It 12 NA -

80 i

LOSS OF Oft OAMAGE TO FACILITY T*PE DESCntP TION i  !

I o l Lz.J@l NA.

8 9 10 80 PUR L tC1 TY i

NPL USE ONLY *

( 'SSUED

> 1 o 1 DU8l DESCRIPTION NA  !'1 _ l llll!ll1ll lll1 8 9 to /**/6' f /9 68 69 80 5 '

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