PNO-III-80-219A, on 801126,reactor Tripped Twice.Caused by Closure of Main Feedwater Regulating Valve.During Refueling Outage,Licensee Conducted Nondestructive Testing of High Stress Areas of Feedwater Piping
| ML20003A184 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 01/02/1981 |
| From: | Culdemond W, Heishman R, Warnick R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| References | |
| PNO-III-80-219A, NUDOCS 8101300743 | |
| Download: ML20003A184 (2) | |
eeav n.m e AttaL.nment 2 1
l Ette:
1-2-El Y
NLpquAP.Y NOTIFICAT JON Or EVENT OP. UNUSUAL OCCURECI--Pn0-1:1-ea-219^
.P Pcge 1 of 2 1
.T.his tireliminary notificati.on.- tenstitutes EARLY notice of events of POIS?oi r rafety or oublic interest 51cnificance.
ine infor:.ation Dresen.ec is es
~
init1sily recet t ed without ver1f testien or evt.lun:1on Ent is besittilv Til
_ htt 1s known by TE staff ar. of tnis este.
Facility: Wisconnin Klactric Power Company Foint Beach 1 (Docket No. 50-266) wo Creeks. WI 8
Rubj ect:
REACTOR TRIPS CA115ED EY C1.051'RE OF THE R.AIN FIEDWA"'IR REGl'IATING Vjd.Yr Thi: ? c11=1nery U :liication is zn upda:e of In.:0-I:1-EO-219 iscued Koverbar 25, i
ic80.
Follouing two res: or trips en Novc=ber 26, 1"$0, crured by the closure cf the
"!." tusin feedeater reculating valve which rest 1 Led in low level in the "t." steen gen:rstor, t' nit,l rc=sined shutdown anc the licensee en:cred the refueling ou age -
cri;in:11y ocheduled to begin on November 26, 1960.
Nring the refuelinn outage the licensee condocred non-destructive restint of the h-gh vtress areas of the.feedwater piping.
No probiere.> xere identified.
Tne licensee opened and visually er.a:ained the feedeater regulatine valves, the hi:h pressure fecdtcr:er heaters, cnd the pt=: disch rge chech vcives.
!'ie:cs of h:rdware (nu c) identified os enming from the high prennure feedyn.nr henrer finv divider ucra fo d '- -he "E" f eedenter result:1ng valve din guide ce;;t.
Piccar of vr. :
..ppeared to be a bushing were found in the inlet plenum o' the SA feedvarer henter.
T.51 dise pire: hushtn;;A on the dircharge eneth velv: f:r the "A"
.r.in feer.vt c punp vere found vorn and broken ar.d h:ve been rep 1: ced.
The pieces ef bushit; ruterial fo_nd in the f eedwater heater, eenbined with a siniist piece found in :he reze loca:1cn 1: 1973, and what rc sined i: the ::in fced re:? che:li v.1va, naie a.
ecepin:n hunhing nunnably.
Tr. van ninn noted r.hn: the mechanical cpen :::p n
fer the "A" + *'eedvater pu p dizeharge chech v 1Tc was cignificantly vern ::d nts been repaired.
"he licensee is attributin;; the feed cyste vibratione t.nd mechanical un:cr t.
rer to flov escillations set up by the dive on the "A" mein feed pump dischcrne check valve.
The refueling outage was comple.!e.d and the reactor vent critical at 13 :18 a.c. en Dece ber 23, 1980.
Af ter co=pletin:; 107 por r pn';:ics c::ing :ne uni: increr, ct.
poorer on Dece=Ser 31, 1980.
The recident inrpectors hsve hapa ohnavvinr, the yob D
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1_;-81 the fecdveter lincs during tbp,, power esccletior..
The rcatter is currently
'nt rcr.ning pnwer en EO:;.
(Utitt limited tn 800 power by r.r. cam e nnerator pre.r.e.wr.td on prop. ram).
& sintinttA1 vihrAttenn, have he.an chna ved Ainca tha xtartup.
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~his ?!? is bein;; issued f or infehatien and close out of ?KO-III-80-219.
This infomation is current an of 9:00 a. :.
Jr.nuary 2,19E1.
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Realde[ntInsp.
W. G.
.yldenood R.-F.
h tnich, Eli!
R. T...... n En, R II
Contact:
e 312/932-2505 312/932-2540 411./755-2309 i
l'ir ribution:
Transmitted W St 76 /
Ln'iman Ahearne Commissioner Hendrie S. J. Chilk, SEC7 C., ::i:sioner Gi linti y Counissiuuer Bradford C. C. h:::e re r, CA ACKS
(?or Dietribution)
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