ML19275B591
| ML19275B591 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 11/20/1979 |
| From: | Boyd D, Kohler J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| References | |
| PNO-III-79-043, PNO-III-79-43, NUDOCS 7912180090 | |
| Download: ML19275B591 (1) | |
Text
Y PRELIMINARY NOTIFICATION Da t.c
- NOVe*b"r O, 19 79 PREL1hlNARY NOTITICATION OF EVENT OR UNUSUAL OCCURRENCE--PHO-III-19-43
_This preliminary notification constitutes EARLY notice of events of POSSIBI.E safety or public interest significance. ~ ~The infomation presented is as initially received without verification or evaluation and is basically all t.ha t. is known by IE staf f on this date.
F.ici l i t2:
%,monwer4 l a h EdI non Company, Zt on Unit 1 (DN 50-795)
- 7. I n n, T11innia Sub ice t :
CRACKS I'; t rM PRGSURE TilRRThT. DTSKS During the overhaul of the unit I low pressure turbine, cracks or indications have henn found in' the D and C Gect.iun Dices.
On November 14, 1979, crack indicatipna vere found in the B section Nu.ber 2 disks and on November 20 1979, two cracks i ere Iound in the C s ec t 3 0o L mber 1 disks.
The c.rackA tonnd in the. C A e.r t i on Numb er I disks are each approxi wtely one inch spindle it length and at e located near the shaft.
According Lu the licensee a new sill lie requir ed for y m..ncor repa i r, or a remporary repai r rnay be poedible by currinp, nur parr nt the diska and rehalancing the. AhAtr_.
Tt is en rirnated r.ha r the temporary repair vill take six to seven vecks or the pcmanent repair will take n ~. to rhrer wenthn.
The licenner in currenriy nr.rrmpting tn 1nrate n rep 1ncement spludie.
Tine licensee eM L i tu lex litM L LhlN repair effurL will exLend Lhe presenL refueling outage by a ini=u= of.21 days (outage now estimated at 85 days as oppuued Le original uchedule of 64 dayu).
l'hc liccasce docs not plan to iuuuc a presa releaue at thiu time.
The State of Illinuiu is being nutified.
Thiu informa tion in current us of 1:00 p.r..
un November 20, 1979.
h j
N h*
6 J.
t;. n hier, nasident Inspector, 312/746-2321; u, C. Bo
- nili, Contset:
1M-2 C.4 6 Distribution:
Transmitted H St Chairmeu Heudric Cummissioner Bradford S. J. Chilk, SECY Coc,issioner Kennedy Commissioner Ahearne C. C. Kamme.rer, CA Co==issioner Gilinsky ACMS (For Distribution)
Tranmi r.ted:-- MGR P. Bldg --
IE:X005 - - (IE: HQ Dist. _
L. V. Co x x i ck, EDO H. R. Dent.on, NRR H. L. Ornstein, EDO R. C. DeYoung, NRR J. J. Feuchard, PA R. J. Mattson, NRR Laudos (6 miu/page)
N. M. lial l e r, ifPA D. Vassallo, NRR' -
J. J. Cuosings, OIA-R. G. Ryan, OSP
- f. Eisenhut, NRR H. K. Shapar, El.D
[5,5 Bldg (HATT.1 V. J. Dircks. NMSS R. Hinogue., SD.
S. Levine, RES IE:XOOS
< 91218o OTO PRELIMINARY NOTIFICATION