ML16340D382
| ML16340D382 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 06/20/1983 |
| From: | Eisenhut D Office of Nuclear Reactor Regulation |
| To: | Ahearne J, Gilinsky V, Palladino N NRC COMMISSION (OCM) |
| References | |
| TASK-AS, TASK-BN83-073, TASK-BN83-73 BN-83-073, BN-83-73, NUDOCS 8305110488 | |
| Download: ML16340D382 (12) | |
Text
p C)-
JUN 2 p 1983 Docket Nos.:
50-275 MEMORANDUM FOR:
FROM:
SUBJECT:
Chairman Palladino Comoissioner Gilinsky Commissioner Ahearne Commissioner Roberts Commissioner Asselstine Darrell G. Eisenhut, Director Division of Lice)ising Office of Nuclear Reactor Regulation INFORMATION ITEt1 REGARDING POTENTIALLY INADEQUATE WELDS IN COMPONENT COOLING HATER PIPING SYSTEM AT DIABLO CANYON, UNIT 1 (Board Notification No. 83-73)
J In accordance with present NRC procedures for Board Notifications, the following items are enclosed for information of the Commission:
1.
Pacific Gas 8I Electric Company's letter dated Hay 9, 1983 2.
Preliminary Notification - PNO-V-83-21 dated May 10, 1983 The enclosures provide information in regard to the potential for inadequate welds in the component cooling water piping system at Diablo Canyon, Unit l.
Region V is currently examining the licensee's response to this incident.
Me will promptly inform you of any significant findings on this matter.
The board and parties have been notified of this informa 'on.
Darrell G. Eisenhut, Director Division of Licensing Office of Nuclear Reactor Regulation
Enclosures:
As stated cc w/encls:
See next page
Contact:
B. Buckley.
NRR xt. 28379 OFFICEIF SURNAME/
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DISTRIBUTION LIST FOR BOARD NOTIFICATION Diablo Canyon Units 182 Docket Nos. 50-275/323 OL Ms. Elizabeth Apfelberg Mr. Richard E. Blankenburg Mr. Glenn 0. Bright Mr. Herbert H.
Brown Dr. John H, Buck Philip A. Crane, Jr.,
Esq.
Mr. Frederick Eissler David S. Fleischaker, Esq.
Mrs.
Raye Fleming Arthur 6;-Gehr, Esq.
Mr. Mark Gottlieb Mr. Thomas H. Harris Mr. Richard B. Hubbard Dr.
W.
Reed Johnson Janice E. Kerr, Esq.
Dr. Jerry Kline Mr. John Marrs Thomas S. Moore, Esq.
Bruce Norton, Esq.
Joel R. Reynolds, Esq.
Mr. James
- 0. Schuyler Mr. Gordon Silver Michael J. Strumwasser, Esq.
Paul C. Valentine, Esq.
Harry M. Willis John F. Wolf, Esq Atomic Safety and Licensing Board Panel Atomic Safety and Licensing Appeal Panel Mr.. Balcolm A. Furbush Resident Inspector/Diablo Canyon NPS Dr. William E. Cooper Mr.
W.
C. Gangloff Mr.
Owen H. Davis Dr. Jose Roesset ACRS Members Dr. Robert C. Axtmann Mr. Myer Bender Dr.
Max W. Carbon Mr. Jesse C. Ebersole Mr. Harold Etherington Dr. William Kerr Dr. Harold W. Lewis Dr. J.
Carson Mark Mr. William M. Mathis Dr.
Dade W. Moeller Dr. David Okrent Dr. Milton S. Plesset
,Mr. Jeremiah J.
Ray Dr. Paul C.
Shewmon Dr. Chester P. Siess Mr. David A. Ward 4
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of'he l$ne ms subagent)g.drained tp fac$ 7$tete cxaa$ raCfon.
Ntraeonfc axaafnat$ oa aef NwaluatfoA of dtI eo the sM'far isolde KChmrC a reTaforceeaoc ~d ~s eceqAeted ce ICaj 0, C5M.
Thai VT exaadret$ on and)cate4 the peeefbf+cy that a f'u'll peeetrat$ ee step ee'lc.me cut cede ag requfred by thb applicable pkpfog cM>
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~ovest$ gat$ on Ig ccec~nuI~y.. TMs vs~) ~~ js ba~~y unde urger Yeehafcal Spacfffcetfce 5.9.1.XR.4 Nth tie p'Want,fa )A present conf(ysraUcN (4.4.>
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<Ms condft)On pOSeS te that tO the health act safetV Of %ha pub~fC.
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":.ThH preIieinary notification constitotes EARt Y notice or events or yUSSIBLE safety or public interest significance.
The information is as initial)y received without verification or evaluation and is btsieally all that is known by IE Staff on this date.
s FACILITY: Pacific Gas K Hectic Caaeany Diablo Canyon Unft 1 Docket Hos.
50-275 San Luis Obispo County; Ca()forn)a SUBOECT:
POTENTIAl.LY, INADE(gATE TELOS IN QNPONENT COOLING NTER PIPING SYSTBl LceBergencg Classi f ication'>tificasion of Uni!seal Event n!ert Si tc Arei Eneroency uencrai E!ncrgcncy Not Applicable On April 29s 1983, while mlding a reiC'~~t pad on a p'lant.line connected to Loop C (non-safety-related) of the cenponent cooling wter systee, a-leak ms observed-.
This section of the line was drained to facial)tate further examination.
Ultrasonic (UT) examinations of this and several similar fields; Mahout re)nforc~nt pads, were completed on Ray 9, 1983.
The UT examinations
)ndicated the possiLiikty that full penetr~tion welds mre not made.
The leaking mid ms in a pipe spool fabricated at the Paramount, Ca1ifornia shop of Pullman Power Products and manufactured to the reqvireaents of JV51 831.7.
The licensee reported that nondestructive examination (NDE) records exist at the site for all fields
)n the pipe spool, excePt the one wkid observed to be teaking, and that action has been initiated to require Pul lean to.produce YDE records for the we/d in question.
The l)censee intends to cvt out a section of pipe containing the we/d and perforu visual and HOE on the weld to verify full penetration and weld integrity.
The licensee
- examined, by UT, eight siailat iejds in safety related portions of the cociponent cooling water system and observed sinilar=indRations of lack of full penetration.
The licensee is questioning the validity of.the UT examination results due to the snail (0.22 inches) wall thickness and intends to i.stab)ish val)d)ty based upon visual and nondestruetiVh examination of the leaking Mid.
Region V will folly this situation to resolut/on.
The licensee made a preiyt report on Wy 9, 1983, pursvant to Technical Specifications requ)reagents.
Had)a interest nay occur.
Neither the licensee nor the NRC plans to issue a news release at this tice, however the licensee has prepared a news release in the event of media interest.
Region V (San Francisco) received notification of this occurrence from the Senior Resident Inspector at about 2 p.ia.
PDT on Hay 9, 1983.
This information
$ s current as of 9.00 a.m, on Hay 10, 1983.
CONTACT:
D, F. Kitsch, 463-3723 DISTR I BUTIOH-H St.
Cha radian a
a no Coom. Gilensky Coca.
Ahearne Co~. Roberts Com. Asselstine SECY man Ph)llips EIM MHlste NRR IE te65 PA OIA RES
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