ML20211C615
| ML20211C615 | |
| Person / Time | |
|---|---|
| Site: | 05000000, Diablo Canyon |
| Issue date: | 06/10/1983 |
| From: | Schierling H NRC |
| To: | Eisenhut D NRC |
| Shared Package | |
| ML20209B155 | List:
|
| References | |
| FOIA-86-151 NUDOCS 8610210449 | |
| Download: ML20211C615 (2) | |
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UNITED STATES c'
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'o NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555
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NOTE T0: Darrell G. Eisenhut FROM:
Hans Schierling PG&E and Diablo Canyon Project management (G. Maneatis, H. Friend et al.)
would like to meet with you to discuss:
1.
schedule 2.
pre-op and hot functional test 1
3.
otherissuesandrequirements(CCW,Superstrutetc.)
I reserved Friday, June 17,1983 at 9:00 am on your calendar.
I do not think this should be a meeting going to other parties. Please advise what NRC staff should attend and confirm.
M Hans Schierling cc:
T. Novak G. Knighton L. Chandler B. Buckley l
A. Vietti PDR FOIA HOLMES86-151 PDR l
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- PRfLINHARY. NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-V-83-22AY Da,te:% %
a a/cPE This preliminary notifit ation constitutes EARLY notice of events of P0$$1BLE sa or pubi.;
interest significance. The information is as initially received without verification or evaluation and is basically all that is known by IE staff on this data.
FAc1LIIY: Pacific Gas & Llectric Company Diablo Canyon Unit No.1 Notification of Unusual Event -
Docket No. 50-275 San Luis Obispo County, Llifornia
-_Al ert SUDJCCT:
POTENTIAL VIOLAfl0N OF MINIMUM WALL THICKNESS ON RFACTOR COOLANT SYSTEM P! PING General Emergency X Not Applicable On June 22, 1983, licensec personnel determined that the RCS piping in areas of welds other than reported on May 10, 1983 may bc less than the minimum wall thickness specified by code. A total of ten welds in cold leg, hot leg, and cross over (between steam generator i
and reactor cnnlant pump) piping appear to be less than required minimum wall thickness.
The condition was discovered while performing additional ultrasonic examinations at cach 4b degree increments around the welds. The tests were to he used to improve the quality of the basc-line preservice examination. The licensee identified the additional problems after determining that incorrect minimum wall thickness criteria had been applied to the hot legs and cross over piping. All four RCS loops are involved. The reduction in wall thickness appears to have occurred during the original preservice examination (1975-76) when welds were ground smooth to remove thu potential for irrelevant indications when performing ultrasonic and/or radiographic examinations. The licensec plans to take additional thickness measurements at 3-inch circumferential stops around the welds to detemine if any other minimum wall thickness conditions exist.
Region V will closely follow this situation.
Media interest is not expected. Neither the licensee nor the NRC plans to issue a news release at this time. Region V (San Francisco) received notification of this occurrence from the Resident inspectors at about 11:00 a.m. on June 23, 1983. This infomation is current as of 2:00 p.m. on June 23, 1983.
CONTACT:
D. F. Kirsch 463-3723 U151RIBUTf0N:
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.. MMBB i Phillips E/Wf_i2D Willste Air Rights Mail:
Chaiman Pal' adino EDO NRR IE NHSS-ADM:0MB Com. Gilinsky PA OIA RES 00T: Trans Com. Ahearne MpA AE00 Only Com. Roberts ELD Com. Asselstine Regions:
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CA (Reactor Uc' ens'Es)
REGION V: FORM 21 PDR Resident Inspector _ _
(revised 3/14/83)
.N W NO
]i CENTER FOR LAW.
IN THE Pustic INTEREST
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=- g-u-N Harold Denton Director of Nuclear
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U.S. Nuclear Regulatory Commission Q
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Dear Mr. Denton:
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"IDVP")
Since the Independent Design Verificati
- P for Diablo Canyon Nuclear Power Plant ("Diablo Canyon") was instituted by the Commission eighteen months ago, the question of the independence of the auditors has been a continuing concern of the Joint Intervenors and other interested parties.
Without such independence, the audit and its findings will do little to restore lost public confidence in the design and construction of Diablo Canyon and the effectiveness of the Commission's licensing review process.
I am writing on behaif'.of,th,e Joint Intervenors to relate to you a discussion at a recent IDVP meeting which provides disturbing evidence of Pacific Gas and Electric Company's
("PGandE") continuing failure to appreciate either the meaning of or the necessity for such independence.
Specifically, our' concern arises out of the June 14, 1983 meeting at PGandE's offices in San Francisco between the Diablo Canyon Project
("DCP" or " Project") (the PGandE/Bechtel licensing team) and the IDVP regarding the status of certain Error Open Items
("E0I"), in particular EOI File No. 1132 (Auxiliary Building Corrective Action Program).
The EOI' in question (a copy of which is enclosed) concerns the DCP's f ailure to report that auxiliary building slabs at Diablo Canyon have not been qualified for in-plane loadings, des'ite the fact that the joint DCP/IDVP Schedule, EPS-816A p
Revision 3, dated May 16, 1983
(" Schedule"), clearly stated that the DCP has completed auxiliary building member SOARD OF TRUSTCCS C" r 1.
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