ML19350C441
| ML19350C441 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 02/20/1981 |
| From: | Robert Carlson NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| References | |
| NUDOCS 8104010729 | |
| Download: ML19350C441 (1) | |
Text
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UNITED STATES 8'
D NUCLEAR REGULATORY COMMISSION r,; *-
c REGION I
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631 PARK AVENUE C'
KING OF PRUSSIA, PENNSYLVANIA 19406 Docket No. 50-352 FES 2 01981 50-353
@N Philadelphia Electric Company
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j ATTN: Mr. John S. Kemper Vice President c
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Engineering and Research
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G pol A V 2301 Market Street O
Philadelphia, PA 19101
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Gentlemen:
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Subject:
Improper Welding of RPV Safe Ends - SDR No. 27 Thank you for your letter, dated January 16, 1981, which forwarded an interim report pursuant to 10 CFR 50.55(e) regarding the subject matter.
This matter will be reviewed following receipt of your final report in April 1981.
Your cooperation with us is appreciated.
Sincerely, d
s Robert T. Carlson, Chief Reactor Construction and Engineering Support Branch cc:
V. S. Boyer, Senior Vice President, Nuclear Power 8
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PHILADELPHIA ELECTRIC COMPANY p
g 2301 MARKET STREET P.O. BOX 8699 1881 -1981 PHILADELPHI A. PA.19101 JAN O l98l r21si e414so2 JOHN S. KEMPER vicaretssoENT c.................
Mr. Boyce Grier, Director Office of Inspection and Enforcement, Region I United States Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406
Subject:
Interim Report For Possible Significant Deficiency Deficiency No. 27 - Improper Welding of Reactor Pressure Vessel Safe Ends Limerick Generating Station, Units 1 and 2 NRC Construction Permit Nos. CPPR-106, -107
Reference:
Telecon of December 18, 1980 H.
R.
Waltors (PECO) to J. Mattia (NRC)
File:
QUAL 2-10-2 (SDR #27)
Dear Mr. Grier:
In compliance with 10CFR50.55 (e) we are hereby submitting this interim report on the subject welding.
Philadelphia Electric Company discussed this subject with your office by telecon on December 18, 1980 after it was determined that this situation may be reportable to the USNRC.
On December 17, 1980, Philadelphia Electric Company became aware that certain welds between the reactor pressure vessel nozzles and the reactor pressure vessel safe ends were welded using welding practices which deviated from the approved Installation Procedures.
This welding practice involved making partial weld passes 1
without feeding weld material (wash pass), followed by spray or mist application of water tc accelerate the cooling process and thereby facilitating alignment.
It has been determined that on five velds this practice was definitely used.
There is a possibility that this has occurred on up to thirty-five other Unit 1 and Unit 2 RPV safe end to RPV nozzle velds.
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StolaGo500
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Upon identification of the subject deficiency, the following actions were taken:
All welding of the RPV safe ends to RPV was stopped.
The welders and the subcontrac' tor's personnel were interviewed to determine the extent of the problem.
Nonconformance Reports were written to identify the conditions..
Appropriate disciplinary actions were taken against the individual responsible for directing the welding.
The inspection procedures were revised to establish a Quality Control Hold Point for all future control of welding used to achieve alignment.
General Electric Company, the NSSS supplier,has been requested to perform analysis of the acceptability of the welds in question.
It is expected that General Electric Company will have completed their evaluation during the month of February.
The determination of the need for additional examinations or tests should be completed during the month of March.
It is estimated that PECO will submit a detailed written final report by April 15, 1981.
Sincerely, f
cc:
Director of Inspection and Enforcement United States Nuclear Regulatory Commission i
Washington, D.C.
20555 J.
P.
Durr, Resident NRC Inspector t
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