ML20080G558
| ML20080G558 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 09/02/1983 |
| From: | Tucker H DUKE POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, SD-414-82-25, NUDOCS 8309200312 | |
| Download: ML20080G558 (3) | |
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/ Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region 11 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303 Re:
Catawba Nuclear Station Unit 2 Dccket No. 50-414
Dear Mr. O'Reilly:
Pursuant to 10 CFR 50.S5e, please find attached a Final Response to Significant Deficiency Report SD 414/82-25 Very truly yours,
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se Hal B. Tucker RWO/php Attachment cc: Director INPO Records Center Office of Inspection and Enforcement Suite 1500 U. S. Nuclear Regulatory Commission 1100 Circle 75 Parkway Washington, D. C. 20555 Atlanta, Georgia 30339
- RC Resident inspector Mr. Robert Guild, Esq.
Catawba Nuclear Station Attorney-at-Law P. O. Box 12097 Palmetto Alliance Charleston, South Carolina 29412 2135{ Devine Street Columbia, South Carolina 29205 op!c15 cod.,
8309200312 830902
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CATAWBA NUCLEAR STATION REPORT NO:
SD 414/82-25 REPORT DATE: September 2, 1983 FACILITY:
Catawba Nuclear Station Unit 2-IDENTIFICATION OF DEFICIENCY:
incomplete penetration has been identified on open root Class 3 (ASME Section lil, Subsection ND) circumferential butt welds by Welder #600.
These Joints were welded with the GTAW process.
Prior visual inspection and NDE of the outside surface indicated these welds were acceptable.
These welds did not require radiographic examination.
INITIAL REPORT: On November 22, 1982, Mr J C Bryant of NRC Region 11, Atlanta, Georgia, was notified of this deficiency by Mr W 0 Henry, Mr S H VanMalssen, and Mr R L Williams of Duke Power Company, Charlotte, N.C. 28242.
This notification was in response to Nonconforming item
- 15745 The initial written report was filed January 31, 1983 DESCRIPTION OF DEFICIENCY: Upon removal of two (2) temporary caps in the Unit 2 Refueling Water System (KF), the roots of three (3) Class 3 welds made by Welder #600 became accessible for visual examination.
They were discovered to have extensive incomplete penetration on the root side (Weld prep on the i.D. had never been consumed). Ten (10) other welds made by Welder #600 on 2KF system were cut and visually examined.
All of these exhibited incomplete penetration to varying degrees.
Further examination has revealed this problem occurred throughout Welder #600's open butt Class 3 welds that did not receive ar. l.D. Inspection.
(124 were radiographed, 81 had some indication of incomplete penetration).
However, the most severe indications (LxWxD) occurred on the Unit 2 Refueling Water System. The dimensions of these most severe cases of lack of penetration were provided to Design Engineering for Analysis of Safety implications.
ANALYSIS OF SAFETY IMPLICATIONS:
The following analysis was provided by Design Engineering.
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Design Engineering has performed additional analysis on the welds in question. This analysis factors in the lack of penetration found in these welds.
Based on this analysis, the stresses in the welds were found to be in excess of Code Allowables.
Had this condition gone undetected, our margin of safety would have been reduced and the func-tion of the system possibly impaired.
CORRECTIVE ACTION:
(1) All GTAW Performance Qualifications of Welder #600 were removed when this problem was identified.
Upon further investigation, Welder #600's employment with Duke Power was terminated.
(2) A radiographic inspection of all 124 welds in the scope of this problem has been completed. All welds that did not pass radio-graphy have been repaired or replaced as necessary.
(3) A training session on weld quality with special emphasis on Class 3 open butt welds has been conducted with all welders and documented in accordance with Duke Power Quality Assurance Procedure V-1.
(4) A training session on responsibility for weld quality produced by employees has been conducted with all Welding Supervisors and documented in accordance with Duke Power Quality Assurance Procedure V-1.
(5)
First line supervision in the Welding Craft have been notified they will be held accountable for weld quality produced by their employees through their performance evaluations.
(6)
Second line supervision in the Welding Craft have also been notified they will be held accountable for weld quality produced by their subordinates through their performance evaluations.
(7)
Catawba's Engineering Manager has conducted training with all members of the Welding Craft on the importance of quality workman-ship. This training included methods and suggestions for achieving high quality root passes on open butt Class 3 welds.
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