ML20083F556
| ML20083F556 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 12/22/1983 |
| 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, DS-414-83-17, SD-414-83-17, NUDOCS 8401030160 | |
| Download: ML20083F556 (3) | |
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!Ddxn POWER GOMPANY P.O. nox 33180 CIIAHI.OTTE, N.C. 28242 HAL H. TUCKEH TELEPIRONE
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i (704) 373-4531 wwa emessorwr vl983 mun... -um-i Mr. James T. O'Reilly, Regional Administrator U. S, Nuclear Regulatory Commission Regica 11 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303 Re: Cateuba Nuclear Station Units 1 and 2 Docket No. 50-414
Dear Mr. O'Reilly:
Pursuant to 10 CFR 50.55e, please find attached Significant Deficiency Report SD 414/83-17.
i Very truly yours, WR GL.dd
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Hal B. Tucker LTP:dyh 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 NRC Resident Inspector Mr. Robert Guild, Esq.
Catawba Nuclear Station Attorney-at-Law P. O. Box 12097 Palmetto Alliance Charleston, South Carolina 29412 2135h Devine Street Columbia, South Carolina 29205 i
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ge CATAWBA NUCLEAR STATION REPORT NUMBER:
SD-414/83-17 REPORT DATE:
December 22, 1983 FACILITY:
Catawba Nuclear Station Unit 2 IDENTIFICATION OF DEFICIENCY:
Special welding bosses were installed instead of special welding boss restrictors.
This deficienty was identified by Nonconforming Item 17404 on October 27, 1983.
INITIAL REPORT:
Du November 22, 1983, Greg Niejfelt, NRC Region II, Atlanta, Georgia was notified of the deficiency by S D Alexander, R D Carroll, L M Coggins, and T L Utterback of Duke Power Company, Charlotte, North Carolina.
COMPONENT AND/0R SUPPLIER:
Fabricated by Duke Power Company, Catawba Nuclear Station.
DESCRIPTION OF DEFICIENCY:
As reported by NCIR 17404, three special welding bosses were installed instead of three restrictor special welding bosses which were specified on the Design piping drawings.
One item was discovered during the final QA review of the process control for weld number 2 Nil 27-12.
The other two items were discovered during a review by Mechanical Technical Support of similar process control to determine if this same problem existed in other instances where the Design piping drawing specifies the use of a restrictor special welding boss. All three discoveries were made after special welding boss installation and inspection by QC.
The initial errors were made by tha draftaman uhan the mnrarial lot nmabers were assigned on the bill of materials of the Construction isometrics. These lot numbers are placed on the isometrics for warehousing inventory control identification.
Neither the Isometric Draf tsmen's nor the }bterial Systems Technicians' reviews discovered the errors. The assigned lot numbers were for special welding bosses (3M2FT419A076) instead of restrictor special welding bosses (3M2FZ419A0J6).
Although, the description portions of the isometrics' bill of material did specify the restrictor type, the warehouse personnel issued the material to the craf tsmen based on the lot number.
When the craf tsmen fit-up the special welding bosses, the errors were not discovered.
The QC Inspector should have discovered the errors during the fit-up inspections but did not.
The fit-up inspection is based on the material description on the isometric,
se Page 2 not the lot number.
It cannot be determined who the pipe fitter (s) was or why the errors were not discovered. An interview with the involved QC Inspector did not reveal why these items were missed.
Each of the three bosses was in-stalled in the Pipe Fabrication Shop with the same QC Inspector performing the j
fit-up inspections.
Although these three items were discovered as a result of the QA final review of process control, this type problem would not normally be found at final re-view because that part of the review is performed by comparing the material lot number listed on the Construction isonetric to the lot number of the material whose heat number is recorded on the process control form. Although the compari-son of lot numbers is performed during final review as an additional check, it is not intended to be the official material verification. The official material verification is performed by the QC Inspector during installation.
In the case I
of the first item which was discovered, the material lot number had been revised at a later date on the Construction isometric to agree with the isometric's ma-terial description (i.e., restrictor type) without a check being made to see which type had been installed. As a result of that revision, the lot number discrepancy was found during QA final review.
ANALYSIS OF SAFETY IMPLICATIONS:
If this deficiency had remained undiscovered, the result would have been fail-ure to meet the design criteria required for transition from Class 1 to Class 2 piping.
In this case, the design and construction of the line was reviewed and found to meet Class 1 requirements through the first normally closed isolation valve. Therefore, no unacceptable safety implications would have resulted.
CORRECTIVE ACTION:
The special welding boss reatrictors have been installed as required by design drawings. All restrictor special welding boss applications have been reviewed by Technical Support and one additional discrepancy was found (and documented on NClR 17679).
It also was installed in the Pipe Fabrication Shop but a dif-ferent QA Inspector performed the fit-up inspection.
Investigations show this problem to he isolated to restrictor special welding bosses due to unf amiliari-ties with the materials and the very close similarities of the materials and their lot numbers. The Draftsmen and Material Systems Technicians have been trained concerning these errors.
In addition, all the appropriate craftsmen, Technical Support personnel, and QC Inspectors will also be trained by January 16, 1984'.
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