ML20070E247
| ML20070E247 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 12/10/1982 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-82 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8212170160 | |
| Download: ML20070E247 (3) | |
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s TENNESSEE VALLEY AUTHORITY CH ATTANOOGA, TENNESSEE 37401 400 Chestnut Street Tower II December 10, 1982 BLRD-50-438/81-72 BLRD-50-439/81-70 a
(M U.S. Nuclear Regulatory Commission e
Region II Attn:
Mr. James P. O'Reilly, Regional Administrator O
101 Marietta Street, Suite 3100' I
Atlanta, Georgia 30303 y
e
Dear Mr. O'Reilly:
Sf BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - WELDS BY JOHNSON MACHINE WORKS ON REVOLVING PLATFORM - BLRD-50-438/81-72, BLRD-50-439/81 SECOND REVISED FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector R. V. Crlenjak on November 6,1981 in accordance with 10 CFR 50.55(e) as NCR 1638. This was followed by our interim reports dated December 4,1981 cnd January 22, 1982, our final report dated March 9,1982, and our revised final report dated March 29, 1982. TVA's response to violation 50-438, 50-439/82-23-04 cotumitted TVA to provide additional information to clarify this report. Enclosed is our second revised final report. We consider 10 CFR Part 21 applicable to this deficiency.
If you have any questions concerning this matter, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TE ESSEE VALLEY AUTHORITY
)
. M. Mills, >$ nager Nuclear Licensing Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 gyHCDLC F212170160 821210 g# d[
PDR ADOCK 05000439 s
PDR An Equal Opportunity Employer
5 7-EMCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 WELDS BY JOHNSON MACHINF WORKS ON REVOLVING PLATFORM NCR 1638 BLRD-50-438/81-72, BLRD-50-439/81-70 10 CFR 50.55(e)
SECOND REVISED FINAL REPORT Description of Deficiency Eight welds on the revolving platform trucks, manufactured by Johnson Machine Works, Chariton, Iowa, do not comply with the American Welding Society (AWS) specification D1.1, as required by the procurement contract.
The subject welds exhibit overlap, undercut, spatter, and insufficient reinforcement.
The following list identifies the welds which were found not to comply with AWS D1.1 requirements on the unit 2 revolving platform truck.
REFERENCE JOHNSON MACHINE WORKS DRAWING 55904, SHEET 7 Weld Components Weld Defects 1.
P1. "PA" to Channel "MA" Insufficient Reinforcement (~1/16")
2.
Pl. "PC" to Channel "MA" Overlap, Insufficient Reinforcement
(,-1/16"), Undercut (,-1/32"- 3/32")
3 P1. "PJ" to Channel "MA" Insufficient Reinforcement 9*1/16")
Undercut Gs1/32" - 1/8")
4.
P1. "PM" to P1. "PP" Insufficient Reinforcement (varies from/v1/32"- 1/16")
5.
Pl. "PP" to P1. "PA" Undercut 0-1/32"- 3/32")
6.
P1. "PP" to Channel "MA" Overlap, LOFGP Weld Ties, Undercut
(*1/32"- 3/32"), Spatter, Insufficient Reinforcement 0-1/16")
7.
P 1. "PP " to P 1. "PQ" Overlap, Spatter, Undercut 0<1/32-3/32")
8.
P1. "PT" to P1. "PA" Undercut 0<1/32"- 3/32"), Welded continuous on two sides instead of intermittent as required by the drawing.
TVA has determined that the extent of the weld deficiencies on the unit 1 truck is the same as the deficiencies noted on the unit 2 truck.
The cause for deficient vendor welds may be credited to a potential vendor QA breakdown caused by poor quality workmanship and failure to define hold points for these welds in appropriate drawings / specifications and a failure of the TVA inspector to recognize the weld ceficiencies during inspections performed at the vendor's shop on these items.
w Page 2 Safety Implications The revolving platforms, which are located in each of the primary containnent domes, provide access to the Reactor Building Spray System.
Failure of the listed welds could lead to collapse of the entire structure and damage to the safety-related equipment below which could adversely affect safety of plant operation.
Corrective Action An analysia of items 1, 2, and 4 through 8 indicates that the welds are adequate as they currently exist. Item No. 3 was repaired in accordance
~
with AWS D1.1, Section 3 7.
All new welding was either magnetic particle or dye-penetrant tested. This disposition has been determined to be appropriate fcr the deficiencies noted on both unit 1 and unit 2 trucks.
All corrective action has been completed.
To prevent future welding deficiencies from going undetected, TVA has initiated a training program for Quality Engineering Branch (QEB) employces per Administrative Instruction QEB-AI 313.1 " Training and certification of QEB Personnel" to certify QEB source inspectors with the American Welding Society (AWS).
In addition, source inspectors will be allotted more time for inspection which should allow a more comprehensive inspection and detection of similar deficiencies.
NCR 1929 was initiated to identify the generic implications involved with NCRs 1463 and 1638, written against Johnson Machine Works. The recommended disposition of NCR 1929 requires BLN CONST to ir.spect all Johnson Machine Works-supplied items and report any conditions adverse to quality to TVA's division of Engineering Design (EN DES) for evaluation and disposition.
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