ML20010E779
| ML20010E779 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 08/27/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8109080251 | |
| Download: ML20010E779 (2) | |
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TENNESSEE VALLEY AUTHORITY CH ATTA,NOOG A. TENNESSEE 374ol 400 Chestnut Street Tower II
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Mr. James P. O'Reilly, Director
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Dear Mr. O'Reilly:
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BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - QA BREAKDOWN - DEFICIENT' FILLET WELDS - NCR'S 1188, 1203, AND 1563 - SIXTH INTERIM REPORT On May 7,1980, R. W. Wright, NRC-0IE Region II, was informed that nonconformance report (NCR) 1188 was determined to be reportable in accordance with 10 CFR 50.55(e). Since that time, related NCR 1203 has been determined ~o be reportable in accordance with 10 CFR 50.55(e). This c
was followed by our interim reports dated June 6, September 19, and December 15, 1980 and June 10 and March 6, 1981. Some of the affected welds are inaccessible for inspection; therefore, NCR 1563 has been written to disposition these welds. Enclosed is our sixth interim report. We expect to submit our next report by December 1, 1981.
If you have any questions concerning this matter, please get in touch with D. L. Lambert at FTS 857-2581.
Very truly yours, TENNESSEE VALLEY AUTHORITY uY L. M. Mills, I nager Nuclear Regulation and Safety Enclosure cc:
Mr. Victor Stello, Jr., Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 Tb S
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0109090251 810827 PDR ADOCK 05000438 An Equal Opportunity Employer S
ENCLOS,URE y\\
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 QA BREAKDOWN - DEFICIENT FILLET WELDS 3
l NCR'S 1188, 1203, AND 1563*
i SIXTH INTERIM REPORT l
4 Description of Deficiency Numerous fillet welds located in various safety-related systems do not meet ASME Code and/or G-29 requirements because of inadequate fillet leg size or theoretical throat dimensions. Deficient welds have been found in socket 1
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. weld fitting, socket weld flange, and component support welds. This l
quality assurance problem is attributable in part to the procedure for fillet weld inspection because it did not accurately reflect the applicable l
ASME Code requirements. Additional probleme with socket weld flanges arose because, at the time the procedures were written, G-29M requirements did not specify socket weld flange requirements. G-29M was revised on March 21, 1979, to include socket weld flange requirements. However, TVA failed to incorporate this change into its site quality control procedures.
Fillet weld gauges not being available to assist the inspectors in determining the adequacy of a weld also contributed to the problem.
Interim Progress NCR's 1188 and 1563 A total of 10,140 socket welds in 43 plant systems under the scope of NCR 1188 were eventually identified by Bellefonte. Of this amount, 9,451 were reinspected, 673 were embedded, and 16 more are inaccessible for inspec tion. NCR 1563 was recently written to disposition these inaccessible welds.
The total rejectable of those inspected was 668 welds equating to a total reject rate of 7.1 percent. Only 66 welds (0.7 percent) were undersized by more than 1/16". A breakdown on those welds found rejectable follows:
Undersized Throat Undersized Leg Undersized Leg & Throat Together 318 271 79 Rework has been completed on almost all of the welds found rejectable. Comple-tion of rework on the remaining accessible welds will be completed by our next report.
The 673 embedded and 16 inaccessible welds will be evaluated and disposi-tioned by TVA's Division of Engineering Design (EN DES) under NCR 1563
-With' regard to recurrence control, Bellefonte sample inspected 540 socket welds that were mads sometime after completion of inspector training and imple '
mentation in the use of fillet weld gauges. No rejectable welds were found.
NCR 1203 Two hundred randomly selected hangers of the over 8,500 identified under the scope of this NCR have been comprehensively reinspected.
.Information regarding this reinspection will be forwarded to EN DES for
. engineering evaluation.
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' NCR's 1188 and 1563 deal with' socket weld fitting and socket weld flange welds, ~ -
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