ML20028F354
| ML20028F354 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 01/21/1983 |
| 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 8302010265 | |
| Download: ML20028F354 (2) | |
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, t y' TENNESSEE VALLEY AUTHORITY CH ATTANOOO A, TENNESSEE 37401 400 Chestnut Street Tower II January 21, 1983 u
BLRD-50-438/82-66 Q
j BLRD-50-439/82-59 m
3 r
U.S. Nuclear Regulatory Commission
,7 Region II Attn: Mr. James P. O'Reilly, Regional Administrator cr 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - DEFICIENT WELDS ON CABLE TRAY SUPPORTS - BLRD-50-438/82-66, BLRD-50-439/82 FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector R. V. Crlenjak on September 8, 1982 in accordance with 10 CFR 50.55(e) as NCR 1894. This was followed by our interim report dated October 8, 1982.
Enclosed is our final report.
If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY-L. 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 8302010265 830121 gDRADOCK05000 OFFICIACCOPY I8A An Equal Opportunity Employer
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w ENCLOSURE BELLEFONTE NUCLEAE PLANT UNITS 1 AND 2 DEFICIENT WELDS ON CABLE TRAY 57PPORTS 10 CFR 50.55(E)
NCR 1894 BLRD-50-438/82-66, BLRD-50-439/82-59 FINAL REPORT Description of Deficiency Groove welds specified on TVA drawings (4DWO760-X2 series) were made as fillet welds. The subjecc welds are cable tray support welds on trays in the Diesel Generator Buildings. The failure of craft personnel to pay close attention to the drawing details is the apparent cause.
Safety Implications The trays involved carry safety-related cables. Should the welds fail, there is a possibility that the safety-related cables could be damaged, thus resulting in a condition that could adversely affect the safety of operations of the plant.
Corrective Action The cable tray supports are being reworked as necessary. Bellefonte Construction has identified to Engineering Design (EN DES) the sizes o'f the
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fillet welds used on the supports. EN DES has evaluated the weld sizes for adequacy and has determined which welds require rework. Revised drawnigs 4DWO760-X2-4 R7, 4DWO760-X?-6 R11, 4DWO760-X2-7 RS, and 4DWG760-X2-8 R6 have been revised by TVA, and these drawings now include a new or alternate weld symbol to indicate the supports needing rework. The rowork will utilize fillet welds and the fillet weld size shown on the drawings is the minimum acceptable size. Where existing fillet welds exceed the specified dimension, they may be used as is. Support modifications are scheduled for completion b.y July 7, 1983 TVA Process Specification O.C.1.1 has been revised to include a surveillance program which is to check welding activities in process and includes a pre-weld inspection made by the welder and his foremar. of the weld-joint dimensions.
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