ML20113D031
| ML20113D031 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 03/06/1985 |
| From: | Hufham J TENNESSEE VALLEY AUTHORITY |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NCR-2922, NUDOCS 8504120223 | |
| Download: ML20113D031 (2) | |
Text
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TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 374o1 400 Chestnut Street Tower II 85 MAR 12 P$cd h,1985' BLRD-50-43 844-24 BLRD-50-43944-23 U.S. Nuclear Regulatory Commission Region II Attn:
Dr. J. Nelson Grace, Regional Acklinistrator 101 Marietta Street, NW, Suite 2900
- Atlanta, Georgia 30323
Dear Dr. Grace:
BELLFJ(NTE NUCLEAR PLANI W!ITS 1 AND 2 - STIFFENERS NOT INSTALLED TO REVISED DRAWING REQUIRE!ENTS - BLRD-50-43844-24 AND BLRD-50-43944 REVISED FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector D. M. Verrelli on March 8,1984 in accordance with 10 TR 50.55(e) as NCR 2922. This was followed by our interici report dated April 4,1984 and our final report dated July 11, 1984.
Enclosed is our revised final report.
If you have any questions, please get in totch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE, VALLEY AUTHORITY f
1 I
.W.
uf anager L
nsin at Regulations Enclosure cc:
Mr. James Taylor, Director (Enclos e)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commi,ssion Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 h
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EN1CSURE t
l BELLEFCNTE NUCLEAR PLANT UNITS 1 AND 2 STIFFENEPS NOT INSTALLED TO REVISED DRAWING REQUIREtENTS BLRD-50-438/84-24, BLRD-50-439/84-23 10 TR 50.55(e)
NCR 2922 REVISED FINAL REPORT Description of Deficiency i
TVA nonconformance report (NCR) 1894 identified a significant condition
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adverse to quality (CAQ) in which groove welds, as specified on TVA drawing series 4DWO760-X2, were made as fillet welds. The subject welds are cable tray support welds in the diesel generator buidings (DGBs). As corrective action given in the final report to the NRC on NCR 1894, TV A committed to revise the drawing series 4DWO760-X2 and to mwork the affected supports per
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those revised drawings. NCR 1894 was closed and signed off as having had all
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corrective action completed and inspected on June 16, 1983 L
It has now been identified that none of the affected MK8C and MK8D cable tray supports (14 total) in the DGB have been reworked as was required by the revised 4DWO760-X2 drawings series. The rework involves the cddition of stiffeners to the affected supports.
TVA has determiEal that the cause of this deficiency was an inadequate review o of the revised' 4DWO760-X2 drawing series by TVA's Division of Construction
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(CONST) engineering and craf t personnel. This is in part due to the fact that the addition of stiffeners to those 14 supports was not specifically addressed in the disposition of.NCR 1894 nor on the revised title block of the revised 4DWO760-X2 drawing series. Thus, in reviewing the drawings for weld details, the addition of st{iffeners was undetected by CONST personnel.
Subsequently, the previously contpleted quality control documentation was not invalidated and the stiffeners were not added.
Safety Inplications The failure to install cable tray supports per design requirements could result in an inadequate installation. This could result in a failure of the supports during a design basis event and the subsequent failure of the affected safety-mlated electrical systems. This could adversely affect the safety of operations of the plant.
Corrective Action TVA has inspected all cable tray supports in the unit 1 DGB and no further discrepancies were found. Based on the inspection of the unit 1 DGB cable tray supports, TVA has determined that this deficiency is limited to the addition of stiffeners on 14 MK8C and MK8D supports (7 for each unit). These stiffeners are currently being installed per BLN Quality Control Procedure (QCP) 10.6, " Work Release."
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