ML20093J017
| ML20093J017 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 07/11/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 84-25, NCR-2922, NUDOCS 8407250506 | |
| Download: ML20093J017 (2) | |
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TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 400 Chestnut Street Tower II 1984 July 31,I 3 3 t
d BLRD-50-438/84-24 BLRD-50-439/84-23 U.S. Nuclear Regulatory Commission Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - STIFFENERS NOT INSTALLED TO REVISED DRAWINO REQUIREMENTS - BLRD-50-438/84-24, BLRD-50-439/84 FINAL REPORT The subject deficieno;' was initially reported to NRC-0IE Inspector D. M. Verrelli on Marca 8,1984 in accordance with 10 CFR 50.55(e) as NCR 2922. This was followed by our interim report dated April 4,1984.
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 o
L. M. Mills,/ Manager Nuclear Licensing Enclosure 00:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuolear Power Operations 1100 Circle 75 Parkway, suite 1500 Atlanta, Georgia 30339 Nd 8407250506 840711 M yge)AL PDR ADOCK 05000438 B
PDR 1983-TVA 50m ANNIVERSARY ff' y g
An Equal Opportunity Employer
ENCLOSURE
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BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 STIFFENERS NOT INSTALLED TO REVISED DRAWING REQUIREMENTS BLRD-50-438/84-24, BLRD-50-439/84-23 NCR 2922 10 CFR 50.55(e)
FINAL REPORT Description of Deficiency TVA nonconformance report (NCR) 1894 (BLRD-50-438/82-66, BLRD-50-439/82-59) identified a significant condition adverse to quality (CAQ) in which groove welds, as specified on TVA drawing series 4DWO760-X2, were made as fillet welds. Tb subject welds are cable tray support welds in the diesel generator ouilding (DGB). As corrective action given in the final report to the NRC on NCR 1894, TVA committed to revise the drawing series 4DWO760-X2 and to rework the affected supports per those revised drawings.
NCR 1894 was closed and signed off as having had all corrective action completed and inspected on June 16, 1983 It has now been identified that none of the affected MK8C cable tray supports in the DGB have been reworked as was required by the revised 4DWO760-X2 drawing series. The rework involves the addition of stiffeners to the affected supports.
TV3 has determined that the cause of this deficiency was an inadequate review of the revised 4DWO760-X2 drawing series by TVA's Division of Construction (CONST) engineering and craft personnel. This is in part due to the support design changes related to NCR 1894 being issued on an S1 engineering change notice (ECN). The S1 ECN is used to make minor revisions only and does not require coordination with groups outside of the originating organization.
The design changes related to NCR 1894 dealt with weld details and the addition of stiffeners (which was not related to NCR 1894) was not coordinated with CONST. Thus, in reviewing the drawings for weld details, the addition of stiffeners was undetected by CONST personnel. Subsequently, the previously completed quality control documentation was not invalidated and the stiffeners were not added.
Safety Implications 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-related electrical systems. This could adversely affect the safe operation of the plant.
Corrective Action TVA has inspected all cable tray supports in the unit 1 DGB and no further discrepancies were found. Based or. 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 Bellefonte (BLN) Quality Control Procedure (QCP) 10.6, " Work Release."
BLN QCP-10.7, " Quality Assuranca Records," was revised (revision 8) on May 16, 1984. This proccdure now requires a review of all drawing revisions to check for configuration dianges and the need to invalidate previous quality control (QC) inspections. This will require that QC records be invalidated upon the issue and review of revised drawings rather than waiting until preparation of the rework documentation. Additionally, TVA's Division of Engineering Design Engineering Procedure 4.02, " Engineering Change Notices -
Handling," was revised on June 7,1983. This revision d1anges the definition of an S1 ECN and more clearly defines the conditions under which it may or may not be used. These actions should prevent recurrence of this deficiency.
TVA will complete all necessary corrective actions for this item by August 20, 1984.
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