ML19257B917
| ML19257B917 | |
| Person / Time | |
|---|---|
| Site: | Hartsville  |
| Issue date: | 01/11/1980 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML19257B913 | List: |
| References | |
| NCR-HNP-A-062, NCR-HNP-A-62, NUDOCS 8001210226 | |
| Download: ML19257B917 (1) | |
Text
ENCLOSURE HARTSVILLE NUCLEAR PLANT UNITS Al AND Bl CONTAINMENT ANCHCR BOLT CHAIR WELD DEFICIENCIES 10CFR50.55(e) REPORT NO. 2 (INTERIM)
NCR HNP-A-062 On August 2,1979, TVA notified NRC-0IE Region II, Inspector F. S. Cantrell, of a potentially reportable condition under 10CFR50.55(e) regarding deficient welds between the containment anchor bolt chair (stif fener plate) and both the containment shell and the containment base plate. This is the second interim report on the subject reportable condition. An interim rather than final report is being filed because TVA is preparing a request to the Engineer, GE/C. F. Braun, for reduction it the overall containment anchor bolt chair veld requirements which would account for the additional anchorage provided by concrete added in the annulus during recent design changes. The final report will be submitted on or before March 19, 1980.
Interim Progress Twenty-five ine;ectors were found to have passed unacceptable containment anchor bolt chu.r (CABC) welds on units Al and Bl.
The magnetic particle examination (MT) and/or visual examination certifications for all 25 of the inspectors were subsequently administrcti aly revoked. Since then all but two of the inspectors have been retrained and recertified as appropriate and one of the inspectors was terminated for other reasons.
The remaininn two inspectors have not been retrained or recertified to, the MT method. They are currently assigned to inspection duties not requiring MT certification and will be retrained and/or recertified before any reassignsent requiring MT certification.
All welders and welding foremen are scheduled to attend a welder training program beginning February 1980. The program will include indoctrination in AWS/ASME welding requirements.
As a result of this deficiency, TVA has undertaken an extensive investigation of welds that had been previously accepted. This investigation and evaluation was supervised by an independent inspector certified as NDE Level III Constraction. This evaluation was performed of other completed weldments'in units Al and Bl to determine if the deficiencies present in the CABC welds existed in other areas of the site. This evaluation included a complete reinspection to specification requirements of 150 randomly selected welds and a visual survey of welds in the general area of the 150 selected welds. The overall reinspection indicates that the deficiencies present on the anchor bolt chair welds were not predominately present in other areas at the Hartsville Nuclear Plant.
The overall evaluation of the independent Level III inspector was that the anchor chair deficiencies were an isolated condition and that the overall weld inspection program is adequate and comparable to the industry standard.
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