ML20210A512
| ML20210A512 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 12/12/1986 |
| From: | Rice P GEORGIA POWER CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| GN-1222, NUDOCS 8702060486 | |
| Download: ML20210A512 (2) | |
Text
Georg a Poer Company Post O'tce Box 282 Wanesboro. Georg a 30830 Tucchone 404 554 9961. Ext 3360 404 724-8114. Ext. 3360 A
e o.me.
N g A10 : 00 Georgia Power Vcc Pres dent Vogre Propct December 12, 1986 United States Nuclear Regulatory Commission Region II File : X7BG03-M65 Suite 2900 Log:
GN-1222 101 Marietta Street, Northwest Atlanta, Georgia 30323
Reference:
Vogtle Electric Generating Plant - Units I and 2; 50-424, 50-425; Pullman Construction Industries - Duct Support Shop Welds; Letter GN-421 dated September 19, 1984 Attention: Mr. J. Nelson Grace In our previous correspondence on the above referenced subject, Georgia Power Company identified a reportable condition involving partial penetration welds in some HVAC duct supports where full penetration welc's were required by design.
In the evaluation attached to correspondence GN-421, Georgia Power Company described the corrective actions planned to resolve the condi-tion.
In actual implementation, it was determined that these actions may not fully resolve the identified concern.
Therefore, the following alte.nate corrective actions were implemented to ensure the adequacy of the affected HVAC duct supports:
1.
HVAC Specification X4AJ01 was revised to require a mandatory witness point for fit-up of full-penetration welds in HVAC support mitered tube steel joints.
Verification of proper fit-up was accomplished by a Supplier Quality Representative representing the Vogtle Project for welds performed in the vendor shop and by Georgia Power Company Quality Control Inspectors for welds performed on site.
2.
The vendor instituted a mandatory hold point in its fabrica-tion process for full penetration welds in mitered tube steel joints. A similar hold point was required by the site HVAC contractor's procedure.
3.
Weld detail drawings for HVAC supports have been revised to require a backing bar for mitered joint full penetration welds.
4.
Design drawings AX2D67W029 and AX2D67WO31 have been revised to provide an alternate "T"
type corner joint detail for HVAC supports which uses fillet and flare bevel welds rather than full penetration welds.
This alternate configuration was easier to construct and inspect and provided adequate supporting strength, f**
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Page 2 USNRC GN-1222 5.
The thirty (30) supports identified in the attachment to our correspondence GN-421 that used the mitered joint configura-tion were scrapped.
Of the replacement supports, twenty-six (26) were fabricated using the new "T"
type alternate design.
The remaining four (4) supports utilized the mitered joint configuration and have been verified to con-tain full penetration welds.
The corrective actions outlined above are complete and are still in place in case any future modifications are required to HVAC sup-ports.
This response contains no proprietary information and may be placed in the USNRC Public Document Room.
Yours truly, fh P. D. Rice REF/PDR/jl xc:
U. S. Nuclear Regulatory Commission Document Control Desk Washington, D. C. 20555 H. G. Baker J. A. Bailey G. A. McCarley J. P. O'Reilly G. Bockhold R. W. McManus R. E. Conway J. F. D'Amico W. W. Mintz R. H. Pinson W. D. Drinkard C. W. Whitney B. M. Guthrie L. T. Gucwa Sr. Resident (NRC)
R. A. Thomas C. W. Hayes C. C. Garrett (0PC)
D. R. Altman J. E. Joiner (TSLA)
D. Feig (GANE)
NORMS i