ML20128Q015
| ML20128Q015 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 05/10/1985 |
| From: | Opeka J NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| F0755A, F755A, SD-80, NUDOCS 8506040047 | |
| Download: ML20128Q015 (2) | |
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L (203) 66s-s000 May 10,1985 Docket No. 50-423 F0755A Dr. Thomas E. Murley Regional Administrator U.S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406
Dear Dr. Murley:
Millstone Nuclear Power Station, Unit No. 3 Reporting of Potential Significant Deficiencies in Accordance with 10CFR50.55(e):
Skewed Angle Fillet Welds (SD-80)
In an April 12,1985 telephone conversation between your Mr. T. Rebelowski and our Mr. P. 3. Quinlan, Northeast Nuclear Energy Company (NNECO) reported a potential significant deficiency in the construction of Millstone Unit No. 3 in accordance with 10CFR50.55(e). -The potential significant deficiency involves the weld preparation on skewed fillet weld joints.
During the NRC Construction Appraisal Team (CAT) inspection at Millstone Unit No. 3, a concern was raised with respect to the dimensioning of fillet welds on tube steel connections where the skewed angle is less than 450 Upon review of the weld documentation and a sampling of as-built welds, we were not able to determine whether the toe of the tube steel had been cut back as required by the weld joint design detailin order to accommodate the specified weld size on both weld legs. Failure to cut back the toe as designed could result in undersized welds.
To address this potential significant deficiency, we have separated this problem into two categories:
(1) 3 or 4 sided welds - skewed angle joints welded on the toe and two sides or welded all the way around.
(2) 2 sided welds - skewed angle joints with only toe and heel welded.
Our architect-engineer, Stone & Webster Engineering Corporation, has completed their review of the 3 or 4 sided welds and determined that this is not a significant deficiency and that the welds are acceptable as is. The 2 sided welds are still under investigation.
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-:a - We are not able to provide a final report at this time. We will provide an update on this matter by July 10,1985.
Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY h k b. U
- 3. F. OW U
Senior Vice President cc:
Mr. 3. M. Taylor, Director Division of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D. C. 20555