ML20106D253
| ML20106D253 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 10/16/1984 |
| From: | Counsil W, Sears C NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| F0563A, F563A, SD-52, NUDOCS 8410250060 | |
| Download: ML20106D253 (2) | |
Text
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General Offices
- Selden Street. Berlin, Connecticut vm co wevcur us e enaasacow.m P.O. BOX 270
, ',7,$*,,7,,""c, HARTFORD. CONNECTICUT 06141-0270 l
J (203) 66s-s000 mavmasr =ar swas,cc October 16, 1984 Docket No. 50-423 F0563A Dr. Thomas E. Murley Regional Administrator Region I U. S. Nuclear Regulatory Commission 631 Park Avenue i
King of Prussia, PA 19406
References:
(1)
W. G. Counsil letter to T. E. Murley, F0489A, dated March 7, 1984.
(2)
W. G. Counsil letter to T. E. Murley, F0511A, dated May 22, 1984.
Dear Dr. Murley:
Millstone Nuclear Power Station, Unit No. 3 Reporting of Potential Significant Deficiencies in Design and Construction: Service Water Pipe Trunnions (SD-52)
In a February 6,1984 telephone conversation between your Mr. T. Elsasser and our Mr. R. W. Vogel, Northeast Nuclear Energy Company (NNECO) reported a potential significant deficiency in the construction of Millstone Unit No. 3 as required by 10CFR50.55(e).
The potential significant deficiency involved fabrication of integral welded carbon steel trunnions to copper nickel piping in the Service Water System.
Deformation of the copper nickel pipes in the vicinity of the carbon steel trunnions was observed. Two attachment weldments leaked during hydrostatic tests (see References 1 and 2).
Our architect-engineer, Stone & Webster Engineering Corporation, and our engineering staff have completed their evaluation of this significant deficiency.
i Based on this evaluation, the following corrective actions were taken to eliminate this design deficiency:
1.
All previously installed integrally welded carbon steel trunnion attachments to copper nickel piping were replaced.
2.
All integrally welded carbon steel attachments to copper nickel piping were redesigned.
3.
The redesign eliminated trunnion attachments where possible and replaced them with non-integral support designs. In cases where welded trunnion supports were still required, carbon steel trunnions were replaced with copper-nickel trunnions.
8410250060 841016 PDR ADOCK 05000423 I,
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3 so-1 : We consider this to be our final report closing out SD-52. We trust that the
-above information satisfactorily responds to your concerns.
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Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY W. b.O W. G. Counsil Senior Vice President By: C. F. Sears Vice President cc:
Mr. R. C. DeYoung, Director Division of Inspection and Enforcement U. S. Nuclear Regulatory Commission Phillips Building 7920 Norfolk Avenue.
Bethesda, MD 20014-
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