ML20077B777
| ML20077B777 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood, 05000000 |
| Issue date: | 07/18/1983 |
| From: | Tramm T COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 6972N, NUDOCS 8307250432 | |
| Download: ML20077B777 (2) | |
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[- j-ons First Nationti Pina. Chicago Ill nois g Commonwealth Edison kG ] Address Reply to: Post Office Box 757 y/ Chicago, Illinois 60690 July 18, 1983 Mr. James G. Keppler, Regional Administrator
- Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137
Subject:
Byron Generating Station Units 1 and 2 Braidwood Generating Station Units 1 and 2 Spring Hanger Welding Deficiency s
NRC Docket Nos. 50-454, 50-455, 50-456, and 50-457
Dear Mr. Keppler:
This letter fulfills the thirty-day reporting requirements of 10 CFR 50.55(e) for a Byron /Braidwood pipe hanger deficiency which was purposes, this deficiency ho Mr. Julian Hinds.
reported on June 17, 1983 t For your tracking as been assigned number 83-08 for Byron and 83-06 for Braidwood.
ThisLis an interim report.
The final report will be provided within 90 days.
DESCRIPTION OF DEFICENCY Certain spring hangers were supplied by Elcen Metal Products with welded high carbon steel nuts having carbon content in excess of the applicable ASME Section III limit.
These hangers have a high carbon steel nut welded to a low carbon steel turnbuckle.
There are a number of potentially deficient hangers at each site.
ANALYSIS OF SAFETY IMPLICATIONS Excessive' carbon content could result in embrittlement and premature failure of the nut weld.
Failure of this weld would unload the hanger and would result in increased -primary stresses on safety-related piping.
The specific safety implications of such increased stress levels could only be determined with case-by-case piping analysis.
CORRECTIVE ACTION It has been determined that fourteen hangers at each site have this deficiency.
At Braidwood these fourteen spring hangers have been placed in a " hold area" and are not installed.
At Byron these hangers will be removed and replaced by December 1, 1983.
Approximately 40 hangers at each site are.still being evaluated.
The result of this evaluation will be documented in a later report.
8307250432 830718 1
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