ML20023C325
| ML20023C325 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 05/06/1983 |
| From: | Wells D DETROIT EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, EF2-63504, NUDOCS 8305170207 | |
| Download: ML20023C325 (2) | |
Text
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50-SWI Donald A. Wells yrm,0wy Ann e GW 2 3i %s?
Edison !EisGN" buy 6, 1983 EF2-63504 Mr. James G. Keppler, Regional Aininistrator Region III
. U.S. Nuclear Regulatory Comnission 799 Roosevelt Road Glen Ellyn, Illinois 60137
Subject:
Final Report of 10CFR50.55(e) Itm on Arc Strikes on Primary Containment Pipe Penetration Bellows (#81)
Dear Mr. Keppler:
This is Detroit Edison's final report involving arc strikes on primary containment pipe penetration bellows at the Fermi 2 site. This item was originally reported to Mr. H. Wescott of NRC Region III by Detroit Edison's Mr. D. Ferencz, Acting Supervisor - Construction Quality Assurance, on Nov-ember 23, 1982.
The arc strikes are between 1/8" and 3/16" in diameter on the outer ply.
The bellows consists of two (2) plys, each with a wall thickness of.037",
and are separated by a stainless steel mesh approximately 1/16" thick. A visual examination established that the outer ply is perforated in one instance without damage to the steel mesh. The inner ply is not damaged, but will be checked with a boroscope to verify no discoloration of the internal surface.
The arc strikes on Penetration X10 bellows assmbly were repaired in accordance with a repair program prepared by Multiple Dynamics Corporation.
This program follows the guidelines established in Code Case N-315.
Before the actual repair, three (3) full scale facsimile bellows were used for welder training, and weld procedure qualification. One (1) facsimile was used for subsequent fatigue testing. Analysis of the X10 bellows repair prepared by Multiple Dynamics Corporation summarizes:
"The fatigue test met all the requirements of ASME Code and Code Case N-315, and the remain-ing factor of safety to failure is so substantial that prudent judgment could not justify any further evaluation or testing". Therefore, this item is determined to be non-reportable per 10CFR50.55(e) requirements.
If you have questions concerning this matter, please contact Mr. G.M.
Trahey, Assistant Director - Project Quality Assurance.
Very truly yours, f
DAW /WEM/pn M
9305170207 830506 MM 9
PDR ADDCK 05000341 S
b Mr. James G. Keppler, Regional Mninistrator May 6, 1983 Page Two EF2-63504 cc: Mr. Richard DeYoung, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Ccmnission Washington, D.C.
20555 Mr. B.H. Little, Senior Resident Inspector U.S. Nuclear Regulatory Camission 6450 North Dixic Highway Newport, Michigan 48166 l
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