ML20095L458
| ML20095L458 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 08/15/1984 |
| From: | Jens W DETROIT EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 68, EF2-69696, NUDOCS 8408300251 | |
| Download: ML20095L458 (3) | |
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6400 Nein Due Hfway N.wanet, Megan 48160 omam August 15, 1984 EF2-69696 Mr. James G. Keppler Regional Administrator Region III U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 f
Dear Mr. Keppler:
References (1) Fermi 2 NRC Docket No. 50-341 (2) Letter, D. A. Wells to J. G. Keppler, June 11, 1982, EF2-580 74 (3) Letter, D. A. Wells to J. G. Keppler,.
October 8, 1982, EP2-59399
Subject:
Final Report of 10CPR50.55(o) Item 60
" Defective Pipe Support Strut Swivel nearings" This is Detroit Edison's final report of item 68, "Defectivo Pipo Support Strut Swivel Hearings."
This item was originally reported as a potential 10CPR50.55(o) deficiency on May 14, 1982 and subsequently documented in References (2) and (3).
Doncription of Deficiency This problem involves loono or, in some canon, dislodged sway strut swivel bearingn.
Thu problems identified at Fermi 2 are similar to the problems described.in IE Circular 81-05.
During construction activities in the Residual llcat hemoval (RllR) Complex, a contractor's quality control department identitled various problems with sway strut installations.
These problems were documented in lionconformanco Reports (NCRs) 6370 and 4370A.
The ilCRs identified 21 pipo supports with discrepancies such as, loose or dislodged scarings, excessive gaps and missing or inadeyunto wanhorn.
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Mr.. James G. Keppler-August-15, 1984 -
EF2-69696
~Page'2 Analysis of Safety-Implications
-Failureiof:the sway struts to function as designed could induce stresses _not-considered"in the piping analysis of a safety related system.
Corrective Action Edison placed-an engineering hold on any rework, pending resolution of the problem'and development of a coordinated corrective action plan-withLthe appropriate vendors.
The'following actions were taken to correct'the deficiencies
~
and prevent recurrence.
o Edison, in conjuction with the dppropriate vendors, developed and implemented procedures to' rework the affected swivel bearings.
o Training sessions were conducted with. craf t, engineering and quality control personnel on the corrective. measures-delineated in the procedures.
o.
The corrective action in'cluded staking and/or re-securing the af fected swivel bearings.
In addition to the corrective actions to resolve:the nonconforming items j.- Detroit Edison initiated theNfollowing actions to insure the proper operati6n of all sway strut; swivel bearings.
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Edison. conducted a survey of approkimately 50. randomly selec.ted sway strut installations-for swivel bearing
. problems.
Based on a 10 % rejection' rate.and the identification.of othdr strut relat' d deficiencies, e
Edison elected to complete a 100 % engineering evaluation-of all sway strut installations.
o All rework actions identified by the evaluation program have been documented on Deviation Disposition ~ Requests (DDRs) or Work Assignment Sheets / Material Notices (WASMNs )..
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Mr. James G Keppler-August. 15, 1984 EF2-69696 Page 3
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-In: addition'to_ sway strut evaluations, Edison included
. all hydraulic and' mechanical-snubbers in another evaluation program.
No dislodged bearings'were found.
The required rework in the.Drywell is1 complete.
The balance of the safety related rework-is in the final stages of
- completion.
This is Detroit Edison's final report on this item.
If you
-have questions concerning this matter, please contact Mr. Lewis P. Bregni, (313) 586-5083.
Sincerely,
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Mr.
P. M. Byron Mr.
R. C. DeYoung Mr.
R. C. K nop t
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