ML19339A306
| ML19339A306 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 10/22/1980 |
| From: | Gerstner W ILLINOIS POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, L14-80(10-22)-L, U-0193, NUDOCS 8011030558 | |
| Download: ML19339A306 (2) | |
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U-0193 L14-80(10-22)-L
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ILLINDIS POWER COMPANY 500 SOUTH 27Tn oiREET, DECATUR, ILufiOIS 62525 October 22, 1980 i
1 Mr. James G. Keppler r
Director, Region III Office on Inspection and Enforcement U: S. Nuclear Regulatory Commission 799 Roosevelt Road Glen E'. lyn, IL 60137 i
Dear Mr. Keppler:
1 CLINTON POWER STATION UNIT I DOCKET NO. 50-461 CONSTRUCTION PERMIT NO. CPPR-137 On June 25, 1930, Illinois Power Company verhally notified Mr. H. M. Wescott, USNRC Region III, of a potential reportable deficiency per 10CFR30.55(e) concerning suspect cracking in certsin hardware for electrical hangers supplied by Midland /Ross Super Strut.
An interim report was submitted July 28, 1980, in which we identified the need for approximately ninety days to t
complete our investigation.
While it has been determined that t
certain hardware fittings are possibly inadequate, the boundaries i
of the potential deficiency are not,sufficiently established.
j Accordingly, this su;bmittal is an interim report, and it is
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anticipated that an additional 45 days sill be necessary to fully determine.eportability and corrective action.
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j Investigation of Deficient Hardware on Electrical Hangers i
1.
Statement of Reportable Deficiency n
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The investigation to date has developed insufficient data to define the limits of the deficiency associated with hardware i '
l fittings.
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2.
Investigation Results (to date) 1 To date, investigation of the potentially defective hard-ware has consisted of two sets of preliminary tensil tests and I
on-site visual inspection of all stock hardware.
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i 8011080 agg 3
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Investication Results (cont'd)
The preliminary tests were (1) to verify loading values of the individual fit-
- s and (2) to verify load transfer charac-teristics of the f.cings in simulated hanger configurations.
These tests have idenr4fied weld repaired fittings as being inadequate for service.
Load bearing and transfer characteristics of the fittings,ere not conclusively ascertained as a result of this testing A visual inspection of all fittings in warehouse stock at the Clinton site revealed that an average of approxicately twenty-five percent of the " winged" type fittings had cracking in excess of 1/16" in the bend radius.
These fittings and similar ones provided by the supplier are currently undergoing additional testing in the Midland /Ross Suoer Scrut production facility.
The Architect-Eng '.neer (S&L), Constructor (Baldwin Associates) and Licensee (Illinois Power) are monitoring this testing program.
The objectiva of these rather comprehensive tests is to definitively determine che load bearing and transfer capabilities of the potentially defective fittings ; ar.d, if determined to be inadequate, to establish an inspection criteria for hardware currently installed with electrical hangers at Clinton.
3.
Corrective Action The Midland /Ross Super Strut Company has revised their shop production methods to increase the bend radius in fittings.
No significant fractures appear in these new production fittings.
A program to replace any fittings showing cracks or wald repair prior to new installation has beca implemented.
When definitive acceptance critet a is determined tram current testing, further replacement of installed hardware may be required.
Pending completion of current testing and evaluation of results, IEdland/
Ross is considering generic deficiency reporting.
4.
Safety Imolication/ Significance An assessment of significance is deferred until the f nal report is made.
We trust this report supplies sufficient informatien to permit initial review.
We expect to submit the final report on this issue in December, 1981.
Sincere'ly,
A, W. C. Gerstner, Executive Vice President AJ3/ph 5
H. H. Livermore, USNRC Resident Inspector Director, Office of I&E, USNRC, Washington, D.C#Cb""
cc:
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