ML19339C050
| ML19339C050 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 11/03/1980 |
| From: | Fiorelli G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Gerstner W ILLINOIS POWER CO. |
| References | |
| NUDOCS 8011170254 | |
| Download: ML19339C050 (1) | |
Text
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f UNITED STATES 8
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Mr. W. C. Gerstner O!
tra Executive Vice President 500 South 27th Street
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Decatur, IL 62525
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Gentlemen:
Thank you for your interim report dated October 22, 1980, pursuant to 10 CFR 50.55(e) regarding suspect cracking in certain hardware for electrical hangers supplied by Midland /Ross Super Strut.
We will review this matter upon receipt.
Your cooperation with us is appreciated.
Sincerely,
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G. Fiorelli, Chief React'or Construction and Engineering Support Branch cc: Director, RCI/IE Director, AE0D Chief, OEB/MPA IE Files cc w/ltr dtd 10/22/80:
Central Files Reproduction Unit NRC 20b PDR Local PDR NSIC TIC Mr. Dean Hansell, Office of l
Assistant Attorney General
.Mr. Gary N. Wright, Chief I
Division of Nuclear Safety
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'n is.LINDIS POWER 00MPANY f d',,_! 500 SOUTH 27TH STREET, DECATUR, ILLINOIS 62525 October 22, 1980 Mr. James G. Keppler Director', Region III Office on Inspection and Enforcement U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137
Dear Mr. Keppler:
CLINTON POWER STATION UNIT I DOCKET NO. 50-461 CONSTRUCTION PERMIT NO. CPPR-137 i On June - 25,-1980, Illinois Power Company verbally notified Mr. H. M. Wescott, -USNRC Region III, of-a potectial reportable deficiency per 10CFR50.55(e) concerning suspect cracking in certain 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 complete our investigation. While it has been determined that certain hardware fittings are possibly inadequate, the boundaries of'the potential deficiency are not sufficiently established. Accordingly, this submittal is an interim report, and it is anticipated that an additional 45 days will be necessary to fully determine reportability and corrective action. Investigation of Deficient Hardware on Electrical Hangers l 1. Statement of Reportable Deficiency The investigation to~date has developed insufficient data to define.the limits of the deficiency associated with hardware fittings. 2. Investigation Results (to date) To-date, investigation of the potentially defective hard-ware has consisted of two sets of preliminary tensil tests and on-site visual inspection of all stock hardware. $oHoloS% och 2 7 seo
Investigation Results (cont'd) r The preliminary tests were (1) to verify loading values of the individual. fittings and (2) to verify load transfer cLarac-4 teristics of the fittings in simulated hanger configurations. These tests have identified weld repaired fittings as being inadequate for service. Load bearing and' transfer characteristics-of the fittings-were 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 approximately 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 Super Strut production facility. The ~ Architect-Engineer (S&L), Constructor (Baldwin Associates) and l Licensee (Illinois Power) are monitoring this testing program. The objective of these rather comprehensive tests is to definitively determine the load bearing and transfer capabilities of the potentially defective fittings; and, if determined to be inadequate, to establish an inspection criteria for hardware currently installed i with electrical hangers at Clinton. l 3. Corrective Action The Midland /Ross Super Strut Company has revised their shop i' 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 weld repair 1 I prior to new installation has been implemented. When definitive acceptance criteria'is determined from current testing, further 3 } replacement of installed hardware may be required. Pending completion of current testing and evaluation of results, Midland / Ross is considering generic deficiency reporting. 4 4. Safety Implication / Significance t An assessment of significance is deferred until the final i report is made. We trust this. report supplies sufficient information to permit initial review. We expect to submit the final report on this issue in December, 198g4.4fu,m e & / A f Sincerely, ^^ G c ykw i W. C. Gerstner, = I Executive Vice President AJB/ph cc: H. H. Livermore, USNRC Resident Inspector Director, Office ^of I&E, USNRC, Washington, D.C. a +,, p-3 -r , -}}