TXX-4965, Final Deficiency Rept CP-86-30 Re Burnt Wire on Capacitor Bank in Elgar Corp Power Sys Inverter & Burnt Tywraps. Initially Reported on 860418.Burnt Wire Attributed to Bad Crimping.Issue Not Reportable Per 10CFR50.55(e)

Final Deficiency Rept CP-86-30 Re Burnt Wire on Capacitor Bank in Elgar Corp Power Sys Inverter & Burnt Tywraps. Initially Reported on 860418.Burnt Wire Attributed to Bad Crimping.Issue Not Reportable Per 10CFR50.55(e)

ML20212L001
Person / Time
Site:	Comanche Peak
Issue date:	08/18/1986
From:	Counsil W, Keeley G TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
CP-86-30, TXX-4965, NUDOCS 8608250159
Download: ML20212L001 (2)

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Log # TXX-4965 File # 10110 908.3 TEXAS UTILITIES GENERATING COMPAlW

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En% M ffr.S Mr. Eric H. Johnson, Director Division of Reactor Safety and Projects U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, TX 76012

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET NOS. 50-445 AND 50-446 UPS INVERTERS SDAR: CP-86-30 (FINAL REPORT)

Dear Mr. Johnson:

l On April 18, 1986, we verbally notified your Mr. R. Hall of a deficiency r involving anomalies observed in Class IE inverters supplied by Elgar

) Corporation of San Diego. We have submitted interim reports logged TXX-4812 I

and TXX-4880, dated May 19, 1986, and June 27, 1986, respectively. On August 15, 1986, we requested and received an extension until August 18, 1986, in submitting this report from your Mr. D. Hunnicutt The anomalies are a burned wire on a capacitor bank in one inverter and burned tywraps. The burned wire was detected during an inspection of the equipment and is attributed to an isolated case of bad crimping by the vendor. The tywraps were used during the manufacturing process and the temperatures they were exposed to during the baking discolors and weakens them. The tywraps are not required for the mechanical integrity of the assembly or the operability of the equipment. The evaluation of this issue shows that if the deficiency had gone undetected, the safety of operations at CPSES would not have been adversely affected. Therefore, we have concluded that this issue is r.ot reportable under the provisions of 10CFR50.55(e). Records supporting this deter:nination are available for your inspectors to review at the CPSES site.

Very truly yours, W

W. G. Counsil V

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By: /

G. S. Keeley . f Manager, Nuclear'Lfcensing JCH/arh

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