ML20083G657

Final Deficiency Rept U-51 Re Cable Routing Through Field Designed Electrical Junction Boxes in Violation of Min Bend Radius Requirements.Initially Reported on 830314.Cables Tested & Replaced in 19 of 23 Junction Boxes

ML20083G657
Person / Time
Site:	Callaway
Issue date:	12/28/1983
From:	Schnell D UNION ELECTRIC CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 10CFR-50.55E, U-51, ULNRC-709, NUDOCS 8401060363
Download: ML20083G657 (2)

Text

, [C] - W S UNION ELECTRIC COM PANY /) <n 1901 GRATIOT STREET ST. Louis, MISSOURI December 28, 1983 =^yga 4qop;..=

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Mr. James G. Keppler, Regional Administrator U.S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 ULNRC- 709

Dear Mr. Keppler:

FINAL 10CFR50.55(e) REPORT NO. U-51 CABLE MINIMUM BEND RADIUS VIOLATIONS CALLAWAY PLANT On March 14, 1983, Union Electric informed the NRC Region III office of a potential 10CFR50.55 (e) deficiency concerning cable routing through field-designed electrical junction boxes.

The junction boxes were sized in a manner such that cables pulled through them could have violated minimum bend radius requirements.

We have conducted a review of all field-designed junction boxes and have identified twenty-three undersize boxes containing cables which violate minimum bend radius criteria.

Other boxes were found undersized, but these did not yet contain cables or were not yet installed. We have reworked or redesigned these boxes to eliminate the minimum bend radius problems.

Bechtel has analyzed the cables which violated the bend radius criteria and determined that some should be replaced while others with minor violations of radius criteria were found accep-table by testing. Such cables were subjected to a 1,000-volt megger test, which ensures the bending radius violation has not degraded the insulation or dielectric properties of the cable.

To date, Union Electric has tested or replaced cables in nineteen of the twenty-three junction boxes. Of the cables tested, all have passed the acceptance criteria.

The remaining four junction boxes contain cables which are essential to support plant hot functional testing and cannot be readily deenergized for replacement or megger testing. Union Electric will test and/or replace the remaining cables prior to fuel load.

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' Mr. James G. Keppler December 28, 1983 Page 2 Union Electric acknowledges that the cables replaced might have failed and possibly affected plant safety. Therefore, we consider this item significant and reportable under the guidelines of 10CFR50.55 (e) . This letter serves as our final report on this subject..

Very truly yours, p_

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[ 6( Donald Schnell t

MAC:glp cc: J. E. Konklin, Region III Richard DeYoung, Director I&E Bruce Little, NRC Resident Inspector l

John Neisler, NRC Resident Inspector Missouri Public Service Commission