ML19338E571

Final Deficiency Rept Re Cutler-Hammer Motor Control Ctrs. Manufacturer Will Rewire Motor Control Ctrs,Replace Improper Saddle Clamps & Test & Replace Splice Plate Carriage Bolts. Estimated Date of Completion Is 810227

ML19338E571
Person / Time
Site:	Perry
Issue date:	09/29/1980
From:	Davidson D CLEVELAND ELECTRIC ILLUMINATING CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8010030370
Download: ML19338E571 (3)

Text

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P o. Box 5000 m CLEVELAND. ohio 44101 e TELEPMoNE (216) 622-9800 e ILLUMINATING BLOG. e 55 PUBUCSoUARE Dalwyn R. Davidson viCE PRESIDENT SYSTEu ENGINEERING AND CONSTRUCTION Septe=ber 29, 1980 Mr. James G. Keppler Director, Region III office of Inspection and Inforce=ent U.S. Nuclear Regulatory Co==ission 799 Roosevelt Road Glen Ellyn, Illinois 60137 Re: Perry nuclear Power Plant Final Report on Motor Control Centers

Dear Mr. Keppler:

This letter constitutes the final report required by loCFTt50.55(e) on the deficiencies concerning Cutler-Ha==er motor control centers. These ite=s were first reported to the NRC by Cutler-He==er as a loCFR21 on May 11, 4 1980. It was later reported as a significant deficiency under loc 7R50.55(e) in a telephone conversation between W. J. Kacer and T. A. Boss of The Cleve- i land Electric Illuminating Company and Mr. J. Konklin of the NRC, Region III, I office of Inspection and Enforce =ent on May 28, 1980 An interi= report was l later submitted to you en June 25, 1980. l l

Description of Deficiency Cutler-Ha==er was contracted by The Cleveland Electric Illu=inating Company i (CEI) to manufacture Class IE notor control centers for Perry Nuclear Power Plant. During a final inspection by Cutler-Ha==er of a portion of these units, it was discovered that the wire installed in so=e of the starter units was not qualified to IEEE 383 and that improper saddle clamps were used on the terminal blocks. Further inspection of e l 1,943 starters revealed that 42 contained i= proper wire and 25 contained ter=inal blocks with i= proper saddle clamps. It was later discovered at the job site that four splice plate carriage bolts broke during installation on the bus.

Discussion of this proble= with Cutler-Ha==er representatives revealed that during a configuration study it was discovered that the wire being used did not meet specification requirements. In addition, it was discovered that inadequate production floor controls enabled i= proper ter=inal blocks to be installed in the units. Exa=ination of the carriage bolts by CEI's labora-tory showed that the bolts failed due to a =anufacturing defect which probably affected an entire production batch.

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Mr. James G. Keppler September 29, 1980 Analysis of Safety Implicatict:

Due to the number of motor control centers received with i= proper wiring, i= pro- ,

per terminal blocks and defective carria6e bolts, there is some concern that the units win be able to perform adequately during or after a seismic event or loss of coolant accident. Since the motor control centers are necessary for the safe operation and shut down of the nuclear power plant, extensive repair v41' be nec-essary to bring the centers into compliance with the specification.

Corrective Action In order to correct the deficiencies in the cotor control centers, the following steps will be taken:

1. Those starters with i= proper wire will be returned to Cutler-Hammer to be rewired with prequalified type SIS control wire.

This win bring the starters' wiring into ec=pliance with the specification.

2. All terminal blocks with i= proper saddle cla=ps win be re-placed either at Cutler-Ha=mer or at the site, depending on whether or not the particular starter has been returned to Cutler-Ha==er for rewirir4 3 An splice plate carriage bolts will be replaced. In order to ensu;e the bolts win be adequate, Cutler-H-r win test an eight percent sampling of all replacement bolts in accor-dance with MIL-STD-105-D. If any bolts fail the test, Cutler- i Ha==er will reject the batch. To verify replacement at the i site, all replacement bolts will be die sta= ped upon receipt s.nd bolt replacement will be documented by the installing con-  ;

I tractor.

i Su==ary While the a=ount of deficiencies in the motor control centers is nu=erous, their I repair win not be technically co= plex. Howeva'/, due to procedure changes being made at Cutler-H-ar, repair procedures will nave to be approved before the act-ual repairs can be i=plemented. It is anticipated that the procedure approval 1

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Mr. James G. Keppler Septe=ber 29, 19S0

. and repairs win be completed by February 27, 1981. It is felt that the planned

., repairs on the =oter control centers, cace completed, will eli=inate any signi-ficant deficiencies which now exist.

Very truly yours, -

8  ? V8v1/ efrZ Dalwyn . Davidson Vice . esident System Engineering and Construction DRD: bas cc: Mr. Jack Hu6hes l

Resident Inspector U.S. Nuclear Regulatory Co-4 ssion Ferry Nuclear Power Plant Mr. Victor Stello, Director Office of Inspection and Enforcement U.S. Imelear Regulatory Co-4 ssion Washin6 ton, D.C. 20555 U.S. Nuclear Regulatory Co-4 ssion c/o Document Management 3 ranch

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