ML17325A269

Part 21 Rept Re Metallic Beads Discovered in Reliance Electric Co motor-operated Valves Installed on Limitorque SMB-000 Valve Operators.Initially Reported on 870821.Caused by Abrasive Cleaning Process.Limitorque Refurbished Motors

ML17325A269
Person / Time
Site:	Cook
Issue date:	08/26/1987
From:	Alexich M INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	Murley T NRC, NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
REF-PT21-87, REF-PT21-87-155-000 AEP:NRC:0971C, AEP:NRC:971C, PT21-87-155, PT21-87-155-000, NUDOCS 8709040409
Download: ML17325A269 (6)

Text

REQULATQP 'NFORMATION DISTRIBUTION TEM (RIDB)

ACCESSION NBR 8709040409 DOC. DATE'7/08/26 NOTARIZED: NO DOCKET 5 FAC IL: 50-315 Donald C. Cook Nuclear Power Plant( Unit 1> Indiana Zc 05000315 50-316 Donald C. Cook Nuclear Power Plant( Unit 2( Indiana Sc 05000316 AUTH. NAME AUTHOR AFFILIATION ALEXICH( M. P ~ i Indiana lk Mich gan Elec tr i c Co.

RECIP. NAME RECIPIENT AFFILIATION l lURLEY( T. E. NRC No Detailed Affiliation Given

SUBJECT:

Part 21 rept re DISTRIBUTION CODE: IEIVD CQPIES RECEIVED: LTR I ENCL Q SIZE:

TITLE: Part 21 Rept (50 DKT)

NOTES:

RECIP IENT COP IES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD3-3 LA PD3-3 PD WI QGINQTON. D INTERNAL'EOD/DOA AEQD/DBP/TPAB 1 ARM TECH ADV NRR CRUTCHFIELD 1 NRR VARQA> S NRR/DEBT/ADE 1 NRR/DEBT/*DB NRR/DLPG/G*B 1 NRR/DOEA/E*B NRR/DOEA/GCB 1 NR VIB NRR/PMAS/ ILRB 1 G F E RES DEPY GI 1 E/EIB RQN1 1 RGN2 RQN3 1 RGN4 RGN5 1 EXTERNAL: INPO RECORD CTR LPDR 1 1 NRC PDR NBIC SILVER( E 1 1 TOTAl NUMBER OF CQP IES REQUIRED: LTTR 27 ENCL Sate

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INDIANA 8 MICHIGAN ELECTRIC COMPANY P.O. BOX 16631 COLUMBUS, OHIO 43216 August 26, 1987 AEP:NRC:0971C Donald C. Cook Nuclear Plant Units 1 and 2 Docket Nos. 50-315 and 50-316 License Nos. DPR-58 and DPR-74 10 CFR 21 NOTIFICATION:

BEADS FOUND IN VALVE MOTORS U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555 Attn: T. E. Murley

Dear Dr. Murley:

Pursuant to 10 CFR 21, this letter is being submitted to provide written notification of the existence of a defect associated with motor-operated valves (MOVs) supplied to the D. C. Cook Nuclear Plant by Hammel-Dahl 6 Jamesbury Controls Company, Inc. through Midwest Controls Company, Inc. Initial notification was made in a telephone conversation be'tween representatives of the American Electric Power Service Corporation and Mr. D. C. DiIanni of the NRC Office of Nuclear Reactor Regulation on August 21, 1987.

On August 13, 1987, during the installation of four motor-operated valves in the Auxiliary Feedwater System at the D. C. Cook Nuclear Plant, metallic beads were found in the valve motor casings. The beads appeared to be of the type associated with an abrasive cleaning process.

The beads were found in one of the motors during installation of T-drain fittings for the motor casings. Noise being made by the va"ve motor during MOVATS (motor-operated valve analysis and test system) testing prompted disassembly of that motor. During the subsequent investigation for the remaining Unit 1 AC motors, beads were found in two of the three motors. The valve motors (575 VAC) were manufactured by Reliance Electric Company and sent to Limitorque Corporation to be installed on valve operators (Limitorque SMB-000). The entire motor-operator assemblies were then shipped to Hammel-Dahl & Jamesbury Controls Company, Inc., where they were mounted to the valves. The valves, with the motor operators attached, were received by the plant in May 1987 and installed during the current outage.

After the problem was discovered, it was analyzed by American Electric Power personnel, and on August 21, 1987, it was concluded that the beads found in the valve motors of the MOVs were sufficient to 8709040009 870826 PDR ADOCK 05000315 i

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Dr. T. E. Murley AEP:NRC:0971C BQ gpggg create a potential pPXqCy+azprd. This conclusion was based on the fact that we determined that: tKh beadQPcM3ld have either affected the mechanical rotation of the motor or created the possibility of the beads wearing into the winding insulation, thus causing failure of the motors and the electrical inoperability of safety-related valves' similar problem exists with at least one of the valve motors purchased but not installed for Unit 2 (the Unit 2 valves were scheduled to be installed during the next refueling outage). Six of the defective motors have been returned to Limitorque via Reliance Electric Company.

The remaining two have been returned directly to the Limitorque Corporation. We have received six refuibished motors from Limitorque and are presently installing four of these on Unit 1.

We are not aware of other facilities or activities subject to 10 CFR 21 for which these valve motors have been supplied.

This document has been prepared following Corporate procedures which incorporate a reasonable set of controls to insure its accuracy and completeness prior to; signature by the undersigned.

Very truly yours, P. A exic Vice Presid nt cm cc: John E. Dolan W. G. Smith, Jr. - Bridgman R. C. Callen G. Bruchmann G. Charnoff NRC Resident Inspector - Bridgman A. B. Davis - Region III

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