ML20206U059

Part 21 Rept Re Potential Defect in Component of Dsrv Standby Diesel Generators,Involving Problem W/Fastening of Engine Connecting Rod Assembly Which Could Result in Engine Nonavailability.Procedure Will Be Issued by 860718

ML20206U059
Person / Time
Site:	Perry, Catawba, Harris, Vogtle, San Onofre, Comanche Peak, Midland, Bellefonte, 05000000, Washington Public Power Supply System, Hartsville
Issue date:	07/02/1986
From:	Guntrum B TRANSAMERICA DELAVAL, INC.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
REF-PT21-86, REF-PT21-86-246-000 PT21-86-246, PT21-86-246-000, NUDOCS 8607080302
Download: ML20206U059 (4)

Text

Transamerica naa=='" c= o.' "ac Enterprise Engine Division 1/

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P.o. Box 2161 8

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oakland, Cahfornia 94621 \ j (415) 577 7400 g%

July 2, 1986 Director, Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555

Dear Sir:

In accordance with the requirements of Title 10, Chapter 10, Code of Federal Regulations, Part 21, Transamerica Delaval Inc., hereby notifies the Commission of a potential defect in a component of a DSRV Standby Diesel Generator. There exists a potential problem with the fastening of the engine's connecting rod assembly which could result in engine non-availability.

Transamerica Delaval has supplied DSRV engine with this potential defect to the following sites:

Utility Site Serial # Model Carolina Power Shearon Harris 74046/49 DSRV-16-4 Duke Power Catawba 75017/20 DSRV-16-4 So. Cal. Edison San Onofre 75041/42 DSRV-20-4 Cleveland Electric Perry 75051/54 DSRV-16-4 TVA Bellefonte 75080/83 DSRV-16-4 Washington Public WPPS 1 75084/85 DSRV-16-4 Texas Utilities Comanche Peak 76001/04 DSRV-16-4 Georgia Power Vogtle 76021/24 DSRV-16-4 Consumers Power Midland 77001/04 DSRV-12-4 TVA Hartsville 77024/35 DSRV-16-4 S

The connecting rod assemblies are manufactured by Transamerica Delaval in Oakland, California and utilize 1-1/2 inch rod bolts with a design torque of 1,750 foot pounds. They are installed one per crankthrow (6 pieces in a 12 cylinder, 8 pieces in a 16 cylinder or 10 pieces in a 20 cylinder engine) by Transamerica Delaval or provided as spare parts.

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(415) 577 7400 100 Years U.S. Nuclear Regulatory Commission Page 2 We have experienced isolated failures of this connecting rod assembly in commercial applications. In December 1983, two such connecting rod assemblies were found cracked after approximately 13,000 total operating hours in a twelve cylinder engine used for ship propulsion. In October 1985, a third assembly was found cracked in the same service on a sister ship after 20,800 operating hours. These engines use heavy residual fuel oil and are rated at higher levels than any of the nuclear emergency diesel generator engines.

Additionally, they have been regularly subjected to overload beyond nameplate rating accumulating an average of approximately 20,000 operating hours.

These failures have occurred within 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br /> of engine maintenance which involved disassembly of the subject connecting rods. Our investigation reveals that the connecting rod cracking was caused by an insufficient clamping force applied through the rod bolting. Abuse in handling and engine overloading may also have contributed to the failures. It should finally be noted that these 3 rods represent less than

.5 percent of the 850 rods of this design in service with an average of 7500 operating hours.

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At this time, there is no specific action required on the part of the engine user. Transamerica Delaval will publish a procedure by July 18, 1986 providing instructions to ensure that the specified clamping force is accurately applied to the connecting rod bolts; specialized equipment such as an ultrasonic bolt stretch measuring device is being evaluated.

No change is anticipated in the torque values given in the engine instruction manuals.

A copy of this letter will be sent to all of the sites referenced in paragraph 2 of this letter as indicated by the carbon copy list.

Our evaluation of this potential problem was completed on June 30, 1986.

si Lyqq Jr. -

B.C. Gunt Manage H, ymuality Assurance BCG:ddm t

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. DeLaval cc: Tennessee Valley Authority W7C126, 400 West Summit Hill Drive Knoxville, Tennessee 37902 Attn: Mr. I.L. Beltz Washington Public Power Supply System Post Office Box 460 Richland, WA 99352 Attn: Mr. G.K. Dyekman Acting Asst. Program Director Texas Utilities Services Inc.

P.O. Box 2300 Glen Rose, Texas 76043 Attn: Mr. J.T. Merritt, Jr. j Engineering & Construction Manager Bechtel Power Corporation P.O. Box 60860 Terminal Annex Los Angeles, CA 90060 Attn: Project Engineer Georgia Power Company - Plant Vogtle Bechtel Job 9510-001 File X4AK01 Consumers Power Company 1945 West Parnall Road Jackson, Michigan 49201 Attn: J.W. Cook, Vice President Projects Tennessee Valley Authority - Harteville W 10 D224-400 Commerce Avenue Knoxville, Tennessee 37902 Attn: Mr. C.A. Chandley, Chief Mechanical Engineering Branch Georgia Power Company Plant Vogtle P.O. Box 282 Waynesboro, Georgia 30830 Attn: Mr. George Bockhold, Jr.

Plant Manager 1

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cc: Carolina Power & Light Company Shearon Harris Nuclear Plants P.O. No. 101 New Hill, North Carolina 27562 Attn: Mr. R.A. Watson, Vice President Duke Power - Catawba Mill Power Supply Company P.O. Box 32307 Charlotte, North Carolina 28232 Attn: W.T. Robertson, President Southern California Edison P.O. Box 800 Rosemead, CA 91770 Attn: Q.A. Manager Cleveland Electric Illuminating Company c/o Perry Nuclear Power Plant P..O. Box 97 Perry, Ohio 44081 Attn: Mr. C.M. Shuster, Manager Nuclear Quality Assurance l