ML20028A010

Part 21 Rept Re Potential Defect in Component of Dsrv or Dsr Standby Diesel Generator.Problem Exists W/Engine Piston Skirt Casting Which Could Result in Engine Nonavailability

ML20028A010
Person / Time
Site:	Catawba, Harris, River Bend, Vogtle, Comanche Peak, 05000000
Issue date:	10/28/1982
From:	Boyer R TRANSAMERICA DELAVAL, INC.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
REF-PT21-82-723-000 82-723, PT21-82-723, PT21-82-723-000, NUDOCS 8211160262
Download: ML20028A010 (2)

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[J-743=ddc hglgggl 550 85th Avenue P.O. Box 2161 E'll flE Oakland. Cahfornia 94621 (415) 577-7400 October 28, 1982 Director, Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Sir:

D. accordance with the requirements of Title 10, Chapter 1, Code of Federal Regulations, Part 21, Transamerica Delaval, Inc. hereby notifies the Commission of a potential defect in a component of the DSRV or DSR Standby Diesel Generator. There exists a potential problem with the engine piston skirt casting which could result in engine non-availability.

Transamerica Delaval has supplied the DSR and DSRV engines to the following utilities:

Duke Power Company Catawba 5/N 75017 S/N 75018 S/N 75019

, S/N 75020 Tennessee Valley Authority Stride S/N 77026 77031 S/N 77027 77032 S/N 77028 77033 S/N 77029 7034 S/N 77030 77035 Texas Utilities Commanche Peak S/N %cA3 Gulf Statas Utilities Ri/er Bend S/N 74039 S/N 74040 Carolina Power & Light Shearon Harris S/N 74045 S/N 74047 Georgia Power Co. Vogtle S/N 76021 S/N 76022 S/N 76023 S/N 76024 At present none of these units have been placed in commercial operation.

The Piston Skirts were manufactured and installed in the engine by Transamerica Delaval.

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. e Transamenca Delaval liR9Ei U. S. Nuclear Regulatory Commission October 28, 1982 Page 2 The potential problem is the possibility of residual stress caused by the method of heat treating of Piston Skirts used between December 1978 and October 1981.

This residual stress in combination with operating stress could cause cracking of the Piston Skirt during operation which could result in engine failure if undetected.

We recommend that the Pistons be removed from the engines and returned to Transamerica Delaval's plant in Oakland, Calif. Transamerica Delaval will inspect, stress relieve, and return the Pistons for reinstallation.

Any Piston Skirts which are found defective will be replaced.

A copy of this letter will be sent to each of the cognizant parties listed in paragraph 2 no later than November 18, 1982. Transamerica Delaval has in stock sufficient Piston Skirts and related parts to handle this change.

The engine Instruction Manual contains instructions on how to replace Pistons, and each site has a copy of the Instruction Manual. Transamerica Delaval will furnish related parts and technical services as required upon request and in accordance with each individual contract.

All of the sites involved are in various states of constr uction, so we can-not estimate when the change out will be completed. Removal of Pistons re-quires the ability to bar the engine over. This can only be done after the engine is installed on its foundation and the flywheel has been installed.

Our evaluation of this matter was concluded on October 27, 1982.

Sincerely, R f by R. E. Boyer, Manager Quality Assurance REB:hw