ML17272A624

Deficiency Rept:On 790717,tests Indicated That Diesel Repeat Start Operating Modes Could Result in Turbocharger Thrust Which Might Cause Turbocharger Failure.Improved Tube Oil Sys Being Developed by Electro-Motive

ML17272A624
Person / Time
Site:	Columbia
Issue date:	08/02/1979
From:	WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:
Shared Package
ML17272A622	List: ML17272A623 ML17272A624
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 7909100252
Download: ML17272A624 (1)

Text

REPORTED DEFICIENCY AND CORRECTIVE ACTION FOR DIESEL ENGINE TRUBOCHARGER THRUST QEARING PROBLEM NATURE OF DEFICIENCY Stewart/Stevenson informed Burns 5 Roe by letter, dated May 29, 1979, that the Electro-Motive Division of General Motors Diesel Engines, furnished by them as part of the emergency onsite power system, may have a potential problem with the turbocharger thrust bearing.

Recent lubricating oil system tests conducted at Electro-Motive indi-cate that certain repeat start operating modes could result in tur bo-charger thrust bearing damage which might ultimately cause a turbo-charger failure.

This problem has been identified in IE Circular No.'9-12, dated June 28, 1979.

lie have determined that the two emergency onsite power systems and the HPCS system use the Electro-Motive diesel engines with the potential turbocharger problem.

SAFETY IMPLICATIONS Failure of the turbocharger would result in a failure of the diesel generator to perform its intended function, and would reduce the Emergency Core Cooling Systems below minimum requirements.

CORRECTIVE ACTION TAKEN AND PLANNED Electro-Motive is currently working on the development of an improved lube oil system. The system will be available for installation on our units in the near future. The modification kits will be installed prior to system startup testing.

g 909100 2++