ML20087B749
| ML20087B749 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 10/11/1991 |
| From: | Matthew Mitchell MKW POWER SYSTEMS, INC. |
| To: | Murley T Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20087B753 | List: |
| References | |
| REF-PT21-91 NUDOCS 9201130273 | |
| Download: ML20087B749 (1) | |
Text
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October 11, 1991 Mr. Thomas Murley Director - Office of Nuclear Reactor Regulation 11555 Rockville pike Rockville, MD 20852
Subject:
potential Reportable Defect for EMD 645 Series Camshaft Bearing Block Assembly Mounting Bolt (EMD #188146)
Dear Sir:
On 10/10/91, MKW power Systems received notification that, upon disassembly of the failed San Onofre Unit #2 diesel engine, seven (7) camshaft bearing block assembly mounting bolts (EMD #188146) were shorter than the required length (4-7/16" versus 4-5/8").
The bolts have a tolerance of
+0,
-3/32"; therefore, the bolts are short by 3/32" from allowable minimum dimension.
A total quantity of 80 bolts (4 per cylinder) are utilized on the 20 cylinder EMD series engine.
EMD is currently evaluating this issue and we will issue a report as soon as we obtain the results.
We do not have any reports of failures of the camshaft bearing block mounting bolts on any EMD engines which have been in service (nuclear as well as commercial service).
At the present time, we do not believe that the shorter bolts used in this application will degrade the tngine.
Yours very trul y, MKW POWER SYSTEMS, INC.
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M. Vann Mitchell Quality Manager MVM:jb
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Post Office Box 1928 e Rocky Mount. Nortn Carchna 27802-1928. Phone- (919) 977-2720
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