ML20099B932
| ML20099B932 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 10/26/1984 |
| From: | Keiser H PENNSYLVANIA POWER & LIGHT CO. |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| PLAS-001, PLAS-1, NUDOCS 8411190346 | |
| Download: ML20099B932 (2) | |
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- PP&L Pennsylvania Power & Light Company Two North Ninth Street
- Allentown,'PA 18101
- 215/ 770 5151 October. 26, 1984 Dr. Thomas E. Murley Regional Administrator, Region i U.S. Nuclear Regulatory Commission 631. Park Avenue King of Prussia, PA 19406
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SUSQUEHANNA STEAM ELECTRIC STATION SPECIAL REPORT - NON-VAllD DIESEL FAILURE ER 100450 FILE 841-23 Docket No.
50-387 PLAS - 001 License No. NPF-14 Dea r Dr. Murley:
This special report documents the "A" Diesel Generator Non-Valid Failure as required by Regulatory Guide 1.108, Section C.3.b, and Technical 3
SpectfIcation 4.8.1.1 3 Regulatory Guide 1.108, Section C.3.b, requires reporting all diesel generator unit failures, valid or invalid. At 1300 on September 26,.1984, the "A" Diesel Generator tripped approximately thirty (30) minutes into a one (1) hour loaded run. The connecting rod high temperature alarm annunciated at the time of the trip. Mechanical Maintenance investigated the connecting rod high temperature condition under WA-S44784. Upper crankcase door SL was removed, which revealed the connecting rod bear-Ing high temperature detector vent valve tripped in the upward position.
The detector, an eutectic fusable rod, is mounted on the connecting rod, and actuates a vent valve under high temperature conditions. Mechanical Maintenance inspected the detector and found the fusable rod intact (not extended), indicating this connecting rod bearing had not got hot enough to melt the eutectic alloy. Therefore, the vent valve was tripped by some other means. The connecting rod high temperature condition is by-passed in the emergency mode, therefore a spurious trip caused by the connecting rod high temperature system would not be designated as a valid failure. The most likely reason for the tripped vent valve is not being properly seated on the detent. This would cause the valve to be very sensitive to external forces (vibrations, oli splashing).
A note will be added to diesel maintenance procedures wherein crankcase doors are removed, to check for proper setting of the vent valve trip arm prior to replacing doors.
8411190346 841026 PDR ADOCK 05000387 S
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.Th'ere are five (5) diesel failures-In the -last one-hundred (100);sta'rts.
zVie diesels are on a test j interval ~of, every three (3) days, per. Regulatory
- Guide 1.108,.Section C.2.d.
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Superintendent of. Plant-Susquehanna -
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Mr. R.H. Jacobs Senior Resident i ns'pecto r-U.S. Nuclear Regulatory-Commission PO Box 52-Shickshinny,: PA :18655 U.S.: Nuclear Regulatory Commission Document Control-Desk W shington, DC 20555
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