ML20116B586
| ML20116B586 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 02/25/1985 |
| From: | Keiser H PENNSYLVANIA POWER & LIGHT CO. |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| PLAS-044, PLAS-44, NUDOCS 8504250557 | |
| Download: ML20116B586 (2) | |
Text
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PPat P nnsylv:nia Power & Light Company Two North Ninth Street
- Allentown, PA 18101
- 215 / 770 5151 February 25, 1985 Dr. Thomas E. Murley Regional Administrator, Region I U.S. Nuclear Regulatory Ccumission 631 Park Avenue.
King of Prussia, PA 19406 SUSQUEHANNA STEAM ELBCTRIC STATION SPECIAL REPORP - NON-VALID DIESEL FAILURE ER 100450 FILE 841-23 PLAS-044 Docket No.
50-387 License No. NPF-14
Dear Dr. Murley:
This special report documents the "B" Diesel Generator Non-Valid Failt.re as required by Regulatory Guide 1.108, Section C.3.b, and Technical Specification 4.8.1.1.3.
Regulatory Guide 1.108, Section C.3.b, requires reporting all diesel generator unit. failures, valid or invalid. At 0033 and 0049 on January 25, 1985, the "B" Diesel Generator tripped. The connecting rod high tmperature alarm annunciated at the time of the trip. Mechanical Maintenance investigated the connecting' red high temperature condition and determined the connecting rod bearing high temperature detector vent valve tripped in the upward position, at position SL. 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 was not hot enough to melt the eutectic alloy. Werefore, tia vent valve was tripped by sme other means. The connecting rod high tmperature condition is bypassed in the emergency node, therefore a. spurious trip caused by the connecting rod high temperature system would not be designated as a valid failure. The vent valve was reset and the diesel was successfully restarted at 0538 on January 25, 1985.
21s particular vent valve has previously tripped under the same conditions.
In order to preclude a recurrence, a Work Authorization has been initiated to replace this vant valve.
8504250557 850225 PDR ADOCK 05000387
.Y S
PDR ty" 4/'\\P
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e The Diesel Generator Start Iog indicates there is one (1) diesel failure in the last one-hundred '(100) starts. 'the diesels are on a test interval of every thirty one (31) days, per Regulatory Guide 1.108, Section C.2.d.
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H.W. Keiser Superintendent of Plant-Susquehanna RHS/ Pig cc: Mr. R.H. Jacobs Senior Resident Inspector U.S. Nuclear Regulatory Ccmnission PO Bco: 52 3
Shickshinny, PA 18655
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_ U.S. Kbclear Regulatcry Ccunission f:
Document Control Desk Washington, DC 20555 L
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