ML20086R517
| ML20086R517 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 07/25/1995 |
| From: | Geoffrey Edwards PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9507310165 | |
| Download: ML20086R517 (2) | |
Text
'
Ocreett D. Etw2r$a g
3 Plant Manager
~
Peach Bottom Atomic Power Stahon a-o Y
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O mmGY-ecco tee <ovce-n v.
RD 1. Box 208 Delta. PA 17314-9739
_y 717 456 4244 l
July 25, 1995 l
.i' Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555 i
l Docket Nos.
50-277 50-278 l
Ucense Nos.
DPR-44 DPR-56
[
SUBJECT:
Peach Bottom Atomic Power Station - Unit 2 & 3 Special Report for a Valid Failure of the E-1 Diesel Generator on 6/28/95
REFERENCE:
Peach Bottom Atomic Power Station Technical Specification (Tech Spec) 4.9.A.1.2.L and M This' Special Report is submitted pursuant to.the requirements of Tech Spec 4.9.A.1.2.M. : This Surveillance Requirement requires reporting of all Diesel.
Generator (D/G) failures, valid or non valid, within 30 days. This report is required to include the information recommended in Regulatory Position C.3.b of Regulatory Guide (RG) 1.108 " Periodic Testing of Diesel Generator Units as Onsite Electric j
Power System at Nuclear Power Plants", Revision 1, August 1977.
l 1
On 6/30/95 at 1950 hours0.0226 days <br />0.542 hours <br />0.00322 weeks <br />7.41975e-4 months <br /> with Unit 2 at 100% power and 3 at 77% power, it was -
determined that the number 12 cylinder on the E-1 D/G had lower than normal l
operating temperatures during the performance of a Surveillance Test (ST)-O 411-2 "E-1 DIESEL GENERATOR FULL LOAD FAST START TEST". In addition, it was discovered that fuel oil was spraying from the vent _ oil drain line.
An investigation was immediately conducted to determine the cause of the low cylinder 1
temperature condition. The cause was determined to be the failure of one of the j
two fuel oilinjector pumps on the number 12 cylinder. The E-1 D/G was declared inoperable.
The E-1 D/G number 12 cylinder injector pump was replaced, satisfactorily tested, j
and returned to an operable status on 7/01/95 at approximately 1815 hours0.021 days <br />0.504 hours <br />0.003 weeks <br />6.906075e-4 months <br />. The cause of the failure is still under investigation'and the fuel oil injector pump has been sent to the manufacturer for failure analysis. The inoperability determination is based on a review of the Electrical Loading Studies for this D/G. This review.
could not ensure that the D/G could maintain the maximum design bases loads as specified in the SAR.
j CCN 95-14064 950731o165 95o725
/ N PDR ADOCK 05ooo277
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-S-PDR
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U. S. Nuclear Regulatory Commission Page 2 The E-1 D/G failure was classified as a valid failure using the guidance of RG 1.108, Revision 1,1977. Because this occurrence was classified as a valid failure and the first valid failure in the last 100 valid tests, the current surveillance testing interval will remain at once per 31 days which is in conformance with RG 1.108, Revision 1, Section C.2.d.
The E-1 D/G was unavailable for operation approximately 9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br />, however, the D/G was available but considered Tech Spec inoperable for the remainder of the event. Although the E-1 D/G was Tech Spec inoperable, it would have started on an initiation signal. If a design basis Loss of Coolant Accident / Loss of Offsite Power condition would have occurred when one of the fuel oil injector pumps was failed, the E-1 D/G may not have been able to maintain the necessary electrical parameters for all scenarios as described in the SAR. The remaining D/Gs were operable and would have provided adequate AC power to safety related loads in the event of an actualloss of offsite power.
If you have any questions or require additional information, please do not hesitate to contact us.
Sincerely,
)
GDE/GAJ:gaj cc:
R. A. Burricelli, Public Service Electric & Gas R. R. Janati, Commonwealth of Pennsylvania T. T. Martin, US NRC, Region i R. l. McLean, State of Maryland W. L. Schmidt, US NRC Senior Resident inspector H. C. Schwemm, Atlantic Electric A. F. Kirby lil, DelMarVa