ML20078A322
| ML20078A322 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 01/12/1995 |
| From: | Terry C TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | Callan L NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 1-SR-94-002-00, 1-SR-94-2, TXX-95013, NUDOCS 9501240362 | |
| Download: ML20078A322 (2) | |
Text
..
5 *t j
g Log # TXX-95013 File # 10200 10250 i
905a l
C C
Ref. # 10CFR50.36(c)(5) nlELECTRIC d00U0I7 12* 1995 l
c Lance Twry c,,,,, m w l
Mr. L. J. Callan U. S. Nuclear Regulatory Commission Region IV h
611 Ryan Plaza Dr.. Suite 400 Arlington. TX 76011
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES) - UNIT 1 DOCKET N0. 50-445 EMERGENCY DIESEL GENERATOR START AND LOAD-RUN EVENTS DURING TESTING SPECIAL REPORT NO. 1-SR-94-002-00
Dear Sir:
Enclosed is a 30 day Special Report submitted in accordance with CPSES Unit 1 and Unit 2 Technical Specification 3/4.8.1. " Electrical Power Systems. A.C. Sources" Sincerely.
N C. L. Te ry i
i 1
OB/cc i
Enclosure c-iMRC? Document Control Desk Mr. D. D. Chamberlain. Region IV Mr. T. J. Polich. NRR Resident Inspectors i
g2fhhh h00 5
P.O. Box 1002 Olen Rose, Tease 76%3
yY f
Enclosure to TXX-95013 Page 1 of 1 i
l TU ELECTRIC COMANCHE PEAK STEAM ELECTRIC STATION - UNIT 1 SPECIAL REPORT NO, 1 SR 94 002 00 EMERGENCY DIESEL GENERATOR START AND LOAD RUN EVENTS l
DURING TESTING l
1.0 Report Requirements This Special Report is submitted in accordance with Comanche Peak Steam Electric Station (CPSES) Unit 1 and Unit 2 Technical Specification 3/4.8.1. " Electrical Power Systems A.C. Sources" Surveillance Requirement 4.8.1.1.3 requires that all Diesel Generator failures, valid or non-valid, be reported to the Nuclear Regulatory Commission in a Special Report pursuant to Technical Specification 6.9.2 within 30 days.
2.0 Event Description On December 22, 1994, at approximately 12:21 p.m. CST. Unit 1 Train A Emergency Diesel Generator (EDG) 1-01 (Component Tag Number CP1-MEDGEE-01) was manually started from the Control Room by Operations personnel for a Train A Diesel Generator Load Performance test. The engine tripped at approximately 12:41 p.m. CST due to the spurious actuation of a low lube oil pressure switch.
3.0 Corrective Actions The trip device was replaced with a new, calibrated pressure switch.
4.0 Evaluation Rasults The trip experienced on December 22, 1994, was attributed to an internal oil leak of a trip device that is bypassed in the emergency operating mode. A low lube oil pressure condition did not exist.
The condition causing the trip would not have resulted in the failure L
of the diesel generator unit to start, accelerate, and load during a response to an actual emergency start signal.
Consistent with the guidance of Regulatory Position C.2.e(2) of Regulatory Guide 1.108, the trip is not considered a valid test or failure.
The current test interval requires that the unit be demonstrated i
operable at least once per 31 days by verifying that the unit starts I,
from ambient conditions and achieves design rated speed, frequency, q
and voltage within the specified time limit. The problem experienced i
on December 22, 1994, did not constitute a valid test or failure.
Therefore, this event does not impact the test interval currently in progress.
l l
l i-
.