ML18101B154
| ML18101B154 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 12/27/1995 |
| From: | Warren C Public Service Enterprise Group |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 95-001, 95-1, NUDOCS 9601030032 | |
| Download: ML18101B154 (3) | |
Text
OPS~G Public Service Electric and Gas Company P.O. Box 236 Hancocks Bridge, New Jersey 08038-0236 Nuclear Business Unit DEC 2 7 1995 LR-N95251 U. S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 Gentlemen:
SPECIAL REPORT 95-01 SALEM GENERATING STATION -
UNIT 1 FACILITY OPERATING LICENSE NO.DPR-70 DOCKET NO.
50-272 This Special Report regarding a valid failure of the lB Emergency Diesel Generator is being submitted pursuant to the requirements of Technical Specification 4.8.1.1.4.
Attachment SORC Mtg.95-155 BMW/kjb c
Distribution LER File 3.7 9601030032 6~b55~72
~DR ADOCK PDR 1l1e power is in vour hands.
Sincerely, (fdc~
Cla~arren General Manager -
Salem Operations 020108
/if:J) I
.JV I
95-2168 REV. 6/94
SPECIAL REPORT 95-01 PLANT IDENTIFICATION:
Salem Generating Station - Unit 1 Facility Operating License No. DPR-70 Docket No. 50-272 DESCRIPTION OF OCCURRENCE:
On November 29, 1995, a valid failure of the lB Emergency Diesel Generator (EDG) was identified During a routine monthly surveillance test.
The lB EDG exceeded the frequency stabilization acceptance criteria of 13 seconds by 2.79 seconds.
The failure to meet the test acceptance criteria was due to a malfunction of the Woodward Electronic Governor Control unit (the EGA unit). The EGA unit was replaced, and the lB EDG was tested satisfactorily on December 14, 1995.
PLANT CONDITIONS:
The plant was defueled during the period that the lB EDG was not operable.
REPORTING REQUIREMENT:
This failure is being reported as required by Technical Specification 4.8.1.1.4 which states:
All diesel generator failures, valid or non-valid, shall be reported to the Commission in a Special Report pursuant to Specification 6.9.2 within 30 days.
Reports of diesel generator failures shall include the information recommended in Regulatory Position C.3.b of Reg~latory Guide 1.108, Revision 1, August 1977. If the number of failures in the last 100 valid tests (on a per nuclear unit basis) is greater than or equal to 7, the report shall be supplemented to include the additional information recommended in Regulatory Position C.3.b of Regulatory guide 1.108, Revision 1, August 1977.
REPORT DETAILS:
The following information is provided as specified in Regulatory Position C.3.b of Regulatory Guide 1.108, Revision 1, August 1977:
- 1.
Diesel Generator unit involved:
lB
- 2.
Number of failures in the last 100 tests:
,.. r a)
This was the fourth failure of the lB EDG in the last 100 valid tests.
b)
This was the fourth failure of any Unit 1 EDG in the last 100 v&~id tests.
- 3.
Cause of the failure:
a)
The failure to meet the test acceptance criteria time was due to a malfunction of the Woodward Electronic Governor Control unit (the EGA unit).
Troubleshooting of the EGA unit indicated a failure in the speed clamping and pull back circuitry.
- 4.
Corrective measures taken:
a)
The EGA unit for the lB EDG governor was replaced, and the lB EDG was tested satisfactorily on December 14, 1995.
b)
The faulty EGA unit was shipped to the Vendor (Woodward) for failure analysis.
Additional corrective actions will be evaluated following the vendor failure analysis.
c)
An analysis of the Unit 1 EDG failure trend has been initiated.
Additional corrective actions will be evaluated following the analysis.
- 5.
Length of time the EDG was out of service:
a)
Between November 29 and December 14, the lB EDG was considered inoperable, but fully functional for the existing plant conditions, except during actual replacement of the EGA unit.
The out of service time for replacement of the EGA unit was 33.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />.
- 6.
Define the current surveillance test interval:
a)
The lB DG was placed on a seven day surveillance test frequency as required by TS 4.8.1.1.2a.
This interval is required following two or more failures in the last twenty tests on a per diesel generator basis.
SAFETY SIGNIFICANCE There was no impact on plant safety due to failure of the lB DG EGA unit. The lB DG was not required for the defueled plant conditions, but should have been sufficiently functional, even with the degraded EGA unit, to provide emergency power if called upon to operate.