ML18101B158
| ML18101B158 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 12/29/1995 |
| From: | Warren C Public Service Enterprise Group |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 95-02, 95-2, LR-N95253, NUDOCS 9601050098 | |
| Download: ML18101B158 (4) | |
Text
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OPS~G Public Service Electric and Gas Company P.O. Box 236 Hancocks Bridge, New Jersey 08038-0236 Nuclear Business Unit D~C 2 9 1995 LR-N95253 U. S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 Gentlemen:
SPECIAL REPORT 95-02 SALEM GENERATING STATION - UNIT 1 FACILITY OPERATING LICENSE NO. DPR-70 DOCKET NO. 50-272 This Special Report regarding a valid failure of the lA Emergency Diesel Generator is being submitted pursuant to the requirements of Technical Specification 4.8.1.1.4.
Attachment SORC Mtg.95-157 JEH/tcp C
Distribution LER File 3.7 9601050098 951229 PDR ADOCK 05000272 S
PDR 050018 The re'\\\\ er is in \\t'Lir hands.
Sincerely,
~ (~cluu~
c1U Warren General Manager -
Salem Operations
/i~Jt Y
I I 95-2168 REV. 6'94
SPECIAL' REPORT 95-02 PLANT IDENTIFICATION:
Salem Generating Station - Unit 1 Facility Operating License No. DPR-70 Docket No. 50-272 DESCRIPTION OF OCCURRENCE:
On December 7, 1995, a valid failure of the lA Emergency Diesel Generator (EDG) was identified approximately 23 and 1/2 hours into a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> endurance surveillance test.
The endurance test was being performed in accordance with Technical Specification 4.8.1.1.2d.7.
The lA EDG developed an unisolable lubricating oil leak at a threaded piping nipple between the main lubricating oil header and an instrument root valve.
The leak was quantified to be a total of four (4) gallons. The lA DG was shut down and subsequently declared inoperable. The threaded nipple was replaced, and the lA EDG was satisfactorily tested on December 10, 1995.
PLANT CONDITIONS:
The plant was defueled during the period that the lA 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 Sper.ial 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 Regulatory 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, Revj_sior, 1, August 1977:
- 1.
Diesel Generator unit involved:
lA
- 2.
Number of failures in the last 100 tests:
a)
This was the sixth failure of the lA EDG in the last 100 valid tests.
b)
This was the fifth failure of any Unit 1 EDG in the last 100 valid tests
- 3.
Cause of the failure:
a)
The apparent cause of the lubricating oil leak was attributed to fatigue due to normal machine vibration.
- 4.
Corrective measures taken:
a)
The threaded nipple was replaced, and the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> endurance surveillance test on lA EDG was satisfactorily completed on December 10, 1995.
b)
A Design Change Package (DCP) has been initiated for all Unit 1 and 2 diesel generators to address vibration induced piping failures.
c)
The failed threaded nipple has been sent to an offsite laboratory for failure analysis.
d)
An analysis of the Unit 1 EDG failure trend has been initiated.
The need for additional corrective actions will be evaluated following the analysis.
- 5.
Length of time the EDG was out of service:
a)
The lA EDG was out of service for repairs to the lubricating oil instrument line for approximately 55 hours6.365741e-4 days <br />0.0153 hours <br />9.093915e-5 weeks <br />2.09275e-5 months <br />.
- 6.
Define the current surveillance test interval:
a)
The lA DG is on a monthly surveillance test frequency as required by TS 4.8.1.1.2a.
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SAFETY SIGNIFICANCE There was no impact on plant safety due to faiJure of the lA EDG.
The.iA :...:::; was not required in the defuelE*c'. plant conditions.