ML17223B105
| ML17223B105 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 02/15/1991 |
| From: | Sager D FLORIDA POWER & LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| L-91-55, NUDOCS 9102250239 | |
| Download: ML17223B105 (3) | |
Text
ACCELERATED DI~BUTION DEMONS'TION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
"ACCESSION NBR:9102250239 DOC.DATE: 91/02/15 NOTARIZED: NO FACIL:50-389 St. Lucie Plant, Unit 2, Florida Power
& Light Co.
AUTH.NAME AUTHOR AFFILIATION SAGER,D.A.
Florida Power
& Light Co.
RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
DOCKET 05000389
SUBJECT:
Special rept: on 910116,troubleshooting revealed defective immit switch assembly on 2B2-governor of EDG.Switch assembly replaced
&'2B EDG successfully retested.Sys engineer will track limit switch for each EDG.
1 DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR 'i ENCL l SIZE:
TITLE: 50.73/50.9 Licensee Event Report (LER), Incident Rpt, etc.
NOTES:
RECIPIENT ID CODE/NAME PD2-2 LA NORRIS,J ZNTERNAL: ACNW AEOD/DOA AEOD/ROAB/DSP NRR/DET/EMEB 7E NRR/DLPQ/LPEB10 NRR/DREP/PRPBll NRR/DST/SICB 7E NRR/DST/SRXB 8E RES/DSIR/EIB EXTERNAL: EG&G BRYCE,J.H NRC PDR NSIC MURPHY,G.A COPIES LTTR ENCL 1
1 1
1 2
2 1
1 2
2 1
1.
1 1
2 2
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RECIPIENT ID CODE/NAME PD2-2 PD ACRS AEOD/DSP/TPAB NRR/DET/ECMB 9H NRR/DLPQ/LHFB11 NRR/DOEA/OEAB NRR/DST/SELB 8D NRR DS SPLB8D R
FIL 1
L ST LOBBY WARD NSIC MAYS,G NUDOCS FULL TXT COPIES LTTR ENCL 1
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1 NOTE TO ALL"RIDS" RECIPIENTS:
PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM P 1-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!
TOTAL NUMBER OF COPIES REQUIRED:
LTTR 33 ENCL 33
P.O. Box 128, Ft. Pierce, FL 34954-012B FPL February 15, 1991 L-91-55 10CFR50.36 U.
S Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 Gentlemen:
,Re:
St. Lucie Unit 2 Docket No. 50-389 Special Report Date of Event:
January 16, 1991 Emer enc Diesel Generator Failure The attached Special Report is being transmitted pursuant to the requirements of St. Lucie Unit 2 Technical Specification 4.8.1.1.3 and pursuant to Technical Specification 6.9.1 The report provides notification of a 2B Emergency Diesel Generator failure during post maintenance testing.
Should'there be any questions on this information, please contact us Very truly yours, D. A.
ager Vice P esident St.
cie Plant DAS:GRM:kw DAS/PSL 0357 Attachment cc:
Stewart D. Ebneter, Regional Administrator, Region II, USNRC Senior Resident Inspector, USNRC, St. Lucie Plant 9i,02250239 910215 PDR ADOCK 05000389 S
/pg8
(((
At 1730 hours0.02 days <br />0.481 hours <br />0.00286 weeks <br />6.58265e-4 months <br /> on January 16, 1991 the St. Lucie Unit 2 2B Emergency Diesel Generator,(EDG) was idle started for post-maintenance testing following a preventative maintenance oil changeout.
The 2B EDG was synchronized to the grid
.but could only be loaded to approximately 2000 KW. The 2B EDG was shutdown for investigation of the problem.
Troubleshooting revealed a defective limit switch assembly in the 2B2 governor.
The limitswitch controls positioning of the governor
'peed setting.
In the stand-by mode, the governor speed setting is at 450 RPM. The starting logic raises the engine speed to 900 RPM with a 125V DC motor. The limit switch controls the 125V DC motor. The defective limit switch was replaced with a new switch.
At 1921 hours0.0222 days <br />0.534 hours <br />0.00318 weeks <br />7.309405e-4 months <br /> on January 17, 1991, the 2B EDG was started for a surveillance run.
'he start time was 8.94 seconds.
The EDG operated properly and the surveillance run was completed satisfactorily. The 2B EDG was declared back in service at 2110 hours0.0244 days <br />0.586 hours <br />0.00349 weeks <br />8.02855e-4 months <br /> on January 17, 1991.
In accordance with NRC Regulatory Guide 1.108 C.2.e.8, this event was evaluated to be a valid failure because the affected governor kept the EDG from fully loading and meeting its design basis criteria.
In accordance with the Unit 2 Technical Specification 4.8.1.1.3, this event is being submitted as a valid failure of the 2B Emergency Diesel Generator.
Corrective Actions:
- 1) The defective limit switch assembly was replaced.
- 2) The 2B EDG was successfully retested.
- 3) The System Engineer willtrack failures of this limitswitch for each EDG to verify that this corrective action is sufficient.
Failure Summary:
The failure of the 2B EDG was the third failure in the last 100 tests.
In conformance
'with the St. Lucie Unit 2 Technical Specification Surveillance Requirement 4.8.1
~1.2.a., Table 4.8-1 "Diesel Generator Test Schedule," the surveillance frequency remains at once per 31 days.
This is the first failure of this limit switch on any of the EDGs at St. Lucie.