ML17221A500

Special Rept:On 871005,emergency Diesel Generator 2B Took Greater than 17 to Start Up & Load Onto Bus.Caused by Failure of Governor of Engines.Mechanical Section of Governor Replaced

ML17221A500
Person / Time
Site:	Saint Lucie
Issue date:	11/09/1987
From:	Woody C FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
L-87-457, NUDOCS 8711130206
Download: ML17221A500 (3)

Text

REGULA kY INFORMATION DISTR IBUTI( SYSTEM (RIDS)

ACCESSION NBR: 8711130206 DOC. DATE: 87/1 1/09 NOTARIZED: NO DOCKET FACIL: 50-38'P St. Lucie Planti Unit 22 Florida Power h Light Co. 05000389 AUTH. NAME AUTHOR AFFILIATION WOODY'. O. Florida Power 8< Light Co.

RECIP. NAME RECIPIENT AFFILIATION.

Document Control Branch (Document Control Desk>

SUBJECT:

Special rept: on 871005'B emergency diesel generator took greater than 17 s to start up 5 load onto bus. Caused bg failure of governor of engines. Mechanical section of governor replaced.

DISTRIBUTION CODE: IESSD COPIES RECEIVED: LTR J ENCL i SIZE:

TITLE: 50. 73 Licensee Event Report (LER)I Incident Rpt. etc.

NOTES:

REC IP IENT COPIES REC IP IENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD2-2 LA 1 1 PD2-2 PD 1 1 TOURIGNY, E 1 1 INTERNAL: ACRS MICHELSON 1 1 ACRS MOELLER 2 2 AEOD/DOA 1 1 AEOD/DSP/NAS 1 1 AEOD/DSP/ROAB 2 2 AEOD/DSP/TPAB 1 1 ARM/DCTS/D*B 1 DEDRO 1 1 NRR/DEST/ADS 0 NRR/DEST/CEB 1 1 NRR/DEST/ELB 1 1' NRR/DEST/ICSB 1 1 NRR/DEST/MEB 1 NRR/DEBT/MTB 1 1 NRR/DEST/PSB 1 1 NRR/DEST/RSB 1 NRR/DEST/SGB 1 1 NRR/DLPG/HFB 1 1 NRR/DLPG/G*B 1 1 -NRR/DOEA/E*B 1 NRR/DREP/RAB 1 1 NRR/DREP/RPB 2 2 NRR - - /SIB 1 1 NRR/PMAS/ILRB 1 1 E EZ 02 1 1 RES DEPY GI 1 1 RES TELFORDI J 1 1 RES/DE/EIB 1 1 RGN2 FILE 01 1 1 EXTERN*L: EGSG GROHi M 5 5 H ST LOBBY WA'RD 1 1 LPDR 1 1 NRC PDR 1 1 NSIC HARRISI J 1 1 NSIC MAYSi G 1 1 TOTAL NUMBER OF COPIES REQUIRED: LTTR 45 ENCL 44

P. QX 14000, JUNO BEACH, F L 33408 0420 HOVEViBER 0 9 1987 L-87-457 U. S. Nuclear'Regulatory Commission Attn: Document Control Desk Washington, D. C. 20SS5 Gentlemen:

Re: St. Lucie Unit 2 Docket No. 50-389 Date of Event: October 5, 1987 S ecial Re ort on Diesel Generator Fail'ure The attached Special Report is being transmitted pursuant to the requirements of Technical Specification 4.8.1.1.3 and 6.9.1 to provide notification of the 28 Emergency Diesel Generator failure.

Very truly yours,

~o C. O. Woo Group Vi resident Nuclear Energy COW/GRM/gp Attachment cc: Dr. J. Nelson Grace, Regional Administrator, Region ll, USNRC Senior Resident Inspector, USNRC, St. Lucie Plant 8~>>~aOgo 871 f0 DR ADt C6 S Cg 050003 PQR +i@

an FPL Group company GR M2/034/ I

SPECIAL REPORT 2B EDG FAILURE On October 5, 1987, Section 8.7, the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> EDG run of the Periodic Integrated Test of the Engineered Safety Features, OP 52-0400050, had just been completed. The 2A and the 2B EDG's were secured and Section 8.11, Loss of Offsite Power EDG's Hot, was commenced. At 0254, the start-up transformer breakers were opened to initiate a loss of offsite power as per the procedure. The 2A EDG started up and loaded as required

(<10 seconds), but the 2B EDG did not. The 2B EDG took greater than 17 seconds to start up and load onto its bus. Initially, the 2B EDG frequency and voltage appeared normal: however, as more loads came onto its bus, voltage fluctuated and frequency dropped. The test was secured when frequency went off scale low on the control room meter indication.

The cause of the 2B EDG failure was determined to be the governor of one of its engines. The mechanical section of the governor was replaced.

Troubleshooting also revealed that the governor air boost actuator had been hooked up improperly when it was last replaced. However, prior to this failure, the 2B EDG had not failed any subsequent surveillance tests. The air boost actuator was also replaced. The 2B EDG was retested satisfactorily.

This is the second failure in the last 100 valid starts of the Unit

$2 EDG's. The first one was the 2A EDG failure on September 2, 1987.

The surveillance frequency has been increased to once every two weeks.