ML17221A642

Special Rept:On 880112,emergency Diesel Generator 2A Failed to Start.Caused by Failed Speed Setting Bodine Motor on 12 Cylinder Engine Governor.Motor Replaced & Generator Returned to Svc

ML17221A642
Person / Time
Site:	Saint Lucie
Issue date:	02/19/1988
From:	Woody C FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
L-88-80, NUDOCS 8802260206
Download: ML17221A642 (4)

Text

F REGULAT'NFORMATION DISTR IBUTIO YSTEM (RIDS)

ACCESSION NBR: 8802260206 DOC. DATE: 88/02/19 NOTARIZED: NO DOCKET ¹ FACIL 50-389 St. Lucie Plant> Unit 2i Florida Poeer 5 Light Co. 05000389

'AUTH. NAME AUTHOR AFFILIATION WOODY'. O. Florida Power 5 Light Co.

RECIP. NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Special rept: on 880112'mergency diesel generator 2A failed to start. Caused by failed speed sett'ing,Bodine motor on 12 cylinder engine governor. Motor replaced 0 generator returned to svc.

DISTRIBUTION CODE: IE22D COPIES RECEIVED: LTR ENCL SIZE:

TITLE: 50. 73 Licensee Event Report (LER)i Incident Rpti etc.

NOTES:

RECIPIENT 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 TOURIGNYi 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/DAB 1 1 DEDRO 1 1 NRR/DEBT/ADS7E4 1 0 NRR/DEBT/CEB8H7 1 1 NRR/DEST/ESB 8D 1 1 NRR/DEST/ ICSB7A 1 NRR/DEST/MEBPH3 1 1 NRR/DEST/MTB 9H 1 1 NRR/DEST/PSBSD1 1 1 NRR/DEST/RSB 8E 1 NRR/DEBT/SQB 8D 1 1 NRR/DLPG/HFBiOD 1 1 NRR/DLPG/GAB10* 1 1 NRR/DOEA/EAB11E 1 1 NRR/DREP/RAB10A 1 1 NRR/DREP/RPB10A 2 2 1 1 NRR/PMAS/ ILRB 12 1 1 G FIL 02 1 1 RES TELFORD> J 1 1 RES/DE/EIB 1 RES/DRPS DIR 1 1 RGN2 FILE 01 1 EXTERNAL: EGSG GROHi M H ST LOBBY WARD 5,

1 5

1 FORD BLDG LPDR HOYLE A 1 1

1 1

NRC PDR 1 1 NSIC HARRISi J 1 1 NSIC MAYST G 1 TOTAL NUMBER OF COPIES REQUIRED: LTTR 46 ENCL 45

P. Y 14000, JUNO BEACH, FL 33408 0420 FEBRUARY, 1 9 1988 L-88-80 Tech Spec U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555 Gentlemen:

Re: St. Lucie Unit 2 Docket No. 50-389 Date of Event: January 12, 1988 S ecial Re ort on Diesel Generator Failure 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 2A Emergency Diesel Generator failure; Very truly yours, CMd

~g C. O. Woody Executive Vice President COW/GRM/dh Attachment cc: Dr. J. Nelson Grace, Regional Administrator, Region USNRC II, Senior Resident Inspector, USNRC, St. Lucie Plant GRM.003.DGF 8802260206 8802i9 PDR ADQCK 05000389 8 PDR an FPL Group company

SPECIAL REPORT DIESEL GENERATOR FAILURE At 1326 hours0.0153 days <br />0.368 hours <br />0.00219 weeks <br />5.04543e-4 months <br /> on January 12, 1988, St. Lucie Unit 2 2A Emergency Diesel Generator (EDG) was started for a surveillance run. The EDG unit consists of two diesel engines, a 16 and 12 cylinder, driving one generator coupled in tandem. An alarm was received, "EDG 2A ONE ENGINE START FAILURE", indicating one of the engines had failed to start.

The input signal to this alarm is a high temperature differential between the 16 and 12 cylinder engines exhaust temperatures. The hottest exhaust temperature indicates the engine which is picking up more load than the other.

After the start of the 2A EDG, a plant operator noticed that the exhaust temperature differential between the two engines exhaust was approximately 300 degree F. The 12 cylinder engine exhaust temperature was the lowest (<100F) indicating it failed to start. The operator then locally tripped the 2A EDG knowing that rated load could not be carried by the one 16 cylinder engine.

However, the control room operators had timed the start of the 2A EDG to be less than the required Technical Specification of 10 seconds. To allow operations personnel to assess and evaluate the performance of the 2A EDG, was removed from service and restarted for test with it maintenance personnel on hand locally.

Again after the start, the "EDG 2A ONE ENGINE START FAILURE" alarm was received and high exhaust temperature differential was observed. This condition continued during the loading and the unit failed to accept rated load. The 2A EDG was stopped and an investigation into the failure was performed.

The investigation revealed that the 12 cylinder engine's fuel racks would open at the start but then close causing the high exhaust temperature differential and the fail to start alarm. A failed speed setting Bodine motor on the 12 cylinder engine governor was the cause for the fuel racks not to open.

GRM. 003. DGF

The Bodine motor was replaced and a failure analysis will be performed on it, the root cause of the by an independent vendor, to identify failure.

The 2A EDG was started for operability and the surveillance was completed satisfactorily. The 2A EDG was then returned to service at 1956 hours0.0226 days <br />0.543 hours <br />0.00323 weeks <br />7.44258e-4 months <br /> on January 12, 1988.

This is the third failure of a St. Lucie Unit 2 EDG within the last 100 valid starts. The surveillance frequency was changed to once every seven days, which is in conformancce with Technical Specifications and Regulatory Guide 1.108 c.2.d. Revision l, August 1977. The last EDG failure was on October 15, l987.

GRM.003.DGF