ML17223A654

Special Rept:On 900405,loose Parts Detection Sys Channel out-of-svc for Greater than 30 Days.Cause of Failure Not Determined.Efforts Continuing to Identify Source of Electrical Noise & Mechanism for Induction Into Sys

ML17223A654
Person / Time
Site:	Saint Lucie
Issue date:	05/15/1990
From:	Sager D FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
L-90-183, NUDOCS 9005220161
Download: ML17223A654 (3)

Text

r" ACCELERATED DISIRIBUTION DEMON~TION SYSTEM I

REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9005220161 DOC.DATE: 90/05/15 NOTARIZED: NO DOCKET FACIL:50-389 St. Lucie Plant, Unit 2, Florida Power & Light Co. 05000389 AUTH. NAME AUTHOR AFFILIATION SAGER,D.A. Florida Power & Light Co.

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

SUBJECT:

Special rept:on 900405,loose par'ts detection sys channel out of svc greater than 30 days.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR TITLE: 50.73/50.9 Licensee Event Report (LER),

I ENCL SIZE:

IncidentJ Rpt, etc.

NOTES RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD2-2 LA 1 1 PD2-2 PD 1 1 NORRIS,J 1 1 INTERNAL: ACNW 2 2 ACRS 2 2 AEOD/DOA 1 1 AEOD/DS P/TPAB 1 1 AEOD/ROAB/DSP 2 2 DEDRO 1 1 NRR/DET/ECMB 9H 1 1 NRR/DET/EMEB9H3 1 1 NRR/DLPQ/LHFB11 1 1 NRR/DLPQ/LPEB10 1 1 NRR/DOEA/OEABll 1 1 NRR/DREP/PRPB11 2 2 NRR/DST/SELB 8D 1 1 NRR/DST/SICB 7E 1 1

~ST/& B8D1 1 1 NRR/DST/SRXB 8E 1 1 02 1 1 RES/DSIR/EIB 1 1 RGN2 FILE 01 1 1 EXTERNAL EG&G STUART P V A 4 4 L ST LOBBY WARD 1 1 LPDR 1 1 NRC PDR 1 1 NSIC MAYS,G 1 1 NSIC MURPHY,G.A 1 1 NUDOCS FULL TXT 1 1 NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE> CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED'TTR 36 ENCL 36

. ~

P.O. Box14000, Juno Beach, FL 33408.0420 MAY 1g ]99g L-90-183 10CFR50.36 May 15, 1990 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: April 5, 1990 Loose Parts Detection System Channel Out of Service The attached Special Report is being transmitted pursuant to the requirements of St. Lucie Unit 2 Technical Specification 3.3.3.8 and pursuant to Technical specification 6.9.2. The report provides notification that a Loose Parts Detection System channel was out of service for greater then thirty (30) days and the plans for restoring the channel to service.

Should there be any questions on this information, please contact us ~

Very truly yours, OA D. A S ger Vice P esident St. L cie Plant DAS:GRM:kw DAS/PSL N161 Attachment cc: Stewart D. Ebneter, Regional Administrator, Region II, USNRC Senior Resident Inspector, USNRC, St. Lucie Plant

>00>22016> 90051 S

R ADOCl 0~000~~9 PDC pe an FPL Group company

NRC SPECIAL REPORT ONE CHANNEL OF LOOSE PARTS MONITOR OUT OF SERVICE FOR A PERIOD GREATER THAN ALLOWED BY TECHNICAL SPECIFICATIONS At 03:15 on April 5, 1990 channel 8 of the St. Lucie Unit 2 loose parts monitor was declared out of service because the alarm level could not be set at the proper value due to increased electrical noise. As required by Technical Specification 3.3.3.8, this Special Report is being submitted to notify the NRC that the

-channel has been out of service greater than 30 days. The cause of this failure has not yet been determined because not all areas of the system are accessible during power operations. All accessible areas of the system have been investigated. Efforts are continuing to identify the source of the electrical noise, and the mechanism for induction into the Loose Parts Monitoring System.

At the next shutdown troubleshooting efforts will resume on the areas of the system not accessible while at power.

Channel 7 and 8 of the loose-part monitor are located on the 2B steam generator, thus channel 7 is still available for alarm functions on the 2B steam generator. Channel 8 is still available for analysis. since the electrical noise is not continuous. Only the alarm level for potential low level impacts is affected.