ML17228A133

Special Rept:On 930310,longitudinal Channel of Common Seismic Monitor Recorder & Indicator Declared Out of Svc & Remained Out of Svc Longer than Allowed by Ts.Util Awaiting Repairs to Instruments by Vendor

ML17228A133
Person / Time
Site:	Saint Lucie
Issue date:	04/19/1993
From:	Sager D FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
L-93-102, NUDOCS 9304270028
Download: ML17228A133 (3)

Text

Accm~g@ PP~@g~@Xy&XWKÃs' ACCESSION NBR:9304270028 DOC.DATE: 93/04/19 NOTARIZED: NO DOCKET I FACIL:50-335 St. Lucie Plant, Unit 1, Florida Power & Light Co. 05000335 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 930310,longitudinal channel of common .,

seismic monitor recorder & indicator declared out of svc &

'D remained out of svc longer than allowed by TS.Util to instruments by vendor.

awaiting'epairs DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR

-TITLE: 50,73/50.9 Licensee Event- Report (LER),

LIncident ENCL I SIZE:

Rpt, etc.

+

NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL D

PD2-2 LA 1 1 PD2-2 PD 1 1 NORRISPJ 1 1 D

INTERNAL: ACNW 2 2 ACRS 2 2 AEOD/DOA 1 1 AEOD/DSP/TPAB 1 1 AEOD/ROAB/DSP 2 2 NRR/DE/EELB 1 1 NRR/DE/EMEB 1 1 NRR/DORS/OEAB 1 1 NRR/DRCH/HHFB 1 1 NRR/DRCH/HICB 1 1 NRR/DRCH/HOLB 1 1 NRR/DRIL/RPEB 1 1 NRR/DRSS/PRPB 2 2 NRR/3)5SA/SPLB 1 1 NRR/DSSA/SRXB 1 . 1 EG PQL5 02 1 1 RES/DSIR/EIB 1 1 GN2 FILE 01 1 1 EXTERNAL EG&G BRYCE g J H 2 2 L ST LOBBY WARD 1 1 NRC PDR 1 1 NSIC MURPHYPG.A 1 .1 NSIC POORE,W. 1 1 NUDOCS FULL TXT 1 1 D ,

D NOTE TO ALL"RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 504-2065) TO ELIMINATEYOUR NAME FROM DISTRII3UTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED: LTTR 32 ENCL 32

P.O. Box, Ft. Pierce, Fi 34954-0128 April 19, 1993.

FPL L-93-102 10 CFR 50.36 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555 Re: St. Lucie Units 1 and 2 Docket Nos. 50-335 and 50-389 Special Report Date of Event: March 10, 1993 Seismic Monitorin Channel Out of Service The attached Special Report is being submitted pursuant to the requirements of St. Lucie Technical Specification 3.3.3.3. This report provides notification that a Seismic Monitoring Channel has been out of service for greater than thirty days and describes the cause of the malfunction and the plans for restoring the channel to service.

Very truly yours, D. A. S er Vice P sident St. Lu e Plant DAS/JWH/kw Attachment cc: Stewart D. Ebneter, Regional Administrator, USNRC Region II Senior Resident Inspector, USNRC, St. Lucie Plant DAS/PSL N900-93

~ gr ~

'rr304270028 930~~9 ~' G ~

PDR ADOCK 05000335 S PDR an Fpi. Group cornpanV

NRC SPECIAL REPORT SEISMIC, MONITOR OUT OF SERVICE FOR LONGER THAN ALLOWED BY TECHNICAL SPECIFICATIONS On March 10, 1993 the longitudinal channel of the St. Lucie Plant common seismic monitor recorder (SMR-42-1) and 'seismic monitor indicator (SMI-42-11) were declared out of service. As required by Technical Specification 3.3.3.3, this Special

'Report is being submitted to notify the NRC that these instruments have been out of service greater than 30 days.

There'are 2 seismic monitor recorders (SMRs) located in Unit 1 containment area which are tied to a master SMR-42-1 that also functions as an'additional containment seismic recorder. The master SMR-42-1 provides a output signal on the different

'motion ranges (transverse, longitudinal, and vertical) from these three triaxial accelerators to the seismic monitoring indicator (SMI) SMI-42-11 located in the Unit 1 control room. The SMI serves to provide peak acceleration data to control room operators so,that they may determine'if a Operational Basis Earthquake (OBE) has occurred. On a monthly channel check, the SMI is tested by inserting a test signal to each of the motion channels on the master controller to excite the respective recorder.

During a surveillance of the SMI the test signal was inserted but the indicator for the longitudinal channel showed no deflection.

Troubleshooting of the system indicated that the problem was in the, master controller SMR-42-1. On March 18, SMR-42-1 was sent to the vendor (Kinemetrics) for repair.

This model of seismic monitor is no longer manufactured so repairs were expedited on the existing SMR-42-1. The unit arrived back at St. Lucie on April 7. Instrument and Controls (l&C) department made a containment entry and installed SMI-42-1 on the same day. When the unit was tested to verify operability it was discovered that the same symptoms of the problem were still present. The l8C department tried to determine the cause and make repairs to the instrument at St. Lucie Plant. However, on April 10, the SMR-42-1 was returned to the vendor for further repair. Currently St.

Lucie Plant is awaiting repair of the instrument by Kinemetrics to determine the exact root cause and to place the unit back in service.

The triaxial accelerator SMR-42-1, and control room indicator SMI-42-11, are expected to be placed back in service by May 10, 1993. In the interim, sufficient capability is still available to promptly determine the magnitude of a seismic event and evaluate the response of those features important to safety. The plant seismic switch SMS-42-12, and peak shock recorders SMR-42-9 and SMR-.42-10, are independent from the affected equipment described in this special report. SMS-42-12 will continue to provide annunciation in both control rooms if a seismic event equal to or greater than 90% of the OBE occurs. After an OBE alarm, plant personnel will have the ability to review peak shock recorder readings on SMR-42-9 and SMR-42-10. Additionally, seismic recorders SMR-42-2.through SMR-42-5 will record information from a OBE or Design Basis Event on magnetic tape for later review and analysis.