ML18010A367

Special Rept:On 910706,seismic Monitoring Sys Declared Inoperable.Caused by Unsatisfactory Surveillance Test Results.Maint Calibration Procedure & Operations Surveillance Test Performed Satisfactorily

ML18010A367
Person / Time
Site:	Harris
Issue date:	08/15/1991
From:	Richey R CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
HO-910111, NUDOCS 9108200158
Download: ML18010A367 (3)

Text

ACCELERATED DJQgUBUTION DEMONSTION SYSTEM REGULATORY INFORMATION DXSTRIBUTION SYSTEM (RIDS)

ACCESSION NBR: 9108200158 DOC. DATE: 91/08/15 NOTARIZED: NO DOCKET FACIL:50-400 Shearon Harris Nuclear Power Plant, Unit 1, Carolina 05000400 AUTH. NAME AUTHOR AFFILIATXON RICHEY,R.B. Carolina Power & Light Co.

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

SUBJECT:

Special rept:on 910706,seismic monitoring sys declared inoperable. Caused by unsatisfactory surveillance test results.Maint calibration procedure & operations surveillance test performed satisfactorily. D DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR TITLE: 50.73/50.9 Licensee Event Report (LER),

i ENCL 3 SIZE:

Incident Rpt, etc.

/

NOTES:Application for permit renewal filed. 05000400 A

RECIPXENT COPIES RECIPIENT COPIES D ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD2-1 LA 1 1 PD2-1 PD 1 1 D MOZAFARI,B. 1 1 INTERNAL: ACNW 2 2 ACRS 2 2 AEOD/DOA 1 1 AEOD/DSP/TPAB 1 1 AEOD/ROAB/DSP 2 2 NRR/DET/ECMB 9H 1 1 NRR/DET/EMEB 7E 1 1 NRR/DLPQ/LHFB10 1 1 NRR/DLPQ/LPEB10 1 1 NRR/DOEA/OEAB 1 1 NRR/DREP/PRPB11 2 2 NRR/DST/SELB 8D 1 1 NRR/DST/SICB8H3 1 1 NRR~DST/~B8D,1 1 1 NRR/DST/SRXB 8E 1 1 REG-Q- 1 1 RES/DSIR/EIB 1 1 RGN2 FILE 01 1 1 EXTERNAL: EG&G BRYCE,J.H 3 3 L ST LOBBY WARD 1 1 NRC PDR 1 1 NSIC MURPHY,G.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 P 1-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPXES REQUIRED: LTTR 33 ENCL 33

Carolina Power 8 Light Company P.O. Box 165 ~ New Hill, N.C. 27562 R. B. RICHEY Vice President Harris Nuclear Project AUG t 5 f99)

Letter Number: HO-910111 (0)

United States Nuclear Regulatory Commission ATTN: NRC Document Control Desk Washington, DC 20555 HARRIS NUCLEAR PROJECT UNIT 1 DOCKET NO. 50-400 LICENSE NO. NPF-63 NRC 10-DAY SPECIAL REPORT Gentlemen:

In accordance with Technical Specifications 3.3.3 ' and 6.9.2 for the Shearon Harris Nuclear Power Plant, Unit No. 1, Carolina Power

& Light Company hereby submits this Special Report. This Special Report concerns the operability of the Seismic Monitor.

Very truly yours R. B. Richey Vice President Harris Nuclear Project RBR:mbr Enclosure cc: Mr. S. D. Ebneter (NRC - RII)

Ms. B. L. Mozafari (NRC - RII)

Mr. J. E. Tedrow (NRC - SHNPP)

(% f%

'o108200158 91' 15 PDR ADOCK 05000400 P PDR MEM/H0-910111.0/1/Osl gZ

SEISMIC MONITOR SPECIAL REPORT BACKGROUND INFORMATION CAUSE:

On July 6, 1991, at 0100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> the Seismic Monitoring System was declared inoperable due to unsati,sfactory surveillance test results.

Operations Surveillance Test (OST-1042) is performed monthly to verify system operability by checking response to alarm and test signals. During the pre-test alignment for the test conducted on 7/6/91, it was noted that the event indicator on the Strong Motion Accelerograph (SMA-3) was not functioning properly. The test was deemed unsatisfactory and the monitor was declared inoperable.

Subsequent investigation performed by Technical Support and Maintenance personnel revealed that the indicator was operating properly and that the Seismic Trigger Test Switch must have been inadvertently depressed (bumped), causing the indicator to display white instead of black. After resetting the indicator to its correct position, OST-1042 was re-performed on 8/1/91. During this test, discrepancies were noted in the monitors playback strip recorder tape and the test was again deemed unsatisfactory. To provide accurate analysis of the strip chart tapes, copies were telecopied to the Seismic Monitoring System vendor, Kinemetrics Systems. Their conclusions were that the system was functioning properly and was capable of recording an event. The "play-back" function was the only part affected and this was due to the age of the cassette, the strength of the SMP-1 battery, the condition of the strip chart paper (Paper at end of the roll), personnel error (improperly loading of the cassette), or some combination of the above.

CORRECTIVE ACTIONS:

Maintenance Calibration Procedure (MST-I0240) and Operations Surveillance Test (OST-1042) were performed satisfactorily on 8/6/91 and the monitor was restored to operable status at 2205 hours0.0255 days <br />0.613 hours <br />0.00365 weeks <br />8.390025e-4 months <br />.

MEM/H0-910111.0/2/OS1