ML17304A411

Special Rept 1-SR-88-006:on 880817,30-day Action Statement for Operability of Seismic Monitoring Sys Exceeded.Caused by Seimic Accelerometer Trigger Card (Setpoint) Out of Calibr. Card Recalibr.Sys Returned to Operable Status on 880818

ML17304A411
Person / Time
Site:	Palo Verde
Issue date:	08/24/1988
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
1-SR-88-006, 1-SR-88-6, 192-00406-JGH-T, 192-406-JGH-T, NUDOCS 8809060002
Download: ML17304A411 (6)

Text

AC CE&RATQ4UL A5w v3%885RM(Rz@'~~M ACCESSION NBR:8809060002 DOC.DATE: 88/08/24 NOTARIZED: NO DOCKET FACIL:STN-50-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi 05000528 AUTH. NAME AUTHOR AFFILIATION HAYNESgJ.G. Arizona Nuclear Power Project (formerly Arizona Public Serv RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Special Rept 1-SR-88-006 re seismic monitoring sys inoperability for more than 30 days.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR ~ ENCL / SIZE:

TITLE: 50.73 Licensee Event Report (LER), Incident Rpt, etc.

NOTES:Standardized plant. 05000528 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA 1 1 PDS PD 1 1 LICITRAiE 1 1 DAVISgM 1 1 INTERNAL: ACRS MICHELSON 1 1 ACRS MOELLER 2 2 ACRS WYLIE 1 1 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/DEST/ADS 7E 1 0 NRR/DEST/CEB 8H 1 1 NRR/DEST/ESB 8D 1 1 NRR/DEST/ICSB 7 1 1 NRR/DEST/MEB 9H 1 1 NRR/DEST/MTB 9H 1 1 NRR/DEST/PSB 8D 1 1 NRR/DEST/RSB 8E 1 '

1 NRR/DEST/SGB 8D 1 1 NRR/DLPQ/HFB 10 1 NRR/DLPQ/QAB 10 1 1 NRR/DOEA/EAB 11 1 1 NRR/DREP/RAB 10 1 1 NRR/DREP/RPB 10 2 2 NR D S SIB 9A 1 1 NUDOCS-ABSTRACT 1 1 EG FI 02 1 1 RES TELFORDgJ 1 1 RES/DSIR DEPY 1 1 RES/DSIR/EIB 1 1 RGN5 FILE 01 1 1 EXTERNAL: EG6G WILLIAMS,S 4 4 FORD BLDG HOY,A 1 1 H ST LOBBY WARD 1 1 LPDR 1 1 NRC PDR 1 1 NSIC HARRIS,J 1 1 NSIC MAYS,G 1 1 NOTES: 1 1

+~G)J6 ~

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TOTAL NUMBER OF COPIES REQUIRED: LTTR 48 ENCL 47

1 Arizona Nuclear Power Project P.O. BOX 52034 ~ PHOENIX, ARIZONA85072-2034 192-00406-JGH/TDS/JEM August 24, 1988 U. S. Nuclear Regulatory Commission NRC Document Control Desk Washington, D.C. 20555

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Unit 1 Docket No. STN 50-528 (License No. NPF-41)

Special Report 1-SR-88-006 File: 88-020-404 Attached please find Special Report 1-SR-88-006 prepared and submitted pursuant to Technical Specifications 3.3.3.3. This report discusses the Seismic Monitoring System being inoperable for greater than 30 days.

If you have any questions, please contact T. D. Shriver, Compliance Hanager at (602) 393-2521.

Very truly yours, y'0 J. G. Ha nes Vice President Nuclear Production JGH/TDS/JEH/kj Attachment cc: D. B. Karner (all w/a)

E. E. Van Brunt, Jr.

J. B. Hartin T. J. Polich M. J. Davis A. C. Gehr INPO Records Center 8809060002 880824 PDR ADOCK 05000528 8 PNU

~$ 1 t

PALO VERDE NUCLEAR GENERATING STATION UNIT 1 Inoperable Seismic Monitoring Instrumentation License No. NPF-41 Docket No. STN 50-528 Special Report 1-SR-88-006 This Special Report is being submitted pursuant to Technical Specification 3.3.3.3 ACTION "a" and Technical Specification 6.9.2.

At approximately 0857 MST on August 17, 1988, Palo Verde Unit 1 was in Mode 3 (HOT STANDBY) with Reactor Coolant System (RCS) cold leg temperature at approximately 565 degrees F and RCS pressure at 2250 psia when the 30 day ACTION Statement for operability of the Seismic Monitoring System was exceeded. The Seismic Monitoring System had been declared inoperable at 0857 HST on July 18, 1988 due to spurious alarms.

Troubleshooting in accordance with an authorized work document identified the cause of the spurious alarms to be the trigger card (setpoint) for seismic accelerometer JSHNXT-0001 (Tendon Galley Floor, 55 foot level). The trigger card was found to be out of calibration and was subsequently recalibrated.

t Upon satisfactory performance of 36ST-1SM02 (Seismic Honitoring System Calibration Test) the Seismic Monitoring System was returned to operable status at 0537 HST on August 18, 1988. The Seismic Monitoring System was inoperable for approximately 31 days.