ML17300A776

Special Rept 1-SR-87-015:on 870408,30-day Action Statement for Operability of Seismic Monitoring Sys Exceeded.Caused by Ribbon Cable Wire Separating from Connector.Cable Repaired

ML17300A776
Person / Time
Site:	Palo Verde
Issue date:	04/17/1987
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
1-SR-87-015, 1-SR-87-15, 192-00193-JGH-T, 192-193-JGH-T, NUDOCS 8704270475
Download: ML17300A776 (6)

Text

REQULATQR NFORMATIQN DISTRIBUTION S EM (R IDS) r a ACCESSION NBR: 8704270475 DOC. DAT&.: 87/04/ 1 7 NOTARIZED: NO'OCKET FACIL: STN-50-528 Palo Verde Nuclear Station> Unit 1> Arizona Pub AUTH. NAME AUTHOR AFFILIATION li 05000528 HAYNES> J. Q. Arizona Nuclear Pover Prospect (formerly Arizona Public Serv RECIP. NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Dest )

SUB JECT: Special Rept 1-SR-87-015: on 870408> 30-day action statement for operability of seismic monitoring sos exceeded. Caused bg ribbon cable !I!ire separating from connector. Cable repaired.

DISTRIBUTION CODE: IE22D COPIES RECEIVED: LTR /ENCL TITLE: 50. 73 Licensee Event Report (LEP,) Incident Rpt> etc.

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/ SIZE:

NOTES: Standardized plant. M. Davis> NRR: 1Cg. 05000528 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA PD5 PD 1 1 LICITRA> E 1 DAVIS> M 1 1 INTERNAL: ACRS MICHELSON 1 ACRS MOELLER 1 1 AEOD/DOA f 1 AEOD/DSP/ROAB 2 2 AEOD/DSP/TPAB 1 1 l'!RR/ADT 1 NRR/DEST/ADE 1 0 NRR/DEST/ADS 0 NRR/DEST/CEB 1 f NRR/DEST/ELB 1 1 NRR/DEST/ ICSB 1 1 NRR/DEST/MEB 1 NRR/DEBT/MTB 1 NRR/DEST/PSB 1 1 NRR/DEBT/RSB f NRR/DEST/SQB 1 1.

NRR/DLPG/HFB 1 NRR/DLPG/GAB 1 1 NRR/DOEA/EAB 1 1 NRR/DREP/EPB 1 NRR/DREP/RAB. 1 NRR/DREP/RPB 2 2 R ILRB 1 1 NRR/PMAS/PTSB 1 Q FIL 02 1 RES SPEIS> T 1 1 RQN5 FILE 01 1 EXTERNAL: EQSQ QRQH> M 5 5 H ST LOBB Y NARD 1 1 LPDR 1 '1 NRC PDR 1 1 NSIC HARRIS> J 1 1 NSIC MAYS> Q 1 NOTES: 1 1 TOTAL NUMBER OF COPIES REQUIRED: LT'lR 44 ENCL 42

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Arizona Nuclear Power Project P.O. BOX 52034 ~ PHOENIX, ARIZONA 85072-2034 192-00193-JGH/TRB/MJC April 17, 1987 NRC Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

Palo Verde Nuclear Generating Station Unit 1 Docket No. STN 50-528 (License NPF-41)

Special Report 1-SR-87-015 File: 87-020-404

Dear Sirs:

Attached please find a Special Report 1-SR-87-015 prepared and submitted pursuant to Technical Specifications 3.3.3.3 and 6.9.2. This report discusses an event in which the Seismic Monitoring System was inoperable for greater than 30 days.

lf you have any questions, please contact Tom Bradish, Compliance Supervisor at (602) 932-5300, Ext. 6936.

Very truly yours, J. G. Haynes Vice President Nuclear Production JGH/TRB/MJC/cld Attachment cc: 0. M. DeMichele (all w/a)

E. E. Van Brunt, Jr.

J. B. Martin R. P. Zimmerman R. C. Sorenson E. A. Licitra A. C. Gehr INFO Records Center 8704270475 870417 PDR 8

ADOCK 05000528 PDR r>>

PALO VERDE NUCLEAR GENERATING STATION UNIT 1 Inoperable Seismic Monitoring Instrumentation License No. NPF-41 Docket No. STN 50-528 Special Report 1-SR-87-015 This Special Report is being submitted pursuant to Technical Specification (T.S.)

3.3.3.3 ACTION Statement a and T.S. 6.9.2.

At approximately 0215 MST on April 8, 1987, Palo Verde Unit 1 was in Mode 1 (POWER OPERATION) at 100 percent power when the 30 day ACTION Statement for operability of the seismic monitoring system was exceeded. The seismic monitoring system had been declared inoperable at approximately 0215 MST on March 9, 1987 due to the malfunction of the Channel 3 data recorder. The data 'recorder malfunction occurred during the performance of 41ST-1SM01 (Seismic Instrumentation Channel Checks 4.3.3.3.1).

Troubleshooting conducted under an authorized work document identified a defective logic card and a circuit breaker that was open or not making proper contact. The circuit breaker is located upstream of a negative 12 volt power. supply. The logic card was replaced and the circuit breaker was reset. A root cause of failure analysis has been initiated to determine the cause of the logic card malfunction.

On April 7, 1987, the performance of 36ST-1SM01 (Seismic Monitoring System Functional Test Procedure) and the appropriate portions of 36ST-1SM02 (Seismic Monitoring System Calibration Test) were initiated to return the seismic monitoring system =to operable status . However, during the performance of the surveillance tests, vertical indication could not be obtained from the Channel 2 data recorder. The vertical indication is a representation of the vertical motion that would be experienced during an earthquake.

Troubleshooting determined that a ribbon cable wire had separated from a connector.

The ribbon cable connects the Channel 2 data recorder with surveillance test equipment.

This ribbon cable is permanently installed. The cable was repaired and the performance of 36ST-1SM01 and 36ST-1SM02 was resumed. Following the successful completion of 36ST-1SMOl, 36ST-lSM02, and 41ST-1SM01 the Seismic Monitoring System was declared operable at 1545 MST on April 9, 1987.