ST-HL-AE-4299, Special Rept:On 921128,Seismic Monitoring Sys Declared Inoperable & Placed in Out of Svc Log When Listed Hardware Problems Identified.Caused by Failure to Properly Manage TS Required Equipment Priorities.Sys Returned to Operability

Special Rept:On 921128,Seismic Monitoring Sys Declared Inoperable & Placed in Out of Svc Log When Listed Hardware Problems Identified.Caused by Failure to Properly Manage TS Required Equipment Priorities.Sys Returned to Operability

ML20127B769
Person / Time
Site:	South Texas
Issue date:	01/07/1993
From:	Kinsey W HOUSTON LIGHTING & POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
ST-HL-AE-4299, NUDOCS 9301130114
Download: ML20127B769 (4)

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The Light cllouston o mp 1.ighting & Power any ""dd"*'""d"t untik Genciadng stanon_ 1l7 a nosy 83, yadsworth Tnai 77 January 07. 1993 ST-HL-AE-4299 File No.: G'12 10CFR50.36 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 South Texas Project Unit 1 Docket No. STN 50-498 Special Report Regarding the Seismic Monitorina System Being Inoperable for Greater than 30 Days Pursuant to the South Texas Project Electric Generating Station (STPEGS) Technical Specifications, Houston Lighting & Power

(!!L&P) submits the attached Special Report regarding the Seismic Monitoring system being inoperable for greater than 30 days. This event did not have an adverse effect on the health and safety of the public.

If you should have any questions on this matter, please contact Mr. C. A. Ayala at (512) 972-8628 or me at (512) 972-7921.

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W. H. Ki e , Jr.

Vice Presi ent, Nuclear Generation JMP/ag

Attachment:

Special Report Regarding the Seismic Monitoring System Being Inoperable for Greater than 30 Days

(* b N 83-00' 001 A sub3idiary of Ilouston Industries Incorporated

/gf N i 1 9301130114 930107 PDR ADOCK 05000498 S PDR

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"lfoustin 1 ighting & Power Company ST-HL-AE-4299 South Texas Project Electric Generating Stat.ion File No.: G02 Page 2 ,

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Regional Administrator, Region IV Rufus S. Scott Nuclear Regulatory Commission Associate General Counsel 611 Ryan Plaza Drive, Suite 400 Houston Lighting & Power Company Arlington, TX 76011 P. O. Box 61867 Houston, TX 77208 George Dick, Project Manager U.S. Nuclear Regulatory Commission INPO Washington, DC 20555 Records Center 1100 Circle 75 Parkway J. I. Tapia Atlanta, GA 30339-3064 Senior Resident Inspector c/o U. S. Nuclear Regulatory Dr. Joseph M. Hendrie Commission 50 Bellport Lane P. O. Box 910 Bellport, NY 11713 Bay City, TX 77414 D. K. Lacker J. R. Newman, Esquire Bureau of Radiation. Control Newman & Holtzinger, P.C., STE 1000 Texas Department of Health 1615 L Street, d.W. 1100 West 49th Street Washington, DC 20036 Austin, TX 78756-3189 D. E. Ward /T. M. Puckett Central Power and Light Company P. O. Box 2121 Corpus Christi, TX 78403 l

J. C. Lanier/M. B. Lee City of Austin Electric Utility Department P.O. Box 1088 Austin, TX 78767 K. J. Fiedler/M. T. Hardt City Public Service Board P. O. Box 1771 San Antonio, TX 78296 Revised 10/11/91 L4/NRC/

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• Attachment ST-HL-AE-4299 Page 1 of 2 South Texas Project Unit 1 Docket No. STN 50-498 Special Report Regarding the Seismic Monitorinci Syst;em Being Inopfrable for Greater than 30 Days DESCRTETIj2N OF EVE 11T Technical Specification 3.3.3.3 requires that with one or more of the Seismic Monitoring System instruments inoperable for more than _

30 days, a special report be written within the next 10 days outlining the cause of the malfunction and the plans for restoring the instrument (s) to operable status. This report fulfills that requirement.

On November 28, 1992, at 0628 hours0.00727 days <br />0.174 hours <br />0.00104 weeks <br />2.38954e-4 months <br /> while Unit 1 was in a refueling outage, surveillance testing was started on the Seismic Monitoring System. The Seismic Monitoring System was declared inoperable and placed in the out of service log. The surveillance test requires several days to perform.

During the performance of this surveillance test the following hardware problems were identified:

• While performing the calibration of the triaxial accelerometer, the backup batteries were discharged. The batteries were recharged and replaced as necessary.

• The Digital Cassette Accelerograph (DCA) analog trigger card was found to be out of tolerance and would not adjust. The trigger card was replaced.

• A problem with the seismic trigger and the master relay was encountered which was determined to be a faulty thumbwheel and toggle switch board. These were subsequently replaced.

. A broken wire was found on the regulator board of the master DCA, resulting in a failure of the cassette tape deck. The wire was repaired and the trigger card was found to be within tolerance limits.

• The playback response test was not working due to the failure of two master logic cards were replaced.

• A cassette deck was replaced on the DCA master due to intermittent operation.

SRIN 93-004.061

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Attachment ST-ilL-AE-4 2 99 l Page 2 of 2 On December 3 0, - 1992, the surveillance test Wan completed satisfactorily and the Seismic Monitoring System was declared operable on January 2, 1993, at 0105 hours0.00122 days <br />0.0292 hours <br />1.736111e-4 weeks <br />3.99525e-5 months <br />.

.CAUSE OF MMZUECTION The Seismic Monitoring System was inoperabic for greater than 30 days as a result of failure to properly manage Technical Specification required equipment priorities. An evaluation is being performed to determine the cause for the failure to properly manage the initial problem and why there were numerous equipment problems. ,

PLANS FOR RESTORATJON TO OEEBAll_Ud31 The Seismic Monitoring System was returned to an operable status on January 2, 1993 at 0105 hours0.00122 days <br />0.0292 hours <br />1.736111e-4 weeks <br />3.99525e-5 months <br />. No further restoration actions are required.

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