ST-HL-AE-3814, Special Rept:On 910616,primary Meteorological Tower Wind Direction Sensor at 60 Meter Elevation Declared Inoperable Due to Indication Problems Resulting in Entry Into Tech Spec 3.3.3.4 Action Statement

Special Rept:On 910616,primary Meteorological Tower Wind Direction Sensor at 60 Meter Elevation Declared Inoperable Due to Indication Problems Resulting in Entry Into Tech Spec 3.3.3.4 Action Statement

ML20076B214
Person / Time
Site:	South Texas
Issue date:	07/03/1991
From:	Jump W HOUSTON LIGHTING & POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
ST-HL-AE-3814, NUDOCS 9107110113
Download: ML20076B214 (3)

Text

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The Light c o mp a ny South Tesas Project I.lectric Generating P. O. Station Ilus 289 Wadsworth. Tes ai 77483 llouston Lighting & I,ower__.

July 3, 1991 ST HL AE-3814 File No.: CO2 10CFR50.36 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 South Texas Project Electric Cenerating Station Units 1 and 2 Docket hos. STN 50 498 and 50-499 Special Report Regarding Inoperable Primary Meteorolocical Tower Instrument Pursuant to the South Texas Project Electric Generating Station Technical Specification 3.3.3.4, " Meteorological Instrumentation," Houston Lighting & Power (HL&P) submits the attached Special Report regarding an inoperable primary meteorological tower instrument.

If you should have any question: on this matter, please contact Mr. C. A. Ayala at (512) 972-8628 or myself at (512) 972-7205.

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William J. Jump Manager, Nuclear Licensing CAA/sgs Attachments: Special Report Regarding Inoperable Primary Meweorological Tower Instrument 9

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A Subsidiary of Ilouston Industries incorporated

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i-ST.HL AE 3814 I Ilou.ston Lighting h Power Company pile go, 00' South Texas Projut Electric Generating Station Page 2 i

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Regional Administrator, Region IV Rufus S. Scott. .

Nuclear Regulatory Cornission Associate General Counsel' 611 Ryan Plaza Drive, Suite 1000 Houston Lighting & Power Company Arlington, TX 76011 F. O. Box 61867 Houston, TX 77208 George Dick, Project ManaEer U.S. Nuclear Regulatory Conunission INPO Washington, DC 20555 Records Center 1100 circle 75 Parkway J. I. Tapia Atlanta, CA 30339 3064 Senior Resident Inspector c/o U. S. Nuclear Regulatory Dr. Joseph M. Hendric Commission 50 Be11 port Lane P. O. Box 910 Be11 port, NY 11713 Bay City, TX 77414 '

L D. K. Lacker J. R. Newmsn, Esquire Bureau of Padiation Control Newman & Holtzinger, P.C. Texas Department of Health 1615 L Street, N,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 J. C, Lanier/M. B, Lee City'of Austin Electric Utility Department P.0, Box 1088 Austin, TX 78767 R. J. Costello/M. T. Hardt City Public Service Eoard P. O. Box 1771 San Antonio, TX 78296 Revised 01/29/91 L4/NRC/

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Attachment ST HL AE.3814 Page 1 of 1 South Texas Project Electric Generating Station Units 1 and 2 Docket Nos. STN 50 498 and 50 499 Special Report Regarding_ Inoperable Primary Me,teorolocical Tower Instrument DESCRIPTION OF EVENT:

On June 16,1991 at 1450, the Primary Meteorological Tower wind direction sensor at the 60 meter elevation was declared inoperable due to an indication problem, resulting in entry into the Technical Specification 3.3.3.4 action statement. This action statement requires the-

,- instrumentation _be restored within seven days or a special report be submitted to the NRC. Preliminary investigation revealed that the output of the sensor

! did not correlate to the output of the processor. A new sensor was requisitioned from the warehouse and was installed on June 20th. However, it could not satisfy calibration tolerances. This depleted the onsite spare inventory for this component. Another sensor was requisitioned from the manufacturer and was installed. Investigation revealed a corroded termination board in the junction box on the tower adding to the inability of the sensor and processor to meet calibration tolerances. The corrosion was cleaned and the calibration was completed successfully on June 27th.

The South Texas Project Electric Generating Station has two meteorological towers. The Primary Tower consists of a 60 meter tower with instruments located at the 10 meter and 60 meter levels. The Backup Tower, located approximately one-half mile south of the _ Primary Tower, consists of a 10 meter tower with one set of instruments at the 10 meter level.

CORRECTIVE ACTION The priraary meteorological tower was restored to operable status on June 27, 1991.

- M DITIONAL INFORMATION The Primary Meteorological Tower 10 meter wind direction.and the Backup Meteorological Tower instruments were unaffected by this event and could have

! been used if required for performance of offsite dose calculations.

The 60-meter wind direction sensor behavior was originally identified as being anomalous on May 30th. However, the tower was not declared inoperable by Plant Operations until June 16th. This concern is being investigated. A l supplemental report describing results of this investigation will be provided l by July 31, 1991.

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SREP/91-179.001 l

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