NOC-AE-000143, Special Rept:On 980413,declared Primary Meteorological Tower Instrumentation Inoperable Due to Performance of semi-annual Sys Calibr Required by TS 3.3.3.4.Successfully Calibr & Returned Primary Meterological Tower Instruments to Svc

Special Rept:On 980413,declared Primary Meteorological Tower Instrumentation Inoperable Due to Performance of semi-annual Sys Calibr Required by TS 3.3.3.4.Successfully Calibr & Returned Primary Meterological Tower Instruments to Svc

ML20217N975
Person / Time
Site:	South Texas
Issue date:	04/29/1998
From:	Parkey G HOUSTON LIGHTING & POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NOC-AE-000143, NOC-AE-143, NUDOCS 9805060014
Download: ML20217N975 (3)

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April 29, 1998 NOC-AE-000143 File No.: G02.06 10CFR50.36 STI: 30603428 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001 South Texas Project Units 1 and 2 Docket Nos. STN 50-i98, STN 50-499 Special Report Regarding Inonerable Primary Meteorolonical Tower Instruments Pursuant to the South Texas Project Nuclear Operating Company Technical Specification 3.3.3.4, " Meteorological Instrumentation," the South Texas Project submits the attached Special Report regarding inoperable primary meteorological tower instruments. There are no commitments associated with this Special Report.

If there are any questions, please contact Mr. A. W. Ilarrison at (512) 972-7298 or me at (512) 972-7800.

b G. L. Parkey Plant Manager, Unit I kaw

Attachment:

Special Report Regarding Inoperable Primary Meteorological Tower Instruments Y

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9805060014 980429 PDR S ADOCK 05000498 PDR 5Y/

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ST-NOC-AE-000143 File No.: G02.06  ;

Page 2 Ellis W. Merschoff Jon C. Wood llegional Administrator, Region IV Matthews & Branscomb U. S. Nuclear Regulatory Commission One Alamo Center l 511 Ryan Plaza Drive, Suite 400 106 S. St. Mary's Street, Suite 700 l

Arlington, TX 76011-8064 San Antonio,TX 78205-3692 '

Thomas W. Alexion Institute of Nuclear Power  !

Project Manager, Mail Code 13H3 Operations - Records Center U. S. Nuclear Regulatory Commission 700 Galleria Parkway Washington, DC 20555-0001 Atlanta, GA 30339-5957 1

David P. Loveless Richard A. Ratliff Sr. Resident Inspector Bureau of Radiation Control l c/o U. S. Nuclear Regulatory Commission Texas Department of Health j P. C Box 910 1100 West 49th Street 1 Bay City, TX 77404-0910 Austin, TX 78756-3189 l t

i J. R. Newman, Esquire D. G. Tees /R. L. Balcom Morgan, Lewis & Bockius Houston Lighting & Power Co.

1800 M. Street, N.W. P. O. Box 1700 l Washington, DC 20036-5869 Houston,TX 77251 M. T. Hardt/W. C. Gunst Central Power and Light Company City Public Service ATrN: G. E. Vaughn/C. A. Johnson P. O. Box 1771 P. O. Box 289, Mail Code: N5012 San Antonio,TX 78296 Wadsworth,TX 77483 A. Ramirez/C. M. Canady U.S. Nuclear Regulatory Commission City of Austin Attention: Document Control Desk Electric Utility Departmtat Washington, DC 20555-0001 721 Barton Springs Road Austin,TX 78704

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Attachment 1 NOC-AE-0143 Pageiofi Special Report Regarding Inoperable Primary Meteorological Tower Instruments DESCRIPTION OF EVENT:

On April 13,1998, at 0754 hours0.00873 days <br />0.209 hours <br />0.00125 weeks <br />2.86897e-4 months <br />, the Primary Meteorological Tower Instrumentation was declared inoperable for performance of the semiannual system calibration required by Technical Specification 3.3.3.4. Operability of the instrumentation was not achieved within the seven day restoration time limit of the Technical Specification, thus requiring the submittal of a Special Report.

The South Texas Project 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 Meteorological Tower, consists of a 10 meter tower with one set ofinstruments at the 10 meter level.

To perform the required calibration, the meteorological instruments on the Primary Meteorological Tower are calibrated to match the signal conditioning and recording equipment.

A substantial delay in the calibration process on the Primary Meteorological Tower was experienced due to a delta-temperature card failure and a defective self test circuit on the new delta-temperature card. This delay was compounded by intermittent failure of a test cable and inclement weathe:.

CORRECTIVE ACTION:

l The Primary Meteorological Tower instruments were successfully calibrated and returned to service on April 20,1998 at 1416 hours0.0164 days <br />0.393 hours <br />0.00234 weeks <br />5.38788e-4 months <br />.

l ADDITIONAL INFORMATION:

1 The Primary Meteorological Tower surveillance was completed at 0710 on April 20,1998, returning the Primary Meteorological Tower instruments to a functional status within the allotted time frame. Operability determination required verification that indications were consistent with expected conditions and that meteorological data quality was understood. Upon completion of the surveillance review and work package closure, the Primary Meteorological Tower was returned to operable status at 1416 on April 20,1998.

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