ML20056A955

Special Rept:On 900719,primary Meteorological Tower Instruments Declared Inoperable.Caused by Inconsistent Indication Resulting in Entry Into Tech Spec 3.3.3.4 Action Statement.Calibr Sensor Obtained & Installed

ML20056A955
Person / Time
Site:	South Texas
Issue date:	08/06/1990
From:	Kinsey W HOUSTON LIGHTING & POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
ST-HL-AE-3531, NUDOCS 9008100249
Download: ML20056A955 (3)

Text

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. The Light eompanyS uth T:xas Project Electric Generating Station P. O. Ilos 289 Wadsworth, Texas 77483 Houston Li htin & Power August 6,.1990 ST-HL-AE-3531 File No.: 002

, 10CFR50.36 U. S. Nuclear Regulatory Commission 4

Attentions. Document control Desk Washington, DC. 20555 South Texas Project Electric Generating Station Units 1 and 2 Docket Nos. STN 50-498 and 50-499.

• Special Report Regarding Inoperable Primary Meteoroloalcal Tower Instruments Pursuant to the South Texas Project Electric Generating ~ Station Technical Specifications 3.3.3.4, "Heteorological Instrumentation," Houston Lighting & Power (HL&P). submits tha attached Special Report regarding

,s inoperable primary meteorological tower instruments.

If you should have any questions on this matter, please contact Mr .1- S . M.-Head at (512) 972-7136 or myself at.(512) 972-7921. -j

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' Warren H.1Kinsey, Jr >:f .

Vice President V ]

Nuclear Generation -l i

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Attachment:

Special Report Regarding *ne tablo Primary Meteorological.Tue. .netruments a

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eq Al/SPR-PMT.S01 A Subsidiary of Houston Industries incorporated

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. Houston Lighting & Power Company

, South Texas Project Electric Generating Stati

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Regiona1' Administrator,. Region IV Rufus S. Scott Nuclear Regulatory Commission Associate General Counsel 611'Ryan Plaza Drive, Suite 1000 Houston Lighting & Power Company

! Arlington, TX_ 76011._ P. O. Box 61867 Houston, TX 77208 Coorge Dick, ' Project Manager EU.S.-Nuclear Regulatory Commission INPO Washington, DC 20555 Records Center 1100= circle'75 Parkway LJ. I. Tapia Atlanta, CA 30339-3064

' Senior Resident Inspector c/o U. S. Nuclear Regulatory. Dr Joseph M. Hendrie -

Commission 50 Be11 port Lane P. 0.sBox 910 Bellport, NY 11713

-Bay City, TX- 77414 D. K. Lacker-J. R. Ncnnnan, Esquire Bureau of Radiation Control Newman & Holtzinger, P.C. Texas Department of Health i 1615 L Street,'N.W.' 1100 West 49th Street I Washington,.DC. 20036 Austin, TX 78704 I D.' -

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d P. Verret.

Central Power & Light Company P. 0 3 Box l2121 Corpus Christi, TX 78403 J. C..Lanier h Director of Generation l

City of Austin Electric Utility _

721 Barton-Springs Road Austin,;TXL 78704 L s .

l R. J. Costello/M) T. Hardt City Public Service Board l

'P. O. Box 1771' .

' San' Antonio,'TX 78296 ;j{

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' 4 South Texas Project Electric Generating Station Units 1 and 2 Docket Nos.'STN 50-498 and-50-499 l Special Report Regarding Inoperable _j Primary Meteorolooical Tower Instruments  ;

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-DESCRIPTION OF EVENT:

On July 19, 1990, the Primary Peteorological Tower vind direction sensor at the 60 meter elevation was declared inoperable'due to inconsistent .t 9-indication, resulting in entry into Technical Specification 3.3.3.4 action .

statement. This action statement requires the instrumentation to be restored within seven days.or a special report be submitted to_the NRC. Although it' M could not-be confirmed,.the sensor most probably failed due to a lightning strike.- A calibrated sensor was obtained'and iner.alled and calibrated on July 26, 1990, however, the work could not be completed before the' action time limit had expired, thus requiring the submittal of 'this Special Report.

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 epproximately 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:

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The Primary Meteorological Tower wind direction sensor was restored to R ' operable status on July 26, 1990 after approximately 7 days and 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />.

ADDITIONAL INFORMATION:

L The-10 meter wind direction and the Backup Meteorological Tower

! instruments were operable throughout this event and-could have been used if

' required for performance of offsite dose ca.;ulations.

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Houston Lighting *& Power is reviewing the management controls which allowed this instrument to be inoperable for longer than the allowed outage time in the Technical Specifications. A supplemental report describing corrective actions taken as a result of this review will be provided by September 7, 1990.

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