ML20029C619

Special Rept:On 940328,meteorological Tower Instrumentation Not Returned to Svc within Allowed Out of Svc Time.Caused by Difficulty in Calibr of Input Card.Meteorological Monitoring Instrumentation Declared Operable on 940408

ML20029C619
Person / Time
Site:	Clinton
Issue date:	04/14/1994
From:	Phares R ILLINOIS POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
U-602274, NUDOCS 9404190212
Download: ML20029C619 (2)

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• w. :. Pmer commersy Ch ' :q Power Suhon P o bit 078 C# nU01G7 I tw m ms un lb"h U-602274 b L47 94( 04- 14 )LP 8E.100c April 14, 1994-Docket No. 50-461 10CFR50.36 Document Contrd De s Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

Special Report: Failure to Return Clinton Power Station Meteorological Tower Instrumentation to Service Wi@irLAllowed Out oLSmicelimg

Dear Sir:

Clinton Power Station (CPS) Technical Specification 3.3.7.3, Action "a," requires inoperabilities of meteorological monitoring instnimentation channels for more than 7 days be reported to the Nuclear Reg *g,#, 'cubussion (NRC) within the next 10 days pursuant to Specification 6.9.2, SPliCIAL REPORTS. The meteorological monitoring instrumentation was declared inoperable for loop calibration from 0921 on March 28, 1994 until 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br /> on April 8,1994. This Special Report is therefore being submitted in accordance with the CPS Technical Specifications to provide information regarding the extended inoperability of the meteorological monitoring instrumentation.

On March 28,1994, Control and Instrumentation (C&l) personnel began performance of the meteorology system loop calibration in accordance with CPS procedure 9437.14. This procedure provides instructions for the performance ofloop calibrations on the meteorological monitoring instrumentation as required by CPS Technical Specification 4.3 7 3. Performance of this procedure results in the inoperability of the instrumentation being calibrated. Due to the circumstances described below, C&l personnel were not able to complete the calibrations and return the instrumentation to service within 7 days in addition to the semiannualloop calibration begun on March 28, C&l personnel were also working maintenance work request (MWR) D55716 to investigate problems with the 60 meter wind sensor. When dimculty was encountered with the calibration of one of the input cards delays in the completion of the calibration were experienced.

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'e.. - t Page 2 C&I personnel worked expeditiously to return the meteorological tower instrumentation to service. Ilowever, because of concerns for worker safety, work was not (and typically is not) performed on the tower at night or when winds were high.

Following the completion of the channel calibrations and the MWR work, and allowing for a subsequent period of time to observe the instrumentation response to meteorological  ;

conditions, the meteorological monitoring instrumentation was declared OPERABLE at 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br /> on April 8,1994.

Submittal of this letter satisfies the requirements of CPS Technical Specifications 3.3.7.3, Action "a" and 6.9.2 for submitting a Special Report for meteorological tower inoperabilities.

Sincerely yours,

_c - A'k >

Richard F. Phares i Director, Licensing TAB /csm cc: NRC Clinton Licensing Project Manager NRC Resident Office, V-690 Regional Administrator, Region III, USNRC lilinois Department of Nuclear Safety i

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