U-603014, Special Rept:On 980512,lightning Struck Primary Meteorological Monitoring Instrumentation Tower Damaging 60- Meter Wind Speed & Associated Transmuter Circuit Card. Surveillance Testing Performed

Special Rept:On 980512,lightning Struck Primary Meteorological Monitoring Instrumentation Tower Damaging 60- Meter Wind Speed & Associated Transmuter Circuit Card. Surveillance Testing Performed

ML20248D862
Person / Time
Site:	Clinton
Issue date:	05/28/1998
From:	Sipek J ILLINOIS POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
U-603014, NUDOCS 9806030120
Download: ML20248D862 (2)

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I e lilinois Pow r Comp:ny Clinton Power Station ,

P.O. Box 678 Clinton. IL 61727 1 Tel 217 935-8881 Joseph V. Sipek P@ R o"ector - ce""a n sum. cnmy yggy 8E.100c May 28, 1998 Docket No. 50-461 Document Control Desk Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

Special Report: Failure to Return Clinton Power Station Meteorological Tower Instrumentation to Service Within Allowed Out-of-Service Time

Dear Madam or Sir:

Clinton Power Station (CPS) Operational Requirements Manual (ORM) Section 3.2.8, Action "a," requires that if one or more meteorological monitoring instrumentation channels are inoperable for more than 7 days, a SPECIAL REPORT to the Nuclear Regulatory Commission (NRC) must be prepared and submitted, pursuant to ORM Section 6.9.2, within the next 10 days outlining the cause of the malfunction and the plans for restoring the instrumentation to an OPERABLE status. Since May 12, 1998 at approximately 2214 hours0.0256 days <br />0.615 hours <br />0.00366 weeks <br />8.42427e-4 months <br />, the 10-meter and 60-meter wind speed monitors, 10-meter and 60-meter wind direction monitors, and the 10-meter to 60-meter differential air temperature instrumentation have been inoperable. Therefore, this /

SPECIAL REPORT is being submitted pursuant to the noted ORM requirements. C/

Cause of Malftmetion On May 12,1998, at approximately 2214 hours0.0256 days <br />0.615 hours <br />0.00366 weeks <br />8.42427e-4 months <br /> lightning struck the primary h g 7, meteorological monitoring instmmentation tower damaging the 60-meter wind speed and direction sensor and associated transmuter circuit card. On Mey 17,1998, the 60-meter wind speed and direction sensor and transmuter circuit card were successfully replaced. Surveillance testing was then performed to ensure that the instruments were operating properly. Several instruments were not performing as expected. Further troubleshooting identified that a section of the dewpoint sensor instmmentation cable, located between ajunction box on the meteorological monitcring tower and a terminal board in the adjacent meteorological equipment building, had a partial ground (38-41 ohms). The ground on this cable adversely affects the data output of the meteorological 9006030120 990528 PDR ADOCK 05000461' S PM ,

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. tower instrumentation including the 10-meter and 60-meter wind speed monitors, 10-meter and 60-meter wind direction monitors, and the 10-meter to 60-meter differential air temperature instrumentation. The degraded cable appears to have been caused by weathering.

Plans for Restoration CPS will replace the degraded instrumentation cable and perform surveillance testing to ensure that the 10-meter and 60-meter wind speed monitors,10-meter and 60-meter wind direction monitors, and the 10-meter to 60-meter differential air temperature instrumentation are operating satisfactorily. It is expected that this work w!!! be complete by June 12,1998.

Sincerely yours, O /3. d

• Joseph V. Sipek Director-Licensing JRF/mlh cc: Regional Administrator, Region III, USNRC NRC Clinton Licensing Project Manager NRC Resident Office, V-690 Illinois Department ofNuclear Safety I

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