ML20099K217

Special Rept:On 920714,seismic Monitoring Instruments Malfunctioned & Not Returned to Operable Status within 30 Days.Caused by Water Contaminating Containment Bldg Seismic Monitoring Device.Unit Shipped Back to Mfg

ML20099K217
Person / Time
Site:	Catawba
Issue date:	08/18/1992
From:	Tuckman M DUKE POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9208250247
Download: ML20099K217 (2)

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(; ou.u:1'owcn August 18,1992 U. S. Nuclear Regulatory Conunission A1TN: Document Control Desk Washington, DC 20555

Subject:

Catawba Nuclear Station Docket Nos. 50-413, 50-414 Special Report Seismic hionitoring Instrumentation Inopemble Pursuant to Technical Specifications 3.3.3.3 ACTION statement "a" and 6.9.2, find attached a Special Report conceniing the inoperability of one of the Seismic hionitoring Instntmerus. The instnnnent was declared inopemble on July 14, 1992 and remained inopenble for more than 30 days.

Very Intly yours, f-

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h1. S. Tuckman CRUSR81792.SE!

Attachment xc: S. D. Ebneter Regional Administrator, Region 11 R. E. h1artin, ONRR W. T. Orders Senior Resident inspector 9200250247 920818 PDR ADOCK 05000413 S PDR Zh N

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SPECIAL REPORT CATAWBA NUCLEAR STATION SEISh!IC h10NITORING INSTRUhfENT INOPERABLE On July 14, 1992, during a routine calibration, a malfunction of one of the Catawba Nuclear Station (CNS) Seismic hionitoring Instnunents was discovered. Failure to restore

fhe instrument to ocemble status within the required period of thiny (30) days resulted in implementing a Special Report pursuant CNS Technical Specification 3.3.3.3.

At approximately 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br /> on July 14, 1992, CNS Instrument and Electrical (IAE) hiaintenance Personnel dLovered water contaminating the containment building seismic monitoring device, Engdahl PSR1200 (lhilhfT5050). Although the specific source of the water could not be detennined, the water most likely came from a Decon washdown in containment. IAE hiaintenance removed the water and attempted the calibration, but were unable to complete the procedure becausc the water damage was too severe. The unit was shipped back to the manufacturer to be remanufacW. The unit has not yet been received back from the manufacturer. When the unit does arrive back on site, it will be installed, calibrated, and returned to operable status.

The Engdahl seismic instruments operate as independent devices; therefore, a failure of one

- instmment does not render the entire Engdahl system inoperable. The other seismic monitoring system, Kinemetrics, is fully operational.

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