ML20235T339
| ML20235T339 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 07/10/1987 |
| From: | Tucker H DUKE POWER CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8707220108 | |
| Download: ML20235T339 (2) | |
Text
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Dune POWER GOMPANY -
P.O. Box 33189 1
cuantorre, N.o. 28242 l
HAL B. TUCKEH '
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.(704) 373-4631'
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.-. July 10,.1987.
i U..S. Nuclear Regulatory Commission.
Attention:- Document, Control Desk
' Washington,.D. C. 20555
Subject:
' Catawba Nuclear Station, Units.1 and 2 Docket Nos. 50-413 and 50-414 Gentlemeni l
Pursuant to Technical Specification 3.3.3.4, please find attached a Special Report concerning the Meteorological Monitoring Instrumentation System.
IVery truly yours,
. Hal. B... Tucker
'JGT/70/sbn Attachment Dr. J., Nelson Grace, Regional' Administrator.
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U. S.; Nuclear Regulatory Comraission Region II 101 Marietta. Street, NW,' Suite 29002 i
Atlanta, Georgia 30323 Mr. P. K. Van Doorn NRC Resident Inspector Catawba Nuclear Station
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PDR ADDCK 05000413
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SPECIAL REPORT INOPERABILITY OF METEOROLOGICAL MONITORING INSTRUMENTATION SYSTEM On June 24, 1987 a work request was entered in the Technical Specification Action Item Log indicating problems with the Catawba Nuclear Station (CNS) Meteorological Monitoring System. The system was unable to be restored to an operable status within the time frame required by CNS Technical Specification 3.3.3.4.
In accordance with Action (a) of Technical Specification 3.3.3.4, this report outlines the cause of malfunction and plans for restoring the CNS Meteorological Monitoring system to operability.
Cause of the malfunction has been identified as the result of an internally generated software alarm within the microprocessor-based Automet V computer unit which halts all data processing. This unit processes and provides signal conditioning for each meteorological parameter and generates the corresponding output signal to indication and recording devices. Failure of the Automet V unit results in loss of indication for all meteorological parameters.
Correspondence with the manufacturer of the Automet V revealed several potential causes for the alarm condition and suggested method of resolution.
Implementation of manufacturer recommendations would not provide satisfactory system operation for any extended period of time (usually 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or less). The manufacturer has now deemed it unfeasible to attempt to resolve this problem with the unit installed and has requested it be returned to their facility for repair.
The Automet V unit was returned to the manufacturer on July 1, 1987 with the request for repairs to be expedited.
Its return to CNS and subsequent installation should allow the system to be restored to operability.
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