ML20246G007
| ML20246G007 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 07/06/1989 |
| From: | Tucker H DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 8907140122 | |
| Download: ML20246G007 (2) | |
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. July 6, 1989 Document Control Desk U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Subject:
Catawba Nuclear Station, Unit 1 Docket No. 50-413 Special Report Gentlemen:
Pursuant to Technical Specificat.lon 3.3.3.9, please find attached a Specia1 Report concerning the inoperability of Channel No. 6'of the Catawba Unit i Vibration-and Loose Parts Monitor System for more than thirty days. Channel No.~ 6.
.was declared. inoperable on May 21, 1989. This report was schedulled for submittal to the NRC on June 30, 1989. I apologice for the slight' delay.
- Very'truly yours, b.
B. Tucker b
JGT/3/SR9-54 xc:
Mr. S. D. Ebneter Regional Administrator, Region II U. S. Nuclear Regulatory Commission 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. W. T. Orders NRC Resident Inspector Catawba Nuclear Station 89071401g(($o3Its PDR ADO PDC S
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I CATAWBA NUCLEAR STATION, UNIT 1
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SPECIAL REPORT I
INOPERABILITY OF CHANNEL No. 6 OF THE STEAM GENERATOR IB
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l LOOSE PARTS MONITOR SYSTEM 1
i On May 21, 1989 Channel No. 6 of the Catawba Nuclear Station Unit 1 Steam Generator IB Vibration and Loose Parts Monitor System was declared inoperable.
The inoperability of Channel No. 6 was discovered by Operations personnel when i
the Channel emitted c 60 cycle signal after being selected for indication.
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Previous malfunctions of this system at Catawba Nuclear Station involved loose 4
wiring, loose connections, or faulty accelerometers.
Channel No. 10 of the Unit 1 Steam Generator 1A is operable. Therefore, a redundant channel is available. Work request 506860PS was written to investigate and repair the channel. The repair will be ca:.ied out during a future outage of sufficient duration. This work is to be performed during an outage due to Channel No. 6 being located in the steam generator cavity. This cavity is inaccessible during power operation because of radiological considerations.
The inoperability of Channel No. 6 for more than 30 days is reportable pursuant to Catawba Technical Specification 3.3.3.9.
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