ML20129J120
| ML20129J120 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 05/23/1985 |
| From: | Tucker H DUKE POWER CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| SD-414-85-07, SD-414-85-7, NUDOCS 8506100017 | |
| Download: ML20129J120 (3) | |
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' DUKE Powen GOMPANY v.o. nox saiso OHAMLOTTE, N.C. 28242 HALH. TUCKER
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.g p 1 N y623, 1985 Dr. J. Nelson Grace, Regional Administrator U. S. Nuclear. Regulatory Commission Region.II i
101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Re: -Catawba Nuclear Station, Unit 2 Docket No. 50-414 Significant Deficiency No. 414/85-07
Dear Dr. Grace:
Pursuant to 10 CFR 50.55(e), please find attached Significant Deficiency Report No. 414/85-07.
Very truly yours, kk h$gg Ital B. Tucker LTP: sib Attachment cc: Director Robert Guild, Esq.
Office of Inspection and Enforcement P. O. Box 12097 U. S. Nuclear Regulatory Commission Charleston, South Carolina 29412 Washington, D. C.
20555 Dr. K. Jabbour Palmetto Alliance Office of Nuclear Reactor Regulation 2135 Devine Street U. S. Nuclear Regulatory Commission Columbia, South Carolina 29205 Washington, D. C.
20555 INPO Records Center Suite 1500 1100 Circle-75 Parkway Atlanta, Georgia 30339 Mr. Jesse L. Riley Carolina Environmental Study Group 854 llenley Place Charlotte, North Carolina 28207 NRC Resident Inspector hgivewa Vd),
Catawba Nuclear Station 13 27 g6% W,,$A*
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e CATAWBA NUCLEAR STATION Report Number: SD 414/85-07 Report Date:
May 23, 1985 Facility: Catawba Nuclear Station, Unit 2 Identification of Deficiency:
On March 15, 1985, Mr. P. K. VanDoorn, NRC Inspector advised Duke Power of concerns related to installation clearances in the Vital Instrumentation and Control Power System batteries. The concerns were raised during a monthly inspection of Unit 1 facilities that are similar in design to Unit 2 facilities. Upon Duke Power's request Mr. R. H. Desai of GNB Batteries, Incorpo.mted, forwarded a telex dated March 18, 1985 advising that the maximum end stringer clearance should be 1/4 inch. A subsequent visual inspection revealed that some end clearances exceeded the new recon-mended limits set by the manufacturer. On March 26, 1985 Mr. R. H. Desai forwarded a telex of a copy of his January 22, 1985 letter to Mr. E. L. Jordan, NRC Washington, D. C. identifying a deficiency in the manufacturer's installation drawings whereby the maximum cicarance was not stated. This letter indicated that failure criteria had not been established during seismic qualification for installations with clearances greater than 1/4 inch between the end cell and the end stringer.
Initial Report:
On April 23, 1985 the deficiency in documentation and installation was identified to Hugh Dance, NRC Region II, by T. L. Utterback and T. J. Al-Hussaini of Duke Power Company as applicable to Catawba Unit 2.
Suppliers and or Components:
Types NCX-750 and NCX-1200 battery banks are manufactured by GNB Batteries.
Incorporated for use in the 125 VDC Vital Instrumentation and Control Power System application.
Description of Deficiency:
The manufacturer's drawings detailing installation of the seismic racks indicate that a minimum cicarance of 1/8 inch must be maintained between the end cell and the end stringer. This is actually a typical dimension, and according to CNB the drawings should indicate a 0-1/4 inch clearance range. The batteries that were installed in accordance with the drawings had no documented maximum clearance requirement, and upon inspection it was noted that the end cicarance exceeded 1/4 inch in several areas.
Safety implications:
The possibility of battery failure during a seismic event exists in installations with excessive end cicarances, due to impact of the end cell against the end stringer and resultant failure of cell jar integrity.
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. Corrective Action:
._ena The insta11a' tion drawings and the battery racks are in the process'of modifi-cation to conform with recommendations of the manufacturer. Drawings will be revised to agree with manufacturer recommendations and. issued for implementation.
The modifications will be implemented concurrently with another project;-
specifically, reinsta11ation of the battery cells that are presently being returned to the manufacturer-for rejarring. Both of these projects will be completed for Unit 2 by September 1, 1985.
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