ML20154Q779

Forwards Response to NRC 880810 Request for Addl Info Re Electric Circuit Protection by Current Limiting Fuses, Including Design Stds & Calculation & Tabulation Sheets.W/ Two Oversize Drawings

ML20154Q779
Person / Time
Site:	Browns Ferry
Issue date:	09/21/1988
From:	Gridley R TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
Shared Package
ML20154Q783	List: ML20154Q779 ML20154Q792 ML20154Q825 ML20154Q844 ML20266C749 ML20266C751
References
TAC-62260-C, NUDOCS 8810040061
Download: ML20154Q779 (2)

Text

TENNESSEE VALLEY AUTHORITY CH ATTANOOGA, TENNESSEE 37401 SN 1578 Lookout Place SEP 211988 U.S. Nuclear Regulatory Commission ATTN:

Document Control Oesk Hashington, D.C.

20555 Gentlemen:

In the Matter of

)

Docket Nos. 50-259 Tennessee Valley Authority

)

50-260

)

50-296 BROWNS FERRY NUCLEAR PLANT (BFN) - RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION,

.ECTRIC CIRCUIT PROTECTION BY CURRENT LIMITING FUSES (TAC NO. 62260-C)

This letter provides TVA's response to NRC's August 10, 1988 request for additional information on the above subject.

Included with this letter are the following documents for your review:

BFN Fuse Substitution Program control document (BF6.12)

Design standard OS-E8.1.1 Appendix C Design standard DS-E8.1.2 Appendix 0 Calculations, (ED-00281-88139) 250V DC Reactor HOV Boards 2A, 28, 2C (ED-QO268-88463) 480V Reactor MOV Boards 3A/B CAQR BFP 870175 Sample fuse tabulation sheet Schematic drawings.

45N714-2 250 VDC Reactor HOV Board 1A 45N799-10 480 V Shutdown Aux, power TVA was asked to provide the condition adverse to quality reports (CAQRs) written to document the inadequate fuses identified during the plant walkdowns. CAQR BFP 870175 was written to document the condition that the requirements of updated design standards were not reflected in the BFN fuse program.

To resolve this condition. BFN is generating calculations using updated design standards to specify the appropriate fuses for each application.

In the conclusions and recomendations section of these calculations, a pass / fall status is given for each fuse.

This status indicates that the fuse specified in the calculation is or is not the same fuse that was previously selected.

3DN 8810040061 880921 FDR ADoCK 05000259 P

PDC f

An Equal Octort;nity E mploy er 4

________________ _ SEP 211988 U. S. Nuclear Regulatory Commtsslon The criteria for sizing the fuses is found in section 2 of the calculations.

A representative sample of schematic diagrams are provided with the calculations.

These schematics are typical of the circuits evaluated.

Please refer any questions or comments concerning this submittal to Patrick Carter at (205) 729-2689.

Very truly yours, TENNESSEE VALLEY AUTHORITY R.GridYey,Manae'"

Nuclea'r Licensing and Regulatory Affairs cc (Enclosure):

Ms. S. C. Black, Assistant Director for Projects TVA Projects Olvision U.S. Nuclear Regulatory Commission One White Flint, North

'1555 Rockville Pike Rockville, Maryland 20852 Mr. F. R. McCoy, Assistant Director for Inspection Programs TVA Projects 01 vision U.S. Nuclear Regulatory Commission Region II 101 Harletta Street, NW, Suite 2900 Atlanta, Georgia 30323 Browns Ferry Resident Inspector Browns Ferry Nuclear Plant Route 12, Box 637 Athens, Alabama 35611

._