ML18082A016

Forwards Mods to 781017 Design Details & Diagrams for Const of Cable Tray Fire Stops in Reactor Bldg.Mod Does Not Affect Ability of Fire Stop to Perform Function.Requests NRC Review & Approval

ML18082A016
Person / Time
Site:	Rancho Seco
Issue date:	03/07/1980
From:	Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Reid R Office of Nuclear Reactor Regulation
References
NUDOCS 8003130567
Download: ML18082A016 (3)

Text

• * -!AME!!' MUNICIPAL UTILITY DISTRICT D 6201 S Stmot, Bo> 15830, Soommooto, C*llfoml*

95813, (916) 452-3211 March 7, 1980 Director of Nuclear Reactor Regulation ATTN: Mr. Robert W. Reid, Operating Reactors, Branch 4 U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Dear Mr. Reid:

On October 17, 1978, the District provided you with specific design details for the construction of cable tray fire stops in the reactor building.

Your December 14, 1978 letter to the District approved the design. Due to installation problems, the District modified the design. *The modification was to extend the marinite board on the bottom of the tray 3 inches from the center of the fire stop instead of five inches as cated in our October 17, 1978 letter. Attached Figures One & Two indicate the modifications.

The modification does not affect the ability of the fire stop to perform its function.

No other changes in the design described in our October 17, 1978 letter have been made. The NRC resident inspector will not accept the present design of the fire stop until your approval is received.

The District is committed to have all fire stops installed and approved by the end of the refueling outage. To prevent any delay in plant start-up, please review and approve the modified design by March 13, 1980. If you have any questions or comments, please have your staff contact Robert Daniels immediately at (916) 452-3211, Ext. 613. Attachments Sincerely, dhn Mattimoe Assistant General Manager and Chief Engineer ffoo3/3D f:J{,7 t7JOQ%JJI I){o 7 A N E L E C T R I C S Y S T E M S E R V I N G M 0 R E T H A N 6 0 0 , 0 0 0 I N T H E -A R T 0 F C A l I F 0 R N I A

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• • . MAR I t-11 TE D (TYP.) F'LDOR OR WALL OPHlll-JG FA5THJ BOARD TO i="LOOR OR WAia.WiTH NELSON STUDS ( 1/4"-20" 1 1/z" ) WITH ll.IUT..-VASHE"R OR HILTI STUD. KWll<-e,6LI OR ).JAIL AS FIE:LD COIJDITIOIJS DIC.TATE;:..

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TRA'{ SUPPORTS WI-IE.RE POSS! BLE ';/4" MARllJITE BOARD . (TOP, BOT. 4 51DE.5) T't'P. %r MAR HJ IT E BOARD (TYP.)

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'STOP ATTACHMENT 2 10-12-78