ML19329B286

Deficiency Rept Re Instrument Mounting Bracket.B&W Brackets Found Seismically Unqualified.Bechtel Analyzed Design & Found It Adequate to Withstand Max Earthquake Per FSAR

ML19329B286
Person / Time
Site:	Davis Besse
Issue date:	11/01/1976
From:	Roe L TOLEDO EDISON CO.
To:
Shared Package
ML19329B285	List: ML19329B286
References
142, NUDOCS 8002040681
Download: ML19329B286 (2)

Text

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q TOLEDO

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LOWELL E. ROE

, %ce President Fecdotees Development 14l91 250-5242 November 1, 1976 -

Serial No.142 4

Docket No. 50-346 Mr. James G. Keppler ,

-- Regional Director, Region III .

Directorate of Regulatory Operations U.S. Nuclear Regulatory Commission i , g D b.

O d u 799 Roosevelt Road

,. Glen Ellyn, Illinois 60137 -

Dear Mr. Keppler:

This letter is submitted in accordance with 10CFR 50.55(e) as a final report regarding the Davis-Besse Nuclear Power Station Unit 1 instrument riounting bracket deficiency, which was reported by telecon between our Mr. C. R. Domeck and your Mr. F. Jablonski on October 1, 1976.

Description of the Deficiency Instrumentation associated with the NSSS has been supplied by Babcock &

Wilco'x, but has been installed by our instrument contractor. Much of the instrumentation is nuclear safety related, and as a result, must be

' seismically installed. Nuclear safety related Bailey differential pressure transmitters uith the generic designation BY were supplied with standard Bailey mounting brackets and were installed using these brackets

- on seismically qualified instrument mounts. It was later discovered that the mounting brackets had not been scismically qualified.

Corrective Action Taken The mounting bracket design has been reviewed and analyzed by Bechtel

- Company, our Architect-Engineer, and has been found to be adequate to withstand the worst condition that could occur during the maximum possibic carthquake as defined in the FSAR.

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,8002040661 - . . .

300 MADISON AVENUE TOLEDO. CH:0 43552 THE TOLEDO EDISON CCMPANY EDISON PLAZA NOV 81976 .

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, , . .Sefsty Implications

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-InAsmuchas'thesubsequentanalysisshowedthemountingbracketdesign t'o'be adequate to withstand the postulated earthquake conditions, there a're no safety implications involved; therefore, the health and safety of the public are not jeopardized.

'Yours very truly, -

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pc29/33-34 cc:

Dr. Ernst Volgenau, Director ,

_ Office of Inspection and Enforcement '

U.S. Nuclear Regulatory Commission Washington, D.C. 20555

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