ML19329B286
| ML19329B286 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 11/01/1976 |
| From: | Roe L TOLEDO EDISON CO. |
| To: | |
| Shared Package | |
| ML19329B285 | List: |
| References | |
| 142, NUDOCS 8002040681 | |
| Download: ML19329B286 (2) | |
Text
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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 O
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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 1 instrument report regarding the Davis-Besse Nuclear Power Station Unit 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 &
Much of Wilco'x, but has been installed by our instrument contractor.
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 THE TOLEDO EDISON CCMPANY EDISON PLAZA 300 MADISON AVENUE TOLEDO. CH:0 43552 NOV 81976 m
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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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Dr. Ernst Volgenau, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
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