ML20072P956

Commits to Provide Min Physical Separation of 5 Ft Between DHR Sys & Steam Generator Auxiliary Heat Removal Sys Cabling in Same Div.Commitment Resolves SER Open Item 2

ML20072P956
Person / Time
Site:	Clinch River
Issue date:	04/01/1983
From:	Longenecker J ENERGY, DEPT. OF, CLINCH RIVER BREEDER REACTOR PLANT
To:	Grace J Office of Nuclear Reactor Regulation
References
HQ:S:83:238, NUDOCS 8304040427
Download: ML20072P956 (2)

Text

___ _ ,

O Department of Energy -

Washington, D.C. 20545 ~

Docket No. 50-537 APR 011983 HQ:S:83:238 Dr. J. Nelson Grace, Director CRBR Program Office Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission

,ashington, D.C. 20555

Dear Dr. Grace:

ADDITIONALINFORMATIONONTHECLINCHRIVERBREEDERREACTORPLANT(CRBRP)

INSTRUMENTATION AND CONTROLS

Reference:

Letter HQ:S:83:216, J. R. Longenecker to J. N. Grace, same subject, dated February 15, 1983 Enclosure 5 of the reference discussed the project position on Principal Design Criterion 35, with the following summary:

"In summary, the three scenarios explained above conservatively illustrate how the top level requirements provided in CRBRP Principal Design Criterion 35 for the Re:idual Heat Removal Systems are satisfied even though a failure in one division of lE power (e.g. , cable fire affecting DHRS and SGAHRS cables in the same cable tray) can affect both SGAHRS and DHRS."

The project position is that Regulatory Guide 1.75 is not applicable in this instance for separating Decay Heat Removal Service (DHRS) and Steam Generator Auxiliary Heat Removal System (SGAHRS) cabling in the same division. However, for good engineering practices, the project commits to provide a minimum physical separation of five feet between DHRS and SGAHRS cabling of the same division, thus providing added conservatism.

This consnitment has been discussed with the Nuclear Regulatory Commission's '

staff reviewer on March 30, 1983, as an acceptable resolution to Safety Evaluation Report open item 2, physical separation of DHRS and SGAHRS cabling.

po I hD DO O O 37 j E PDR

AO-Any questions regarding the enclosed information may be addressed to Mr. D. Hicks (FTS 626-6022) or Mr. A. Meller (FTS 626-6355) of the Fisject Office Oak Ridge staff.

Sincerely, Jo R. Longene er Acting Director, Office of Breeder Demonstration Projects Office of Nuclear Energy cc: Service List Standard Distribution Licensing Distribution I

I I