ML18033B357

Requests Addl Info Re Completed Dependency Matrix of safety-related Loads Supplied by Emergency Diesel Generators & Emergency Batteries,Per 900521 Agreement

ML18033B357
Person / Time
Site:	Browns Ferry
Issue date:	06/06/1990
From:	Ross T Office of Nuclear Reactor Regulation
To:	Kingsley O TENNESSEE VALLEY AUTHORITY
References
NUDOCS 9006120431
Download: ML18033B357 (10)

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i UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 June 6, 1990 Docket No. 50-260 Mr. Oliver D. Kingsley, Jr.

Senior Yice President, Nuclear Power Tennessee Valley Authority 6N 38A Lookout Place 1101 Market Street Chattanooga, Tennessee 37402-2801

SUBJECT:

IIITERRELATED SAFETY SYSTEM DEPENDENCIES On May 4, 1990, the NRC Project Manager (PH) for the Browns Ferry Nuclear Plant (BFN) delivered a blank dependency matrix of safety-related loads supplied by the emergency diesel generators (EDG) and emergency batteries to the Tenneessee Valley Authority (TVA) office in Rockville, Maryland.

At that time, the PH informally requested TVA Licensing for BFN to complete the subject dependency matrix in order for the NRC staff to evaluate the EDG configuration needed to support Unit 2 operations.

The NRC staff is interested in better understanding the dependencies among loads supplied by the six EDGs required to be operable by Technical Specifications for BFN, Unit 2 (assuming only Unit 2 is in operation).

In particular, our concerns lie in ascertaining if any anomalous vulnerabi lities exist within the interrelationships of safety systems supplied by the EDGs and their associated support systems.

In addition, the staff is also interested in the dependendcies among safety-related loads supplied by the emergency batteries.

A dependency matrix, such as the one provided to TVA, is considered an acceptable method for illustrating the way systems are interrelated.

In a conference call with TVA Licensing on May 21, 1990, the staff provided further clarifications regarding the information necessary from TYA to complete the dependency matrix of Hay 4.

Both the staff and TVA came to a consensus during this conference call as to the content and form of a dependency matrix the staff would find useful in its subsequent evaluation.

The purpose of this letter is to followup the aforementioned telecon with a formal request that TVA submit to the NRC a completed dependency matrix, or equivalent, as was agreed upon on May 21.

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'I Nr: Oliver D. Kingsley TVA is requested to submit their response by August 10, 1990, this schedule was previously dicussed and concurred to by TVA Licensing for BFN.

Should TVA

, need aiiy further information regarding the NRC's request, please contact the NRC PN for BFN; Thierry N. Ross.

S incere ly, Original signed by.

Thierry Ross,'roject hianager Project Directorate II-4 Division of Reactor Projects I/II Office of Nuclear Reactor Regulation cc:

See next page Distribution NRC PDR Local PDR BFN Reading S. Varga G. Lainas F. Hebdon S. Black B. Wilson W. S. Little H. Krebs T. Ross D. Moran OGC B. Grimes E. Jordan ACRS (10)

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Mr: Oliver D. Kingsley TVA is requested to submit their response by August 10, 1990, this schedule was previously dicussed and concurred to by TVA Licensing for BFN.

Should TVA need any further information regarding the NRC's request, please contact the NRC PM for BFN, Thierry M. Ross.

Sincerely, cc:

See next page Suzanne Black; Assistant Director for Projects TVA Projects Division Office of Nuclear Reactor Regulation Distribution NRC PDR Local PDR BFN Reading ADSP Reading D. Crutchfield T. quay B.

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1 Mr: Oliver D. Kingsley TVA is requested to submit their response by August 10, 1990, this schedule was previously dicussed and concurred to by TVA Licensing for BFN.

Should TVA need any further information regarding the NRC's request, please contact the NRC PM for BFH, Thierry M. Ross.

S incere ly, Original signed by Thierry Ross, Project Manager Project Directorate II-4 Division of Reactor Projects I/II Office of Nuclear Reactor Regulation cc:

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Mr. Marvin Runyon, Chairman Tennessee Valley Authority ET 12A 7A 400 West Summit Hill Drive Knoxville, Tennessee 37902 Mr. C. H. Dean, Jr., Director Tennessee Valley Authority ET 12A 11A 400 West Summit Hill Drive Knoxville, Tennessee 37902 Mr. John B. Waters, Director Tennessee Valley Authority ET 12A 9A 400 West Summit Hill Drive Knoxville, Tennessee 37902 Mr. W. F. Willis Chief Operating Officer ET 12B 16B 400 West Summit Hill Drive Knoxville, Tennessee 37902 General Counsel Tennessee Valley Authority 400 West Summit Hill Drive ET 11B 33H Knoxville, Tennessee 37902 Nr. Dwight Nunn Vice President, Nuclear Engineering Tennessee Valley Authority 6N 38A Lookout. Place 1101 Market Street Chattanooga, Tennessee 37402-2801 Dr. Mark 0. Medford Vice President and Nuclear Technical Director Tennessee Valley Authority Chattanooga, Tennessee 37402-2801 Mr. Edward G. Wallace

Manager, Nuclear Licensing and Regulatory Affairs Tennessee Valley Authority 5N 157B Lookout Place Chattanooga, Tennessee 37402-2801 Mr. 0. J. Zeringue, Site Director Browns Ferry Nuclear Plant Tennessee Valley Authority P. 0.

Box 2000

Decatur, Alabama 35602 Mr. P. Carier, Site Licensing Manager Browns Ferry Nuclear Plant Tennessee Valley Authority P. 0.

Box 2000

Decatur, Alabama 35602 Mr. L. W. Myers, Plant Manager Browns Ferry Nuclear Plant Tennessee Valley Authority P. 0.

Box 2000

Decatur, Alabama 35602

Chairman, Limestone County Commission P. 0.

Box 188

Athens, Alabama 35611 Claude Earl Fox, M.D.

State Health Officer State Department of Public Health State Office Building Montgomery, Alabama 36130 Regional Administrator, Region II U.S. Nuclear Regulatory Commission 101 Marietta Street, N.W.

Atlanta, Georgia 30323 Mr. Danny Carpenter Senior Resident Inspector Browns Ferry Nuclear Plant U.S. Nuclear Regulatory Commission Route 12, Box 637

Athens, Alabama 35611 Tennessee Valley Authority Rockvi lie Office 11921 Rockvi1 le Pike Suite 402 Rockvi 1 le, Maryland 20842

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