IR 05000259/1997003

Requests for Addl Info Re Offsite Power Control Power Supplies Due to 970305 Loss of Offsite Power as Discussed in LER 97-001 & Insp Repts 50-259/97-03,50-260/97-03 & 50-296/97-03

ML20140F092
Person / Time
Site:	Browns Ferry
Issue date:	06/10/1997
From:	Williams J NRC (Affiliation Not Assigned)
To:	Kingsley O TENNESSEE VALLEY AUTHORITY
References
50-259-97-03, 50-259-97-3, 50-260-97-03, 50-260-97-3, 50-296-97-03, 50-296-97-3, TAC-M98305, TAC-M98306, TAC-M98307, NUDOCS 9706120303
Download: ML20140F092 (3)

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UNITED STATES ) e y

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j NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20666-0001

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June 10,1997 l

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Mr. Oliver D. Kingsley, Jr.

! President, TVA Nuclear and Chief Nuclear Officer Tennessee Valley Authority 6A Lookout Place 1101 Market Street l Chattanooga, TN 37402-2801

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SUBJECT: BROWNS FERRY NUCLEAR PLANT UNITS 1, 2, AND 3 - REQUEST FOR

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ADDITIONAL INFORMATION REGARDING OFFSITE POWER CONTROL POWER l SUPPLIES (URI 97-03-01) (TAC NOS. M98305, M98306, AND M98307) i

Dear Mr. Kingsley:

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On March 5,1997, Browns Ferry Nuclear Plant (BFN) Unit 3 experienced a loss of offsite power. This incident is discussed in Licensee Event Report 50-296/97-001 and in Nuclear Regulatory Commission (NRC) Inspection Report 50-259, 260, 296/97-03. As stated in the Inspection Report, it was noted that there is only a single control power source for switchyard components, which I has led to a question as to whether the BFN switchyard control power l configuration satisfies General Design Criterion 17. The NRC Region II staff ,

has referred this question to the Office of Nuclear Reactor Regulation (NRR) ff l l

for its review. To complete this review, the NRR staff has determined br addition:1 information will be required. The information requested is as follows: I 1. For each offsite power circuit (immediately available and delayed l

access) to shutdown boards, provide the control power source (i.e.,

which battery) for all the required breakers (including 500 kV,161 kV, generator breaker, Unit Board and Shutdown Board breakers).

l l 2. Discuss the availability of offsite power (immediately available and delayed access) to shutdown buses during a single event (i.e., loss of a battery board or loss of unit station service transformer, etc.)

assuming that no onsite power is available. The discussion should include how the tripping and closing of different breakers will be performed. Additionally, if delayed access offsite power is available,

! discou the time delay involved so that specified acceptable fuel design

limits and design conditions of the reactor coolant pressure boundary are not exceeded.

ucc,s2 NBC HLE CHgER COPY 9706120303 970610

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.o DR ADOCK 05000259 PDR

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! Oliver l Your response within 60 days of the date of this letter will allow a timely I assessment of this issue, and will be greatly appreciated.

Please contact me at (301)415-1470 if you have any questions on this topic.

Sincerely, j

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n JosepN.a(7p1,ems,#P roject Manager Project Directorate II-3 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation Docket Nos. 50-259, 50-260, and 50-296 cc: See next page 1 Distributio_q Docket File PUBLIC 1 BFN Rdg. Reading SVarga l OGC ACRS JJohnson, RII APal ETomlinson BMozafari

DOCUMENT NAME: G:\BFN\M98305.RAI To receive a copy of this document, indicate in the box: "C" = Copy without attachment / enclosure, "E" = Copy with attachment / enclosure "N" = No copy 0FFICE P911 3/PM /d j lC Poll-3/LA s j lCe PDil-3/D ,) lC l NAME JWilliams /"/ "

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DATE 06/ % /97 06/]D/97 OfflCIAL RECORD COPY I

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l Mr. Oliver D. Kingsley, Jr. BROWNS FFRRY N'JCLEAR PLANT Tennessee Valley Authority l

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Mr. O. J. Veringue, Sr. Vice President Mr. Timothy E. Abney, Manager l Nuclear Operations Licensing and Industry Affairs i Tennessee Valley Authority Browns Ferry Nuclear Plant '

6A Lookout Place Tennessee Valley Authority 1101 Market Street P.O. Box 2000 Chattanooga, TN 37402-2801 Decatur, AL 35609 Mr. Jack A. Bailey, Vice President Regional Administrator Engineering & Technical Services U.S. Nuclear Regulatory Commission Tennessee Valley Authority Region II

, 6A Lookout Place 61 Forsyth Street, SW., Suite 23T85 1101 Market Street Atlanta, GA 30303-3415 Chattanooga, TN 37402-2801 Mr. Leonard D. Wert Mr. C. M. Crane, Site Vice President Senior Resident Inspector Browns Ferry Nuclear Plant Browns Ferry Nuclear Plant Tennessee Valley Authority U.S. Nuclear Regulatory Commission P.O. Box 2000 10833 Shaw Road Decatur, AL 35609 Athens, AL 35611 General Counsel Chairman l Tennessee Valley Authority Limestone County Commission ET 10H 310 West Washington Street 400 West Summit Hill Drive Athens, AL 35611 *

Knoxville, TN 37902 l State Health Officer i Mr. Raul R. Baron, General Manager Alabama Department of Public Health l Nuclear Assurance and Licensing 434 Monroe Street Tennessee Valley Authority Montgomery, AL 36130-1701 4J Blue Ridge 1101 Market Street Chattanooga, TN 37402-2801 Mr. Masoud Bajestani, Plant Manager Browns Ferry Nuclear Plant I Tennessee Valley Authority i P.O. Box 2000 l Decatur, AL 35609 j l

Mr. Pedro Salas, Manager Licensing and Industry Affairs i Tennessee Valley Authority  :

4J Blue Ridge l 1101 Market Street l Chattanooga, TN 37402-2801 l l

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