ML18033A685

Forwards Request for Addl Info on Cable Ampacity Program Plan Submitted by Util 880707 & 0930 Ltrs for Response by 890428

ML18033A685
Person / Time
Site:	Browns Ferry
Issue date:	03/21/1989
From:	Black S Office of Nuclear Reactor Regulation
To:	Kingsley O Tennessee Valley Authority
References
TAC-62260 NUDOCS 8903300093
Download: ML18033A685 (6)

Text

Docket No. $0-260 March 21, 1989 Mr. Oliver D. Kingsley, Jr.

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

Dear Mr. Kingsley:

Distribution NRC PDR Local PDR Projects Reading ADSP Reading DCrutchfield BDLiaw RPierson SB'lack LWatson MSimms GGears DMoran WSLittle JRutberg SVarga BGrimes EJordan ACRS(10)

GPA/PA GPA/CA BFN Rdg.

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION CABLE AMPACITY PROGRAM PLAN-TENNESSEE VALLEY AUTHORITY, BROWNS FERRY NUCLEAR PLANT, UNIT 2 (TAC 62260)

The staff has reviewed the Tennessee Valley Authority (TVA) Cable Ampacity Program Plan for Browns Ferry, Unit 2, submitted by letter of July 7, 1988 and supplemented by letter dated September 30, 1988.

We find that additional information is necessary to enable the staff to complete its review of the subject program.

Please transmit your responses to the request for additional information, enumerated in the enclosure,.by April 28, 1989. If you have any questions, please call Mr. David H. Moran, Project Manager on (301) 492-0796.

The reporting and/or recordkeeping requirements contained in this letter affect fewer then ten respondents; therefore, OMB clearance is not required under P.L.96-511.

Sincerely, Original signed by Rajender Auluck for

Enclosure:

Request for Additional Information cc w/enclosure:

See next page Suzanne C. Black, Assistant.Dir'ectot'-=

for Projects TVA Projects Division Office of Nuclear Reactor Regulation 8903300093 890321 PDR ADOCK 05000260 P

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ENCLOSURE Request for Additional Information for TVA Browns Ferry 2 Ampacity Program We have reviewed TVA's ampacity program submitted by letters dated July 7, 1988 and September 30, 1988 and have concluded that a number of assumptions associated with TVA's computer code simulations require confirmation.

We have, therefore, determined that in order to expeditiously resolve this issue some additional independent worst-case simulations should be conducted.

The staff and its consultant, Sandia National Laboratory, plan to conduct confirmatory simulations using a code available at Sandia.

A comparison of the results from these simulations with results from the same simulations on TVA's code, should confirm the adequacy of TVA's ampacity program and its underlying assumptions.

Therefore, we request that TVA conduct the following simulations and send the results of these simulations to the staff.

CASE I:

Overloaded cables not to exceed hot spot critical area DATA 22 cables in 18" wide tray, size 4/0 with 16 cables

unloaded, 4 cables loaded to 1005 of the Stolpe value, and two cables overloaded by the same amount.

QUESTION:

What is the greatest amount of overload allowed by the diversity program for the two overloaded cables assuming the overloaded cables are not safety-related, but the cables loaded at 100$ are safety-related.

Also, what is the predicted maximum temperature in the lOOX loaded and in the overloaded cables?

CASE 2:

Over loaded cables to exceed the hot spot critical area DATA:

22 cables in 18" wide tray, size 4/0 with 16 cables unloaded and six cables overloaded by the same amount.

QUESTION:

What is the greatest amount of overload allowed by the diversity program for the six overloaded cables assuming the overloaded cables are safety-related.

Also, what is the predicted maximum temperature in the overloaded cables?

Mr. Oliver D. Kingsley, Jr. Browns Ferry Nuclear Plant CC:

General Counsel Tennessee Valley Authority 400 West Summit Hill Drive E11 B33 Knoxville, Tennessee 37902 Mr. R. L. Gridley Tennessee Valley Authority 5N 157B Lookout Place Chattanooga, Tennessee 37402-2801 Mr. C.

Mason Tennessee Valley Authority Browns Ferry Nuclear Plant P.O.

Box 2000

Decatur, Alabama 35602 Mr. P. Carier Tennessee Valley Authority Browns Ferry Nuclear Plant P.O.

Box 2000

Decatur, Alabama 35602 Mr. D. L. Williams Tennessee Valley Authority 400 West Summit Hill Drive W10 B85 Knoxville, Tennessee 37902

Chairman, Limestone County Commission P.O.

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 Resident Inspector/Browns Ferry NP U.S. Nuclear Regulatory Commission Route 12, Box 637

Athens, Alabama 35611 Dr. Henry Myers, Science Advisor Committee on Interior and Insular Affairs U. S.

House of Representatives Washington, D.C.

20515 Tennessee Valley Authority Rockvi lie Office 11921 Rockville Pike Suite 402 Rockville, Maryland 20852

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