ML20149M010

Responds to Util 870518 Response to Generic Ltr 86-16 Re Westinghouse ECCS Evaluation Models.Agrees W/Util Position That Reanalyses for Plant Not Required.Section 6.3.5 of SER Will Be Updated in Future Suppl to Reflect NRC Position

ML20149M010
Person / Time
Site:	Comanche Peak
Issue date:	02/23/1988
From:	Charemagne Grimes NRC OFFICE OF SPECIAL PROJECTS
To:	Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
References
GL-86-16, NUDOCS 8802250233
Download: ML20149M010 (5)

Text

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., UNITE 3 STATES

%, 8' e NUCLEAR REGULATORY COMMISSION i I w AsMG TON, D. C. Mll ,

s.,*..../ February 23, 1988 Occket Nos. ';0-445 and 50-446 ,

. Mr. William G. Cour,sil

! Executive Vice President i Texas Utilities Eler 91c Company 400 North Olive Street, Lock 00x 81 Dallas, Texas 75201 l

SUBJECT:

WESTIhGHOUSE ECCS MODELS - GENERIC LETTER 86-16 By letter dated May 18, 1987 (TXX-6444), you provided a response to Generic

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Letter 86-16. Westinghouse ECCS Evaluation Models (October 22,1986). Your -

response maintains ti.at the Generic Letter does not require an ECCS reanalysis 4

for Comanche Peak Steam Electric' Station (CPSES), Units 1 and 2 or for the ,

, planned CPSES Unit 2 FSAR amendment for optimized fuel assemblies. The staff has reviewed your response and agrees in part and disagrees in part with your position as discussed celow.

The staff agrees with your position that reanalyses for Units 1 and 2 are  ;

not required. As stated in Generic Letter 86-16, the staff has accepted i Westinghouse's assessment that the errors in the 1978 and 1981 ECCS Evaluation ~

Models temperatureusing(WREFLOOD each result PCT) and that there is amplein amargin 6-12*Ffor underprediction of peak clad all facilities between the maximum PCT contained in 10 CFR 50.46 and the calculated PCT. You have

affimed that this is the :'.tuation for CPSES, Units 1 and 2, which h&ve '

l calculated PCTs of 2010.7'F and 1808'F, respectively. These are well below

{ the 10 CFR 50.46 PCT limit of 2200'F. The staff will update Section 6.3.5 l i

of the CPSES Safety Evaluation Report in a future supplement to reflect the i i staff's position.

l Generic Letter 86-16 does not specifically refer to future submittals of 1 analyses which were performed using the 1978 and 1981 versions of the model with i

WREFLOOD, but not using BART, because Westinghouse iridicated to the staff that the 1978 and 1981 models with WREFLOOD would not be modified or used in future ECCS analyses. For that reason, the staff addressed only the 1981 version of  !

q WREFLOOD with BART in its August 25, 1986 evaluation of Topical Report WCAP 9561.

Addendum 3, Revision 1. "Thimble Modeling in Westinghouse ECCS Evaluation Model."

i The staff understands that the planned CPSES Unit 2 FSAR amendment for optimized i

fuel assemblies is to be supported by the 1981 version of the Westinghouse ECCS Evaluation Model using WREFLOOD, but not using BART, which was prepared prior 1

to Westinghouse identifying the errors discussed above. Since this analysis was performed a number of years ago and has yet to be submitted, the CPSES Unit 2 FSAR amendment for optinized fuel assemblies should be supported by an updated ECCS analysis. .

' l r802250233 800223 5 ,

l DR ADOCK 0500 i

l Texas Utilities Electric Company Mr. William G. Counsil Should you have any questions regarding this evaluation, please contact' Melince Malloy (301-492-0738) or Annette Vietti-Cook (301-492-0737), Project Managers for the CPSE3.

Sircerely.

.M %LLW\

Christopher 1. Grimes. Director Corranche Peak Project Division Office of Special Projects cc: Sea next page

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I 2 W. G. Counsil Comanche Peak Steam Electric Station Texas Utilities Electric Company Units 1 and 2 cc:

Jack R. Newman, Esq. Asst. Director for Inspec. Programs Newman & Holtzinger, P.C. Comanche Peak Project Division Suite 1000 U.S. Nuclear Regulatory Commission 1615 L Street, N.W. P. O. Box 1029 Washington, D.C. 20036 Granbury, Texas 76048 i Robert A. Wooldridge, Esq. Regional Administrator, Region IV-Worsham, Forsythe, Sampels & U.S. Nuclear Regulatory Commission Wooldridge 611 Ryan Plaza Drive, Suite 1000 2001 Bryan Tower, Suite 2500 Arlington, Texas 76011 Dallas, Texas 75201 Lanny A. Sinkin Mr. Homer C. Schmidt Christic Institute Director of Nuclear Services 1324 North Capitol Street Texas Utilities Electric Company Washington, D.C. 20002 Skyway Tower -

400 North Olive Street, L.B. 81 Ms. Billie Pirner Garde, Esq.

Dallas, Texas 75201 Government Accountability Project '

Midwest Offica Mr. Robert E. Ballard, Jr. 104 East Wisconsin Avenue i Director of Projects Appleton, Wisconsin 54911 Gibbs and Hill, Inc.

11 Penn Plaza New York, New York 10001 David R. Pigott, Esq.

Orrick, Herrington & Sutcliffe 600 Montgomery Street Mr. R. S. Howard San Francisco, California 94111 Westinghouse Electric Corporation P. 0. Box 355 Anthony Z. Roisman, Esq.

Pittsburgh, Pennsylvania 15230 Suite 600 1401 New York Avenue, NW Renea F c. : , Esq. Washington, D.C. 20005 Assh q  ?,torney General Envire.m ntal Protection Division Robert Jablen P. O. Box 12548, Capitol Station Bonnie S. Blair Austin, Texas 78711 ,' Spiegel & McDiarmid 1350 New Yw k Avenue, NW Mrs. Juanita Ellis, President Washington, D.C. 20005-4798 Citizens Association for Sound Energy x 1426 South Polk '

' George A. Parker, Chafrman Dallas, Texas 75224 '

Pt.blic Utility Comittee  ;

Senior Citizens Alliance Of Ms. Nancy H. Willians Tarrant County, Inc.

CYGNA Energy Services 6048Jonder Drive 2121 N. California Blvd., Suite 390 Fort Wo'rth, inas 76D3 l Walnut Creek, CA 94596

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W. G. Couns11 Comanche Peak Electric Station Texar Utilities Electric Company Units 1 and 2 cc:

Joseph F. Fulbright Fulbright & Jaworski 1301 McKinney Street houston, Texas 77010 Roger D. Walker Manager, Nuclear Licensing Texas Utilities Electric Company Skyway Tower 400 North Olive Street, L.B. 81 Dallas, Texas 75201 Mr. Jack Redding c/o Bethesda Licensing Te.:as Utilities Electric Company 3 Metro Center, Suite 610 Bethesda, Maryland 20814 -

William A. Burchette, Esq.

Counsel for Tex-La Electric Cooperative of Texas Heron, Burchette, Puckert & Rothwell Suite 700 1025 Thomas Jefferson Street, NW Washington, D.C. 20007 James P. McGaugby, Jr.

GDS Associates, Inc.

Suite 720 1850 Parkway Place Marietta, Georgia 30067 Administrative Judge Peter Bloch U.S. fiuclear Regulatory Consnission Washington, D.C. 20555 Elizabeth B. Johnson Administrative Judge Oak Ridge National Laboratory P. O. '30x X, Building 3500 Oak Ridge, Tennessee 37830 l

Dr. Kenneth A. McCollom 1107 West Knapp  !

Stillwater, Oklahoma 74075 i

Dr. Walter H. Jordan I c/o Carib Terrace Motel l 522 N. Ocean Boulevard -

Pompano Beach, Florida 33062

Texas Utilities Electric Company Mr. William G. Counsil Distribution:

.55cETTiTee-PDR-Local PDR OSP Reading CPPD Reading -

S. Ebneter/J. Axelrad C. Grimes P. McKee J. Lyons R. Warnick M. Malloy A. Vietti-Cook J. H. Wilson J. Moore, OGC CPPD-LA W. Hodges R. Jones F. Miraglia E. Jordan J. Partlow ACRS(10) n est .,r\stbb' 0FC :0SP:CP :0SP: :0SP: :0SP:CPPD :NRR:JRXB (T :0G #

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DATE :2/g/88 :2//2/88 :2//z/88 :2//Z/88 :2/I T/88 :2//1/88 0FC :DD:0SP:CPPD :D:CPPD:0SP  :  :  :  :

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DATE :2/AD/88 :2A$)/88  :  :  :