ML19325E756

Nonproprietary Suppl 2 to Addl Info in Support of Evaluation of Thermal Stratification for Comanche Peak Unit 1 Pressurizer Surge Line.

ML19325E756
Person / Time
Site:	Comanche Peak
Issue date:	10/31/1989
From:	Cranford E, Mutyala B WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML19292J542	List: ML19325E752 ML19325E754 ML19325E756
References
WCAP-12247-S02, WCAP-12247-S2, NUDOCS 8911080409
Download: ML19325E756 (8)

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WESTINGHOUSE CLA55 3 i 1

WCAP Itt47 j Supplement t  ;

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ADDITIONAL INFORMATION IN SUPPORT OF j I

THE EVALUATION OF THERNAL STRATIFICATICH i

FOR THE CONANCHE PEAK UNIT 1 PRES $URIZER SURGE LINE l, i

. E. L. Cranford i B. R. Mutysla l l .. \

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3

• - October 1989 l 1i .

1 Verified by: _

Verified ty: $ '/

4 K.c.GMag f 5. J. (gri  !

l Approved by:

Oy Approved L + c-R. s.' ratel, manager 3. 3. Falusamy, manager i Systems Structural Structural Materials  ;

Analysis Engineering i i

l

.. j WESTINGHOUSE ELECTRIC CORPORATION Nuclear and Advanced Technology Division  ;

P.O. Box 2728 Pittsburgh, Pennsylvania 15230-2728

I  !

l FOREWORD l l

A conference call between Nuclear Regulatory Commission, Texas Utilities and l

. Westinghouse was held on Octc6er 20, 1989. This is to further clarify the responses provided in the WCAP 12248, Supplement 1. NRC's questions on  ;

heatup/cooldown transients, monitoring' program, annimum predicted vertical i displacements anywhere in the pipe, and maximum equation 12 stress and the l corresponding allowable stress were clarified and no further documentation is I required.

In addition, pipe delta T, system delta T, and tables 1-3 and 1-4 of the  !

WCAP-12248 was discussed in detail. Sincethissummary(especiallyhowpipe l

delta T was developed in tables 1-3 and 1-4) is not clearly explained in the j original WCAP-12248 and Supplement 1 NRC requested that this discussion be l documented. The summary of this discussion is provided on the following i pages. Also, this supplement contains an errata section which provides  !

• corrections to typographical errors that existed in the original WCAP-12248, f

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SUMMARY

OF ADDITIONAL INFORMATION  !

FOR l

.. TABLES 1-3 AND 1-4 Nodification of the pressuriser surge line transients.to account for thermal stratification was accomplished by replacing the existing heatup and I tooldown transients with a new set of transients that were based on actual  !

monitoring data from several plants. The new heatup and cooldown transients f

are provided in table 1-3 of WCAP 12248. Analysis of the sonitoring data j resulted in the conclusion that two basic forms of stratification should be l consider 6d in fatigue analysis. [

l 1 .

, 1'C

8 In order'to assure conservative design it is necessary to i l net only replace the existing heatup and cooldown transients but to modify i I

the existing normal and upset transients to account for the effects of stratification.

Modification of the existing normal and upset transients is accomplished by first interpreting these previously defined transients in terms of the type l of stratification phenomena they are expected to produce [

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401 W 1980m 10 g 1

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b la.c.e This is considered to be a conservative representation  !

of what the transients would actually impose on the pipe.

6 In summary, the existing heatup and cooldown transients were replaced by a (

set of transients that were developed entirely from the monitoring data of j several plants (Comanche Peak Unit 1 monitoring data from HTT confirms ths l

conservatisms of the assumptions used.) The existing normal and upset transients were modif'.td to consider the effects of therani stratification. ,

As part of the modification process the existing normal and upset transients .

were(

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ERRATA l

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The following pages contained typographical errors. The corrections are shown j

• , with vertical lines on the right hand border. l 1

NOTE: The corrections provided here do not change any of the conclusions / l results of the original WCAP-12248 and Supplement 1. l h

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