ML20045B718

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Nonproprietary WCAP-12142,Rev 1, Beaver Valley ,Unit 2 88-02 Re-Evaluation for Tube Vibration Induced Fatigue
ML20045B718
Person / Time
Site: Beaver Valley
Issue date: 04/30/1993
From: Pitterle T, Renee Taylor
WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML19303F620 List:
References
WCAP-12142, WCAP-12142-R01, WCAP-12142-R1, NUDOCS 9306180341
Download: ML20045B718 (10)
v • d • e


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WESTINGHOUSE CLASS 3 WCAP-12142, Rev.1 BEAVER VALLEY UNIT 2

)

"88-02" RE-EVALUATION i

FOR TUBE VIBRATION i

INDUCED FATIGUE

" APRIL 1993"

/

Verified by:

Verified by: [ 4. O o

R. Taylor T. A. Pitterle

Engineer, Consulting Engineer, Steam Generator.

Steam Genemtor Technology & Engineering Technology & Engineering This document contains material that is proprietary to the Westinghouse Electric Corporation.

This document is submitted in confidence, and is to be used solely for the purpose for which it is furnished, and is to be returned upon request. This document and such information is not to be reproduced, transmitted, disclosed, or used otherwise, in whole or in part, without prior written authorization of Westinghouse Electric Colporation.

Westinghouse Electric Corporation Nuclear and Advanced Technology Division P.O. Box 355 Pittsburgh, Pennsylvania 15230 (C) 1993 Westinghouse Electric Corporation All Rights Resen>ed

"88-02" Re-Evaluation for Tube Vibration Induced Fatigue Ref W. J. Johnson letter NS-NRC-90-3498, "... Tube Fatigue Evaluations Update", March 27,1990 WCAP-12141, WCAP-12142 " Beaver Valley Unit 2 Evaluation for Vibration Induced Tube Fatigue", February 1989 j

I Beaver Valley Unit 2 has been listed as a " category 6" plant in the referenced letter, requiring re-evaluation of EC data and the flow peaking interpretation of the same.

Published in Febmary of 1989, the tube fatigue evaluation for Beaver Valley Unit 2 occurred during the tmnsition to the most recent eddy current interpretation of [

l 1

a, c The AVB maps for Beaver Valley Unit 2 were reviewed to evaluate the possibility that the more recent interpretation of AVB signals would lead to different AVB placement (and flow

)

peaking results) than were given in the original WCAP reports. In the evaluation process, detailed AVB signal maps were made for approximately 1250 of the 1850 tubes originally considered, and the eddy current evaluation was repeated for 155 tubes.

The revised AVB placement maps are attached as Figures 1 through 3. Flow peaking results are provided in Figure 4 and in Table 1. Stress ratio values are summarized in Table 2.

Relative stability ratio times flow peaking is plotted in Figure 5. These figures and tables supersede those originally supplied as a pan of the referenced WCAP repons.

Typical of the increased emphasis on [

]'

  • Flow peaking for the unsupponed tubes in Row 7 is not a concern, as verified in Tables I and 2 and in Figure 5; therefore, the Row 7 tubes remain acceptable for continued service.

Some increases in flow peaking have been identified however, most notable in Row 9 Column 84 of SG 'A', Row 8 Column 69 of SG 'C', and Row 9 Column 84 of SG 'C'. Of these tubes, the calculated fatigue usage factor exceeds 1.0 for Row 9 Column 84 of SG 'A' and Row 9 Column 84 of SG 'C'. Two tubes previously identified in the referenced WCAPs as being susceptible to U-bend fatigue, Row 9 Column 33 and Row 1I Column 4 of SG 'C',

were recalculated and continue to have fatigue usage values of greater than 1.0. The fatigue usage for Row 11 Column 4 of SG 'C' remains above 1.0 despite a decrease in flow peaking from the value reponed in the referenced WCAPs.

]

I The resulting conclusion is that four tubes in Beaver Valley Unit 2 are potentially susceptible to U-bend fatigue and require corrective action. Two of these tubes, Row 9 Column 33 and Row 11 Column 4 of SG 'C' were pmviously identified for corrective action in the referenced WCAPs. Additionally, Row 9 Column 84 of SG 'A' and Row 9 Column 84 of SG 'C' require pmventive action based on the re-evaluation which was performed. All other

'l tubes remain acceptable for continued service.

l The evaluation documented herein is based on the full power operating conditions of 3,870,000 #/hr. steam flow at 811 psig, used as analytical input to the referenced 'WCAP' j

repons. Operation at a lower pressure or a higher power level may make these tube fatigue assessments nonconservative, and would require additional tube fatigue analysis.

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TYPE CF AVB PEAK!NG TYPE OF AVB PEAKING TYPE OF AVB PEAK!NG INSERTICN FACTCR INSERTICN FACTOR INSERT'CN FACTCR

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d Table 1 Flow Peaking Factors for Beaver Valley Unit 2 8

! STRESS RATIOS S/G i ROW -COLUM FLOW 'M AX ALLOW ! RSR*FP ! W/ DENTING W/O DENTING 4

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( )* - An axisymetric model (with symetry about C47/C48) is used. The ' mirror incage' tube has been analyzed.

Table 2 Stress Ratios for Beaver Valley Unit 2 9

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