ML20045B713
| ML20045B713 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 04/30/1992 |
| From: | Pitterle T, Yant H WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | |
| Shared Package | |
| ML19303F620 | List: |
| References | |
| WCAP-13350, NUDOCS 9306180331 | |
| Download: ML20045B713 (12) | |
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WESTlNGHOUSE CLASS 3 WCAP-13350 4
BEAVER VALLEY UNIT 1 "88-02" RE-EVALUATION FOR VIBRATION INDUCED STEAM GENERATOR TUBE FATIGUE APRIL 1992 Verified by:
bM Verified by: Id ODa H. W. 7 apt T. A. Pitterle Engine W, Consulting Engineer, Steam Generator Steam Generator Technology and Engineering Technology and Engineering-l i
l l
. Westinghouse Electric Corporation Nuclear and Advanced Technology Division P. O. Box 355 Pittsburgh, Pennsylvania 15230 (C) 1992 Westinghouse Electric Corporation All Rights Reserved i
I I
"88-02" Re-evaluation of Beaver Valley Unit 1 SG's Ref: W.
J.
Johnson ltr. NS-NRC-90-3498,
.. Tube Fatigue Evaluations Update", March 27, 1990 WCAP-11799, WCAP-18800 " Beaver Valley Unit 1 Evaluation for Vibration Induced Tube Fatigue", April 1988 j
1 Beaver Valley Unit 1 has been listed as a " category 6" plant in the referenced letter, requiring re-evaluation of the eddy current test data and the flow peaking interpretation of the same.
The re-evaluation process has been completed, with the conclusion that four tubes in SG A and two additional tubes in SG C require action; and four tubes previously plugged in SG C may be returned to service.
Published in April of 1988, the Tube Fatigue Evaluation performed.
for Beaver Valley Unit 1 preceded the mos* recent eddy current interpretation of [
]
The AVB data for Beaver Valley Unit 1 has been reviewed to evaluate the possibility that the more recent methods would lead to different AVB placement (and flow peaking results) than were given in the original WCAP reports.
In this review process, detailed AVB signal maps have been made for approximately 650 of the 1850 tubes originally considered, and the eddy current evaluation has been repeated for approximately 300 tubes.
The interpretation of AVB positioning when [
J
In the Beaver Valley Unit 1 SG's, this condition occurred most often in the proximity of Columns 35 and 60, and resulted in several additional tubes in SG's A and C being identified as " unsupported".
The revised AVB placement maps are attached as Figures 1 thru 3.
Examples of the results of the updated AVB mapping technique are the relocation of the AVB's shared by columns 34, 35, and 36 in SG A.
A large scale map of this region is shown in Figure 4.
Reevaluation of the EC data for this region resulted in the
" withdrawal" of both AVB's and produced an increase in flow peaking for the unsupported tubes R10C35 and R11C35 to the unacceptable values indicated in Table 1 and Table 2.
Conversely, in SG C, reevaluation resulted in the " withdrawal" of the AVB shared by columns 48 and 49, and " insertion" of the AVB shared by columns 50 and 51.
The net result was increased support for tubes R12C51, R10C60, and reduced flow peaking for tubes R11C51 and R11C52.
(See Figure 5)
All four of these tubes may be returned to service.
The flow peaking models used are shown pictorially in Figure 6, and flow peaking interpretation in Table 1.
The resulting stress ratio values are listed in Table 2 and the stress ratio plots in Figure 7.
These figures and tables supersede those originally supplied as a part of the "WCAP" reports.
In conclusion, in SG A, tubes R10C43, R9C60, R10C35 and R11C35 require action.
In SG C, in addition to the previously identified R11C47, tubes R9C60 and R11C53 require action.
Also in SG C, tubes R10C60, R11C51, R11C52, and R12C51 may be returned to service.
All other tubes identified as being unsupported are.
judged to have acceptable flow peaking values.
The evaluation documented herein is based on the full power operating conditions of 3,900,000 #/hr steam flow at 837 psia, used as analytical input to the referenced "WCAP" reports.
Operation at a lower pressure or a higher power level may make these tube fatigue assessments non-conservative and would require additional tube fatigue analysis.
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TYPE OF AVB PEAKING TYPE OF AVB PEAKING TYPE OF AVB PEAXING INSERTION FACTOR INSERTON FACTOR INSERTON FACTOR 3,b, c.
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Figure 6 Flow Peaking Models 8
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l Figure 7 Beaver Valley Unit 1 Plots of Stress Ratio 9
4
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A 8
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Table ~l Velocity Peaking Factors and Peaking Ratios for Beaver Valley Unit 1 U-bend Flow 10 J
S.O ROW COL F.P
' ALLOW RSR*FP STRESS RATIOS F.P
,Oc W/ DENTING W/O DENTING A 8 31 0.581 0.11 0.10 30 0.580 0.11 0.10 9
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9 60(35) 0.628 0.14 1
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8 66(29) 0.676 0.25 1
0.23
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0.06 i
i 43 5 0.750 0.44 i
0.41 I
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i i10 153(42) 0.893 0.81 i
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( )* - An axisymetric model (with symetry about C47/C48) is used. The ' mirror immage' tube has been analyzed.
Table 2 Stress Ratios for Beaver Valley Unit 1 11
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