ML20070L885

Nonproprietary McGuire Unit 2 U-Bend Tube Fatigue Re-Evaluation

ML20070L885
Person / Time
Site:	Mcguire
Issue date:	10/31/1990
From:	Wootten M WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML19310E642	List: ML20070L869 ML20070L881 ML20070L885
References
NSD-RMW-90-0302, NSD-RMW-90-302, SG-90-09-037, SG-90-9-37, WCAP-12730, NUDOCS 9103200318
Download: ML20070L885 (17)

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WESTINGHOUSE CLASS 3 l WCAP-12730 NSD-RMW-90-0302 SG-90-09-037 l

l McGUIRE UNIT 2 U-BEND TUBE FATIGUE RE-EVALUATION OCTODER 1990 PREPARED TOR DUKE POWER COMPMfY APPROVED M. J. WOOTTEN, HANAGER b7EAM GENERATOR \ TECHNOLOGY AND ENGINEERING

\

i i

l l

s l i WESTINGHOUSE ELECTRIC CORPORATION NUCLEAR SERVICES DIVISION i i

P. O. BOX 355 PITTSBURGH, PENNSYLVANIA 15230 j Copyright by Westinghouse Electric 1990, - All Rights Reserved l

FOREWORD This nonproprietary report bears a Westinghouse copyright notice. The NRC is permitted to make the nunber of copies of this report necessary for its internal use and such additional copies which are necessary in order to have one copy available for public viewing in the appropriate docket files in the public document room in Washington, D.C. and in local public document rooms as nay be required by NRC regulations if the number of copies submitted is insufficient for this purpose. The NRC is not authorized to make copies for the personal use of members of the public who make use of the NRC public document rooms. Copies of this report or portions thereof made by the NRC must include the copyright notico.

1

1 Introduction The initial assessment f or McGuire 42 small radius tube f atigue 4 s perfo'ted in June, 1980 (Reference 1), and identified no tubes as requiring corrective action. Since the completion of that effort, Westinghouse has develo?et enhanced analytical tools for AVB insertion depth mapping. Westinghouse therefore initiated the re-analysis effort described herein eo incorporate t.he benefits of the enhanced analytical nethods and additiot.al flow peaking tests into the McGuire #2 analysis.

Eddy Current Data Interpretation and AVB Position Rapping In the original analysis, the McGuire #2 oddy current tapes were searched for signals indicating the presence of (

}a,C of the eddy current tapes was not requited.

The principal aspect of the McGuire 42 re-analysis was to differentiate Ja,c An additional distinction of the re-analysis from the " original" analysis, is that when (

Ja,c for each such tube.

The revised AVB insertion maps are shown in rigures 1-4. Note that Row B tubes are acceptable and not limiting for the flow peaking configurations observed at McGuire #2, and the flow peaking analyses of these tubes were generally perf ormed assuming [

Ja,c A description of the changes and analysis of AVB positioning in salient regions are described below:

EG-A

• AVB C8/9 was adjusted to ( Ja,e

• AVB C17/10 was adjusted to (

Ja,c 2

1 . . . . . . _ , _ . _ _ _ . -_ __ . - _ _ _ _ _ _ _ _ _ . _ _ _ . . _ - . _ _ _ _ __ - . _ . . _. . _ . - _ _ _ . _

r' 4

J

,

• AVB C42/43 was adjusted to ( Ja,c

• AVB C44/45 was adjusted to ( Ja,c

• AVB C76/77 was adjusted to ( )

Ja c e

• AVB C81/82 was conservatively adjusted to ( Ja,e since it could affect peaking for R8C64,

• AVB C83/84 was conservatively adjusted to ( la,e

• AVB C64/85 was adjusted to (

and correlation of long 1-AVB signal in RBC64 with 2nd and 3rd signals in ja,C Two tubes for which (

Ja,e in SG-A are R9C18 and R9c23. The projection value from R10C10 was ( la,c, however, projection values in 1 3a,e Based upon the correlation of (

Ja,c The evaluated minimum insertion depth of AVB C23/24 is (

Ja,c

^

LG-D

• AVB C46/47 was adjusted to [ la,c

• AVB C68/69 was conservatively adjusted to (

• Ja,c AVB C82/83 was adjusted to (

ja,C

• AVB C83/84 was adjusted to [ la,c

• AVB C84/85 was adjusted to (

Ja,C

• AVB C92/93 was adjusted to ( Ja,c  ;

Three tubes for which ( '

}a,c in SG-B are R9C33, R9C88 and R9C92. R9033 may be supported based upon the R10C33 projection of (

Ja,c AVB C87/88 is projected to (

Ja,c AVB C92/93 is conservatively evaluated as beit) inserted to a - (

Ja,c ASIC

• AVB C14/15 was conservatively adjusted to (

Ja,c

• 1.VB C17/18 was adjusted to ( Ja,c l L

• Fill patterns for R8C62-66 were corrected to indicate that the EC tapes for these tubes were not evaluated for AVB signals.

3

.~ _.. _ _ _ _ _.

Two tubes for which (

Ja,c in sG.C are R9022 and R9C93. AVD C21/22, near R9C22 was conservatively evaluated te have a minimum insertion depth of 1 Ja,c AVB C22/23 was evaluated to have a minimum insertion depth of [

ja,c All AVDs near R9C93 were conservatively positioned, beginning with AVD C91/92 at 9.25. "2nd AVB" data from (

Ja,e aVB C93/94 was positioned at the (

Ja,c M.

• AVB C4/5 was adjusted to [ Ja,c

• The projection value for C5 was changed to I Ja,C

• AVB C6/7 was adjusted to ( Ja,c

• AVB C92/93 was conservatively adjusted to !

Ja,c

• AVB C93/94 was conservatively adjusted to (

ja,C

• AVD C106/107 was adjusted to ( Ja,e Two tubes in $0-D fot which (

Ja,e A conservative [

ja,c Flow Peaking Analysis riow peaking factors for McGuire Unit 2 were analyzed using the methodology duscribed in Section 0 of Reference 1. Table I summarires the results of peaking factors. The AVB positions of each insertion pattern in Figure $

should be carefully noted. Where the AVDs are shown at the top of the instrumented tuba [ 18,c, the AVas at least partially blocks the flow past the instrumented tube and low flow peaking factors are typically obtained. Where the AVDs are shown at the centerline of the tube row tbove the instrumented tube, the flow past the instrumented tube is not restricted and significant flow peaking can be obtained.

In applying the methodology to McGuire 2, maps of the AVB insertion depths shown in Figures 1 through 4 were first reviewed. The second step was to identify the locations where flow peaking might occur. In doing eN maximum allowable flow peaking factors were also reviewed column by col.an ir rows 8 through 12. Fj gure 6 provides the maximum allowable flow peaking w;io for the Me. Guiro 2 tube vibration analysis. According to rigure 6, flow peaking factore greater than [ Ja,e for row 8 and ( Ja,c for row 9 tubes would be required f or tube f atigue to be a concern. Note that a peaking factor of

( J a,c is higher than the highest peaking f actor of ( Ja,c among the results of flow peaking tests. The maximum allowable flow peaking factors for row 7 tubes wi41 be even higher than [ Ja,c, 4

__. ____. _ ____ _ ____ _ ____.- _m.____ _ ..- _ _ _ -

a P J

l 1 i Afth conservative ostimates of peaking f actors were made f or specific tubes, y those having peaking factors near the maximum allowable value were identilled I

and AVD insertion depth positioning was reviewed for the tube being analyred and its neighboring tubes. If tmeded, the stability velocity for the tube was

! determined in the Cantilever Tube Air Model at the Westinghouse Science and Technology Center ($7C) using the AVB insertion dept.h pattern associated wrth the potentially flow-peaked tube. The peaking f actor was t. hen calculated 3

using the stability velocity. The AVD insertion patterne relevant to McGuire

1. 2 which have been testod in the STC Model are shown in Figure $, along with  ;

their associated flow peaking factors. A detailed descrjption of flow peaking iactora is given f or each steam generator in the f ollowing:  ;

• iteam cenerater A The following table gives the peakinu f actors f or SG-A tubes with unique configurations of AVD insertion depths.

Steam Type of AVB reaking Generator Row No Column No Insertion Depth Factor j- - ,

. a,e A 7  !

g ,

9 i

For R7CD8, type [ Ja,e was selected and a peaking factor cf ( Ja,c resulted. Type ( Ja,C was a conservative choice for tubes RBC79, R8C7$ and RBC27 and a peaking factor of ( Ja,c applied to them. Tube R9C23 was bounded by type [ Jhe o, which leads to a peaking factor of I Ja,0 Typo ,

1 la,c was conservative for R9C1B tube and a peaking factor of ( Ja,c i resulted.

Eteam Generator M Tubes in SG-B with. unique AVB configurations are listed together with their ,

peaking factors.

Steam Type of AVB Peaking Generator Row No Column No insortion Depth Factor

. . a,c B 8 9

For RBC88, type [ Ja,c was a conservative selection to yield a peaking factor 5 ,

i .

of ( Ja,c. For Row 8 Columns 79 and 78, type [ la,e was considered and a j peaking factor of ( Ja,e was obtained. . Type ( Ja,c was a conservative

! choice for R9C92 tube and a peaking factor of ( Ja,c resulted. Type ,

( Ja,c was very conservative for R9C88 tube and a peaking factor of ( Ja,e l was obtained. R9C69 belonged to type ( la,c, which gives a peaking factor of i

( Ja,c,. Type [ ja,e was a very conservative choice for R9C33 tube and a peaking factor of ( _)a,c was selected.-

4 rteam cenerater c The following table presents results of peaking factors for SG-C tubes.

Steam Type of AVB Peaking i Generator Row No Column No Insertion Depth Factor

,, , a,c C 8 i

9 Type [ la,c was selected for tube R8C93 where we considered that the AVB I between columns 90 and 91 was positioned at row 7. Such a position would affect the RBC93 tube more than its actual position st row 5. This.AVB at its row $ position is far upstream compared to its neighboring AVBS,. flow perturbation due to this AVB would be dissipated well before it reaching RBC93. Flow perturbation due to a row 7 position would reinforce with the perturbation due to the AVB between columns 91 and 92, and significantly affect the RBC93 peaking. Type ( Ja,c was thus a conservative choice for R8C93 and a peaking factor of ( J a, c resulted.

For RSC84, type [ la,C was a very conservative _ choice and a peaking factor of

( Ja,c ~was obtained.- Both tubes R8C54 and RBC40 belonged to type ( Ja,c '

and a peaking factor of [ Ja,c-resulted. Type ( Ja,c was selected for RBC22 and a peaking factor of ( }a,c appeared. 'RBC9 belonged to type

[ ja,c, which yields a peaking factor of ( Ja,c, For R9C93 tube, the AVB between colunma 90 and 91- was positioned at Row 8. As described for R8C93, such a position is conservative compared to-its actual position at Row 5. The assumed position led to a consideration of type

! -Ja,c and a peaking factor of ( Ja,c resulted. .For R9C22, the_AVDs behind it come at-least to the top of the tube, such positions effectively impede the incoming flow perturbation and flow peaking would not be expected.

, Thus type ! Ja,c was a good.cholce and a peaking factor of ( Ja,c resulted.

6

p

• k a ,

s ',

Atamm Generator D i

The following table presents results of peaking factors determined for SG-D ,

tubes'with unique AVB configurations. l Stean Type of AVD Peaking Generator Row No Column No Insertion Depth Factor

• a,C +

D 8 9

R8C92 belonged to type [ Ja,c and a peaking factor of ( Ja,c resulted.  ;

Type -l la,c. was a consel:vative selection for R8C23 and a peaking f actor of

[ Ja,c.was obtained.- R9C107 was represented by type [ Ja,e and a peaking factor of ( la,c was selected. For R9C54, type (- Ja,c was selected to  ;

'yloid a peaking factor of ( Ja,c. For R9C7, type ( la,c was a -

conservative selection.to yield a peaking factor of ( le sC.

- Allowable and &ctual Flow Peaking Ration .

The analytical methods used to= evaluate the susceptibility to vibration induced _

fatigue of the small radius U-bend tubes are the same as those used in the original

. analysis (Reference ), and the detailed description of the nethods will-not be

' repeated here. ' Allowable _ flow peaking ratios determined in the original analysis

• are shown-as a function of row and column number in Figure 6. This figure was developed for McGuire.fi,.McGuire #2, and Catawba el cases, and is also seen in the Catawba #1 report (Reference 2) as Figure 9-8. A peaking ratio is_the peaking

' factor divided by.the peaking factor for North Anna R9C51, and the allowable peaking ratio is the peaking ratio which causes the stress ratio to be unity after >

. operation.over-the design basis period. j t

TA summary of the flow peaking-factors obtained in the McGuire #2 re-analysis is shown.in Table l'along with the type-of.AVB insertion pattern attributed to'each .

tube with a'_ peaking factor greater than 1.0.' Table 1 also lists the.ficw peaking l

' ratio'and allowable flow peaking ratio.for each tube. The maximum allowable peaking ratio is also given in the.last colunn of Table 1 for the tubes included'in that' table.

Conclusions Inspection of the last two columns of Table 1;shows that no tubes have peaking 3

-ratios large enough.to cause the stress ratio to be greater than unity. Thus, the j tubes-in the McGuire #2 steam generators are not-expected to be susceptible to ,

high-cycle f atigue rupture at' the top tube support plate in a manner similar to- the Lrupture.which occurred at North Anna Unit #1, assuming operation of the planti through.the end of the operating license at full power steam pressures above 1007 psia..

E 7 7

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l References

1. McGuire Unit 2 Evaluation for Tube Vibration Induced ratigue, WOAP-11935, August, 1988. l

2. Catawba Unit 1 Evaluation for Tube vibration Induced ratigue, WCAr-12125, February, 1989.

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Figure 2 McGuire #2 Steam Generator B AVB Positions (Rev. 1) 10

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Figure 3 McGuire #2 Steam Generator C AVB Positions (Rev. 1) 11

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0 s

t i

TYPE OF AVD PEAKING TYPE OF AVO PEAKING INSERTION FACTOR INSERTION FACTOR

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FIGURE $

FLOW PEAKING FACTORS FOR McGUIRE f2 s

13

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4 i

1

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Table 1 'I Stability VeJocity Peaking. Factors for Specific Tubes for McGuire Unit 2 )

U-Bend Fatigue Re- Analysis j i

1 Allowable Steam Type of AVB Peaking Peaking Peaking )

Generator Row No Column No Insertion Factor Ratio Ratio- .

a,e -

A 7 88 )

8 79 75 ,

27  !-

9 23 18

'i B 8 88 79, 78 9 92 ,

88 69 33 {

c 8 93 84 54

-40 22 17 9

9 93

-22 D 8 92 23 t 9 107 54 7

9 15

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