ML20134G113

Addendum 1 to Repair of W Series 44 & 51 SG Tubes Using Leak Tight Sleeves, Final Rept

ML20134G113
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	01/27/1997
From:	ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY
To:
Shared Package
ML111960196	List: ML20134G065 ML20134G099 ML20134G113
References
CEN-629-NP-ADD, CEN-629-NP-ADD-01, CEN-629-NP-ADD-1, NUDOCS 9702100282
Download: ML20134G113 (20)

Text

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i CEN-629-NP l Addendum 1 i

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COMBUSTION ENGINEERING, INC.

January,1997 Reoair of l Westinghouse Series 44 and 51 Steam Generator Tubes i

Usinn Leak Ticht Sleeves i

I i FINAL REPORT  !

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i Combustion Engineering, Inc.

i Nuclear Operations

! Windsor, Connecticut i

i l 9702100282 970127 i PDR ADOCK 05000295 P PDR l

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I NON-PROPRIETARY 1

CEN-629-NP

! Addendum 1 1

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I COMBUSTION ENGINEERING,INC.

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! January,1997 4

1 Repair of i

i Westinghouse Series 44 and 51 1

Steam Generator T_ules  !

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i Usine Leak Tinht Sleeves i

I FINAL REPORT l 1 5 t e

i j Combustion Engineering, Inc.

j Nuclear Operations b

i Windsor, Connecticut i

1 9702100282 970127 PDR ADOCK 05000295 l P PDR 4

LEGAL NOTICE THIS REPORT WAS PREPARED AS AN ACCOUNT OF WORK SPONSORED BY ABB COMBUSTION ENGINEERING. NEITHER ABB COMBUSTION ENGINEERING NOR ANY PERSON ACTING ON ITS BEHALF:

A. MAKES ANY WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED INCLUDING THE WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY, WITH RESPECT TO THE ACCURACY, COMPLETENESS, OR USEFULNESS OF THE INFORMATION CONTAINED IN THIS REPORT, OR PROCESS DISCLOSED IN THIS REPORT MAY NOT INFRINGE PRIVATELY OWNED RIGHTS; OR B.

ASSUMES ANY LIABILITIES WITH RESPECT TO THE USE OR FOR DAMAGES RESULTING FROM THE USE OF, ANY INFORMATION, APPARATUS, METHOD OR PROCESS DISCLOSED IN THIS REPORT.

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ABSTRACT i

This addendum details the assessment of steam generator tube sleeves operating under conditions outside of the bounding values originally used to assess the adequacy of this repair >

for installation in Westinghouse designed Series 44 and 55 steam generators.

l The assessment contained herein verifies that the sleeves described in the original report  !

remains an acceptable repair technique for these steam generator tubes. -

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O O TABLE OF CONTENTS SECTION TITLE PAGE

1. INTRODUCTION 1 1.1 PURPOSE 1 i

1.2 BACKGROUND

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1.3 REFERENCES

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SUMMARY

AND CONCLUSIONS 1 i i

3. ACCEPTANCE CRITERIA 2

4. DESIGN DESCRIPTION OF SLEEVES AND INSTALLATION 2  ;

EQUIPMENT

5. SLEEVE EXAMINATION 2 5.1 ULTRASONIC EXAMINATION 2 5.2 EDDY CURRENT EXAMINATION 2

6. SLEEVE TUBE CORROSION TEST PROGRAM 3

7. MECHANICAL TESTS OF SLEEVED STEAM GENERATOR 3 TUBES

8. STRUCTURAL ANALYSIS 3 8.1

SUMMARY

AND CONCLUSIONS 3 l

8.2 LOADINGS CONSIDERED 6 8.3 EVALUATION FOR ALLOWABLE SLEEVE WALL 7 DEGRADATION USING REGULATORY GUIDE 1.121  ;

8.4 EFFECT OF TUBE LOCK-UP ON SLEEVE LOADING 8 8.5 SLEEVED TUBE VIBRATION CONSIDERATIONS 9 ii

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i TABLE OF CONTENTS (cont] ,

SECTION TITLE PAGE J

l 8.6 STRUCTURAL ANALYSIS FOR NORMAL OPERATION 10  !

9. SLEEVE INSTALLATION VERIFICATION 13

10. EFFECT OF SLEEVING ON OPERATION 13 t

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- 1. INTRODUCTION J i  ;

1.1 PURPOSE i

l The purpose of this addendum is to provide additional information to support a  ;

{ technical specification change allowing installation of repair sleeves in

] Westinghouse designed Series 44 and 51 steam generators that have made changes

in their operating parameters beyond those specified in Reference 1.3.1.

4 i 1.2 ' BACKGROUND

, As steam generators age, increased plugging limits result in operating parameters  ;

outside the bounds of the input parameters utilized in Reference 1.3.1. '

Additionally, changes in industry requirements that alter input parameters, i specifically MSLB conditions, have been incorporated. This addendum addresses j these changes and the resulting differences in sleeve loadings and stress levels associated with the sleeve / tube assembly.

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1.3 REFERENCES

I 1.3.1 CEN-629-P, Revision 01, Renair of Westinghouse Series 44 and 51 Steam i l Generator Tubes Usine Izak Tight Sleeves, Combustion Engineering Inc., i

! November 1996. l

i. 1.3.2 WCAP-14790, Zion Increased Steam Generator Tube Pinooing and Thermal Decion  !

Reduction AnalysisProgram '

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2. SUhBfARY AND CONCLUSIONS i 4

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The changes in operating parameters described in this addendum have only a minimal effect on the loads and stresses experienced by any of the sleeve or sleeve plug designs described in Reference 1.3.1. As such the safety factors described

, therein as described in the analysis and verified by the testing performed, still

, provide more than adequate margin against operating and faulted conditioer, i

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3. ACCEITANCE CRITERIA The conditions evaluated in conjunction with the design criteria contained in Reference 1.3.1 are as follows:

Primary Side: 596 F (operating) 2235 psig (operating) 650 F(design) 2500 psig (design)

Secondary Side 495 F (operating) 653 psig (operating) 550 F(design) 1085 psig (design) l l

1 Of the parameters described in Section 3.0 of Reference 1.3.1, only the operating conditions have been modified. Although included here for completeness, design parameters remain as described in the referenced report.

4. DESIGN DESCRIPTION OF SLEEVES AhT INSTALLATION l EQUIPMENT I

The changes in operating parameters described in Section 3 have no affect on the contents of this section of Reference 1.3.1.

5. SLEEVE EXAMINATION PROGRAM 5.1 ULTRASONIC INSPECTION The changes in operating parameters described in Section 3 have no affect on the contents of this section of Reference 1.3.1.

5.2 EDDY CURRENT EXAMINATION Based on the revised calculations performed in Section 8 for R.G.1.121 analysis, the eddy current testing acceptance criteria given in Section 5.2 of Reference 1.3.1 provides an adequate margin of 11.5 % (vs 12%) with respect to growth and ECT uncertainty.

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6. SLEEVE TUBE CORROSION TEST PROGRAM De changes in operating parameters described in Section 3 have no affect on the contents of this section of Reference 1.3.1.

7. MECHANICAL TESTS OF SLEEVED STEAM GENFRATOR TUBES The changes in operating parameters described in Section 3 have no affect on the contents of this section of Reference 1.3.1.

8. STRUCTURAL ANALYSIS OF SLFEVE-TUBE ASSEMBLY 8.1

SUMMARY

AND CONCLUSIONS Based on the analytical evaluation contained in this section and the mechanical test data contained in Reference 1.3.1, Section 7.0, it is concluded that the Full Depth

'Ibbesheet (FDTS) and the Tube Support (TS) sleeves described meet all the requirements stipulated in Section 3.0 and 8.0 with substantial margins. This addendum highlights the calculations affected by the operating and faulted condition parameter changes found in Section 3. of this Addendum. Calculations involving design conditions remain as described in Reference 1.3.1 Section 8.0.

Only the [ ] inch sleeve in the " worst" case envelopment which is not locked in the tube support will be discussed since it provided the most conservative results in Reference 1.3.1. As such the calculations in this addendum are more conservative or the same as those which would results from a complete analysis as presented in Reference 1.3.1 Section 8.0.

8.1.1 Design Sizing The changes in operating parameters described in Section 3 have no affect on the contents of this section of Reference 1.3.1.

8.1.2 Detailed Analysis Summary A summary of the detail analysis changes brought about by the changes in operating parameters and MSIE conditions is as described below and in Tables 8-1 and 8-2.

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O O FORMULAS FOR GENERAL MEMBRANE STRESSES SUMMARIZED IN TABLE 8-1 (Note: All SI equations below are a derivation of the formula in Par. NB-3324.1.)

1. GENERAL PRIMARY MEMBRANE STRESS (DESIGN TUBESHEET DELTA PEESSURE)

The changes in operating parameters described in Section 3 have no affect on the contents of this section of Reference 1.3.1.

3 MAIN STEAM LINE BREAK _

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3. PRIMARY PIPE BREAK (LOCA) l l

The changes in operating parameters described in Section 3 have no affect on the contents of this section of Reference 1.3.1.

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O O TABLE 8-1

SUMMARY

OF SLEEVE AND WELD ANALYSIS RESULTS .

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i TABLE 8-2 i

SUMMARY

OF LOWER JOINT (WELDED AND ROLLED) DESIGN. ANALYSIS AND TEST RESULTS i t

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8.2 LOADINGS CONSIDERED 8.2.1 Upper Sleeve Weld Pullout lead In the event of a main steam line break (MSLB), the pressure differential would be 2560 psi per NRC Generic Letter 95-05: " Voltage-Based Repair Criteria for Westinghouse Steam Generator Tubes Affected by Outside Diameter Stress Corrosion Cracking", Page 3 of Attachment I as applied to the Westinghouse Plants. Postulating a main steam line break (MSLB) accident, the maximum pullout load would be:

8.2.2 Lower Sleeve Rolled or Weld Section Pushout Imad I 1

I The changes in operating parameters described in Section 3 have no affect on the contents of this section of Reference 1.3.1 I

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8.2.3 Weld Fatigue ,

The contents of this paragraph in Reference 1.3.1 do not change.

8.3 EVALUATION FOR ALLOWABLE SLEEVE WALL DEGRADATION i USING REGULATORY GUIDE 1.121

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8.3.1 Normal Operation Safety Margin 1

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8.3.2 Postulated Pipe Rupture Accidents l

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8.3.3 Average Minimum Weld Height Requirements A change in the MSLB AP described in Section 8.2.1 affects the following calculation for minimum weld height I

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O O 8.4 EFFECT OF TUBE LOCK-UP ON SLEEVE LOADING

- l 8.4.1 Sleeved Tube in Operating Steam Generator , Free at Tube Support  !

This condition was not reanalyzed. i l

8.4.2 Sleeved Tube in " Worst" Case Envelopment, Free at Tube Support Axial Loads at the Tube Bundle Perioherv l

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O O 8.4.3 Sleeved Tube in Operating Steam Generator, Lock-up at First Tube Support This condition was not reanalyzed.

8.4.4 Sleeved Tube in " Worst" Case Envelopment, Lock-up at First Tube Support This condition was not reanalyzed.

8.4.5 Effect of Tube Prestress Prior to Sleeving The changes in operating parameters described in Section 3 have no affect on the contents of this section of Reference 1.3.1

-8.4.6 Lower Sleeve Rolled or Weld Section Pushout Due to Restrained Thennal Expansion i

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O O 8.5 SLEEVED TUBE VIBRATION CONSIDERATIONS The changes in operating parameters described in Section 3 have no affect on the contents of this section of Reference 1.3.1 8.6 - STRUCTURAL ANALYSIS FOR NORMAL OPERATION The changes in operating parameters result in increases in the cumulative usage factor for three of the four cases analyzed, however, none of these increases results in a usage factor greater than the allowed value of 1.0.

8.6.1 Fatigue Evaluation of Upper Sleeve / Tube Weld i

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- I 8.6.2 Evaluation of Lower Sleeve Rolled Section 1

The changes in operating parameters described in Section 3 have no affect on the contents of this section of Refemnce 1.3.1 8.6.3 Fatigue Evaluation of I.ower Stub Weld For the Lower Sleeve Weld (FDTS) summarized in Table 8-1, page 8-4, ofReference 1.3.1 Primary Local Stress:

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i 8.6.4 Fatigue Evaluation of Sleeved Tube Plug Weld l

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9. SLEEVE INSTALLATION VERIFICATION  !

The changes in operating parameters described in Section 3 have no affect on the contents of this section of Reference 1.3.1 i

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10. EFFECT OF SLEEVING ON OPERATION The changes in operating parameters described in Section 3 have no affect on the contents of this section of Reference 1.3.1 i

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