L-2003-222, Attachment 4, Calculation Note CN-CI-02-56 Rev. 00 Section XI Flaw Evaluation of Florida Power and Light Units 1& 2 Hot Leg Instrumentation Nozzles - J Weld

Attachment 4, Calculation Note CN-CI-02-56 Rev. 00 Section XI Flaw Evaluation of Florida Power and Light Units 1& 2 Hot Leg Instrumentation Nozzles - J Weld

ML033000139
Person / Time
Site:	Saint Lucie
Issue date:	09/06/2002
From:	Ghergurovich J, Hammel T, Hinton B, Colleen Schmidt, Watson R Westinghouse
To:	Office of Nuclear Reactor Regulation
References
L-2003-222 CN-CI-02-56-NP
Download: ML033000139 (8)

Text

St. Lucie Unit I Docket No. 50-335 L-2003-222 Attachment 2 Page 1 Westinghouse Electric Company LLC Calculation Note CN-CI-02-56 Rev. 00 Section Xl Flaw Evaluation of Florida Power and Light Units I & 2 Hot Leg Instrumentation Nozzles - J Weld (Non-Proprietary Version)

(7 Pages)

Calculation Note CN-CI-02-56 Rev. 00 Section Xl Flaw Evaluation of Florida Power and Light Units I & 2 Hot Leg Instrumentation Nozzles - J Weld (Proprietary Version)

(180 Pages)

Attachments 3 and 4 Contain 10 CFR 2.790 Information

I Westinghouse Non-Proprietary Class 3 WESTINGHOUSE ELECTF1IC COMPANY LLC I

Title:

Section Xl Flaw Evaluation of Florida Power and Light Units I and 2 Hot Leg Instrunentation Nozzles J-Weld Authomri) Name(s)

R. S. Watson C.R Schmidt J. Gherpurmich Verfier(s) Name(a)

T.D. Haammet Signatre I Date r

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Table Of Contents 1.0 Introduction..........................

5 1.1 Background J Purpose.....................................

1.2 LImits of Applicability..................

2.0 Summary of Results and Conclusions................

6 2.1 Maximum Allowable Flaw Size..................

2.2 Normal and Upset Conditions..........................................................................................

2.3 Emergency and Faulted Conditions.................................................................................

2.4 Prlrmary Stresses.............................................................................................................

3.0 Assumptions and Open Items

.......................6 3.1 Discussion of Major AssumptIons....................................................................................

3.2 Open Items....................................................................................................................

4.0 Acceptance Cteria.

6 5.0 Computer Codes Used In Calculation...............................

6 6.0 Calculations.............................

6 6.1 Method Discussion...........................................................................................................

6.1.1 ASME CODE ANALYTICAL PROCEDURE..........................................................

6.1.2 EXPECTED END-OF-LIFE FLAW SIZE...............................................................

6.1.3 MAXIMUM ALLOWABLE FLAW SIZE..................................................................

62 Input.................................................................................................................................

6.2.1 NOZZLE GEOMETRIES......................................................................................

62.2 LOADING COND4TIONS, TRANSIENTS AND CYCLES......................................

6.2.3 MATERIAL PROPERTIES....................................................................................

6.3 Evaluations, Analysis, Detailed Calculations and Results................................................

6.3.1 CONFIGURATION OF ANALYZED FLAW..........................................................

6.3.2 COMPONENT STRESSES.......................

6.3.2.1 Pressure stress....................................................................................

6.3.2.2 Thermal stress.....

6.3.22 Thrmal stres......................................................................................

6.3.2.3 Residual Stress Considerations.

6.3.3 STRESS INTENSIFICATION FACTOR, K,...........................................................

6.3.4 CALCULATION OF FATIGUE CRACK GROWTH.............................................

6.3.5 EMERGENCY AND FAULTED CONDITIONS.

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6.3.6 PRIMARY STRESS CRITERIA..........................

7.0 References...........

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l 1.0 Introduction 1.1 Background I Purpose Typical small-bore nozzles are fabricated from Alloy 600 material and are attached to the piping and vessels with 82/182-weld material. This material Is subject to Pressurized Water Stress Corrosion cracking (PWSCC) and often results In cracks and leaks in these nozzle assemblies. Identified nozzle leaks must be addressed and several techniques are available such as Mechanical Nozzle Seal Assemblies (MNSAs) and half-nozzle repairs. The nature of these repairs Is such that it is convenient to leave the crack In place, if it can be demonstrated that the crack and any potential future growth of the crack Is acceptable.

The objective of this calculation Is to present the results of an ASME Code Section Xi Appendix A flaw evaluation for the Alloy 600 small bore nozzle J-welds in the Hot Leg piping of St. Lucia Units i & 2. This evaluation considers an assumed double-sided crack that has propagated through the J-Weld and Is beginning to encroach on the carbon steel material that comprises the pressure boundary. Since the Intent Is to not repair this flaw If found, the flaw configuration must be evaluated In accordance with ASME Code Section Xi to demonstrate continued integrity of the pressure boundary during plant operation for the postulated plant life.

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iei6 Inwormaimon Tor bec16O 171 Z.u - Z.A is propriewry TO vwvviinouse viecuui. c 3.0 Assumptions and Open Items Information for Sections 3.0 - 3.1 is proprietary to Westinghouse Electri.

4.0 Acceptance Criteria Information for Section 4.0 is proprietary to Westinghouse Electric.

5.0 Computer Codes Used In Calculation Information for Section 5.0 Is proprietary to Westinghouse Electric.

6.0 Calculations Information for Sections 6.0 - 6.3 Is proprietary to Westinghouse Electric.

7.0 References

1. [

1

2.

ASME Boiler and Pressure Vessel Code, Section Xi, 1989 edition.

3.

[

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4.

i

5.

British Standards Institute, BS 7910-1999 incorporating Amendment 1, Guide on Methods for Assessing the Acceptabillty of Flaws hI Metallic Structures, October 2000.

6.

[

I

7.

Theory of Elastidtv, third edition, S.P. Timoshenko, McGraw-HIll, Inc.

8.

Letter LTR-SST-01-94 to ANSYS Users from Michael J. Fisher of Systems and Software Technology, Release of ANSYS 5.7.1 on NT 4.0, HPUX 11 & Solarls 2.8,' 10/5/01

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[

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10.

Mathcad 20011, Professional

11. 1 J

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13. W.H, Bamford and A.J. Bush, Effect of Cladding on Fracture Analysis. ASME Pressure Vessel and Piping, Fatigue, Environmental Factors, and New Materials, Vol. 374 pp. 47-59, 1998.

14.

Warren C. Young, Roark's Formulas for Stress and Strain Sixth Edition

15. [

]

16.

[

17. J. C. Newman Jr. and 1. S. RaJu, Stress Intensity Factor Equations for Cracks In Three-Dimensional Bodies Subjected to Tension and Bending Loads, NASA Technical Memorandum 85793. April 1984.

18.

RIgo Perez, Alten F. Grandt Jr., and Charles R. SafF, *Tabulated Stress-Intensity Factors for Corner Cracks at Holes Under Stress Gradients pp. 49-62 of ASTM STP1060, Surface-Crack Growth: Models, Experiments and Structures.

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