NUREG/CP-0151 ORNL/TM-13187 Proceedings of the — IAEA Specialists' Meeting on Cracking in LWR RPV Head Penetrations Held at ASTM Headquarters Philadelphia, Pennsylvania May 2-3, 1995 U.S. Nuclear Regulatory Commission Office of Nuclear Regulatory Research Proceedings prepared by Oak Ridge National Laboratory rf DSffi&mON OF.THIS DOCUH/BJT !S UMLMt® \ AVAILABILITY NOTICE Availability of Reference Materials Cited in NRC Publications Most documents cited in NRC publications will be available from one of the following sources: 1. The NRC Public Document Room, 2120 L Street, NW., Lower Level, Washington, DC 20555-0001 2. The Superintendent of Documents, U.S. Government Printing Office, P. O. Box 37082, Washington, DC 20402-9328 3. The National Technical Information Service, Springfield, VA 22161-0002 Although the listing that follows represents the majority of documents cited in NRC publications, it Is not in- tended to be exhaustive. Referenced documents available for inspection and copying for a fee from the NRC Public Document Room Include NRC correspondence and internal NRC memoranda; NRC bulletins, circulars, information notices, in- spection and Investigation notices; licensee event reports; vendor reports and correspondence; Commission papers; and applicant and licensee documents and correspondence. The following documents in the NUREG series are available for purchase from the Government Printing Office: formal NRC staff and contractor reports, NRC-sponsored conference proceedings, international agreement reports, grantee reports, and NRC booklets and brochures. Also available are regulatory guides, NRC regula- tions in the Code of Federal Regulations, and Nuclear Regulatory Commission Issuances. Documents available from the National Technical Information Service Include NUREG-series reports and tech- nical reports prepared by other Federal agencies and reports prepared by the Atomic Energy Commission, forerunner agency to the Nuclear Regulatory Commission. Documents available from public and special technical libraries Include all open literature items, such as books, Journal articles, and transactions. Federal Register notices. Federal and State legislation, and congressional reports can usually be obtained from these libraries. Documents such as theses, dissertations, foreign reports and translations, and non-NRC conference pro- ceedings are available for purchase from the organization sponsoring the publication cited. Single copies of NRC draft reports are available free, to the extent of supply, upon written request to the Office of Administration, Distribution and Mail Services Section, U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001. Copies of Industry codes and standards used in a substantive manner in the NRC regulatory process are main- tained at the NRC Library, Two White Flint North, 11545 Rockville Pike, Rockville, MD 20852-2738, for use by the public. Codes and standards are usually copyrighted and may be purchased from the originating organiza- tion or, If they are American National Standards, from the American National Standards Institute, 1430 Broad- way, New York, NY 10018-3308. DISCLAIMER NOTICE Where the papers in these proceedings have been authored by contractors of the United States Government, neitherthe United States Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for any third party's use, or the results of such use, of any information, apparatus, product, or process disclosed in these proceedings, or represents that its use by such third party would not infringe privately owned rights. The views expressed in these pro- ceedings are not necessarily those of the U.S. Nuclear Regulatory Commission. NUREG/CP-0151 ORNL/TM-13187 Proceedings of the IAEA Specialists' Meeting on Cracking in LWR RPV Head Penetrations Held at ASTM Headquarters Philadelphia, Pennsylvania May 2-3,1995 Manuscript Completed: February 1996 Date Published: July 1996 Compiled by C. E. Pugh, S. J. Raney Oak Ridge National Laboratory Managed by Lockheed Martin Energy Research Corp. Oak Ridge, TN 37831-8063 M. G. Vassilaros, NRC Project Manager Division of Engineering Technology Office of Nuclear Regulatory Research U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 NRC Job Code B5703 ****** ~$l5t has tern repro- duce Item Che feest available wpy. ABSTRACT This report contains 17 papers that were presented in four sessions at the IAEA Specialists' meeting on Cracking in LWR RPV Head Penetrations held at ASTM Headquarters in Philadelphia on May 2-3,1995. The papers are compiled here in the order that presentations were made in the sessions, and they relate to operational observations, inspection techniques, analytical modeling, and regulatory control. The goal of the meeting was to allow international experts to review experience in the field of ensuring adequate performance of reactor pressure vessel (RPV) heads and penetrations. The emphasis was to allow a better understanding of RPV material behavior, to provide guidance supporting reliability and adequate performance, and to assist in defining directions for further investigations. The international nature of the meeting is illustrated by the fact that papers were presented by researchers from 10 countries. There were technical experts present from other countries who participated in discussions of the results presented. The IAEA issued a Working Material version of the meeting papersr(IAEA"IWG_-LMNPPr95/l), and this present documentincorporates the final versionof th£pg)ers as received from the authors. The final chapter includes conclusionsand recommendations. in DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or use- fulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any spe- cific commercial product, process, or service by trade name, trademark, manufac- turer, or otherwise does not necessarily constitute or imply its endorsement, recom- mendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best available original document. PROCEEDINGS OF THE IAEA SPECIALISTS' MEETING ON CRACKING IN LWR RPV HEAD PENETRATIONS May 2-3,1995 TABLE OF CONTENTS ABSTRACT iii FOREWORD vii LIST OF ATTENDEES ix ACKNOWLEDGMENTS xi Opening Comments and Addresses IAEA IWG on Life Management of Nuclear Power Plants 1 L. Ianko (IAEA) Co-Chairman Opening Address 2 L. M. Davies (IWG Chairman) Co-Chairman Opening Address 15 J. R. Strosnider (U. S. Nuclear Regulatory Commission) SESSION I. Chairmen: L. M. Davies and C. E. Pugh Activities of IAEA International Working Group on Life Management of Nuclear Power Plants .... 21 L. Ianko (IAEA, Austria) Spanish RPV Head Penetrations - Regulatory Status 61 J. M. Figueras (Consejo De Securidad Nuclear, Spain) Primary Waster Stress Corrosion Cracking of Alloy 600 83 R. Hermann, et. al. (U. S. Nuclear Regulatory Commission, USA) SESSION II. Chairmen: M. B. McNeil and T. Takahashi The Alloy 600 Head Penetration Issue: Past Efforts and Future Plans 87 W. H. Bamford (Westinghouse Electric Corporation, USA) Alloy 600 Head Penetration Cracking at EdF: Short- and Long-Term Maintenance Strategy 123 B. P. Siouffi, et al. (Electricite de France - UTO, France) Accelerated Steam Plus Hydrogen Tests for Alloy 600 Wrought and Welded Specimens 131 W. C. Kroenke, et al. (Bettis Laboratory, Westinghouse Electric Corporation, USA) Effects of Grain Boundary Structures on Stress Corrosion Cracking of Face Centered Cubic Alloys and Implications for Cracking of Nickel Alloy Pressurized Water Reactor Components 143 K. Aust et al. (University of Toronto, Canada) Licensing Experience on the Issue of Cracking in LWR RPV Penetrations 145 Y.W. Park (KINS, Korea) SESSION m. Chairmen J. R. Strosnider and M. Brumovsky ISI of RPV Heads of WWER Reactors '. 153 D. Corak (INETEC, Croatia) CRDM Nozzle Inspection/Repair 175 K. W. Fleming and S. Fyfitch (B&W Nuclear Technologies, USA) Residual and Operating Stresses in Welded Alloy 600 Nozzles 187 S. Hunt and D. Gross (Dominion Engineering) and R. Pathania (EPRI) (USA) Integrity Evaluation of Alloy 600 RV Head Penetration Tubes in Korean PWR Plants 199 Y. H. Kang et al. (KAERI, Korea) Stress Corrosion Cracking Behavior of Alloy 600 in High Temperature Water 207 G. L. Webb and M. G. Burke (Bettis Laboratory, Westinghouse Electric Corporation, USA) Recent Information on Top Head Replacement in Japan 231 T. Takahashi (JPEIC, Japan) SESSION IV. Chairmen: W. H. Bamford and C. Faidy Thermally Activated Dislocation Creep Model for Primary Water Stress Corrosion Cracking of NiCrFe Alloys 243 M. M. Hall, Jr. (Bettis Laboratory, Westinghouse Electric Corporation, USA) Prediction of PWSCC in Nickel Base Alloys Using Crack Growth Rate Models 253 C. D. Thompson (Knolls Atomic Power Lab, General Electric Company, USA) Head Penetration Cracking Comparison of the BWR and PWR Experience