ML23234A136
| ML23234A136 | |
| Person / Time | |
|---|---|
| Site: | Electric Power Research Institute |
| Issue date: | 09/20/2023 |
| From: | Lois James Licensing Processes Branch |
| To: | Gerond George Licensing Processes Branch |
| Shared Package | |
| ML23234A133 | List: |
| References | |
| Download: ML23234A136 (1) | |
Text
September 20, 2023 MEMORANDUM TO:
Gerond A. George, Chief Licensing Projects Branch Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation FROM:
Lois M. James, Senior Project Manager
/RA/
Licensing Projects Branch Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation
SUBJECT:
SUMMARY
OF TECHNICAL MEETING ON PROBABILISTIC FRACTURE MECHANICS AND NONDESTRUCTIVE EXAMINATION OF CAST AUSTENITIC STAINLESS STEEL On August 22, 2023, the staff of U.S. Nuclear Commission (NRC) met with the staff of Electric Power Research Institute (EPRI) and Dominion Engineering, Inc. (DEI), EPRIs contractor, to discuss how EPRI is developing a code using probabilistic fracture mechanics (PFM) to predict flaw growth and stability for postulated flaws in cast austenitic stainless steel (CASS) piping.
EPRIs work will be used to support development of a supplement to American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel (BPV),Section XI, Appendix VIII, and alternatives to Section XI, IWB-2500 inspection requirements for CASS piping components and potential changes to IWB-3514 and IWB-3640 flaw acceptance and flaw evaluation procedures.
The meeting between the NRC staff and EPRI staff was a closed meeting due to the proprietary nature of the information and discussion (ADAMS Accession No. ML23240A708). The meeting began at 9:00 am and ended at 12:00 pm. There were thirteen NRC staff members, two EPRI members, and three industry members in support of EPRI. No member of the public was in attendance due to the proprietary nature of the meeting. The meeting began with introductions of the NRC staff, EPRI staff, and DEI staff.
The NRC and EPRI staff and contractors had a discussion on the Piping Integrity Probabilistic Evaluation for Reactors - Cast Austenitic Stainless Steel (PIPER-CASS). Specifically, the discussion focused on what it is, how it was developed, what are its limitations, and what is its future.
CONTACT: Lois M. James, NRR/DORL 301-415-3306
The EPRI discussed the development of PFM code - PIPER-CASS, PFM evaluations for axial flaws, PFM evaluations for circumferential flaw, and research update on CASS nondestructive examination (NDE).
The EPRI staff explained that the PIPER-CASS is custom PFM software developed by EPRI under commercial quality assurance program. PIPER--CASS is tailored for evaluation of CASS to enhanced elastic-plastic fracture mechanics (EPFM) stability solver for degraded toughness materials like thermally aged CASS; to provide extended EPFM stability checks to part-through-wall flaws; and to provide greater flexibility when defining operating transients, with integrated thermal stress solver. Further, EPRI staff explained that PIPER-CASS was benchmarked against Extremely Low Probability of Rupture (xLPR), a PFM code for piping applications that was jointly developed by the NRCs Office of Nuclear Regulatory Research and EPRI.
The EPRI staff stated that they are in the process of opening a record number with the Task Group on Inspectability, ASME BPV Code Section XI, for a proposed draft code case for axial flaws. Further, the EPRI staff stated that they do not plan to submit a topical report regarding the PFM evaluations performed using the PIPER-CASS code to the NRC for review and approval.
The EPRI staff stated that they will be publishing a public technical report summarizing the PFM evaluation results in the fourth quarter of Calendar Year 2023 If you have any questions or comments, please contact me via e-mail at Lois.James@nrc.gov.
Docket No. 99902021
Enclosures:
List of Attendees
Enclosure U.S. Nuclear Regulatory Commission Public Meeting - Attendees List August 22, 2023
Title:
Technical Meeting between the U.S. Nuclear Regulatory Commission (NRC) and Electric Power Research Institute (EPRI) to Discuss Probabilistic Fracture Mechanics (PFM) and Nondestructive Examination of Cast Austenitic Stainless Steel Name NRC Participants Michael Benson NRC Mat Burton NRC Jay Collins NRC Stephen Cumblidge NRC David Dijamco NRC Lois M. James NRC Seung Min NRC Carol Nove NRC Eric Palmer NRC Cory Parker NRC David Rudland NRC Robert Tregoning NRC John Tsao NRC Dan Widrevitz NRC Name EPRI Participants Carl Latiolais EPRI Do Jun Shim EPRI Name Dominion Engineering, Inc. (DEI) Participants Kevin Fuhr DEI Glenn White DEI Matthew Wolfson DEI Public Participants No member of the public was in attendance due to the proprietary nature of the meeting.
ML23234A133 (pkg);
ML23234A136 (memo and summary);
ML23222A226 (meeting notice);
ML23237B394 (meeting slides - nonpublic)
- via eConcurrence NRR-106 OFFICE NRR/DORL/LLPB/PM* NRR/DORL/LLPB/LA* NRR/DNRL/SL*
NRR/DNRL/NVIB/BC*
NAME LJames DHarrison DRudland ABuford DATE 08/30/2023 09/05/2023 09/05/2023 09/18/2023 OFFICE NRR/DNRL/NPHP/BC* NRR/DORL/LLPB/BC* NRR/DORL/LLPB/PM*
NAME MMitchell GGeorge LJames DATE 09/18/2023 09/19/2023 09/20/2023