ML23146A102
| ML23146A102 | |
| Person / Time | |
|---|---|
| Issue date: | 06/14/2023 |
| From: | Matthew Homiack, Ali Rezai NRC/NRR/DNRL/NPHP, NRC/RES/DE |
| To: | |
| References | |
| Download: ML23146A102 (1) | |
Text
Extremely Low Probability of Rupture (xLPR) Code NRC Per spectives and Activities Matthew Homiack Materials Engineer U.S. Nuclear Regulatory Commission Office of Nuclear Regulatory Research Division of Engineering Reactor Engineering Branch Matthew.Homiack@nrc.gov
+1 (301) 415-2427
Maintenance and Development Version 2.2 Publicly available at no cost Send inquires to xlpr@nrc.gov and xlpr@epri.com Version 2.3 Development underway Optimized crack initiation module Exploring Process Improvements GitHub for software development and version control Agile software development process 2
NRC Applications Integration of Probabilistic Fracture Mechanics with Artificial Intelligence and Machine Learning (AI/ML)
AI > NRC Future Focused Research project
> AI/ML can perform analyses recommended by Regulatory Guide 1.245, Preparing Probabilistic Fracture Mechanics Submittals Loss of coolant accident initiating event frequency estimation
> Public meetings with the Electric Power Research Institute (EPRI) on June 14, 2022, and January 19, 2023
> Confirmatory xLPR analyses Chloride Induced Stress Corrosion Cracking of Spent Fuel Storage Canisters
> Investigating impact of improved crack growth modeling 3
NRC Applications Continued Stress Corrosion Cracking of Stainless Steel
> Emergent issue support
> Initiating event frequency input to probabilistic risk assessment Thermal Aging Embrittlement of Cast Austenitic Stainless Steels
> Sensitivity studies
> Exploring modeling options 4
Inter national Benchmarking Over view Code Analyst Organization Beyond-PRAISE Structural Integrity Associates, Inc., USA DeMoT Nuclear Research and Consultancy Group, Netherlands The NRC is co-leading an NURBIT Kiwa Technical Consulting AB, Sweden international benchmarking effort PEDESTRIAN Central Research Institute of Electric Power Industry, Japan organized through the Nuclear PASCAL-SP Japan Atomic Energy Agency Energy Agency PRAISE-CANDU Candu Energy, Inc., Canada Engineering Mechanics Corporation of Columbus, USA; Korea PRO-LOCA Institute of Nuclear Safety, Republic of Korea; and Paul Scherrer Institut (PSI), Switzerland 14 Probabilistic PROMETHEUS Engineering Mechanics Corporation of Columbus, USA PSI, Switzerland; and PROST Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, Fracture SACC Germany Lithuanian Energy Institute Mechanics Codes SIF-Master IPP Centre, Ukraine VTTBESIM VTT Technical Research Centre, Finland xLPR U.S. Nuclear Regulatory Commission Xpipe MPA University of Stuttgart, Germany 5
The Benchmark Problem Circumferential crack in a 380-mm (15-inch) piping butt-weld Pressurized-water reactor hot-leg operating conditions Material: Alloy 182 Cracking mechanism: Primary water stress-corrosion cracking (PWSCC) 6
Deter ministic Benchmark Comparisons Axial Welding Residual Stress DP-01 Leak-Before-Break Results DP-02 Leak-Before-Break Results 7
Probabilistic Benchmark Comparisons PP-01 Probability of Rupture Results PP-03 Probability of Rupture Results 8
Benchmark Publications 2022 American Society of Mechanical Engineers (ASME) Pressure Vessels and Piping Conference PVP2022-84724, Probabilistic Fracture Mechanics Codes for Piping International BenchmarkPart 1: Deterministic Comparisons 26th International Conference on Structural Mechanics in Reactor Technology (SMiRT26)
Th.2.H.5, Assessment of International Probabilistic Fracture Mechanics Code Models and Capabilities for Piping Applications 2023 ASME Pressure Vessels and Piping Conference PVP2022-105733, Probabilistic Fracture Mechanics Codes for Piping International BenchmarkPart 2: Probabilistic Comparisons 9
Summary
> The NRC and EPRI are making xLPR more efficient and easier to maintain
> The xLPR code is leading the international state-of-practice
> Areas of application of the xLPR code are rapidly expanding 10