ML22143A836
| ML22143A836 | |
| Person / Time | |
|---|---|
| Issue date: | 05/25/2022 |
| From: | Matthew Homiack NRC/RES/DE |
| To: | |
| Kalikian R, 301-415-5590 | |
| Shared Package | |
| ML22143A408 | List: |
| References | |
| Download: ML22143A836 (9) | |
Text
Extremely Low Probability of Rupture (xLPR) Code NRC Per spectives 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
Fracture Mechanics Different Analysis Approaches Probabilistic Approach Multiple Calculations Aggregated to Give Probability of Failure over Time Stress + Toughness + Crack Growth + Crack Size Life Single Calculation Conservatively Conservatively Conservatively Conservatively Plus Margin Gives High Value Low Value High Value High Value Single, Conservative Result Deterministic Approach 2
xLPR Code Capabilities and Limitations
> Stress-Corrosion Cracking
> Thermal and Mechanical Fatigue
> Crack Initiation
> Leak Rate Calculations
> Residual Stress Effects
> Water Chemistry
> Ultrasonic Inspections
> Seismic Effects
> Mechanical Mitigation
> Models Only Certain Failure Modes
> Limited to Butt-Weld Geometry
> Only Performs Component-Level Analyses 3
Recently Completed NRC Projects NUREG-2247 / Electric Power Research Institute (EPRI) 3002013307 Extremely Low Probability of Rupture Version 2 Probabilistic ML21225A736 Fracture Mechanics Code TLR-RES/DE/REB-2021-09 Probabilistic Leak-Before-Break Evaluation of Westinghouse Four-Loop Pressurized-Water Reactor Primary Coolant Loop Piping ML21217A088 using the Extremely Low Probability of Rupture Code TLR-RES/DE/REB-2021-14-R1 Probabilistic Leak-Before-Break Evaluations of Pressurized-Water Reactor Piping Systems using the Extremely Low Probability of ML22088A006 Rupture Code 4
Ongoing NRC Projects International Benchmark Co-leading Study Organized through the Nuclear Energy Agency Software Maintenance and Development Continued Cooperation with EPRI 5
xLPR Ve r s i o n 2 . 2 Re l e a s e Summer 2022
> Improved preprocessor with 64-bit support
> Minor bug fixes identified through leak-before-break studies
> Other user enhancements 6
Future NRC Plans
> Use the xLPR code to support risk-informed decisions on licensing reviews and other regulatory activities
> Continue to maintain and develop the code to the state-of-practice
> Build the international user community 7
Public Meeting Announcement MARK CALENDAR June 14 th Public meeting with EPRI to Discuss Use of the xLPR Code for Loss-of-Coolant Accident Frequency Estimates
> Details and agenda are in the public meeting announcement (ML22133A035) 8
Have Questions or Need Infor mation on xLPR?
xlpr@nrc.gov xlpr@epri.com 9