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 Perspectives
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 Dif ferent Anal ysis Approaches
Probabilistic Approach Multiple Calculations Aggregated to Give Probability of Failure over Time
Stress +Toughness +Crack Growth +Crack SizeLife
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
33 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-Wa t e r 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 Ver sion 2.2 Release
Summer 2022
> Improved preprocessor with 64-bit support
> Minor bug fixes identified through leak-b efo re-break studies
> Other user enhancements
6 Futur e 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
77 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