ML21272A130
| ML21272A130 | |
| Person / Time | |
|---|---|
| Issue date: | 09/29/2021 |
| From: | Patrick Raynaud NRC/RES/DE/CIB |
| To: | |
| Raynaud P | |
| References | |
| Download: ML21272A130 (13) | |
Text
Modernizing NRCs Vessel Integrity Assessment Tools Patrick Raynaud Senior Materials Engineer U.S. Nuclear Regulatory Commission IGRDM 2021
Disclaimer This presentation was prepared as an account of work sponsored by an agency of the U.S.
Government. Neither the U.S. 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 partys use, or the results of such use, of any information, apparatus, product, or process disclosed in this presentation, or represents that its use by such third party would not infringe privately owned rights. The views expressed in this paper are not necessarily those of the U.S. Nuclear Regulatory Commission.
10/13/2021 IGRDM 2021 2
NRCs Vessel Integrity Assessment Tools
- REAP: the Radiation Embrittlement Archive Project
- https://reapdatabase.nrc-gateway.gov/
- Archival information concerning the effects of neutron radiation on the properties of reactor pressure vessel steels
- FAVOR: Fracture Analysis of Vessels - Oak Ridge
- https://www.nrc.gov/about-nrc/regulatory/research/safetycodes.html#mpc
- Latest version v20.1.12, released July 2021
- Both tools are actively being maintained, modernized, and further developed 10/13/2021 IGRDM 2021 3
REAP: the Radiation Embrittlement Archive Project
- REAP first created for NRC by Oak Ridge in the 2010s, went online early 2017
- REAP contains following data:
- Capsules: fluence, materials, chemistry, heat treatment, Charpy specimens, tensile specimens
- 140 US and international reactors
- 11 countries
- 14 vessel manufacturers
- 450 reports
- Data up to 2016 10/13/2021 IGRDM 2021 4
REAP Improvements
- Improved user interface
- Implemented data checking for new data input
- Moved from .NET and C# to Django (Python based)
- Improved maintainability of the code
- Streamlined code
- Git source tracking
- Improved service
- Site availability checking
- Future improvements:
- Website security
- New data from 2016 to today being added
- Improved output - Embrittlement data analysis feature being fixed
- New .xlsx output (versus .xls) and will be added soon 10/13/2021 IGRDM 2021 5
REAP Access
- Request account
- Request reviewed by NRC
- Login
- Password 10/13/2021 IGRDM 2021 6
FAVOR: Fracture Analysis of Vessels - Oak Ridge
- Developed in the 1990s at Oak Ridge National Laboratory
- First release in 2001
- Regular releases: 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2012, 2015, 2016
- Current version: v20.1.12 10/13/2021 IGRDM 2021 7
FAVOR v20.1.12 Capabilities
- Available models and options
- One or many transients - Warm prestress
- Temperature (in)dependent material properties - Ductile tearing
- Weld residual stress and cladding stresses (stress - Crack propagation free temperature) - Weld layer resampling
- Flaw populations - Fluence and chemistry sampling parameters
- Surface and embedded
- Probabilistic analysis
- Internal and external
- Deterministic analyses
- Sampled from VFLAW output formatted file
- Time histories
- As-found: user-specified, new in v20.1.12
- Through-wall profiles
- Embrittlement models - Deterministic minimization: lowest RTNDT to
- RG-1.99 Rev.2, EONY (several versions) cause crack growth initiation given a crack and a
- Detailed vessel mapping possible transient 10/13/2021 IGRDM 2021 8
FAVOR v16.1 Characteristics
- Legacy source code
- Fixed format Fortran 77/90/95
- Difficult to maintain
- 3 sub-codes: FAVLOAD, FAVPFM, FAVPOST
- Serial execution with text-based data transfer
- Lots of I/O files
- User (not-so) friendly
- Rigid input formats
- Excel input generator helps, but
- Runtime prompts
- New batch files included in distribution help for Windows
- NOT parallel, NOT object-oriented
- Old SQA procedures
- No automated source tracking
- No automated testing 10/13/2021 IGRDM 2021 9
FAVOR v20.1.12 Characteristics
- Still old Fortran
- Free format Fortran 77/90/95
- Some level of modularization
- Minimal refactoring from v16.1
- Back compatible to v16.1
- Same input formats and same runtime prompts
- Still not parallel or object-oriented
- Improved SQA procedures
- Automated source tracking via Git and GitHub
- Automated testing via GitHub
- New SQA documentation partly developed 10/13/2021 IGRDM 2021 10
FAVORFAVPRO: Fracture Analysis of Vessels - Probabilistic
- Same capabilities
- Still under development - Same models (mostly) and validation, but better implementation
- You cant get it yet probably late 2022
- (R)evolution from FAVOR
- NOT back-compatible
- To allow for bigger leap forward 10/13/2021 IGRDM 2021 11
FAVPRO Features
- Fortran 2018
- Parallel and object-oriented
- Will give same results as FAVOR, but WAY faster!
- Fully modularized
- Cross-platform, cross-compiler support
- MacOS, Windows, Linux
- Reliance on free well-maintained libraries
- Implementation of automated unit testing
- Broader and deeper test suite
- Unit and integration testing via GitHub
- Modern I/O via JSON 10/13/2021 IGRDM 2021 12
Distribution and User Group
- Current and future distribution of FAVOR and FAVPRO will be exclusively through user group
- Free for now to get FAVOR v20.1.12
- Membership is automatic when entities obtain access to FAVOR/FAVPRO
- Requests for access should be sent to Patrick.Raynaud@nrc.gov
- Requires signature of a non-disclosure agreement (NDA)
- Vetted by NRC and Department of State (when applicable)
- Distribution includes
- Documentation (SQA, User Manual, Theory Manual)
- Test suite
- Executables
- What about source code?
- In general, no access to source code
- Access to source code might be possible in special cases
- NRC needs to see clear benefit in distributing the source to a user group member (e.g. in-kind contributions)
- Requires discussions between interested parties and NRC 10/13/2021 IGRDM 2021 13