ML21217A251

03 - NRC - Favor Update

ML21217A251
Person / Time
Issue date:	08/09/2021
From:	David Dijamco Office of Nuclear Reactor Regulation
To:
Hiser A
Shared Package
ML21217A247	List: ML21217A251 ML21217A252 ML21217A256 ML21217A257 ML21217A259 ML21217A260 ML21217A261 ML21217A262 ML21217A263 ML21217A302 ML21217A303 ML21217A304 ML21218A068 ML21221A124
References
Download: ML21217A251 (7)

Text

FAVOR Code Update NRC-Industry Materials Information Exchange Public Meeting August 10, 2021 David Dijamco Office of Nuclear Reactor Regulation Vessels and Internals Branch

From last years update Findings from V&V assessment of FAVOR (TLR-RES/DE/CIB-2020-02, ML20017A170) 1 Absence of SQA Plan o Draft SQA Plan created, under RES review and revisions 2 Absence of Change Control and Documentation o Action to close: implement change control procedures in SQA plan o GitHub repository created and FAVOR source put under version control in NRCs cloud environment (non-public) 3 Absence of Software Configuration Management o Plans to create and implement Configuration Management And Maintenance Plan (CMMP) 4 Absence of FAVOR Baseline o Plans to create and run test suite, document results as baseline 5 Key Capability Deficiency: As-Found Flaw Modeling o As-found flaw FAVOR code nearly completed and V&V testing mostly completed, documentation still underway NRC-Industry Materials Information Exchange Public Meeting - August 2021 2

FAVOR Version 20.1.12 Added capability to analyze as-found flaws; backwards compatible with version 16.1

• Users guide (ML21175A301) o Added Appendix C

• Theory manual (ML21175A300) o Added Section 2.1 o Added Appendix H

• How to get the code (from the NRC public website):

https://www.nrc.gov/about-nrc/regulatory/research/obtainingcodes.html Distribution of FAVOR is handled by the NRC staff. Requestors will need to fill out, sign, and return this non-disclosure agreement. When complete, it may be mailed to the address listed on the form or sent to safetycodes@nrc.gov. The code is provided at no cost; however, no technical assistance is provided.

NRC-Industry Materials Information Exchange Public Meeting - August 2021 3

As-found FAVOR v20.1.12 file

• Prompted by IPFLAW parameter set equal to 4 (uses only a single flaw file instead of three)

• Details are in Appendix C of the users guide and Appendix H of the theory manual NRC-Industry Materials Information Exchange Public Meeting - August 2021 4

FAVOR Version 20.1.12 Summary of verification and validation for as-found flaw capability

• As-found flaw data are correctly read in

• Input data accurately processed to calculate other variables (axial/hoop stresses, RTNDT, temperature at crack tip, etc.)

• Input data are within acceptable ranges

• Details in H.5 and H.6 in Appendix H of theory manual NRC-Industry Materials Information Exchange Public Meeting - August 2021 5

FAVOR software quality assurance

• Software quality assurance plan (ML21180A161)

• Configuration management and maintenance plan (ML21180A167)

• Software requirements document is underway.

• Continuous integration testing implemented: every time a change is made, tests are automatically performed, and test documentation is automatically generated.

NRC-Industry Materials Information Exchange Public Meeting - August 2021 6

FAVOR development still going Further enhancements to FAVOR are underway such as input generator, modularization, explicit typing, conversion to free-form source, continuous integration testing.

Regulatory applications of FAVOR:

• Used in the probabilistic fracture mechanics NRC acceptance of 10 CFR 50.55a(z)(1) alternative requests for BWR reactor pressure vessel circumferential welds

• Used in the technical basis for alternative pressurized thermal shock rule (10 CFR 50.61a)

NRC-Industry Materials Information Exchange Public Meeting - August 2021 7