Cross-Cutting Activities

This list shows the ongoing licensing initiatives, projects, and activities that the staff of the U.S. Nuclear Regulatory Commission (NRC) has targeted for greater use of risk information that substantially crosscut multiple subarenas (using expanding menus):

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Consolidated Decommissioning Guidance (NUREG-1757

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This guidance is being revised to enhance the risk informed, performance- based approach to the demonstration of compliance. The staff completed the development of responses to public comments. In addition, the staff updated the models and codes used for risk and dose assessment reviews in support of the risk-informed approach. The final NUREG-1757, Volume 2, Revision 2 is expected to be issued in the summer 2022 timeframe.

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Consideration of Safety Significance in Addressing NMSS Licensing Basis and Potential Violation Questions

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During the past year the working group continued to refine the approach and an example past fuel cycle inspection issue was used to explore additional insights and improvements in the qualitative/semi-quantitative issue screening process. During the fall an additional issue was identified for low level waste that demonstrated how the risk triplet/BeRiskSMART approach could be used in identifying the appropriate options to consider when addressing an issue involving the interface between the inspection and licensing paradigms. As issues arise, the working group will continue to refine and further develop the approach and technical bases behind the process.

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Rulemaking Activities

For more information see existing public website.

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RG 1.200, Acceptability of Probabilistic Risk Assessment Results for Risk-Informed Activities (LWRs)

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RG 1.200, Revision 3, was published in December 2020. RG 1.200, Revision 3, endorses NEI 17-07, Revision 2, “Performance of PRA Peer Reviews Using the ASME/ANS PRA Standard,” issued August 2019; ASME/ANS RA-S Case 1, “Case for ASME/ANS RA-Sb-2013 Standard for Level 1/Large Early Release Frequency Probabilistic Risk Assessment of Nuclear Power Plant Applications,” dated November 22, 2017; and portions of PWROG-19027-NP, Revision 2, “Newly Developed Method Requirements and Peer Review,” issued July 2020

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PRA Standards Development

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Continued support for the development of the next edition of the ASME/ANS Level 1/LERF LWR PRA standard.  The NRC voted on two ballots for this PRA standard and provided technical comments to the JCNRM in support of publishing the document.

Continued support for the development of the Level 2 LWR PRA standard to prepare for subsequent ballot reviews for publication.

Continued support for the development of the Level 3 LWR PRA standard to prepare for subsequent ballot reviews for publication.

Continued support for the development of the LPSD LWR PRA standard to prepare for subsequent ballot reviews for publication.

Continued support for the development of the ALWR PRA standard to prepare for subsequent ballot reviews for publication.

Supported the development of the recently published NLWR PRA standard, ASME/ANS RA-S-1.4-2021.  The NRC voted on two ballots for this PRA standard and provided technical comments to the JCNRM in support of publishing the document.  The staff reviewed the NLWR PRA consensus standard and are in the process of completing the endorsing trial use regulatory guidance document, RG 1.247.

Continued support for the development of the multi-unit LWR PRA standard.

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Industry Peer Review Guidance Development

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The staff endorsed NEI 17-07, Revision 2, in Regulatory Guide 1.200, Revision 3.

The staff plan to endorse NEI 20-09, Revision 1, in the trial-use RG 1.247.

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Risk-Informed Steering Committee (RISC)

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No Update

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Regulatory Guide 1.174, An Approach for Using Probabilistic Risk Assessment in Risk-Informed Decisions on Plant Specific Changes to the Licensing Basis

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Staff and industry continue to use RG 1.174 in support of risk-informed activities

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NUREG 1855, Guidance on the Treatment of Uncertainties Associated with PRAs in Risk-Informed Decisionmaking

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Staff and industry continue to use NUREG-1855 in support of risk-informed activities. The staff continue preparations for the next revision of NUREG-1855 to align with the next edition of the ASME/ANS Level 1/LERF LWR PRA standard and to consider other potential enhancements such as expanded guidance on the treatment of uncertainties in PRA for advanced LWRs.

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Achieving the Vision of Becoming a Modern, Risk-Informed Regulator

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No Update

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Regulatory Improvements for Production and Utilization Facilities Transitioning to Decommissioning Rulemaking

For more information see existing public website.

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Page Last Reviewed/Updated Monday, March 07, 2022