ML24261A267
| ML24261A267 | |
| Person / Time | |
|---|---|
| Issue date: | 09/17/2024 |
| From: | William Rautzen NRC/NRR/DRA |
| To: | |
| References | |
| Download: ML24261A267 (1) | |
Text
©2024 Nuclear Energy Institute 1 Industry Proposed Approach to Address Category 1 Severe Accidents for SLRAs Public Workshop Sept 18, 2024
©2024 Nuclear Energy Institute 2 Initial license renewal applications provided extensive information for Severe Accident Mitigation Alternatives Industry developed common guidance that drove a detailed review of previous industry SAMAs provided in individual plant supplements to NUREG-1437 (plant-specific SEIS) 2024 Environmental Rule and GEIS, NUREG-1437 Revision 2 reclassified Severe Accidents as a fully Category 1 environmental issue Paradigm Shift
©2024 Nuclear Energy Institute 3 Chapter 3 Provide best available core damage frequency and large early relief frequency values for all hazards and reactor power uprates for comparison to the LR GEIS values Provide summary information regarding any accidents that exceed the design basis with justification for its acceptability during the SLR term Chapter 4 No discussion since no longer a Category 2 issue Chapter 5 Provide description of New and Significant review process applied for all Category 1 issues Describe any environmental impacts associated with New and Significant information identified If no New and Significant information is identified with environmental impacts, the detailed discovery review is separately made available for NRC review Proposed Environmental Report (ER) Approach Based on RG 4.2, Supplement 1, Revision 2
©2024 Nuclear Energy Institute 4 Restate Environmental Issue Finding from 10 CFR Part 51 Appendix B, Table B-1 Provide relevant supporting GEIS sections for background and context Describe the evaluation of the postulated accident environmental issue used to determine if new information exists that is also significant Utilize new and significant definition as provided in RG 4.2, Supplement 1, Revision 2 New and Significant Review Basis Report Outline
©2024 Nuclear Energy Institute 5 internal events information external events new source term information power uprates higher fuel burnup low power and shutdown events Spent fuel pool accidents use of BEIR VII risk coefficients Uncertainties SAMAs New and Significant Review Basis Report Outline, contd If new initial license renewal SAMA information as documented in individual plant SEIS published after the time of the 2024 GEIS is available, these new SAMAs should be treated as new information and screened for significant decrease in risk that are cost beneficial If the probability-weighted consequences of a severe accident have gone down since the applicants SAMA review, no review of the previous plant-specific SAMA analysis is needed For Severe Accidents, individual topics examined for new information include the list of topics dispositioned in GEIS Table E.5-1
©2024 Nuclear Energy Institute 6 New industry SAMA screening approach Determine if SAMA is already implemented Determine if SAMA is of a similar plant design Determine if the SAMA results in a risk reduction of greater than 1E-5 in the estimated mean value CDF Document screening results Provide overall conclusions relative to the impact finding of Severe Accidents from Table B-1 New and Significant Review Basis Report Outline, contd
©2024 Nuclear Energy Institute 7 Summary
Intend to leverage and credit the 2024 GEIS information for SAMAs to maximum extent
ER content for Severe Accidents will follow similar level of detail and format as that of other Category 1 Environmental Issues
Details of New and Significant Evaluation will be documented in the New and Significant Evaluation Report available for audit
©2024 Nuclear Energy Institute 8 Questions