ML24274A177
| ML24274A177 | |
| Person / Time | |
|---|---|
| Issue date: | 10/01/2024 |
| From: | Robert Tregoning, John Wise NRC/RES/DE |
| To: | |
| Shared Package | |
| ML24274A175 | List: |
| References | |
| Download: ML24274A177 (7) | |
Text
NRC Research:
Readiness for Long-Term Operation Rob Tregoning & John Wise Nuclear Regulatory Commission NRC Workshop on Structural Materials: Research for Beyond 80 Years October 1 - 3, 2024
2 Why are We Here?
- Be Ready
- License renewal governed by 10 CFR Part 54
- Be Proactive
- Aging management guidance evolves from operating experience and research findings
- Start a Broader Stakeholder Conversation
- While we continually assesses research needs, its essential to engage nuclear community Commercial Operation Begins 1st License Renewal Original Licensing Period 1st Subsequent License Renewal Start Ops 20 40 60 80 2nd Subsequent License Renewal Period of Extended Operation Period of Extended Operation Average U.S.
Plant Age Oldest U.S.
Plants Earliest application for 2nd SLR Period of Extended Operation
3 How Did We Get Here?
- Public meetings in 2021
- Discuss technical issues and develop guidance documents associated with life extension beyond 80 years
- Hold public dialog on possibility of extending renewed licenses from 20 to 40 years
- Relevant outcomes
- Consider research activities to achieve greater exposure levels to address expected conditions for greater than 80 years of operation
- Evaluate impact of plant risk from the combined effects of multiple aged components (NUREG-1412)
- Develop a Research Strategy for Long-Term Operation, which identifies knowledge gaps and provides recommendations for addressing
4 What Do We Hope to Achieve?
- Identify research topics to consider pursuing
- Extension of existing activities
- New efforts and focus areas
- Gather opinions on knowledge gaps
- Safety significance
- Associated uncertainties
- Explore possible research strategies
- Aging strategies, including harvesting
- Evaluation methods
- Assessing significance
5 How Will We Do It?
- Previously, Phenomenon Identification and Ranking Table (PIRT)-
process used to identify and prioritize knowledge gaps
- Conducted Proactive Materials Degradation Assessment (PMDA) during initial license renewal period
- Conducted Expanded Materials Degradation Assessment (EMDA) prior to subsequent license renewal period
- Framework for much of NRCs research supporting LTO over the past 15 years
- Three pillars supporting NRCs future research efforts
- PMDA and EMDA efforts and outcomes of supporting research programs
- Operating experience and associated effectiveness of aging management programs
- Identification and assessment of additional research gaps
6 What Will Be the Next Steps?
- Assess research gaps
- Prioritize based on potential safety-significance and current uncertainties
- Develop research strategies
- Evaluate efficacy of ongoing research programs
- Modify, as needed, to investigate relevant conditions
- Continue to pursue ex-plant harvesting, as appropriate
- Align on research priorities
- Identify organizational actors and leads
- Pursue collaboration when warranted
- Document Research Strategy for Long-Term Operation
7 How Does This Fit into the Regulatory Framework?
- Regulatory preparations for the next renewal period
- Timelines historically driven by industrys expressed intent to apply
- Knowledge gaps will inform guidance and, if appropriate, the rule 2030 2020 2010 2000 2029 First reactor reaches 60 years 2017 Final SLR guidance 2018 First SLR applications 2009 Earliest allowable submittal of SLR application 2015 Draft SLR guidance 2014 SECY regulatory considerations 2007 Industry interest in SLR 60-80 Prep 2008, 2011 NRC-DOE international conferences on beyond 60 2014 EMDA reports 2011 AMP audits