ML24220A292
| ML24220A292 | |
| Person / Time | |
|---|---|
| Issue date: | 08/14/2024 |
| From: | Banks I NRC/NRR/DNRL/NLIB |
| To: | |
| References | |
| Download: ML24220A292 (1) | |
Text
Reactor Accident Analysis Modernization (RAAM)
August 14, 2024 Public Information Meeting 0
Public Information Meeting 1
This meeting is a public information meeting with a question-and-answer session; however, the NRC is not actively soliciting comments towards regulatory decisions at this meeting.
Agenda 2
Time*
Topic Speaker 1:00pm - 1:15pm Opening Remarks NRC 1:15pm - 2:00pm Presentation from the NRC NRC 2:00pm - 2:30pm Discussion NRC/Stakeholders 2:30pm - 2:40pm Break 2:40pm - 3:50pm Opportunity for Public Comment NRC/Public 3:50pm - 4:00pm Closing Remarks NRC
- Times are approximate, and the meeting may end early depending on the amount of discussion.
What is the RAAM Working Group?
3
- The RAAM Working Group is a team of seven senior technical experts and reviewers from multiple offices and divisions
- Members have extensive background in either accident analysis or risk analysis
- The RAAM Working Group was formed at the request of the NRR Executive Team to look for improvements in licensing related to reactor accident analysis
Goals of the RAAM Working Group 4
Review NUREG-0800 Ch. 15 methods and propose ways to modernize the approach
- Use a holistic approach
- Risk inform where possible
- Use insights from ongoing reviews and related efforts Focus is on both operating and new light water reactors
Goals of the RAAM Working Group 5
Final goal is to produce a report for the NRR Executive Team summarizing the RAAM Working Groups conclusions
- Identifies ideas that could be further investigated
- Identifies options for implementation
- Estimates level of interest from both operating reactors licensees and new applicants
- Provides final recommendation for each idea
RAAM WG Identified Focus Areas 6
- Anticipated Operational Occurrence (AOO) Acceptance Limits (e.g.,
Specified Acceptable Fuel Design Limits (SAFDLs))
- Non Safety-Related Systems, Structures and Components (SCCs)
- Loss of Coolant Accidents
- Single Failure Criteria
- Environmental Qualification
- Design Basis Accidents
- Licensing Modernization Project (LMP) Applications
RAAM WG Conclusions 7
- The RAAM WG developed potential ideas for enhancements and evaluated potential options
- In several cases, significant past work has been done to develop potential enhancements - this past work can be leveraged as appropriate
- The WG considered several attributes
- Resource Impact
- Potential benefit to operating LWRs
- Potential benefit to new LWR applicants
- Color coding Green - low resource impact or high benefit Orange - medium resource impact or medium benefit Red - high resource impact or low benefit
RAAM WG Conclusions 8
Item Report Section Resource Impact Potential Benefit RAAM WG Comment Operating Reactors New Reactors Redefine Acceptable Fuel Design Limits (SARRDLs /
SAFDLs) 2.1 High Low Medium Additional Study Needed (e.g.,
Public Meeting).
Potentially useful long term, but not near term.
Will require significant internal and external stakeholder engagement Risk-Informed Guidance for Crediting Non-Safety-Related SSCs 2.2 Medium / High Low High Pursue - High Priority Will require significant internal and external stakeholder engagement
RAAM WG Conclusions (cont.)
9 Item Report Section Resource Impact Potential Benefit RAAM WG Comment Operating Reactors New Reactors Use of an Alternate Criteria to 95/95 for LOCA 2.3 Low Medium Medium Pursue - High Priority Could potentially be done quickly Redefine Large Break LOCA to Beyond Design Basis Event 2.4 High High High Pursue - Under Increased Enrichment Rulemaking Consistent with IE Rulemaking Schedule Reconsideration of LOCA Break Locations 2.5 Medium / High Low Low Defer - limited interest from industry
RAAM WG Conclusions (cont.)
10 Item Report Section Resource Impact Potential Benefit RAAM WG Comment Operating Reactors New Reactors Risk-inform Single Failure Criteria 2.6 Medium Low High Pursue Will require significant internal and external stakeholder engagement Define Single Passive Failures for Fluid Systems 2.7 Medium / High Low High Pursue Will require significant internal and external stakeholder engagement
RAAM WG Conclusions (cont.)
11 Item Report Section Resource Impact Potential Benefit RAAM WG Comment Operating Reactors New Reactors Risk-Inform EQ Radiological Requirements 2.8 Medium Low Low Defer Anticipate limited industry interest Increase the Coherence and Consistency of DBA Radiological Consequence Analysis 2.9 Continue to pursue resolution of DPO 2020-002 (ML21067A645) and 2021-001 (ML23263A639) with high priority
RAAM WG Conclusions (cont.)
12 Item Report Section Resource Impact Potential Benefit RAAM WG Comment Operating Reactors New Reactors Use of LMP Results to Focus Staff Reviews 2.10 Low Low Medium Pursue Could be implemented similar to the Enhanced Safety Focused Review Approach (ESFRA).
Use of Event Sequence Frequencies to Risk-Inform Design Basis Event Categorization 2.11 Medium / High Low High Pursue Will likely require additional research effort
Next Steps 13
- Finalize RAAM Working Group report
- Develop path forward for endorsed items (if directed by Executive Team)
Questions/Comments?
14