ML24082A179
| ML24082A179 | |
| Person / Time | |
|---|---|
| Site: | Nuclear Energy Institute |
| Issue date: | 03/14/2024 |
| From: | Pan Q, True D NRC/NRR/DRA/APOB, Nuclear Energy Institute |
| To: | |
| References | |
| Download: ML24082A179 (5) | |
Text
©2024 Nuclear Energy Institute Doug True NRC Regulatory Information Conference March 14, 2024 The Evolving Role of Risk-informed Decisionmaking in Nuclear Safety
©2024 Nuclear Energy Institute 2 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 Risk-informing Improves Safety Source: Multiple Sources including IPE submittals and ROP data for Mitigating System Performance Index Addressing IPE Insights Operational Efficiency, Plant Modifications, Risk Insights Maintenance Rule FLEX Implementation Factor of 20 YEAR INDUSTRY AVERAGE INTERNAL EVENTS CDF RELATIVE TO 1992
©2024 Nuclear Energy Institute 3 The Changing Role of PRA PRA Results DID &
Safety Margins =
Risk-Informed PRA Insights DID &
Safety Margins
=
Risk-Informed Current Fleet Framework A of Part 53/LMP*
DID &
Safety Margins PRA Results
- - LMP = Licensing Modernization Project
©2024 Nuclear Energy Institute 4 Large LWR PRA Advanced Reactor PRA Example Aspect of PRA Current Fleet Advanced Reactors Important Safety Systems Active Passive Equipment Reliability Data Plentiful Limited Human Actions for Accident Avoidance Many Few Accident Progression Uncertainties Limited Plentiful Modes of Operation At-Power All Hazard Sources Core All Predominant Risk Drivers Internal Hazards External Hazards Accepted Methods Nearly All Some Margin to Safety Goals Adequate Significant Useful Surrogate Risk Measures In Use Not Defined
©2024 Nuclear Energy Institute 5 PRA has been shown to be a valuable regulatory tool enabling:
Better safety focus & improved efficiency What we know today as risk-informed may be of little relevance for advanced reactors Changing the role of PRA must be undertaken with an appreciation for the strengths & limitations of the PRA models and a clear regard for uncertainties Closing Thoughts: