ML21025A003

Risk-Informed Process for Evaluations (RIPE) - NEI Public Meeting Presentation Slides

ML21025A003
Person / Time
Site:	Palo Verde
Issue date:	01/26/2021
From:	Anderson V, Mauer A Nuclear Energy Institute
To:	Plant Licensing Branch IV
Lingam S, NRR/DORL/LPL4, 301-415-1564
Shared Package
ML20025A005	List: ML21025A003
References
EPID L-2019-LRO-0074
Download: ML21025A003 (11)

Text

Public Meeting on Risk-Informed Process for Evaluations Andrew Mauer Technical Advisor Victoria Anderson Technical Advisor January 26, 2021

©2021 Nuclear Energy Institute

Introduction Industry appreciates the continued effort to focus NRC and licensee resources on the most safety significant issues RIPE and the VLSSIR process are viewed as examples of the NRC becoming a modern, risk-informed regulator We look forward to providing input over the course of this year to realize and maximize the use of these processes across the NRC

©2021 Nuclear Energy Institute 2

Insights Regarding RIPE Process Development of streamlined licensing actions using a risk-informed approach is appropriate We appreciate the significant amount of effort that went into complete the initial phase of RIPE and for your consideration of stakeholder comments

• Industry will be issuing RIPE IDP guidance and completing a submittal template We also appreciate the NRCs acknowledgement and commitment to expanding the use of RIPE to allow use by licensees with TS-425

©2021 Nuclear Energy Institute 3

Comparison of PRA Acceptability by Program Increasing External Internal Internal Fire PRA Hazards Events PRA PRA PRA Rigor Capability Qualitative Qualitative RIPE Category I of N/A of N/A (Screening)

Capability Qualitative/ Qualitative/

TSTF-425 Category II Bounding Bounding Site specific (Qualitative/

Capability Capability TSTF-505 Bounding or Category II Category II Capability Category II

Concept For RIPE Using TS-425 Example 1: Issue Involving Seismic Considerations Licensee risk informed application status

• TSTF-425 approved

• Submitted quantitative seismic risk evaluation 50.54(f) resolution

• 50.69 approved (no fire or seismic model used)

Can RIPE be used?

• Yes What should be referenced in RIPE submittal?

• TSTF-425 LAR and SE

• Quantitative seismic risk evaluation for 50.54(f) resolution

• Description of seismic and internal events findings not closed in a formal finding closure

Example 2: Issue Involving Fire Considerations Licensee risk informed application status

• TSTF-425 approved

• NFPA 805 approved and implemented Can RIPE be used?

• Yes What should be referenced in RIPE submittal?

• TSTF-425 LAR and SE

• NFPA 805 LAR and SE

• Description of fire and internal events findings not closed in a formal finding closure

Example 3: Issue Involving External Flood Considerations Licensee risk informed application status

• TSTF-425 approved

• NFPA 805 approved and implemented Can RIPE be used?

• No

PRA Technical Adequacy Documentation for RIPE Plant with TSTF-505 Plant with TSTF-425 PRA Scope used in IDP Describe for the specific submittal evaluation PRA Scope for Describe scope of Describe scope of PRA from Approved PRA from TSTF-505 TSTF-425 Application Applications Application Describe scope of PRA from other applications, if applicable PRA Technical Reference TSTF-505 Reference TSTF-425 LAR and SE Adequacy for LAR and SE Internal Events PRA Technical Reference TSTF-505 Reference TSTF-425 LAR and SE Adequacy for LAR and SE Reference LAR and SE from other Other PRAs applications, if applicable Status of Open Articulate any open peer review Findings N/A findings from relevant PRA models above

Next Steps Complete revisions to RIPE to allow use of TS-425 under a streamlined review process Identify lead plant to use RIPE process Continued use of VLSSIR process, as appropriate Begin a dialogue on expansion of RIPE to issues not quantitatively evaluated in a PRA

©2021 Nuclear Energy Institute 10

Conclusion We appreciate the NRCs risk-informed approach to address issue of low safety significance which helps focus NRC and licensee resources on the most safety significant issues.

©2021 Nuclear Energy Institute 11