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MONTHYEARNRC 2017-0017, License Amendment Request 278, Risk-Informed Approach to Resolve Construction Truss Design Code Nonconformances2017-03-31031 March 2017
License Amendment Request 278, Risk-Informed Approach to Resolve Construction Truss Design Code Nonconformances
Project stage: Request
ML17202G5912017-07-25025 July 2017
Audit Plan and Setup of Online Reference Portal for License Amendment Request - Risk-Informed Approach to Resolve Construction Truss Design Code Nonconformances
Project stage: Other
NRC 2017-0039, Construction Truss License Amendment Request Audit Plan2017-08-10010 August 2017
Construction Truss License Amendment Request Audit Plan
Project stage: Request
ML17307A0402017-10-30030 October 2017
E-mail Draft Request for Additional Information for Containment Dome Truss LAR - Point Beach Nuclear Plant, Units 1 and 2 (CAC Nos. MF9532 and MF9533; EPID L-2017-LLA-0209)
Project stage: Draft RAI
ML17303A5422017-10-30030 October 2017
NRR E-mail Capture - Draft RAIs for Containment Dome Truss LAR - Point Beach Nuclear Plant, Units 1 and 2 - MF9532/33 - L-2017-LLA-0209
Project stage: Draft RAI
ML17319A2272017-11-17017 November 2017
Audit Plan for License Amendment Request to Resolve Non-Conformances Relating to Containment Dome Truss
Project stage: Other
ML17346A9122017-12-22022 December 2017
Summary of November 14, 2017 Public Teleconference with NextEra Energy Point Beach, LLC, to Discuss Containment Dome Truss License Amendment Request for Point Beach Nuclear Plant, Unit Nos. 1 and 2 (CAC Nos. MF9532 and MF9533; EPID L-2017-L
Project stage: Meeting
ML17363A2532017-12-29029 December 2017
Updated Final Response to NRC Generic Letter 2004-02
Project stage: Request
ML18025C0432018-01-31031 January 2018
Request for Additional Information Regarding License Amendment Request to Resolve Nonconformances Relating to Containment Dome Truss
Project stage: RAI
ML18038A7852018-03-0606 March 2018
Summary Report for NRC Audit for Point Beach Nuclear Plant, Units 1 and 2, License Amendment Request to Resolve Nonconformance Relating to Containment Dome Truss
Project stage: Other
NRC 2018-0001, Transmittal of Construction Truss License Amendment Request Document2018-04-12012 April 2018
Transmittal of Construction Truss License Amendment Request Document
Project stage: Request
NRC 2018-0014, NextEra Energy Point Beach, LLC, Construction Truss License Amendment Request 278, Response to Request for Additional Information2018-04-12012 April 2018
NextEra Energy Point Beach, LLC, Construction Truss License Amendment Request 278, Response to Request for Additional Information
Project stage: Response to RAI
NRC 2018-0030, Construction Truss License Amendment Request 278 Draft Updated Final Safety Analysis Report (UFSAR) Revision2018-05-29029 May 2018
Construction Truss License Amendment Request 278 Draft Updated Final Safety Analysis Report (UFSAR) Revision
Project stage: Draft Request
ML18179A4032018-06-29029 June 2018
Public Meeting Discussion Points
Project stage: Meeting
ML18213A3912018-07-12012 July 2018
Public Meeting
Project stage: Request
ML18214A1532018-08-0101 August 2018
NRR E-mail Capture - Final - Second Round RAIs - Point Beach Nuclear Plant, Units 1 and 2 - License Amendment Request to Resolve Non-conformances Relating to Containment Dome Truss - EPID L-2017-LLA-0209
Project stage: RAI
ML18220B0192018-08-13013 August 2018
7/12/2018 Summary of Meeting with NextEra Energy Point Beach, Llc. to Discuss Supplemental Response to the RAI for Containment Dome Truss License Amendment Request for Point Beach Nuclear Plant, Unit 1 and 2 (CAC Nos. MF9532 & MF9533; .
Project stage: RAI
ML18242A6062018-08-30030 August 2018
NextEra Energy Point Beach, LLC, Exemption Request to Support Updated Final Response to NRC Generic Letter 2004-02
Project stage: Other
NRC 2019-0007, License Conditions and Implementation Items Required to Resolve Construction Truss Design Code Nonconformances2019-03-13013 March 2019
License Conditions and Implementation Items Required to Resolve Construction Truss Design Code Nonconformances
Project stage: Request
ML18345A1102019-03-26026 March 2019
Redacted Version, Issuance of Amendment Nos. 263 and 266 for Risk-Informed Approach to Resolve Construction Truss Design Code Nonconformances
Project stage: Approval
2018-03-06
[Table View] |
Text
CONSTRUCTION TRUSS License Amendment Request Point Beach Nuclear Plant Units 1 & 2 Public Meeting July 12th 2018
1
AGENDA
- Changes made since Nov 2017 audit
NextEra Personnel
- Steve Catron Corporate Licensing
- Eric Schulz Point Beach Licensing
- Rich LaPlante Point Beach Engineering
- Ted Kulczycky Corporate PRA
PURPOSE
- Provide overview of changes made to seismic and thermal hazard analysis.
- Summarize results of independent review.
Changes Made Since the Audit In Nov 2017 CAFTA based event trees and fault trees used to assess seismic and thermal hazards.
Integrated Internal Events Model into seismic and thermal hazard models.
- Open findings addressed in Attachment A of PRA analysis. Most dispositioned as no impact, conservative impact, or addressed with sensitivity analysis.
Seismic fragilities from IPEEE.
- Some IPEEE fragilities updated. Addressed modifications made to the plant post IPEEE based on IPEEE insights.
Commitment to modification that will fully protect U2 PORV control cables from missile hazards - spring 2020.
HEPs based on latest EPRI methodology.
Quantified LERF based on bounding or conservative qualitative and quantitative assumptions related to containment integrity post construction truss failure.
Comprehensive sensitivity studies address key uncertainties. Followed guidance in RG 1.174 and NUREG 1855.
Summary of third party review Review Scope
Overall methodology and results
Bounding Analysis
Demonstrably Conservative Analysis
HRA
Conformance to RG 1.174; defense in depth, safety margin, and risk acceptance guidelines.
Conformance to RG 1.200 - high level review.
Reasonableness of assumptions and inputs.
Appropriate integration of structural inputs.
Appropriate integration of internal events model and Seismic IPEEE.
Uncertainty
Conformance to NUREG 1855 guidance
Confirm sensitivity studies address key uncertainties.
Key Comments
Innovative approach supported with good arguments that justify methodology.
Confirmed key issues addressed appropriately.
Editorial comments helped clarify methodology for reviewers.
Validated assumptions were reasonable and well supported.
Recommended additional sensitivity analyses to address key uncertainties associated with quantitative and qualitative inputs and assumptions.
Supporting HRA documentation enhanced in conjunction with limited quantification revision
No changes required to model structure
Clarifications made on seismic/structural inputs
ALL COMMENTS INCORPORATED OR RESOLVED.
6 INDEPENDENT REVIEW
Point Beach ALL HAZARDS PRA Results HAZARD CDF (1/Rx Yr)
LERF (1/Rx Yr)
Unit 1 Unit 2 Unit 1 Unit 2 TOTAL 7.2E-05 8.2E-05 2.3E-06 2.5E-06 RESULTS NRC RG 1.174 FIGURE 4 TOTAL CDF - ALL HAZARDS NRC RG 1.174 FIGURE 5 TOTAL LERF - ALL HAZARDS Case CDF LERF Bounding 1.93E-06 7.55E-07 Demonstrably Conservative 2.19E-07 5.26E-08
CONCLUSION
- PRA Identified mods that will protect critical mitigating functions during seismic and thermal events.
- Supporting evaluations based on bounding and conservative assumptions
- PRA quality meets RG 1.200
- Open F&O impacts will be addressed
- Independent reviews from industry experts confirmed validity of methodology and assumptions.
QUESTIONS Questions
