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Initiation
- Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request
- Acceptance...
Administration
- Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, ... further results|Meeting]]
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MONTHYEARPMNS20211430, Pre-application Meeting with Terrapower to Discuss the Natrium Energy Island Decoupling2021-11-15015 November 2021
Pre-application Meeting with Terrapower to Discuss the Natrium Energy Island Decoupling
Project stage: Meeting
PMNS20211499, Pre-application Meeting with Terrapower to Discuss the the Methodology Used in Identifying the Risk-Informed, Performance-Based (RIPB) Principal Design Criteria (PDC)2021-11-23023 November 2021
Pre-application Meeting with Terrapower to Discuss the the Methodology Used in Identifying the Risk-Informed, Performance-Based (RIPB) Principal Design Criteria (PDC)
Project stage: Meeting
PMNS20211473, Pre-application Meeting with Terrapower to Discuss the Environmental Methodology for the Natrium Design2021-11-30030 November 2021
Pre-application Meeting with Terrapower to Discuss the Environmental Methodology for the Natrium Design
Project stage: Meeting
ML21340A1072021-12-0606 December 2021
Public Meeting Terrapower Natrium PDC Presentation
Project stage: Request
ML21314A1422022-01-10010 January 2022
Terrapower, LLC - Summary of September 28, 2021, Pre-application Public Meeting to Discuss the Site Selection Process for the Natrium Plant
Project stage: Meeting
ML22011A0722022-01-11011 January 2022
Terrapower Pre-Application Radiological Source Term Methodology Development Presentation
Project stage: Other
PMNS20211570, Pre-application Meeting with Terrapower to Discuss the Source Term Methodology Plans for the Natrium Design2022-01-12012 January 2022
Pre-application Meeting with Terrapower to Discuss the Source Term Methodology Plans for the Natrium Design
Project stage: Meeting
ML21362A6522022-02-14014 February 2022
Summary of November 17, 2021, Pre-application Public Meeting with Terrapower, LLC to Discuss the Natrium Reactor Energy Island Decoupling
Project stage: Meeting
ML21363A1762022-02-18018 February 2022
Summary of Pre-Application Public Meeting with Terrapower, LLC to Discuss the Digital Instrumentation and Control System for the Natrium Reactor
Project stage: Meeting
PMNS20220144, Pre-application Meeting with Terrapower to Discuss the Human Factors Engineering on Natrium Plant Design2022-02-18018 February 2022
Pre-application Meeting with Terrapower to Discuss the Human Factors Engineering on Natrium Plant Design
Project stage: Meeting
ML22074A2212022-03-11011 March 2022
Terrapower, LLC, Human Factors Engineering Program Presentation Material
Project stage: Request
ML22080A2562022-03-21021 March 2022
Terrapower Submittal of Functional Containment Presentation Material
Project stage: Request
ML21362A7632022-03-23023 March 2022
Summary of December 1, 2021, Pre-Application Public Meeting with Terrapower, LLC to Discuss the Environmental Methodology for the Natrium Reactor
Project stage: Meeting
PMNS20220148, Pre-application Meeting with Terrapower to Discuss the Natrium Plant Design Functional Containment2022-03-23023 March 2022
Pre-application Meeting with Terrapower to Discuss the Natrium Plant Design Functional Containment
Project stage: Meeting
ML22082A2222022-03-23023 March 2022
Terrapower Slide Presentation for Met Tower Water Supply Public Meeting
Project stage: Request
PMNS20220150, Pre-application Meeting with Terrapower to Discuss the Meteorological Data and Plant Water Source for the Natrium Plant Design2022-03-28028 March 2022
Pre-application Meeting with Terrapower to Discuss the Meteorological Data and Plant Water Source for the Natrium Plant Design
Project stage: Meeting
ML21348A7402022-03-30030 March 2022
Summary of Public Meeting to Discuss the Structures, Systems and Components Classification for the Natrium Reactor
Project stage: Meeting
PMNS20220357, Pre-application Meeting with Terrapower to Discuss the Human Factors Engineering on Natrium Plant Design2022-04-0505 April 2022
Pre-application Meeting with Terrapower to Discuss the Human Factors Engineering on Natrium Plant Design
Project stage: Meeting
ML22073A2762022-04-11011 April 2022
Summary of November 29, 2021, Closed Pre-Application Meeting with Terrapower, LLC to Discuss the Fuel Qualification Methodology for the Natrium Reactor
Project stage: Meeting
ML22082A2342022-04-11011 April 2022
Summary of January 13, 2022, Pre-Application Public Meeting with Terrapower, LLC to Discuss the Source Term Methodology Plans for the Natrium Reactor
Project stage: Meeting
ML22082A1392022-04-18018 April 2022
Summary of Public Meeting with Terrapower, LLC to Discuss the Methodology Used in Identifying the Principal Design Criteria
Project stage: Meeting
PMNS20220416, Pre-application Meeting with Terrapower to Discuss the Fuel Cycle Impacts on Natrium Plant Design2022-04-18018 April 2022
Pre-application Meeting with Terrapower to Discuss the Fuel Cycle Impacts on Natrium Plant Design
Project stage: Meeting
ML22112A1412022-04-21021 April 2022
Terrapower, LLC, Fuel Cycle: Environmental Impacts Meeting Material
Project stage: Request
PMNS20220482, Pre-Application Meeting with NRC and Terrapower to Discuss the Testing Plan and Methodology That Will Be Used for the Natrium Design2022-05-0909 May 2022
Pre-Application Meeting with NRC and Terrapower to Discuss the Testing Plan and Methodology That Will Be Used for the Natrium Design
Project stage: Meeting
ML22132A1522022-05-11011 May 2022
Terrapower Testing Program and Methodology Presentation Material
Project stage: Request
PMNS20220519, Pre-application Meeting with Terrapower to Discuss the Natrium Plant Overview2022-05-17017 May 2022
Pre-application Meeting with Terrapower to Discuss the Natrium Plant Overview
Project stage: Meeting
ML22144A4152022-06-13013 June 2022
Summary of March 15, 2022, and April 7, 2022, Closed Meetings with Terrapower, LLC to Discuss the Human Factors Engineering for Natrium Reactor
Project stage: Meeting
ML22189A2092022-07-20020 July 2022
March 30, 2022, Summary of Public Meeting with Terrapower, LLC to Discuss the Meteorological Data and Plant Water Source for the Natrium Reactor
Project stage: Meeting
ML22180A2692022-07-21021 July 2022
March 24, 2022, Summary of Pre-Application Public Meeting Between Terrapower, LLC and NRC Staff to Discuss the Natrium Reactor Functional Containment
Project stage: Meeting
ML22187A1062022-08-11011 August 2022
Summary of May 4, 2022, Closed Meeting with Terrapower, LLC to Discuss the Fuel Cycle Environmental Impacts for the Natrium Reactor
Project stage: Meeting
PMNS20220920, Pre-application Meeting with Terrapower to Discuss In-Vessel Instrumentation for the Natrium Reactor2022-09-0101 September 2022
Pre-application Meeting with Terrapower to Discuss In-Vessel Instrumentation for the Natrium Reactor
Project stage: Meeting
ML22263A0372022-09-19019 September 2022
Terrapower In-Vessel Instrumentation Presentation Material
Project stage: Request
PMNS20220921, Pre-application Meeting with Terrapower to Discuss the Consensus Codes and Standards on Natrium Plant Design2022-09-27027 September 2022
Pre-application Meeting with Terrapower to Discuss the Consensus Codes and Standards on Natrium Plant Design
Project stage: Meeting
ML22244A2432022-09-29029 September 2022
Summary of the May 23-25, 2022, Closed Pre-Application Public Meeting Between Terrapower, LLC and NRC Staff to Discuss an Overview of the Natrium Reactor
Project stage: Meeting
PMNS20220992, Pre-application Meeting with Terrapower to Discuss Metal Fuel Operating Experience on Natrium Plant Design2022-10-11011 October 2022
Pre-application Meeting with Terrapower to Discuss Metal Fuel Operating Experience on Natrium Plant Design
Project stage: Meeting
ML22262A3512022-10-13013 October 2022
Summary of Pre-Application Public Meeting with Terrapower, LLC to Discuss the Testing Plan and Methodology for the Natrium Reactor
Project stage: Meeting
ML22291A0012022-10-17017 October 2022
Terrapower, LLC, Emergency Planning Zone Sizing Methodology Presentation Material
Project stage: Request
PMNS20221094, Pre-application Meeting with Terrapower to Discuss Instrumentation and Control (I&C) Systems and Cyber Security for the Natrium Project2022-10-20020 October 2022
Pre-application Meeting with Terrapower to Discuss Instrumentation and Control (I&C) Systems and Cyber Security for the Natrium Project
Project stage: Meeting
ML22300A2642022-10-27027 October 2022
Terrapower I&C Regulatory Framework & Cyber Security Presentation Material
Project stage: Request
PMNS20221049, Pre-Application Meeting with NRC and Terrapower to Discuss Emergency Planning Zone (EPZ) Methodology2022-10-31031 October 2022
Pre-Application Meeting with NRC and Terrapower to Discuss Emergency Planning Zone (EPZ) Methodology
Project stage: Meeting
ML23025A1332023-01-25025 January 2023
PSAR Seismic Analysis and Seismic SSC Classification Approach
Project stage: Request
PMNS20230077, Pre-Application Meeting with Terrapower to Discuss the Partial Flow Blockage for the Natrium Design2023-01-30030 January 2023
Pre-Application Meeting with Terrapower to Discuss the Partial Flow Blockage for the Natrium Design
Project stage: Meeting
ML23040A1642023-02-0808 February 2023
Terrapower, LLC, Partial Flow Blockage Methodology Presentation Material
Project stage: Request
ML23031A0122023-02-14014 February 2023
Terrapower Summary of the September 29, 2022, Open Observation Pre-Application Meeting with Terrapower, LLC, to Discuss the Consensus Codes and Standards on the Natrium Plant Design
Project stage: Meeting
PMNS20230152, Pre-Application Meeting with NRC and Terrapower to Discuss the Fuel and Control Rod Performance Analysis and Fuel Qualification Plans on the Natrium Design2023-02-22022 February 2023
Pre-Application Meeting with NRC and Terrapower to Discuss the Fuel and Control Rod Performance Analysis and Fuel Qualification Plans on the Natrium Design
Project stage: Meeting
ML23066A3312023-03-0707 March 2023
Terrapower, LLC, Fuel and Control Assembly Qualification Presentation Material
Project stage: Request
PMNS20230154, Pre-Application Meeting with NRC and Terrapower to Discuss the Instrumentation and Controls (I&C) Defense-in-Depth and Diversity on the Natrium Design2023-04-11011 April 2023
Pre-Application Meeting with NRC and Terrapower to Discuss the Instrumentation and Controls (I&C) Defense-in-Depth and Diversity on the Natrium Design
Project stage: Meeting
ML23031A1162023-04-11011 April 2023
September 26, 2022, Summary of the Closed Meeting with Terrapower, LLC, Pre-Application Meeting with Terrapower to Discuss In-Vessel Instrumentation for the Natrium Reactor
Project stage: Meeting
2022-04-11
[Table View] |
Text
February 28, 2024 MEMORANDUM TO:
William T. Jessup, Chief Advanced Reactor Licensing Branch 1 Division of Advanced Reactors and Non-Power Production and Utilization Facilities Office of Nuclear Reactor Regulation FROM:
Roel A. Brusselmans, Project Manager /RA/
Advanced Reactor Licensing Branch 1 Division of Advanced Reactors and Non-Power Production and Utilization Facilities Office of Nuclear Reactor Regulation
SUBJECT:
SUMMARY
OF THE OCTOBER 17, 2023, PUBLIC MEETING WITH TERRAPOWER, LLC TO DISCUSS CONTROL ROOM HABITABILITY (EPID NO. L-2021-LRM-0071)
Meeting Information:
Applicant: TerraPower, LLC (TerraPower)
Project No.: 99902100 Public Meeting Notice Agencywide Documents Access and Management System (ADAMS)
Accession No.: ML23261A610 Applicant Presentation Slides: ML23289A021 Meeting Attendees: See the enclosure for a list of meeting attendees.
CONTACT:
Roel A. Brusselmans, NRR/DANU (301) 415-0829
W. Jessup 2
Meeting Summary:
On October 17, 2023, the U.S. Nuclear Regulatory Commission (NRC) staff held a public meeting with TerraPower to provide the NRC staff with an overview of how control room habitability is addressed for the Natrium design. Participants included representatives from TerraPower, Bechtel, General Electric Hitachi, and members of the general public. The NRC staff conducted the meeting in accordance with NRC Management Directive 3.5, Attendance at NRC Staff-Sponsored Meetings (ML21180A271).
The NRC staff began with introductions, a description of the meeting intent, and stated that the meeting was an observation-type public meeting. TerraPower gave an overview of the Natrium design including a discussion of project goals, plant overview, and graphics explaining the design. TerraPower explained the main control room (MCR) regulatory basis, habitability strategy, and remote shutdown facility specifics, including relative location and safety classification. TerraPower also described the heating, ventilation, and air conditioning (HVAC) design for both the MCR and remote shutdown facility. In addition, TerraPower also discussed relevant aspects of the radiological consequence analyses for postulated accidents.
The NRC staff discussed the potential future applicability of Title 10 of the Code of Federal Regulations (10 CFR) 50.34(f)(2)(xxvii). This regulation requires the evaluation of potential pathways for radioactivity and radiation that may lead to control room habitability problems under accident conditions resulting in an accident source term release and make necessary design provisions to preclude such problems.
The NRC staff asked questions about the applicability of the Kairos Hermes construction permit application discussion of building codes and the control room radiological habitability as a precedent for development of the TerraPower Natrium design and noted that Hermes is a non-power test reactor with different requirements than a commercial power reactor. The NRC staff also noted that the Kairos Hermes preliminary safety evaluation report (PSAR) did not describe the control room habitability radiological analysis nor whether control room HVAC design would be important for the Hermes; that discussion was instead deferred to the operating license application, so it may not be informative for TerraPowers habitability strategy.
The NRC staff asked questions about the Natrium MCR and HVAC system components safety classification and special treatment, and the locations of self-contained breathing apparatus and post-accident monitoring equipment. TerraPower responded that there is no safety related (SR) equipment in the MCR; all SR would be located below grade, including the reactor protection system (RPS). In response to an NRC staff question, TerraPower stated that there are two 50%
HVAC trains (classified as non-safety-related with special treatment (NSRST)), as typical for commercial use because the HVAC system does not need to manage accident heat load during normal operations and it is not required for accidents.
With respect to the discussion of the MCR dose assessment approach on Slide 37, the NRC staff stated that it is unusual to evaluate the control room dose for events other than the design basis accident, so the staff would have to consider the acceptability of this approach and asked if TerraPower had done a sensitivity analysis to look at the effect of using the design basis event source terms as compared to the design basis accident source term. TerraPower responded that it was looking at both types of source term. The NRC staff asked if the MCR dose analysis accounted for unfiltered inleakage and ingress/egress. TerraPower responded that the analysis does not credit MCR isolation or filtration, so it does not model inleakage. TerraPower further stated that other HVAC system modes of operation are considered to assess whether they are
W. Jessup 3
bounding to further ensure appropriate modeling of radionuclide build-up in the MCR.
The NRC staff asked if remote shutdown area (RSA) dose analyses are needed to show compliance with principal design criterion (PDC) 19. TerraPower responded that because operators are not expected to be that area, RSA dose analyses have not been performed for PDC 19.
TerraPower representatives and the NRC staff discussed the next steps for future interactions regarding the Natrium reactor design.
No regulatory decisions were made as a result of this meeting.
Enclosure:
List of Meeting Attendees cc: TerraPower Natrium via GovDelivery
W. Jessup 3
SUBJECT:
SUMMARY
OF THE OCTOBER 17, 2023, PUBLIC MEETING WITH TERRAPOWER, LLC TO DISCUSS CONTROL ROOM HABITABILITY (EPID NO. L-2021-LRM-0071)
DATED: FEBRUARY 28, 2024 DISTRIBUTION:
PUBLIC RidsNrrDanuUal1 Resource RidsNrrDanu Resource MSutton, NRR SDevlin-Gill, NRR DAtkinson, NRR RBrusselmans, NRR WJessup, NRR RAnzalone, NRR DGreene, NRR ANeller, NRR AHoward, OCFO BGleaves, NRR CCheung, NRR JSeymour, NRR JAshcraft, NRR MHart, NRR SJones, NRR ZGran, NRR RAlexander, RIV ADAMS Accession Number: [ML24059A153]
NRR-001 OFFICE NRR/DANU/UAL1:PM NRR/DANU/UAL1:PM NRR/DANU/UAL1:LA NRR/DANU/UAL1:BC NAME RBrusselmans MSutton DGreene WJessup DATE 10/31/2023 11/1/2023 11/1/2023 12/26/2023 OFFICE NRR/DANU/UAL1:PM NAME RBrusselmans DATE 02/28/2024 OFFICIAL RECORD COPY
Enclosure List of Meeting Attendees
SUMMARY
OF THE OCTOBER 17, 2023, PUBLIC MEETING WITH TERRAPOWER, LLC TO DISCUSS CONTROL ROOM HABITABILITY (EPID NO. L-2021-LRM-0071)
October 17, 2023 Name Organization Mallecia Sutton U.S. Nuclear Regulatory Commission (NRC)
Roel Brusselmans NRC Reed Anzalone NRC Alec Neller NRC Arlette Howard NRC Billy Gleaves NRC Calvin Cheung NRC Jesse Seymour NRC Joseph Ashcraft NRC Michelle Hart NRC Steve Jones NRC Zachary Gran NRC Ryan Alexander NRC Brendan McGregor TerraPower, LLC (TerraPower)
Christopher Forrest TerraPower Jeff Robertson TerraPower John Biersdorf TerraPower Jong Chang TerraPower Ryan Miller TerraPower Ryan Sprengel TerraPower Nick Kellenberger TerraPower Chris Courtenay TerraPower Matthew Presson TerraPower Serena Allison-Ptak Bechtel Steve Kline Bechtel Eric Pearson General Electric (GE) Hitachi Shane Gardner GE-Hitachi Tim Enfinger GE-Hitachi