ML22299A051
| ML22299A051 | |
| Person / Time | |
|---|---|
| Site: | 99902078 |
| Issue date: | 11/04/2022 |
| From: | David Drucker NRC/NRR/DNRL/NRLB |
| To: | Michael Dudek NRC/NRR/DNRL/NRLB |
| Shared Package | |
| ML22299A050 | List: |
| References | |
| Download: ML22299A051 (7) | |
Text
November 4, 2022 MEMORANDUM TO:
Michael I. Dudek, Chief New Reactor Licensing Branch Division of New and Renewed Licenses Office of Nuclear Reactor Regulation FROM:
David Drucker, Senior Project Manager /RA/
New Reactor Licensing Branch Division of New and Renewed Licenses Office of Nuclear Reactor Regulation
SUBJECT:
SUMMARY
OF THE PUBLIC MEETING TO DISCUSS THE NUSCALE US460 STANDARD DESIGN APPROVAL COMPREHENSIVE VIBRATION ASSESSMENT PROGRAM HELD SEPTEMBER 29, 2022 The U.S. Nuclear Regulatory Commission (NRC) staff conducted an observation public teleconference meeting with NuScale Power, LLC (NuScale), on September 20, 2022. The purpose of the meeting was to discuss NuScales US460 Standard Design Approval Application Comprehensive Vibration Assessment Program.
The meeting notice can be found in the Agencywide Documents Access and Management System (ADAMS) Accession No. ML22271A084. The meeting notice was also posted on the NRC public website.
CONTACT: David Drucker, NRR/DNRL 301-415-6233
Enclosed are the meeting agenda (Enclosure 1), list of attendees (Enclosure 2),
summary of the open session (Enclosure 3), and summary of the closed, proprietary session (Enclosure 4). The documents referenced during the discussion can be found under ADAMS accession nos. provided below.
NuScales presentation material for September 29, 2022, public meeting (open session)
ML22265A246 NuScales presentation material for September 29, 2022, public meeting (closed session)
ML22265A249 (non-public)
Docket No. 99902078
Enclosures:
- 1. Meeting Agenda
- 2. List of Attendees
- 3. Summary of Open Session
- 4. Summary of Closed, Proprietary Session cc w/encl.: NuScale Power LLC Listserv
PKG: ML22299A050 PUBLIC: ML22299A051 PROP: ML22305A633 (Enclosure 4: Proprietary Summary) *via email NRR-106 OFFICE DNRL/NRLB: PM DNRL/NRLB: LA DEX/EMIB: Sr. Mech Engr NAME DDrucker*
SGreen*
YWong*
DATE 10/19/2022 10/26/2022 10/25/2022 OFFICE DNRL/NRLB: PM DNRL/NRLB: BC DNRL/NRLB: PM NAME GTesfaye*
MDudek*
DDrucker*
DATE 11/03/2022 11/04/2022 11/04/2022
U.S. NUCLEAR REGULATORY COMMISSION OBSERVATION PUBLIC TELECONFERENCE WITH NUSCALE POWER, LLC (NUSCALE)
TO DISCUSS THE NUSCALE US460 STANDARD DESIGN APPROVAL COMPREHENSIVE VIBRATION ASSESSMENT PROGRAM AGENDA FOR PUBLIC MEETING September 29, 2022 2:00 p.m. - 4:00 p.m. EST OPEN Time Topic Led By 2:00 p.m. EST Introduction NRC 2:05 p.m. EST Discussion of Identified Topic NRC/NuScale 2:25 p.m. EST Opportunity for Public Comment Public/NRC 2:30 p.m. EST Open Portion Concludes CLOSED 2:30 p.m. EST Discussion of Identified Topic NRC/NuScale 4:00 p.m. EST Adjourn
OBSERVATION PUBLIC TELECONFERENCE WITH NUSCALE POWER, LLC (NUSCALE)
TO DISCUSS THE NUSCALE US460 STANDARD DESIGN APPROVAL COMPREHENSIVE VIBRATION ASSESSMENT PROGRAM September 29, 2022 List of Attendees Name Organization David Drucker NRC Brian Smith Mike Dudek Shanlai Lu Gregory Makar MJ Ross-Lee Leslie Terry John Tsao Ricky Vivanco Yuken Wong Steve Hambric, NRC contractor Olivia Hand NuScale Matt Skocik Hannah Rooks Gary Becker Fehmida Mesania Federico Perdomo Beth Dalick Stanton Scoma Liz English JJ Arthur Kevin Drost Tim McDonald Beth Dalick Melissa Bates US Department of Energy Sarah Fields Uranium Watch Note: All participated via teleconference.
U.S. NUCLEAR REGULATORY COMMISSION OBSERVATION PUBLIC TELECONFERENCE WITH NUSCALE POWER, LLC (NUSCALE)
TO DISCUSS THE NUSCALE US460 STANDARD DESIGN APPROVAL COMPREHENSIVE VIBRATION ASSESSMENT PROGRAM MEETING
SUMMARY
OF OPEN SESSION September 29, 2022 On September 29, 2022, the U.S. Nuclear Regulatory Commission (NRC) staff conducted an observation public teleconference meeting with NuScale Power, LLC (NuScale), to discuss:
NuScales Comprehensive Vibration Assessment Program (CVAP).
The public meeting commenced with opening remarks and an introduction of participants as well as an external stakeholder.
NuScale began its presentation on its CVAP (ML22265A246) by acknowledging the Department of Energy. NuScale then stated that the purpose of the meeting was to discuss updates to their CVAP from the Design Certification Approval (DCA) to the SDAA.
NuScale also stated that, as they did for the DCA, they plan to submit two technical reports in support of their CVAP (one discussing analysis and the other discussing measurement and inspection). Next, NuScale discussed the following five items and their importance to their CVAP:
Non-prototype classification of nth module o NuScale plans for nth module to be classified as non-prototype o Full inspections of the prototype will be performed after initial startup test program is completed o The future applicant who references the SDAA will make determination of whether startup instrumentation or full inspection will be pursued for nth module Startup instrumentation plan o Will be addressed in closed session Design progress updates o Will be addressed in closed session SG-density wave oscillation (DWO) resolution for vibration aspects o Cavitation and turbulent buffeting assessments for the inlet flow restrictor (IFR) are underway. Will require reconciliation with steam generator (SG)
IFR design and design transient when available; therefore, no results are presented today
2 o The following CVAP-related topics will be addressed in the CVAP technical reports:
Screening of IFR for leakage flow instabilities Cavitation and/or slug-flow loads on the IFR; concern for erosion Turbulent buffeting loads and wear for the IFR due to DWO Format of reported design analysis safety margins o Issue closed, preliminary results will be addressed in closed session Next, NRC staff was provided an opportunity to ask questions. The NRC staffs understanding is that the instrumentation in the DWO testing will not detect cavitation. The staff asked NuScale to consider evaluating the fluid and steam mixture condition during the SG tube IFR final design testing. NuScale responded that they will consider this.
The public was provided an opportunity to provide comments and ask questions. Sarah Fields, Uranium Watch, asked that the staff explain more about the question regarding cavitation. The staff stated: Inside the SG tube there is subcooled water and as the water heats it becomes steam. There is also a mixture of liquid and steam inside the SG tube. DWO may cause flow in the SG tube to reverse and go back through the IFRs and this may potentially cause cavitation.
NuScale is planning to conduct DWO testing. The DWO testing will demonstrate if DWO will occur and possibly whether reverse flow will occur. There is separate testing to qualify the SG tube IFRs. As a part of these qualification tests, NuScale may want to consider testing the mixture of liquid and steam conditions in the reverse flow direction.
The public session of the meeting concluded at 2:30 p.m. The NRC staff continued discussion with NuScale during a closed meeting to discuss proprietary information related to the topic.