ML20336A004
| ML20336A004 | |
| Person / Time | |
|---|---|
| Issue date: | 12/07/2020 |
| From: | Matthew Hiser, Mark Yoo Office of Nuclear Regulatory Research |
| To: | |
| M. Hiser | |
| References | |
| Download: ML20336A004 (18) | |
Text
NRC Public Workshop on Advanced Manufacturing Technologies for Nuclear Applications Matthew Hiser and Mark Yoo Office of Nuclear Regulatory Research December 7, 2020
Outline
- NRC Activities on Advanced Manufacturing Technologies (AMTs)
- 5 Primary Technologies
- Technical and Regulatory Preparedness
- Communications and Knowledge Management
- Public Workshop
- Overview and Approach
- Summary of Sessions
- Organization and Logistics 2
Advanced Manufacturing Technologies
- Techniques and material processing methods that have not been:
- Traditionally used in the U.S. nuclear industry
- Formally standardized/codified by the nuclear industry
- Key AMTs based on industry interest:
- Laser Powder Bed Fusion (LPBF)
- Direct Energy Deposition (DED)
- Electron Beam Welding
- Powder Metallurgy - Hot Isostatic Pressing (PM-HIP)
- Cold Spray 3
Laser Powder Bed Fusion
- Process:
- Uses laser to melt or fuse powder particles together within a bed of powder
- Generally most advantageous for more complex geometries
- Potential Applications Schematic of LPBF process*
- Smaller Class 1, 2 and 3 components, fuel hardware, small internals
Directed Energy Deposition
- Process:
- Wire or powder fed through nozzle into laser or electron beam
- Fundamentally welding using robotics/ computer controls Schematic of DED process*
- Potential Applications
- Similar to LPBF, although larger components due to faster production and greater build chamber volumes
Powder Metallurgy - Hot Isostatic Pressing (PM-HIP)
- Process:
- Metal powder is encapsulated in a form mirroring the desired part
- The encapsulated powder is exposed to high temperature and pressure, densifying the powder and producing a uniform microstructure
- After densification, the capsule is removed, yielding a near-net shape component where final machining and inspection can be performed
- Potential Applications
- All sizes of Class 1, 2 and 3 components and reactor internals
- EPRI / DOE focused on use with electron-beam welding to fabricate NuScale reactor vessel 6
Electron Beam Welding
- Process:
- Fusion welding process that uses a beam of high-velocity electrons to join materials
- Single pass welding without filler metal
- Welding process can be completed much more quickly due to deep penetration
- Potential Applications
- For welding medium and large components, such as NuScale upper head 7
Cold Spray
- Process:
- Powder is sprayed at supersonic velocities onto a metal surface and forms a bond with the part
- This can be used to repair existing parts or as a mitigation process Schematic of cold spray process*
- Potential Applications
- Mitigation or repair of potential chloride-induced stress corrosion cracking (CISCC) in spent fuel canisters
- Mitigation or repair of stress corrosion cracking (SCC) in reactor applications
- https://www.army.mil/article/148465/army_researchers_develop_cold_spray_system_transi 8 tion_to_industry
NRC Action Plan
- NRC activities related to AMTs have been organized and planned through the AMT action plan (Rev. 1 in June 2020 - ML19333B980) with the following objectives:
- Assess the safety significant differences between AMTs and traditional manufacturing processes, from a performance-based perspective.
- Prepare the NRC staff to address industry implementation of AMT-fabricated components through the 10 CFR 50.59 process.
- Identify and address AMT characteristics pertinent to safety, from a risk-informed and performance-based perspective, that are not managed or addressed by codes, standards, regulations, etc.
- Provide guidance and tools for review consistency, communication, and knowledge management for the efforts associated with AMT reviews.
- Provide transparency to stakeholders on the process for AMT approvals.
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Action Plan - Rev. 1 Tasks
- Task 1 - Technical Preparedness
- Technical information, knowledge and tools to prepare NRC staff to review AMT applications
- Task 2 - Regulatory Preparedness
- Regulatory guidance and tools to prepare staff for efficient and effective review of AMT-fabricated components submitted to the NRC for review and approval
- Task 3 - Communications and Knowledge Management
- Integration of information from external organizations into the NRC staff knowledge base for informed regulatory decision-making
- External interactions and knowledge sharing, i.e. AMT Workshop 10
Technical Preparedness Activities
- Subtask 1A: AMT Processes under Consideration
- Perform a technical assessment of multiple selected AMTs (Laser Powder Bed Fusion, Directed Energy Deposition, PM-HIP, EB-welding, and Cold Spray)
- Gap assessment for each selected AMTs vs traditional manufacturing techniques
- Subtask 1B: NDE Gap Assessment
- Assess the state of technologies in the testing and examination of AMTs
- Will inform staff decisions related to use of NDE on AMT-fabricated components
- Subtask 1C: Microstructural and Modeling
- Evaluate modeling and simulation tools used to predict the initial microstructure, material properties and component integrity of AMT components
- Identify existing gaps and challenges that are unique to AMT compared to conventional manufacturing processes 11
Regulatory Preparedness Activities
- Subtask 2A: Implementation using the 10 CFR 50.59 Process
- Provide guidance and support to regional inspectors regarding AMTs implemented under 50.59
- Subtask 2B: Assessment of Regulatory Guidance
- Assess whether any regulatory guidance needs to be updated or created to clarify the process for reviewing submittals with AMT components
- Complete: ML20233A693
- Subtask 2C: AMT Guidance Document
- Develop a report which describes the generic technical information to be addressed in AMT submissions
- Public meeting discussing initial framework was held July 30, 2020: https://www.nrc.gov/pmns/mtg?do=details&Code=20200816
- Meeting summary can be found here: ML20240A077 12
Communications and KM Activities
- Subtask 3A: Internal Interactions
- Internal coordination with NRC staff in other areas (e.g., advanced reactors, dry storage, fuels)
- Subtask 3B: External Interactions
- Engagement with codes and standards, industry, research, international
- Subtask 3C: Knowledge Management
- Seminars, public meetings, training, knowledge capture tools
- Subtask 3D: Public Workshop
- Subtask 3E: AMT Materials Information Course
- Internal NRC staff training 13
Workshop Overview
- Location/Dates: Virtual, December 7-10, 2020
- Motivation:
- Increasing industry interest and plans to implement AMTs for nuclear applications
- Replacement components in operating nuclear power plants and in initial construction of small modular and advanced reactors.
- NRC must be prepared to efficiently and effectively regulate and respond to industry submittals that apply AMTs for both operating and future plants.
- Participants
- Vendors, utilities, EPRI, NEI, DOD, DOE (incl. labs), NIST, NASA, regulators (other U.S. government, international) 14
Workshop Approach
- Goal is to have an interactive workshop with multiple opportunities for dialogue
- Q&A / discussion periods to end each session as well as secondary Teams chat following most presentations
- Objectives:
- Discuss ongoing activities related to AMTs, including nuclear industry implementation plans, codes and standards activities, research findings, and regulatory approaches in other industries
- Inform public of NRCs activities and approach to approving use of AMTs
- Determine, with input from nuclear industry stakeholders and other technical organizations, areas where NRC should focus to ensure safe implementation of AMTs 15
Workshop Sessions
- Session 1 - Practical Experience Related to Implementing AMTs
- Nuclear and non-nuclear industry experience with various AMTs
- Session 2 - Plans and Priorities for AMT Implementation in Commercial Nuclear Applications
- Nuclear industry plans and interests for using AMTs in NRC-regulated applications
- Session 3 - Performance Characteristics of AMT-Fabricated Components
- AMT-specific information related to processing and product performance 16
Workshop Sessions
- Session 4 - Approaches to Component Qualification and Aging Management
- Nuclear and non-nuclear perspectives on qualification of AMT components
- Session 5 - Codes and Standards Activities and Developments
- Session 6 - Regulatory Approaches for AMTs
- Nuclear, non-nuclear, and international regulatory approaches
- Session 7 - Research and Development of AMTs
- Information on key research programs and specific research projects related to AMTs 17
Workshop Organization
- WebEx will be used for the primary presentations and discussion sessions
- Please place questions in the chat window during the presentation and we will address as many as possible in the allotted time
- If you would like to ask your question verbally, please indicate through the chat, so that you can be upgraded temporarily to a panelist to be able to use audio functions
- A secondary Microsoft Teams link will be provided after most presentations to allow presenters to field additional Q&A for 20 minutes
- Simply click the link provided in the WebEx chat window to join the Teams chat and ask additional questions to the presenter.
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