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Category:Slides and Viewgraphs
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2024-02-14
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Text
Long Term Operation NRCs Current Research on Concrete U.S. Nuclear Regulatory Commission Office of Nuclear Regulatory Research Division of Engineering January 21, 2021
Outline Regulatory Research for Long-Term Operation (LTO)
Radiation Effects on Structures
- NRCs Confirmatory Research
- NRC-DOE-EPRI Joint Research Activities
- Harvesting Opportunities for Irradiated Concrete
- Other External Collaborations
Regulatory Research for LTO RES Mission To provide technical advice, tools, and information for meeting the NRCs mission, including resolving safety and security issues, making regulatory decisions, and promulgating regulations and guidance.
Objectives
- Provide technical bases for generic guidance (vs. plant-specific)
- Inform future revisions to SLR guidance (e.g., Interim Staff Guidance developments)
- Continue focus on aging management for systems, structures and components into LTO 3
NRCs Confirmatory Research (1/3)
Research Drivers
- NUREG/CR-7153 (EMDA Report) Vol 4, Aging of Concrete and Civil Structures, identifies radiation effects on concrete as low-knowledge but high significance
- Knowledge has improved but further research 2 can help address future technical issues and uncertainties
- Structures exposed to radiation are inaccessible for inspection.
- Be Ready for advanced/newer technologies and regulatory implications 4
4
NRCs Confirmatory Research (2/3)
NRCs Confirmatory Research Activities
- State of knowledge on radiation-induced concrete degradation and its implications on NPP structures, Argonne National Laboratory (ANL), Report February 2020 (NUREG/CR to be published)
- Review and feedback on selected EPRI reports (2017-2018)
- Radiation evaluation methodology for concrete structures, Oak Ridge National Laboratory (ORNL), Report in June 2020, NUREG/CR to be published
- Development of theoretical models to predict properties of radiation damaged concrete, ANL and the University of Colorado, Report in December 2020
- In-house assessment of damage extension and structural capacity (2019 - 2023) 5
NRCs Confirmatory Research (3/3)
NRCs Confirmatory Research Activities Perform limited testing, modeling and numerical simulations of irradiated concrete behavior (including concrete-steel bonding) and develop methodology for structural evaluation at ORNL (2019 - 2023)
- Develop and conduct an experimental scoping study at LVR-15, Czech Republic to characterize the effects of irradiation on the bond properties of steel rebar in concrete
- Develop and validate a modeling methodology to assess the effects of irradiation on reinforced concrete biological shields in light water reactors
- Study size effect and develop a upscaling modeling strategy to verify applicability and significance of small-scale accelerated experimental data at the structural level
- Investigate rate effect (JEEP-II vs. LVR-15) 6
NRC-DOE-EPRI Joint Research Future focus areas
- Modeling of concrete damage mechanisms Confinement effects, steel-concrete bonding, cyclic loads, rate effects, scale effects (small specimen to structural scale), creep effects.
- Opportunities for harvesting and testing of concrete samples from decommissioned nuclear power plants for confirmation of regulatory research
- Methods for inspection/monitoring for the bio-shield and reactor vessel support structures 7
Harvesting Opportunities for Irradiated Concrete
- Ex-plant irradiated concrete is extremely valuable for confirmatory testing and for reducing uncertainties (concrete has been exposed to actual in-service plant operating conditions)
- Opportunity for harvesting irradiated concrete from the San Onofre Nuclear Generating Station (SONGS) has re-emerged
- NRC, ORNL, and EPRI technical coordination and planning for harvesting and research has started 8
External Collaborations
- Memoranda of Understanding with DOE and EPRI
- Bilateral and multilateral agreements
- International Committee on Irradiated Concrete
- Strategic international partnerships
- France, Japan, Canada
- IGALL, SALTO, TSO
- VERCORS
- ASCET 3
9
Summary
- NRC/RES will continue collaboration with DOE and EPRI on concrete research to reduce regulatory uncertainty.
- Leveraging stakeholders helps facilitate regulatory research supporting safety during LTO.
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