ML24155A006

RIC 2024 Maccsimize Safety

ML24155A006
Person / Time
Issue date:	03/14/2024
From:	NRC/RES/DSA/AAB
To:
Nazila H. Tehrani 301-415-3684
References
Download: ML24155A006 (10)

Text

RIC 2024 Hybrid MARCH 12-14, 2024

U.S. Nuclear Regulatory Commission #nrcric2024 36thAnnual Regulatory Information Conference www.nrc.gov

MACCSimize S a fe t y !

Office of Nuclear Regulatory Research Division of Systems Analysis Accident Analysis Branch

ADAPTING TO A CHANGING LANDSCAPE RIC 2024 Hybrid MARCH 12-14, 2024

U.S. Nuclear Regulatory Commission #nrcric2024 36thAnnual Regulatory Information Conference www.nrc.gov

What is the MACCS Consequence Analysis Code?

Overview The MACCS consequence analysis code was developed and is used to evaluate the offsite consequences of radioactive releases to the environment. MACCS models atmospheric transport, emergency and long-term protective actions, radioactive exposure pathways, dosimetry, health effects, and economic consequences.

• MACCS outputs capture a variety of metrics, including dose, health effects, fatality risk, economic losses, and land contamination.

• MACCS can be used for regulatory and cost-benefit analyses, environmental reports and impact statements, plant-specific evaluations of severe accident mitigation alternatives, U.S. Department of Energy documented safety analyses, probabilistic risk assessments, and numerous research studies.

ADAPTING TO A CHANGING LANDSCAPE RIC 2024 Hybrid MARCH 12-14, 2024

U.S. Nuclear Regulatory Commission #nrcric2024 36th Annual Regulatory Information Conference www.nrc.gov

Consequence analysis: A fundamental tenet of safety regulation

• A n important part of good regulation is estimating public consequence measures and using this knowledge to inform regulatory decisions.

• MACCS allows the NRC to estimate public consequence measures and provides a powerful tool to inform development of our regulations and guidance.

ADAPTING TO A CHANGING LANDSCAPE RIC 2024 Hybrid MARCH 12-14, 2024

U.S. Nuclear Regulatory Commission #nrcric2024 36th Annual Regulatory Information Conference www.nrc.gov

MACCS Users Community

• 857 MACCS Users

• Americas 556

• Asia 176

• Europe 120

• Africa 5

• 24 Cooperative Severe Accident Research Program (CSARP) Member Countries

• 149 Organizations

• Regulators, Researchers, Universities, and the Commercial Nuclear I ndustry

ADAPTING TO A CHANGING LANDSCAPE RIC 2024 Hybrid MARCH 12-14, 2024

U.S. Nuclear Regulatory Commission #nrcric2024 36th Annual Regulatory Information Conference www.nrc.gov

MACCS Code Development Activities MACCS/WinMACCS SecPop

• MACCS is the main executable of the computer code.

• Generates site data from Census information. The NRC The NRC released MACCS version 4.2 in March 2023. released SecPoP version 4.3.1 in July 2020.

• WinMACCS serves as the current user interface for

• SecPoP is being updated to include the 2020 US census data MACCS. The NRC released WinMACCS version 4.2 in and code improvement upgrades (expected by Fall 2024).

March 2023.

• The user interface is undergoing a modernization effort, MelMACCS which is expected to be completed by Summer 2024.

• Provides source term parameters to MACCS. The NRC MACCS-HYbrid Single-Particle Lagrangian Integrated released MelMACCS version 4.0 in September 2022.

Trajectory (HYSPLIT)

• MelMACCS is undergoing code improvement upgrades

• Provides capability to perform high-fidelity Lagrangian (expected by Winter 2024).

atmospheric transport modeling. The NRC released AniMACCS MACCS-HYSPLIT version 1.2 in March 2023.

• Provides animation of plume segments of MACCS. The NRC released MelMACCS version 1.3.1 in January 2022.

ADAPTING TO A CHANGING LANDSCAPE RIC 2024 Hybrid MARCH 12-14, 2024

U.S. Nuclear Regulatory Commission #nrcric2024 36th Annual Regulatory Information Conference www.nrc.gov

Modernizing the MACCS User Interface (MACCS-UI)

• The MA CCS-UI i s undergoi ng a moderni zati on effort wi th the key goal of ensuring long-term usabi li ty.

• The MA CCS-UI i s anti ci pated to offer a user i nterface and functi onali ti es aki n to Wi nMA CCS.

• The MA CCS-UI moderni zati on i s expected to be completed by Summer 2024.

ADAPTING TO A CHANGING LANDSCAPE RIC 2024 Hybrid MARCH 12-14, 2024

U.S. Nuclear Regulatory Commission #nrcric2024 36th Annual Regulatory Information Conference www.nrc.gov

MACCS Advanced Reactor Initiatives The MACCS development team is currently working on several advanced reactor initiatives to ensure that the MACCS code continues to meet regulatory needs for consequence analysis.

Item Phenomenological Areas 2019 2020 2021 2022 2023 2024 Reports

CA1 Atmospheric Transport and Dispersion (Nearfield Modeling) x x xSAND2021-6924

CA2 Radionuclide Release Screening x xSAND2022-12018 CA3 Radionuclide Release Screening (Atmospheric Transport x SAND2022-12766 and Dispersion & Dosimetry)

CA4 Dosimetry and Health Effects (Tritium Modeling) x x xSAND2022-12016

CA5 Radionuclide Evolution in Atmosphere x x I n progress

ADAPTING TO A CHANGING LANDSCAPE RIC 2024 Hybrid MARCH 12-14, 2024

U.S. Nuclear Regulatory Commission #nrcric2024 36th Annual Regulatory Information Conference www.nrc.gov

MACCS Advanced Reactor Initiatives Radionuclide Evolution in the Atmosphere (Task CA5)

Relevant Other Atmospheric Environmental Current MACCS Transport and Transformation Capabilities Dispersion Models Processes

• Chemical Reactions

• Radionuclide Decay and

• HYSPLI T

• Oxidation I ngrowth

• CMAQ

• Agglomeration

• Dry Deposition

• WRF-CHEM

• Hygroscopicity

• Wet Deposition

• SORAMI

• RASCAL

• RATCHET

ADAPTING TO A CHANGING LANDSCAPE RIC 2024 Hybrid MARCH 12-14, 2024

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MACCS Applications Supporting Other Emerging Areas

• Future Focused Research Activities

• The NRC is researching using National Centers for Env ironmental Prediction data to support sev ere accident consequence analysis at locations without onsite meteorological data.

• Env i ronmental Justi ce

• The NRC is planning to initiate research on how MACCS can use census data and other data sources to enable the reporting of community v ulnerability indices for populations around a site. The NRC also plans to re-ev aluate how MACCS models recov ery decisions in low-income areas.

• Radi onucli des A ccident Consequence A nalyses for Space Launch

• The United States is developing space nuclear systems where such systems safely enable or enhance space exploration or operational capabilities [NSPM-20].

ADAPTING TO A CHANGING LANDSCAPE RIC 2024 Hybrid MARCH 12-14, 2024

U.S. Nuclear Regulatory Commission #nrcric2024 36th Annual Regulatory Information Conference www.nrc.gov

Connect With Us PM MACCS Code Development & Applications Salman Haq, salman.haq@nrc.gov Nazila Tehrani, nazila.tehrani@nrc.gov

Code Distribution (MACCSCodes@nrc.gov)

A J Nosek, aj.nosek@nrc.gov

Branch Chief Lui s Betancourt, luis.Betancourt@nrc.gov

Visit us at: https://maccs.sandia.gov/maccs.aspx ADAPTING TO A CHANGING LANDSCAPE