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MACCS (MELCOR Accident Consequence Code System) User Guide -- Version 4.0

Leute, Jennifer E.; Walton, Fotini; Mitchell, Roger; Eubanks, Lloyd

The MELCOR Accident Consequence Code System (MACCS) is used by Nuclear Regulatory Commission (NRC) and various national and international organizations for probabilistic consequence analysis of nuclear power accidents. This User Guide is intended to assist analysts in understanding the MACCS/WinMACCS model and to provide information regarding the code. This user guide version describes MACCS Version 4.0. Features that have been added to MACCS in subsequent versions are described in separate documentation. This User Guide provides a brief description of the model history, explains how to set up and execute a problem, and informs the user of the definition of various input parameters and any constraints placed on those parameters. This report is part of a series of reports documenting MACCS. Other reports include the MACCS Theory Manual, MACCS Verification Report, Technical Bases for Consequence Analyses Using MACCS, as well as documentation for preprocessor codes including SecPop, MelMACCS, and COMIDA2.

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TYPE SAND Report YEAR 2021
DOIOSTI

Advanced Reactor Safeguards Program Roadmap

Cipiti, Benjamin B.

The Advanced Reactor Safeguards (ARS) program was established in 2020 as part of appropriations for the Advanced Reactor Demonstration Program (ARDP) through the Office of Nuclear Energy in the Department of Energy. The goal of this program is to help address near term challenges that advanced nuclear reactor vendors face in meeting domestic Material Control and Accountancy (MC&A) and Physical Protection System (PPS) requirements for U.S. construction. Existing regulations for safeguards and security, as outlined in the Code of Federal Regulations, were written for large light water reactors, and some of the requirements are not suited to smaller, safer advanced reactor designs. The ARS program seeks to remove roadblocks in the deployment of new and advanced reactors by solving regulatory challenges, reducing safeguards and security costs, and utilizing the latest technologies and approaches for robust plant monitoring and protection. Safeguards and Security by Design (SSBD), or the consideration of safeguards and security requirements early in the design process, is an overarching principle that guides this program. This roadmap discusses the goals of the ARS program, current research, and program plan for the next five years.

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TYPE Other Report YEAR 2021
DOIOSTI

OC6 Phase 1: Investigating the under-prediction of low-frequency hydrodynamic loads and responses of a floating wind turbine

Robertson, Amy; Gueydon, Sebastien; Bachynski, Erin; Wang, Lu; Jonkman, Jason; Alarcon, Daniel; Amet, Ervin; Beardsell, Alec; Bonnet, Paul; Boudet, Bastien; Brun, Cedric; Feron, Marie; Chen, Zheng; Forbush, Dominic; Galinos, Christos; Galvan, Joseph; Gilbert, Philippe; Gomez, Juan; Haudin, Florence; Hu, Zhiqiang; Le Dreff, Jean-Baptiste; Leimeister, Mareike; Lemmer, Frank; Li, Haoran; Mckinnon, Gill; Mendikoa, Inigo; Moghtadaei, Abdolmajid; Netzband, Stefan; Oh, Sho; Pegalajar-Jurado, Antonio; Nguyen, Minh Q.; Ruehl, Kelley M.; Schunemann, Paul; Shi, Wei; Shin, Hyunkyoung; Si, Yulin; Surmout, Florian; Trubat, Pau; Qwist, Jacob; Wohlfahrt-Laymann, Svenja

Abstract not provided.

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TYPE Conference Poster YEAR 2021
OSTI

AlGaN High Electron Mobility Transistor for Power Switches and High Temperature Logic

Klein, Brianna A.; Armstrong, Andrew A.; Allerman, A.A.; Nordquist, Christopher D.; Neely, Jason C.; Reza, Shahed; Douglas, Erica A.; Van Heukelom, Michael; Rice, Anthony; Patel, Victor J.; Matins, Benjamin; Fortune, Torben; Rosprim, Mary R.; Caravello, Lisa A.; Foulk, James W.; Pipkin, Jennifer R.; Abate, Vincent M.; Kaplar, Robert

Abstract not provided.

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TYPE Conference Presentation YEAR 2021
DOIOSTI

Uncertainty Analysis and Software Verification

Leyva, Nha T.A.H.

Uncertainty analyses are an important part of calibrations and testing. They allow researchers insight on how to reduce and mitigate errors in testing. Each device used in testing introduces error in a system, as well as other sources such as environmental conditions, electronics, analog to digital, and random errors. Each source is carefully examined to identify how much error it introduces to a system. These sources are then combined using various methods of uncertainty calculations. To verify and validate software, a manual calculation is required to ensure the software is performing as intended. Using Excel to verify the calculations, we can identify discrepancies within the software. The root of the sum of the squares uncertainty (RSS) is used to find the combined uncertainty of a device at one and two standard deviations of the mean. Calibrations on accelerometers are performed using a vibration system along with a back-toback reference accelerometer. The vibration system takes a reference point at 100Hz frequency at 10g amplitude. The sensitivities are collected at each dialed in frequency. The sensitivity of the device represents the electrical output of the UUT (mV, pC, etc.) per unit of acceleration (g). The full history of sensitivities of selected accelerometers are used to find the averaged, standard deviation, and uncertainty of the device at each frequency tested. The uncertainty calculations from excel and the software are then compared.

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TYPE Other Report YEAR 2021
DOIOSTI
Results 11601–11700 of 99,299
Results 11601–11700 of 99,299
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