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A Dislocation-Based Crystal Plasticity Model For Hexagonal Close-Packed Polycrystals, Omid Sedaghat 2022 The University of Western Ontario

A Dislocation-Based Crystal Plasticity Model For Hexagonal Close-Packed Polycrystals, Omid Sedaghat

Electronic Thesis and Dissertation Repository

Due to their low neutron absorption cross-section and good corrosion properties, zirconium and its alloys have been widely used as the structural material in the core of nuclear reactors. These alloys are exposed to an intensive neutron flux which may lead to dimensional instabilities and the degradation of the mechanical properties of the alloy over the service time of the reactor. The changes in deformation behavior and mechanical properties can be traced back to the formation, evolution, and interaction of the irradiation-induced microstructural defects, e.g., point defect clusters, dislocation loops, and complex dislocation line networks. However, the materials constitutive ...


Addressing Underground, Unmanned Threats: A Case Study Of Gpr Detecting Illegal Objects At Nuclear Facilities And Enhancing Subterranean Physical Protection Systems, Md. Shamsul Huda Sohel, Mohammad Khan, Dr. Debashis Datta 2022 University of Dhaka

Addressing Underground, Unmanned Threats: A Case Study Of Gpr Detecting Illegal Objects At Nuclear Facilities And Enhancing Subterranean Physical Protection Systems, Md. Shamsul Huda Sohel, Mohammad Khan, Dr. Debashis Datta

International Journal of Nuclear Security

In nuclear installations, any unmanned threat is unacceptable. Such threats are a major issue for the nuclear physical protection system (PPS). Although the PPS of a nuclear power plant (NPP) is well prepared to deal with threats above ground level, until now, a special PPS had never been developed for detecting and tackling underground threats. One example of such a threat is a weapon-carrying, unmanned object operated by remote. Using this technology, a terrorist could launch an attack and overcome security barriers. While a normal PPS would not detect the underground activities of a mobile object, a PPS using a ...


A Detailed Hydrodynamic Study Of The Split-Plate Airlift Reactor By Using Non-Invasive Gamma-Ray Techniques, Laith S. Sabri, Abbas J. Sultan, Hasan Shakir Majdi, Shadha K. Jebur, Muthanna H. Al-Dahhan 2022 Missouri University of Science and Technology

A Detailed Hydrodynamic Study Of The Split-Plate Airlift Reactor By Using Non-Invasive Gamma-Ray Techniques, Laith S. Sabri, Abbas J. Sultan, Hasan Shakir Majdi, Shadha K. Jebur, Muthanna H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

This study focused on detailed investigations of selected local hydrodynamics in split airlift reactor by using an unconventional measurements facility: computed tomography (CT) and radioactive particle tracking (RPT). The local distribution in a cross-sectional manner with its radial's profiles for gas holdup, liquid velocity flow field, shear stresses, and turbulent kinetic energy were studied under various gas velocity 1, 2 and 3 cm/s with various six axial level z = 12, 20, 40, 60, 90 and 112 cm. The distribution in gas-liquid phases in the whole split reactor column, the riser and downcomer sides, including their behavior at the ...


Geant4 Simulation For Radioactive Particle Tracking (Rpt) Technique, Ahmed A. Alghamdi, Thaar M. Aljuwaya, Abdullah S. Alomari, Muthanna H. Al-Dahhan 2022 Missouri University of Science and Technology

Geant4 Simulation For Radioactive Particle Tracking (Rpt) Technique, Ahmed A. Alghamdi, Thaar M. Aljuwaya, Abdullah S. Alomari, Muthanna H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

In the past two decades, the radioactive particle tracking (RPT) measurement technique has been proven to visualize flow fields of most multiphase flow systems of industrial interest. The accuracy of RPT, and hence the data obtained, depend largely on the calibration process, which stands here as a basis for two subsequent processes: tracking and reconstruction. However, limitations in the RPT calibration process can be found in different experimental constrains and in assumptions made in the classical Monte Carlo approach used to simulate number of counts received by the detectors. Therefore, in this work, we applied a GEANT4-based Monte Carlo code ...


Uranium 233: The Nuclear Superfuel No One Is Using, Maris Hanson 2022 Seattle University School of Law

Uranium 233: The Nuclear Superfuel No One Is Using, Maris Hanson

Seattle Journal of Technology, Environmental & Innovation Law

Nuclear power offers more energy in less physical space than solar and wind and yields more energy per pound than fossil fuels. However different nuclear fuels yield different waste profiles and create different beneficial products. Uranium 233 (U233) resists use in nuclear weapons, yields beneficial daughter products, and produces dramatically less of the most problematic waste products than Uranium 235 (U235). U233 results from reactions with Thorium, a plentiful, ubiquitous element currently considered waste from rare earth mines. Additionally, U233 functions well in a liquid fuel reactor resulting in safer, more efficient reactors than current solid fuel U235 or Plutonium ...


Design Of An Accelerator-Based Shielding Experiment At The Nasa Space Radiation Laboratory Relevant To Enclosed, Shielded Environments In Space, Lawrence H Heilbronn, Michael Sivertz, Adam Rusek, Charlie Pearson, Martha Clowdsley, Luis Castellanos, Natalie McGirl, Ashwin Srikrishna, Cary Zeitlin 2022 Brookhaven National Laboratory

Design Of An Accelerator-Based Shielding Experiment At The Nasa Space Radiation Laboratory Relevant To Enclosed, Shielded Environments In Space, Lawrence H Heilbronn, Michael Sivertz, Adam Rusek, Charlie Pearson, Martha Clowdsley, Luis Castellanos, Natalie Mcgirl, Ashwin Srikrishna, Cary Zeitlin

Faculty Publications and Other Works -- Nuclear Engineering

Recent calculations indicate that the dose equivalent in an enclosed, shielded environment in a galactic cosmic ray field will increase or remain unchanged when shielding thickness increases beyond 20 to 30 g/cm2. This trend is seen out to 100 g/cm2, beyond which calculations were not run since depths greater than this are not envisioned for human missions in deep space. If these calculations are accurate, then an optimal shielding thickness (or narrow range of thicknesses) exists, with important implications for spacecraft and habitat design. Crucially, the calculation reveals a minimum dose equivalent value that cannot be reduced with ...


There From The Beginning: The Women Of Los Alamos National Laboratory Supporting National And International Nuclear Security, Olga Martin, Laura McClellan, Octavio Ramos, Heather Quinn 2022 Los Alamos National Laboratory

There From The Beginning: The Women Of Los Alamos National Laboratory Supporting National And International Nuclear Security, Olga Martin, Laura Mcclellan, Octavio Ramos, Heather Quinn

International Journal of Nuclear Security

From the beginning of the Manhattan Project in the early 1940s, the women of what would become Los Alamos National Laboratory (LANL) worked in technical positions alongside their male counterparts, played a key role as computers, and worked in administrative jobs as secretaries, phone operators, bookkeepers, and on behalf of the U.S. Army in the Women’s Army Corps.

Throughout the history of the Laboratory, women experts at LANL helped establish and lead important national and international security programs, with careers in science, technology, engineering, and mathematics. Over time, the women of Los Alamos have come together under various ...


Performance Degradation Based On Importance Change And Application In Dissimilar Redundancy Actuation System, Yadong Zhang, Chao Zhang, Shaoping Wang, Rentong Chen, Mileta M. Tomovic 2022 Old Dominion University

Performance Degradation Based On Importance Change And Application In Dissimilar Redundancy Actuation System, Yadong Zhang, Chao Zhang, Shaoping Wang, Rentong Chen, Mileta M. Tomovic

Engineering Technology Faculty Publications

The importance measure is a crucial method to identify and evaluate the system weak link. It is widely used in the optimization design and maintenance decision of aviation, aerospace, nuclear energy and other systems. The dissimilar redundancy actuation system (DRAS) is a key aircraft control subsystem which performs aircraft attitude and flight trajectory control. Its performance and reliability directly affect the aircraft flight quality and flight safety. This paper considers the influence of the Birnbaum importance measure (BIM) and integrated importance measure (IIM) on the reliability changes of key components in DRAS. The differences of physical fault characteristics of different ...


The Role Of Nuclear Forensics For Determining The Origin Of Nuclear Materials Out Of Regulatory Control And Nuclear Security, Lekhnath Ghimire, Edward Waller 2022 Ontario Tech University (University of Ontario Institute of Technology)

The Role Of Nuclear Forensics For Determining The Origin Of Nuclear Materials Out Of Regulatory Control And Nuclear Security, Lekhnath Ghimire, Edward Waller

International Journal of Nuclear Security

The international community recognizes the rise in theft and illicit trafficking of nuclear materials and radioactive sources—for malicious use and nuclear terrorism—as a serious threat. That is why a well-developed nuclear forensics capability is an integral part of a robust nuclear security program and a key element of nuclear security infrastructure. Both pre- and post-detonation nuclear forensics are vital for controlling theft and illicit trafficking of nuclear materials, as well as identifying and tracing their sources. Nuclear forensics analysis and interpretation processes for nuclear security is a systematic process that includes: (1) sample collection and categorization techniques and ...


Developing Nuclear Security Capacity Of Indonesia’S Police And Security Officer: Lessons From Universitas Gadjah Mada’S Pilot Training, Susetyo Hario Putero Mr, Mondjo, Agus Budhie Wijatna, Sihana, Andang Widiharto, Nunung Prabaningrum, Anung Muharini, Widya Rosita, Ester Wijayanti, Alexander Agung, Haryono Budi Santosa, Kusnanto, Yudi Utomo Imardjoko, Faridah, Ferdiansjah 2022 Universitas Gadjah Mada, Indonesia

Developing Nuclear Security Capacity Of Indonesia’S Police And Security Officer: Lessons From Universitas Gadjah Mada’S Pilot Training, Susetyo Hario Putero Mr, Mondjo, Agus Budhie Wijatna, Sihana, Andang Widiharto, Nunung Prabaningrum, Anung Muharini, Widya Rosita, Ester Wijayanti, Alexander Agung, Haryono Budi Santosa, Kusnanto, Yudi Utomo Imardjoko, Faridah, Ferdiansjah

International Journal of Nuclear Security

Due to an increase in global nuclear security issues, there need to be improvements in human resources and security measures. The Republic of Indonesia is an archipelago country, which makes surveilling for nuclear security threats complicated. Recent radioactive material smuggling incidents proved that Indonesian police and security officers’ knowledge in nuclear security has been challenged and must be improved. In response, Universitas Gadjah Mada’s Nuclear Engineering Program composed a three-day pilot training program for local police and UGM's security officers in 2018. The objective of the training was to improve their capabilities in dealing with nuclear security issues ...


Effort And Prospective On Nuclear Security In Rok, Jung Soo Kim, Myung-Tak Jung, Kookheui Kwon, YoungWook Lee 2022 Korea Institute Nonproliferation And Control

Effort And Prospective On Nuclear Security In Rok, Jung Soo Kim, Myung-Tak Jung, Kookheui Kwon, Youngwook Lee

International Journal of Nuclear Security

As of July 2013, the Republic of Korea (ROK) has been operating a total of 23 nuclear power reactors at four sites with five new reactors under construction. In addition, the country has been planned to construct two more units at two candidate sites. But, at now, due to change the energy policy, only one candidate site has been constructed and one nuclear power plant has been decommissioned. Otherwise, ROK has also been exporting nuclear power plants to the United Arab Emirates (UAE) and building a research reactor to Jordan. These performances have made the nation’s nuclear industry by ...


Women In Nuclear Science & Technology In India: Challenges & Opportunities, Arpita Datta, Dr. Alpana Goel, Ashok Kumar Jain 2022 Amity Institute of Nuclear Science and Technology, Amity University Uttar Pradesh, Noida

Women In Nuclear Science & Technology In India: Challenges & Opportunities, Arpita Datta, Dr. Alpana Goel, Ashok Kumar Jain

International Journal of Nuclear Security

Women have been actively contributing toward frontline research and development of various advanced technologies in the nuclear domain and playing a crucial role in key positions. However, proportional representation of women in various decision-making positions at higher levels in politics, diplomacy, military affairs, science, and technology remains low, and most of these positions remain male-dominated. We see that women often find it difficult to achieve leadership roles for several reasons, but often from an implicit bias in society. The stereotypical image of women in society is still propagated very discreetly. In recent times, Indian women have made big strides in ...


Modeling Pa-233 Generation In Thorium-Fueled Reactors For Safeguards, Victoria Davis 2022 Virginia Commonwealth University

Modeling Pa-233 Generation In Thorium-Fueled Reactors For Safeguards, Victoria Davis

Theses and Dissertations

Thorium has been researched for many decades as a possible alternative to uranium nuclear fuel. Thorium can be implemented in many different reactor designs including pressurized water reactors (PWRs), pressurized heavy water reactors (PHWRs), and molten salt reactors (MSRs). Its abundance in the earth, decreased long-lived transuranic waste, and claims that there are fewer proliferation concerns contribute to the attractiveness of using thorium as alternative nuclear fuel. However, possible proliferation pathways have been noted and must be investigated, particularly the potential diversion of 233Pa which can then decay to 233U – special fissionable material that should be under International ...


Molten Salt Technologies For Advanced Nuclear Fuel Cycles And Molten Salt Reactors, Dimitris Killinger 2022 Virginia Commonwealth University

Molten Salt Technologies For Advanced Nuclear Fuel Cycles And Molten Salt Reactors, Dimitris Killinger

Theses and Dissertations

This dissertation provides five topics—an assessment of different monitoring and analytical techniques often cited in the literature for molten salt systems and designs for nuclear engineering applications. First, we explored commonly used materials for quasi-reference electrodes in molten chloride salts. Second, the limitations of the electrochemical analysis known as cyclic voltammetry due to the concentration of uranium(III) present were being investigated. Third, we provided an experimental assessment on the development of a spectroelectrochemical cell for interrogating various spectroelectrochemical techniques, namely chronoabsorptometry and chronofluorometry, and their limitations due to the presence of uranium(III) ions. Fourth, a study on ...


Analyses For The Production And Dosimetry Of Adding Uranium-232 As A Tracer To The Uranium Fuel Cycle, Joshua H. Rhodes 2021 University of Tennessee, Knoxville

Analyses For The Production And Dosimetry Of Adding Uranium-232 As A Tracer To The Uranium Fuel Cycle, Joshua H. Rhodes

Doctoral Dissertations

This dissertation is an examination of the use of uranium-232 as a tracer in nuclear fuel. Decay daughters from 232U, particularly thallium-208, produce high energy gamma rays that, when added to uranium, may increase detectability in case of theft or diversion, but are also hazardous in high quantities. Previous studies of the 232U decay chain are examined. This work will go in to a dosimetry study to determine how hazardous varying levels of 232U are, and how to efficiently produce 232U in sufficient quantities.

A dosimetry study was performed to determine the dose hazards due to ...


Nuclear Security Awareness Survey At A University, Marcia P. Robinson, Naomi German, Destiny B. White, Shraddha V. Rane, Jason Timothy Harris 2021 Purdue University - West Lafayette

Nuclear Security Awareness Survey At A University, Marcia P. Robinson, Naomi German, Destiny B. White, Shraddha V. Rane, Jason Timothy Harris

International Journal of Nuclear Security

The concept of assessing safety culture in an organization emerged with its application at the nuclear power industry and has expanded since then. An assessment of nuclear security, on the contrary, is still under-developed, especially at non-nuclear facilities, such as academic institutions and medical facilities. To identify the level of the awareness and understanding of credible nuclear and radiological threats, response preparedness, security culture, and the integrity of nuclear security systems among non-radioactive material users at a university setting; a campus-wide survey was deployed. A total of 3,336 non-radioactive material users, including students, faculty, and staff participated in the ...


Decomposition Approach To Parametric Nonconvex Regression; Nuclear Resonance Analysis, Jordan L. Armstrong 2021 University of Tennessee, Knoxville

Decomposition Approach To Parametric Nonconvex Regression; Nuclear Resonance Analysis, Jordan L. Armstrong

Masters Theses

Parameterized nonconvex regression is a difficult problem for any optimization solver packages, often resulting in approximations and linearizations of the problem in order to be able to arrive a solution, if the problem is even solvable at all. These changes to the initial problem are largely dependent upon having appropriate domain knowledge and still often times result in a sizable gap between the achieved solution and the best true solution. We propose a novel method of decomposing the global problem into small, overlapping windows. Thus, the independent windows are now solvable. Subsequently, we offer a novel, sequential method of parameter ...


Radiation Effects On Lithium Indium Diselenide Semiconductors As Neutron Imaging Detectors, Robert M. Golduber 2021 University of Tennessee, Knoxville

Radiation Effects On Lithium Indium Diselenide Semiconductors As Neutron Imaging Detectors, Robert M. Golduber

Masters Theses

The studies presented in this work aim to improve upon the knowledge base of lithium indium diselenide (LISe) semiconductors to understand how the material behaves in high radiation environments and refine the process of turning it into a neutron detector. LISe has great potential as neutron imaging detector because of the high neutron absorption efficiency of its enriched 6Li component and its ability to discriminate between gamma-rays and neutrons. Its ability to remain functional after being irradiated with large amounts of neutron fluence has been tested and the change in its electro-optical properties with relation to fluence has been ...


Space And Defense – Volume Twelve – Number Two – Summer 2021, Space and Defense Journal 2021 University of Nebraska at Omaha

Space And Defense – Volume Twelve – Number Two – Summer 2021, Space And Defense Journal

Space and Defense

No abstract provided.


Thin Safety Margin: The Sefor Super-Prompt-Critical Transient Experiments, Ozark Mountains, Arkansas 1970–1971, Jerry Havens, Collis Geren 2021 University of Arkansas, Fayetteville

Thin Safety Margin: The Sefor Super-Prompt-Critical Transient Experiments, Ozark Mountains, Arkansas 1970–1971, Jerry Havens, Collis Geren

Arkansas Scholarly Editions

Thin Safety Margin charts the history of SEFOR, a twenty-megawatt reactor that operated for three years in the rural Ozark Mountains of Arkansas as part of an internationally sponsored program designed to demonstrate the Doppler effect in plutonium-oxide-fueled fast reactors. Authors Jerry Havens and Collis Geren draw upon this history to assess the accidental explosion risk inherent in using fast reactors to reduce the energy industry’s carbon dioxide emissions.

If a sufficiently powerful fast-neutron explosion were to cause the containment of a reactor such as SEFOR’s to fail, the reactor’s radiotoxic plutonium fuel could vaporize and escape ...


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