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Local and global sensitivity analyses on the overflow probability of Abadia de Goiás radioactive near surface repository

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nuclear engineering and Design 2025年 439卷

作者： Teixeira, D.G. Frutuoso e Melo, P.F. Alvim, L.G.M. Alvim, A.C.M. Alves, A.S.M. Graduate Program of Nuclear Engineering COPPE Federal University of Rio de Janeiro RJ Rio de Janeiro Brazil Department of Computer Science Multidisciplinary Institute Federal Rural University of Rio de Janeiro UFRRJ RJ Nova Iguaçu Brazil Eletronuclear S. A. RJ Rio de Janeiro Brazil

This work presents a sensitivity analysis of the overflow probability of the near- surface radioactive repository built after the Abadia de Goiás accident, where radioactive 137Cs was released. The purpose of the analysis is to help the repository owner and the regulatory body make decisions on design parameters that affect the overflow probability. The following parameters have been considered: degradation function of the repository ceiling, internal porosity of the repository, internal area of the repository base, repository base and wall thicknesses, repository height, height of the liquid column inside the repository, average rainfall rate, evapotranspiration rate, surface runoff and hydraulic conductivity of the repository concrete. The choice for the range of each parameter is discussed. An investigation of the role of the mentioned parameters is detailed based on results obtained in a previous paper, and the dependencies among the rate parameters on the average rainfall rate is emphasized and modeled. To give a deeper perspective, local and global sensitivity analyses have been performed. In the case of global analysis, two approaches have been followed: in the first, the concept of Normalized Mutual Information and the other one leverages Shapley values derived from Light Gradient Boosting Machine and Shapley values have been used for investigating non-linearities. For some parameters the lowest values are to be considered, e.g., the repository base thickness and the average rainfall rate, while for others the highest value is desirable, like the evapotranspiration rate and the surface runoff in order to obtain lower overflow probabilities. These results should be looked with care because nonlinearities have been identified by the Shapley value analysis. Overall, the degradation function and the evapotranspiration rate emerge as the most influential parameters. The legacy of this work lies in the robust methodological framework it provides, paving the way fo

关键词： nuclear reactor accidents

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Reverse application of the Andrews protocol for assessing risks in a hypothetical nuclear accident

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nuclear engineering and Design 2025年 441卷

作者： Angelica C. Nogueira Hugo F. Menossi Rafael M. Hespanhol Andre C. Tavares Rodrigo C. Curzio Tercio Brum Edson R. Andrade Nuclear Engineering Graduate Program Military Institute of Engineering (IME) Rio de Janeiro Brazil Universidade do Oeste Paulista (UNOESTE) São Paulo Brazil Engineering Department Charleston Southern University North Charleston SC USA Herschend School of Education Gordon College Wenham MA USA Defense Engineering Graduate Program Military Institute of Engineering (IME) Rio de Janeiro Brazil University of Brasilia (UnB) Faculty of Science and Technology in Engineering Gama Distrito Federal Brazil Institute of Advanced Studies (IEAv) Brazilian Air Force São Paulo Brazil

This study introduces a novel approach to assessing radiobiological damage by employing an inverted version of the classical Andrews protocol (or Andrews nomogram) within the context of nuclear accidents. The methodology consists of two stages of computational simulation: The first stage simulates the release of radioactive materials from a pressurized water reactor (PWR), concentrating on scenarios of operational instability. In contrast, the second stage utilizes HotSpot Health Physics software to model the environmental dispersion of these materials. By estimating Total Effective Dose Equivalents (TEDE) at various locations and under different atmospheric stability conditions, we reverse the traditional sequence of the Andrews nomogram, which typically estimates lymphocyte counts based on radiation dose exposure. This innovative framework facilitates the development of a TEDE versus a Count curve, thereby enhancing the ability to anticipate the health implications following radiological incidents. The results highlight the importance of accurate modeling in predicting biological effects on populations exposed to radioactive releases and provide a tool to support responses and help design coping strategies enhancing the situational awareness of healthcare teams in nuclear emergencies.

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Neutronic and Proliferation Resistance Analysis of Small Modular Pressurized Water Reactor with Various Fuel Types using SRAC 2006 10

Neutronic and Proliferation Resistance Analysis of Small Mod...

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10th Asian Physics Symposium 2023, APS 2023

作者： Amatullah, Amila Permana, Sidik Pramuditya, Syeilendra Master Program in Nuclear Science and Engineering Faculty of Mathematics and Natural Sciences Bandung Institute of Technology Ganesha No. 10 Bandung Indonesia Graduate Program in Nuclear Science and Engineering Faculty of Mathematics and Natural Sciences Bandung Institute of Technology Ganesha No. 10 Bandung Indonesia Graduate Program in Physics Faculty of Mathematics and Natural Sciences Bandung Institute of Technology Ganesha No. 10 Bandung Indonesia

One strategy for emission reduction in Indonesia is the dedieselization program, replacing diesel power plants with renewables. Pressurized Water Reactor (PWR) type Small Modular Reactor (SMR) is also a consideration. This study aims to compare fuel performance in SMRs. Four fuel types with varying fissile and fertile nuclides but equal fissile mass percentages were assessed: U235- U238, U235-Th232, U233-U238, and U233-Th232, using PIJ SRAC 2006 and JENDL 4.0. Parameters include neutron multiplication factor, conversion ratio, and isotope production. Results indicated that U233-U238 has a highest initial neutron multiplication factor, 1.55. Substituting uranium-238 with thorium-232 boosts neutron flux and conversion, reducing nuclear proliferation risk. While initial neutron multiplication may not be highest, thorium-232 can produce uranium-233 with high initial neutron multiplication factor. This research aids fuel selection for Indonesia SMR dedieselization program. © Published under licence by IOP Publishing Ltd.

关键词： Thorium

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Electron spin dynamics guide cell motility

arXiv

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arXiv 2025年

作者： Wang, Kai Gilmer, Gabrielle Araña, Matheus Cândia Iijima, Hirotaka Bergmann, Juliana Woollard, Antonio Mesits, Boris McGraw, Meghan Zoltowski, Brian Cappellaro, Paola Ungar, Alex Pekker, David Waldeck, David H. Saxena, Sunil Lloyd, Seth Ambrosio, Fabrisia Discovery Center for Musculoskeletal Recovery Schoen Adams Research Institute at Spaulding BostonMA United States Department of Physical Medicine & Rehabilitation Spaulding Rehabilitation Hospital BostonMA United States Department of Physical Medicine & Rehabilitation Harvard Medical School BostonMA United States Cellular and Molecular Pathology Graduate Program University of Pittsburgh PittsburghPA United States Medical Scientist Training Program School of Medicine University of Pittsburgh PittsburghPA United States École Polytechnique Institut Polytechnique de Paris Palaiseau France Department of Physics & Astronomy University of Pittsburgh PittsburghPA United States Department of Chemistry Southern Methodist University DallasTX United States Department of Nuclear Science and Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Department of Physics Massachusetts Institute of Technology CambridgeMA02139 United States Department of Chemistry University of Pittsburgh PittsburghPA United States Department of Mechanical Engineering Massachusetts Institute of Technology BostonMA United States

Diverse organisms exploit the geomagnetic field (GMF) for migration. Migrating birds employ an intrinsically quantum mechanical mechanism for detecting the geomagnetic field: absorption of a blue photon generates a radical pair whose two electrons precess at different rates in the magnetic field, thereby sensitizing cells to the direction of the GMF. In this work, using an in vitro injury model, we discovered a quantum-based mechanism of cellular migration. Specifically, we show that migrating cells detect the GMF via an optically activated, electron spin-based mechanism. Cell injury provokes acute emission of blue photons, and these photons sensitize muscle progenitor cells to the magnetic field. We show that the magnetosensitivity of muscle progenitor cells is (a) activated by blue light, but not by green or red light, and (b) disrupted by the application of an oscillatory field at the frequency corresponding to the energy of the electron-spin/magnetic field interaction. A comprehensive analysis of protein expression reveals that the ability of blue photons to promote cell motility is mediated by activation of calmodulin calcium sensors. Collectively, these data suggest that cells possess a light-dependent magnetic compass driven by electron spin dynamics. © 2025, CC BY.

关键词： Spin dynamics

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Modeling of communications in the safety assessment of nuclear power plants

Modeling of communications in the safety assessment of nucle...

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2008 Winter Meeting and nuclear Technology Expo: nuclear Power-Ready, Steady, Go

作者： Mandelli, D. Kirschenbaum, J. Mangan, L.A. Ekici, E. Aldemir, T. Nuclear Engineering Graduate Program Ohio State University Columbus OH 43210 Department of Computer Science and Engineering Ohio State University Columbus OH 43210 Department of Electrical and Computer Engineering Ohio State University Columbus OH 43210

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Diffusion suppression in gel dosimetry by addition of nanoclay

Diffusion suppression in gel dosimetry by addition of nanocl...

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World Congress on Medical Physics and Biomedical engineering

作者： Maeyama, T. Fukunishi, N. Ishikawa, K.L. Fukasaku, K. Furuta, T. Takagi, S. Noda, S. Himeno, R. RIKEN Nishina Center for Accelerator-Based Science Wako Japan RIKEN Computational Science Research Program Wako Japan University of Tokyo Department of Nuclear Engineering and Management Graduate School of Engineering Tokyo Japan University of Tokyo Photon Science Center Graduate School of Engineering Tokyo Japan Himon'ya Hospital Department of Neurosurgery Tokyo Japan University of Tokyo Department of Mechanical Engineering Graduate School of Engineering Tokyo Japan RIKEN Advanced Center for Computing and Communication Wako Japan

ISBN: (纸本)9783642293047

This paper reports diffusion suppression in gel dosimetery by using nanocomposite gel. A Fricke xylenol gel (FXG) and a dichromate gel (DCG) were selected for adding a small amount of nanoclay (Laponite XLG). The diffusion coefficient and T1 distribution were evaluated by irradiating the gel dosimeter with a heavy ion beam. As a result, these gels showed improvement in the diffusion coefficient. In particular, by addition of the clay, the DCG exhibited diffusion-free characteristics. Moreover, it exhibited high stability after irradiation. © 2013 Springer-Verlag.

关键词： Nanocomposites

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Primary valvular interstitial cell subpopulations isolated based on adhesion strength

Primary valvular interstitial cell subpopulations isolated b...

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Food, Pharmaceutical and Bioengineering Division 2014 - Core programming Area at the 2014 AIChE Annual Meeting

作者： Coombs, Kent E. Rush, Matthew N. Hedberg-Dirk, Elizabeth L. Biomedical Science Graduate Program University of New Mexico AlbuquerqueNM United States Center for Biomedical Engineering University of New Mexico AlbuquerqueNM United States Chemical and Nuclear Engineering University of New Mexico AlbuquerqueNM United States

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Implementation of OpenMP and MPI hybrid parallelization to Monte Carlo dose simulation for particle therapy

Implementation of OpenMP and MPI hybrid parallelization to M...

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World Congress on Medical Physics and Biomedical engineering

作者： Furuta, T. Ishikawa, K.L. Fukunishi, N. Noda, S. Takagi, S. Maeyama, T. Fukasaku, K. Himeno, R. RIKEN Computational Science Research Program Wako Japan University of Tokyo Department of Nuclear Engineering and Management Graduate School of Engineering Tokyo Japan RIKEN Nishina Center for Accelerator-Based Science Wako Japan RIKEN Advanced Center for Computing and Communication Wako Japan University of Tokyo Department of Mechanical Engineering Tokyo Japan Himon'ya Hospital Department of Neurosurgery Tokyo Japan

ISBN: (纸本)9783642293047

We report a successful implementation of the sharedmemory parallelization using OpenMP to the dose calculation by the Monte Carlo particle and heavy-ion transport code PHITS. The OpenMP shared-memory parallelization is better suited than the MPI distributed-memory parallelization which is originally implemented in the PHITS code in the case of human voxel data which requires a large memory space. We have confirmed that the same results can be obtained with and without the shared-memory parallelization by the modified PHITS code. Sufficiently high OpenMP parallelization efficiency (92.4% with 8 parallelized cores within a single node) is achieved even when the special treatment for accessing memory to avoid memory contentions is taken into account. We implement the OpenMP parallelization on top of the MPI parallelization originally included in PHITS so that the modified code works in a hybrid way such that the distributed-memory parallelization for different nodes by MPI and the shared-memory parallelization among the cores in a single node by OpenMP. The performance has been checked on supercomputers: RICC and K computer. © 2013 Springer-Verlag.

关键词： Supercomputers

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Novel photocatalytic coating for corrosion mitigation in 304LSS of dry storage canisters

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Frontiers in Materials 2023年 10卷

作者： Sathasivam, Kamalasekaran Wang, Mei-Ya Anbalagan, Aswin kumar Lee, Chih-Hao Yeh, Tsung-Kuang Nanoscience and Technology Program Taiwan International Graduate Program Academia Sinica Taipei Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu Taiwan Nuclear Science and Technology Development Center National Tsing Hua University Hsinchu Taiwan Institute of Nuclear Engineering and Science National Tsing Hua University Hsinchu Taiwan

Type 304L stainless steel (304LSS) is one of the candidate canister materials for storing radioactive spent fuels, usually near seashore environments along with nuclear power plants. During the prolonged exposure of dry storage canisters to saline environments, they are highly susceptible to chloride induced stress corrosion cracking. Failure of a dry storage canister not only would release radioactive isotopes into the environment, but would also lead to a costly replacement of the cracked canister. The objective of this study is to develop a multilayered titanium dioxide (TiO2) composite coating on a 304LSS substrate. With ultraviolet (UV) illumination, this coating would act as a barrier and simultaneously offer cathodic protection against corrosion in the substrate alloy. The composite coating consists of a plain amorphous TiO2 coating over another cerium-doped (Ce-doped) TiO2 coating. Electronic currents generated by photo-catalytic reaction of the amorphous TiO2 coating under UV illumination were measured. Photo-electrochemical analyses and surface morphology observations were conducted to evaluate the performance of the Ce-doped coatings on corrosion mitigation. Optimal amounts of cerium doping that offered better photo-cathodic protection were also explored. Results indicated that the Ce-doped TiO2 coating exhibited a better performance on photo-cathodic protection for 304L stainless steel in aerated 3.5% NaCl solutions than the one without cerium doping. The underlying Ce-doped TiO2 coating was effectively charged during UV illumination, and it was able to continuously release electrons even after the UV was switched off, thus providing uninterrupted photo-cathodic protection for the coated 304L stainless steel substrate. Copyright © 2023 Sathasivam, Wang, Anbalagan, Lee and Yeh.

关键词： Titanium dioxide

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Development of robotic multisensor inspection system for used nuclear fuel canisters

Development of robotic multisensor inspection system for use...

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2016 Transactions of the American nuclear Society, ANS 2016

作者： Lissenden, C.J. Motta, A.T. Brennan, Sean Reichard, Karl Jovanovic, I. Knight, T. Popovics, J. Department of Engineering Science and Mechanics Pennsylvania State University PA16802 United States Department of Mechanical and Nuclear Engineering Pennsylvania State University PA16802 United States Applied Research Laboratory Pennsylvania State University PA16802 United States Department of Nuclear Engineering and Radiological Sciences University of Michigan Ann ArborMI48109 United States Nuclear Engineering Graduate Program University of South Carolina ColumbiaSC29208 United States Department of Civil and Environmental Engineering University of Illinois Urbana-ChampaignIL61801 United States

Dry storage of used nuclear fuel is an integral part of the fuel cycle and methods to inspect the canisters that confine the used fuel rods are being established. The challenges for inspection systems include geometric constraints, elevated temperature, and radiation. A novel robotic inspection system focusing on stress corrosion cracking capable of in-situ surface composition characterization and crack detection is under development. The delivery system, laser induced breakdown spectroscopy for surface composition, and ultrasonic guided waves for crack detection are summarized herein.

关键词： Crack detection

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