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Showing 1 to 17 of 17 for “"Self-shielding"”.
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Neutron Absorption Self-Shielding Factors in Activation Analysis
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Novel Resonance Self-Shielding Methods for Nuclear Reactor Analysis
… cross section generation and resonance self-shielding. This work has two primary objectives: to quantitatively assess the efficacy of current self-shielding approximations and to propose new self-shielding methods. These objectives are cast primarily in the context of mutual …
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Assessment of Dancoff adjusted Wigner-Seitz cells for self-shielding LWR lattices
… thickness to produce more accurate resonance self-shielded cross sections for light water reactor (LWR) lattices. The WS approximation has been commonly used in lattice physics calculations for many decades regardless that it has been shown to underestimate k-eff for an infinite LWR lattice by …
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Reactor agnostic multi-group cross section generation for fine-mesh deterministic neutron transport simulations
… the clustering of pin-wise MGXS due to spatial self-shielding spectral effects. The Local Neighbor Symmetry (LNS) scheme uses a nearest neighbor-like analysis of a reactor geometry to determine which fuel pins should be assigned the same MGXS. The inferential MGXS (iMGXS) scheme applies …
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Reactivity-equivalent physical transformation model for pin cell arrays
… as it does not properly account for the self shielding of the TRISO particles. The Reactivity-equivalent transformation (RPT) model, which condenses the TRISO fuel into a smaller fuel zone radius before homogenization, has been proposed as a possible solution to the problem of …
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A novel equivalence method for high fidelity hybrid stochastic-deterministic neutron transport simulations
… of the neutron currents as well as removing the self-shielding error. This new method is systematically benchmarked against the state-of-the-art method, SuPerHomogenization in three different approaches to obtaining equivalence factors: a same-scale iterative approach, a multiscale approach, and …
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Development of a radiation computation dose model for use in ultraviolet phototherapy
… placement of the reflectors and the position and self-shielding from the patient as well as cabin geometry. Lamp failure can also occur, complicating matters. A dose model that estimates all these factors and quantifies them could be of use in a variety of clinical applications. This research …
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High-Performance High-Power Inductor Design for High-Frequency Applications
… and quasi-distributed gaps to achieve a self-shielded inductor that emits less flux outside its physical volume and can be placed close to other circuit components without inducing EMI or eddy current loss. The performance and self-shielding characteristics of the proposed design …
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Micro-heterogeneous thorium based fuel concepts for pressurized water reactions
… that they are due to a combination of changes in self-shielding, local fissile worth, and conversion ratio.
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Performance analysis of functional expansion tallies on 2D PWR pin cell
… set is then proposed and tested. To capture the self-shielding effect of the U-238 absorption rate, an exponential basis set is chosen. The results show that the exponential basis set can reduce the optimum order of expansion by half comparing with orthogonal Zernike polynomials while achieving …
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FASPEC, a program to determine group constants for up to 47 groups in a fast neutron spectrum
… for a mid-range Infinite hexagonal lattice. Self-shielding effects are included indirectly. A brief user's guide is provided. Group constants calculated and stored for either terminal display or printed output are group number, lowest energy of the group, macroscopic removal cross section, …
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Design, implementation, and evaluation of high-efficiency high-power radio-frequency inductors
… extended to an inductor design which achieves "self-shielding" in which the magnetic field generated by the element is wholly contained within the physical volume of the structure rather than extending into space as a conventional air-core inductor would. This development enables significant …
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Development of MURR flux trap model for simulation and prediction of sample loading reactivity worth and isotope production
… has been refined with the consideration of the self-shielding effect and burnup effect. The modified model has yielded better predictions approaching the experimental values. The MCNP and MonteBurns models were integrated into an automatic analytic tool with Visual Basic language for efficient …
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Resonance treatment using the Discrete Generalized Multigroup method
… on approximate models to account for resonance self-shielding effects. A multi-level approach, which includes several levels of calculations where complexity in energy is decreased as spatial complexity is increased, is employed to model nuclear reactors. However, this approach breaks down when …
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Dwarf Galaxies in a Cosmological Context: A Testbench for Galaxy Modeling
… not local) background, a simple prescription for self-shielding, star formation and two different models for supernova-driven energetic feedback. To better understand the impact of each physical effect, we carry out simulations excluding each major effect in turn. We find that reionization is …
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Analysis of surrogate post-detonation urban debris (SPUD) gamma rays and self-attenuation
… Upon completion of gamma-ray analysis, a self-attenuation analysis used to model the efficiency of a High-Purity Germanium detector (HPGe) as a function of source density and volume was conducted using MCNP.
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Variable Fidelity Monte Carlo Neutron Transport: On Combining Multi-Group and Continuous Energy Representation in Monte Carlo Calculations
… was accomplished using methods derived from self-shielding calculations applied to a simplified pin cell model of a neighbourhood of the interface. This approach was successful at reducing a relatively large (4-7%) error in resonance capture rate in the CE region for simple problems, but the …