Showing papers in "Nuclear Science and Engineering in 1971"
TL;DR: In this paper, the ray effect, a flux distortion producing defect of the discrete ordinates approximation to the transport equation, is considered and partially effective remedies of increasing the number of rays are proposed.
Abstract: Remedies are considered for the ray effect, a flux distortion producing defect of the discrete ordinates approximation to the transport equation. The partially effective remedies of increasing the ...
139 citations
TL;DR: In this paper, Monte Carlo principles and Neutron Transport Problems are used to solve transport problems in nuclear power plants, and the Monte Carlo principle is applied to the transport of neutrons.
Abstract: (1971). Monte Carlo Principles and Neutron Transport Problems. Nuclear Science and Engineering: Vol. 46, No. 3, pp. 439-440.
113 citations
TL;DR: The effectiveness of the acceleration techniques known as coarse mesh re-balance and the synthetic method is examined for the iterative processes of transport codes and these two methods are shown to be equivalent in a certain sense.
Abstract: The effectiveness of the acceleration techniques known as coarse mesh re-balance and the synthetic method is examined for the iterative processes of transport codes. These two methods are shown to be equivalent in a certain sense. Analysis is presented in homogeneous slab geometry which gives a necessary condition for the convergence of the synthetic method. Stable versions of these methods are developed, and numerical results comparing their effectiveness with that of Chebychev acceleration are presented.
95 citations
TL;DR: In this article, three new difference schemes for solving the neutron transport equation were presented, which give smoother results than the diamond difference scheme, without sacrificing sacrifi ciency, in some situations.
Abstract: Three new difference schemes for solving the neutron transport equation are presented. In some situations these new methods give smoother results than the diamond difference scheme, without sacrifi...
94 citations
83 citations
TL;DR: In this paper, a technique based on the Pade approximations is applied to the solution of the point kinetics equations, which consists of treating explicitly the roots of the inhour formula which would make...
Abstract: A technique based on the Pade approximations is applied to the solution of the point kinetics equations. The method consists of treating explicitly the roots of the inhour formula which would make ...
50 citations
TL;DR: In this article, the rate of energy loss in matter suffered by a heavy charged particle from nuclear forces elastic scattering plus nuclear Coulomb interference was derived, and the results for charge one and two were obtained.
Abstract: The rate of energy loss in matter suffered by a heavy charged particle from nuclear forces elastic scattering plus nuclear Coulomb interference is derived, and the results for charge one and two nu
45 citations
TL;DR: It is generally agreed that lateral vibration of nuclear fuel elements is random in nature and is caused by random pressure fluctuations acting on the element surface as discussed by the authors, and a series of tests have been con...
Abstract: It is generally agreed that lateral vibration of reactor fuel elements is random in nature and is caused by random pressure fluctuations acting on the element surface.A series of tests has been con...
42 citations
TL;DR: In this paper, a simplified, finite-difference diffusion scheme for a three-dimensional calculation of the gross power distribution in the core of a boiling water reactor (BWR) is presented.
Abstract: A simplified, finite-difference diffusion scheme for a three-dimensional calculation of the gross power distribution in the core of a boiling water reactor (BWR) is presented. Results obtained in a...
35 citations
TL;DR: In this paper, the evolution of a systematic procedure for fuel cycle optimization and a new approach using a linear program for optimal fuel allocation is presented, and the process of loading, operating, and refueling is described.
Abstract: The evolution of a systematic procedure for fuel cycle optimization and a new approach using a linear program for optimal fuel allocation is presented.The process of loading, operating, and refueli...
32 citations
TL;DR: The factors contributing to the bias introduced in the experimental determination of void fractions in liquid flow systems by methods of radiation diagnosis are examined in this paper, where it is shown that err...
Abstract: The factors contributing to the bias introduced in the experimental determination of void fractions in liquid flow systems by methods of radiation diagnosis are being examined. It is shown that err...
TL;DR: In this article, a semi-analytical technique for the solution of neutron and gamma-ray transport in one-dimensional finite systems is developed, which is applicable to multivelocity, multiregion systems with a...
Abstract: A semi-analytical technique for the solution of neutron and gamma-ray transport in one-dimensional finite systems is developed. The method is applicable to multivelocity, multiregion systems with a...
TL;DR: In this paper, hydraulic-network models have been used to study transient flow phenomena in pressurized water reactor plants, but the nature of the differential equations associated with these networks imposes severe...
Abstract: Hydraulic-network models have been used to study transient flow phenomena in pressurized water reactor plants. The nature of the differential equations associated with these networks imposes severe...
TL;DR: In this article, the fuel management optimization problem within a light water moderated nuclear reactor is formulated as a multistage decision process, and the amount of fresh fuel in each zone and the shuffling s...
Abstract: The fuel management optimization problem within a light water moderated nuclear reactor is formulated as a multistage decision process, and the amount of fresh fuel in each zone and the shuffling s...
TL;DR: The neutron absorption and fission cross sections for 239Pu have been measured simultaneously over the neutron energy range from 002 eV to 30 keV using an ioniz ionizer as discussed by the authors.
Abstract: The neutron absorption and fission cross sections for 239Pu have been measured simultaneously over the neutron energy range from 002 eV to 30 keV These cross sections were measured using an ioniz
TL;DR: In this article, the problem of optimal control rod withdrawal sequence for a multizone core model of a nuclear reactor is formulated for a light-water nuclear power plant and the maximum average burnup problem is solved.
Abstract: The problem of optimal control rod withdrawal sequence is formulated for a multizone core model of a nuclear reactor. In particular, the maximum average burnup problem for light-water reactors is i...
TL;DR: In this paper, a method for obtaining bounded estimators for radiation flux at a point detector in a Monte Carlo calculation is presented, in which the collision density in the neighbor area is biased by bias bias bias.
Abstract: Methods are given for obtaining bounded estimators for radiation flux at a point detector in a Monte Carlo calculation. In essence, the procedure is to so bias the collision density in the neighbor...
TL;DR: In this paper, the derivation of discrete ordinates and discrete ordinate-like approximations from variational principles for the one-speed transport equation is explored, based on a variational approach.
Abstract: The derivation of discrete ordinate and discrete ordinate-like approximations from variational principles for the one-speed transport equation is explored here. Standard discrete ordinate approxima...
TL;DR: In this paper, the applications of the perturbation theory for ratios of functionals and its relation with the conventional perturbations theory are discussed, and some relevant improvements are derived in connection with these applications.
Abstract: The applications of the perturbation theory for ratios of functionals and its relation with the conventional perturbation theory are discussed. Some relevant improvements are derived in connection ...
TL;DR: In this paper, a Ge(Li) detector-multichannel analyzer was used to count the gamma-ray counts of the radioactive daughters of the radionuclidean isotope 94Zr and 96Zr.
Abstract: Neutron absorption cross sections for 94Zr and 96Zr were measured by an activation technique. Absolute gamma-ray counting of the radioactive daughters, with a Ge(Li) detector-multichannel analyzer ...
TL;DR: In this paper, four different epicadmium neutron flux spectra were produced by boron filter insertion in a beam port of the Cornell University 100-kW TRIGA reactor.
Abstract: Four different epicadmium neutron flux spectra were produced by boron filter insertion in a beam port of the Cornell University 100-kW TRIGA reactor. The first spectrum was the unaltered (except fo...
TL;DR: In this paper, a series of space-time reactor kinetics experiments has been performed in the Solid Homogeneous Assembly (SHA) and the ground rules were the following: the cores were to be easy to model statically using fe...
Abstract: A series of space-time reactor kinetics experiments has been performed in the Solid Homogeneous Assembly. The ground rules were the following: The cores were to be easy to model statically using fe...
TL;DR: In this article, a synthesis and generalization of several recently developed methods for the numerical solution of the neutron transport equation in a homogeneous slab, assuming anisotropic scattering and energy dilation, is presented.
Abstract: A synthesis and generalization of several recently developed methods for the numerical solution of the neutron transport equation in a homogeneous slab, assuming anisotropic scattering and energy d...
TL;DR: In this paper, critical heat flux and pressure drop tests were run with vertical upflow of water parallel to 20-rod bundles of rods at 1200 to 2000 psia and mass velocities from 0.15 × 106 to 3.0 × 106 lb/(h ft2).
Abstract: Critical heat flux and pressure drop tests were run with vertical upflow of water parallel to 20-rod bundles of rods at 1200 to 2000 psia and mass velocities from 0.15 × 106 to 3.0 × 106 lb/(h ft2)...
TL;DR: A computer-based method for treating the motion of charged and neutral particles called the phase space time evolution (PSTE) method has been developed as discussed by the authors, instead of utilizing the int...
Abstract: A computer-based method for treating the motion of charged and neutral particles called the phase space time evolution (PSTE) method has been developed. This technique, instead of utilizing the int...