scholarly journals Flux extrapolation models used in the DOT IV discrete ordinates neutron transport code

1980 ◽  
Author(s):  
E. T. Tomlinson ◽  
W. A. Rhoades ◽  
W. W. Engle, Jr.
Keyword(s):  
Neutron Transport ◽  
Discrete Ordinates ◽  
Transport Code

scholarly journals Evaluation of PWR pressure vessel fast neutron fluence benchmarks from NUREG/CR-6115 with ares transport code

2017 ◽  
Vol 32 (3) ◽  
pp. 204-210 ◽  
Author(s):  
Liang Zhang ◽  
Bin Zhang ◽  
Cong Liu ◽  
Yixue Chen
Keyword(s):  
Fast Neutron ◽  
Pressure Vessel ◽  
Neutron Fluence ◽  
Neutron Transport ◽  
Source Distribution ◽  
Discrete Ordinates ◽  
Source Modeling ◽  
Transport Code ◽  
Vessel Integrity ◽  
Angular Discretization

An accurate evaluation of PWR pressure vessel fast neutron fluence is essential to ensure pressure vessel integrity over the design lifetime. The discrete ordinates method is one of the main methods to treat such problems. In this paper, evaluations have been performed for three PWR benchmarks described in NUREG/CR-6115 using ARES transport code. The calculated results were compared to the reference values and a satisfactory agreement was obtained. In addition, the effects of SN numeric and source distribution modeling for pressure vessel fast neutron fluence calculation are investigated. Based on the fine enough grids adopted, the different spatial and angular discretization introduces derivations less than 3 %, and fix-up for negative scattering source causes no noticeable effects when calculating pressure vessel fast neutron fluence. However, the discrepancy of assembly-wise and pin-wise source modeling for peripheral assemblies reaches ~20 %, which indicates that pin-wise modeling for peripheral assemblies is essential. These results provide guidelines for pressure vessel fast neutron fluence calculation and demonstrate that the ARES transport code is capable of performing neutron transport calculations for evaluating PWR pressure vessel fast neutron fluence.

Development of high-fidelity neutron transport code STREAM

2021 ◽  
pp. 107915
Author(s):  
Sooyoung Choi ◽  
Wonkyeong Kim ◽  
Jiwon Choe ◽  
Woonghee Lee ◽  
Hanjoo Kim ◽  
...  
Keyword(s):  
Neutron Transport ◽  
High Fidelity ◽  
Transport Code

scholarly journals Assessment of the Lagrange Discrete Ordinates Equations for Three-Dimensional Neutron Transport

2018 ◽  
Vol 193 (3) ◽  
pp. 233-252 ◽  
Author(s):  
Kelly L. Rowland ◽  
Cory D. Ahrens ◽  
Steven Hamilton ◽  
R. N. Slaybaugh
Keyword(s):  
Neutron Transport ◽  
Three Dimensional ◽  
Discrete Ordinates

Variational Approach in Transport Theory

2004 ◽  
Author(s):  
Rube´n Panta Pazos ◽  
Marco Tu´llio de Vilhena
Keyword(s):  
Variational Approach ◽  
Transport Theory ◽  
Neutron Transport ◽  
Specular Reflection ◽  
Adjoint Equations ◽  
Discrete Ordinates ◽  
Neutron Transport Equation ◽  
Bounded Set ◽  
Transport Problems ◽  
Complementary Subset

In this work we present a variational approach to some methods to solve transport problems of neutral particles. We consider a convex domain X (for example the geometry of slab, or a convex set in the plane, or a convex bounded set in the space) and we use discrete ordinates quadrature to get a system of differential equations derived from the neutron transport equation. The boundary conditions are vacuum for a subset of the boundary, and of specular reflection for the complementary subset of the boundary. Recently some different approximation methods have been presented to solve these transport problems. We introduce in this work the adjoint equations and the conjugate functions obtained by means of the variational approach. First we consider the general formulation, and then some numerical methods such as spherical harmonics and spectral collocation method.

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