[EN] To study the behaviour of nuclear power reactors it is necessary to solve the time dependent neutron
diffusion equation using either a rectangular mesh for PWR and BWR reactors or a hexagonal mesh for
VVER reactors. ...
To simulate the behaviour of a nuclear power reactor it is necessary to be able to integrate the time-dependent neutron diffusion equation inside the reactor core. Here the spatial discretization of this equation is done ...
[EN] The evolution of the neutronic power inside of a nuclear reactor core can be approximated by means of the diffusive time-dependent simplified spherical harmonics equations
(SPN). For the spatial discretization of ...
Carreño, A.; Vidal-Ferràndiz, Antoni; Ginestar Peiro, Damián; Verdú Martín, Gumersindo Jesús(UP4 Institute of Sciences, S.L., 2017)
[EN] Determination of the reactor kinetic characteristics is very important for the design and development of a new reactor system.
In this sense, the computation of lambda modes associated to a nuclear power reactor has ...
[EN] The mechanical vibrations of core internals such as fuel assemblies (FAs) cause oscillations in the neutron flux that require in some circumstances nuclear power plants to operate at a reduced power level. This work ...
A PL spherical harmonics-nodal collocation method is applied to
the solution of the multidimensional neutron source transport equation.
Vacuum boundary conditions are approximated by setting Marshak's
...
[EN] A classical discretization for the angular dependence of the neutron transport equation is based on a truncated spherical harmonics expansion. The resulting system of equations are the PL equations. We review the ...
Sánchez Juan, Elena; Coll Aliaga, Peregrina del Carmen; Ginestar Peiro, Damián; Sanabria Codesal, Esther(Universitat Politècnica de València, 2017-05-12)
Obtención de los mínimos (de forma similar, los máximos) de una función de una y de dos variables usando dos procedimientos: directamente usando el comando FindMinimum[] y aplicando un algoritmo para obtener una aproximación ...
In this work, BWR stability analysis has been performed on an operating point (PT_UPV) of Peach Bottom NPP which is inside the exclusion region in the operating power-flow map. The simulation has been made with the coupled ...
[EN] The neutron transport equation describes the distribution of neutrons inside a nuclear reactor core. Homogenization strategies have been used for decades to reduce the spatial and angular domain complexity of a nuclear ...
[EN] Spectral preconditioners are based on the fact that the convergence rate of Krylov subspace
methods is improved if the eigenvalues of smallest magnitude of the system matrix are
`removed'. In this paper, two ...
Bautista Carrascosa, María Inmaculada; Ginestar Peiro, Damián(Universitat Politècnica de València, 2016-07-12)
Aunque los climas terrestres están determinados fundamentalmente por la latitud, a escala local y regional se pueden producir diferencias climáticas importantes. Las variaciones topográficas pueden producir diferencias ...
Bautista Carrascosa, María Inmaculada; Ginestar Peiro, Damián(Universitat Politècnica de València, 2016-06-27)
En esta objeto se analiza el efecto de la hora del día, para los distintos días del año y las distintas latitudes del planeta sobre la densidad de flujo de energía procedente del sol que se recibe en ese punto. Hay puntos ...
Bautista Carrascosa, María Inmaculada; Ginestar Peiro, Damián(Universitat Politècnica de València, 2016-07-12)
A escala local y regional se pueden producir diferencias climáticas importantes. Las variaciones topográficas en la pendiente del terreno producen diferencias en radiación solar equivalentes a decenas de grados de latitud.
La ...
Se requieren métodos numéricos para resolver la Ecuación de la Difusión
Neutrónica (EDN) aplicada a reactores nucleares debido a su naturaleza heterogénea.
Los métodos numéricos más utilizados son el Método de Diferencias ...
Numerical methods are usually required to solve the neutron diffusion equation applied to nuclear reactors due to its heterogeneous nature. The most popular numerical techniques are the Finite Difference Method (FDM), the ...
[EN] Domain decomposition is a mature methodology that has been used to accelerate the convergence of partial differential equations. Even if it was devised as a solver by itself, it is usually employed together with Krylov ...
Lidón, Antonio; Ginestar Peiro, Damián; Carlos Alberola, Sofía; Sanchez de Oleo, Carlos; Jaramillo, Claudia; Ramos, Carlos(Instituto Nacional de Investigacion y Tecnologia Agraria y Alimentaria, 2019)
[EN] Aim of study: The development of a procedure to calibrate the LEACHM and EU-Rotate N models for simulating water and nitrogen dynamics in cauliflower crops.
Area of study: Calibration was performed using experimental ...
[EN] The electron amplification and transport within a photomultiplier tube (PMT) has been investigated by
developing an in-house Monte Carlo simulation code. The secondary electron emission in the dynodes is
implemented ...