Synthesis of a three-dimensional neutron field in calculations of heterogeneous reactors

1974 ◽  
Vol 37 (3) ◽  
pp. 970-972
Author(s):  
I. S. Slesarev ◽  
A. M. Sirotkin ◽  
V. V. Khromov
Keyword(s):  
Three Dimensional ◽  
Neutron Field

Study of the three-dimensional neutron field in the core of the IGR (pulsed graphite reactor)

Atomic Energy ◽  
1997 ◽  
Vol 82 (6) ◽  
pp. 403-408 ◽  
Author(s):  
A. P. Vasil'ev ◽  
N. V. Gorin ◽  
Ya. Z. Kandiev ◽  
S. I. Samarin ◽  
V. A. Gaidaichuk ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Neutron Field ◽  
The Core ◽  
Graphite Reactor

scholarly journals Thermal neutron flux distribution in ET-RR-2 reactor thermal column

2002 ◽  
Vol 17 (1-2) ◽  
pp. 64-67
Author(s):  
Mahmoud Imam ◽  
Hassan Roushdy
Keyword(s):  
Neutron Flux ◽  
Thermal Neutron ◽  
High Intensity ◽  
Thermal Neutron Flux ◽  
Thermal Flux ◽  
Three Dimensional ◽  
Neutron Field ◽  
Reactor System ◽  
External Irradiation ◽  
Thermal Column

The thermal column in the ET-RR-2 reactor is intended to promote a thermal neutron field of high intensity and purity to be used for following tasks: (a) to provide a thermal neutron flux in the neutron transmutation silicon doping, (b) to provide a thermal flux in the neutron activation analysis position, and (c) to provide a thermal neutron flux of high intensity to the head of one of the beam tubes leading to the room specified for boron thermal neutron capture therapy. It was, therefore, necessary to determine the thermal neutron flux at above mentioned positions. In the present work, the neutron flux in the ET-RR-2 reactor system was calculated by applying the three dimensional diffusion depletion code TRITON. According to these calculations, the reactor system is composed of the core, surrounding external irradiation grid, beryllium block, thermal column and the water reflector in the reactor tank next to the tank wall. As a result of these calculations, the thermal neutron fluxes within the thermal column and at irradiation positions within the thermal column were obtained. Apart from this, the burn up results for the start up core calculated according to the TRITION code were compared with those given by the reactor designer.

scholarly journals Visualization of the Neutron Fields Behavior According to the Operational Archives of the Nuclear Reactor RBMK

2021 ◽  
Author(s):  
Alexey Bukalin ◽  
Andrey Zagrebayev ◽  
Viktor Pilyugin
Keyword(s):  
Harmonic Functions ◽  
Nuclear Reactor ◽  
Three Dimensional ◽  
Neutron Field ◽  
Operational Parameters ◽  
Calculation Algorithm ◽  
Reactor Control ◽  
Spatial Deformation ◽  
Tube Reactor

This paper describes the calculation algorithm, software package and visualization of the three- dimensional neutron field deformation according to the archive of the RBMK (high-power pressure-tube reactor) reactor operational parameters. The determination of the field deformation is based on finding "natural" functions for approximating the readings of in- reactor control discretely located sensors. This paper considers the use of generally accepted harmonic functions and "natural" functions for describing the spatial deformation of the neutron field. It is shown that to describe the deformation of the neutron field, it is sufficient to use only a few "natural" functions, in contrast to the use of all harmonic functions from a given set. This, in turn, opens up new possibilities, in particular, for solving the problems of predictive diagnostics of in-reactor control sensors.

The orbit of Pluto over a long interval of time

1966 ◽  
Vol 25 ◽  
pp. 227-229 ◽  
Author(s):  
D. Brouwer
Keyword(s):  
Periodic Orbit ◽  
Numerical Integration ◽  
Restricted Problem ◽  
Three Dimensional ◽  
The Third ◽  
Circular Restricted Problem ◽  
Resonance Relation

The paper presents a summary of the results obtained by C. J. Cohen and E. C. Hubbard, who established by numerical integration that a resonance relation exists between the orbits of Neptune and Pluto. The problem may be explored further by approximating the motion of Pluto by that of a particle with negligible mass in the three-dimensional (circular) restricted problem. The mass of Pluto and the eccentricity of Neptune's orbit are ignored in this approximation. Significant features of the problem appear to be the presence of two critical arguments and the possibility that the orbit may be related to a periodic orbit of the third kind.

Conformation of Ribosomes from Escherichia Coli

1974 ◽  
Vol 32 ◽  
pp. 210-211
Author(s):  
M. Boublik ◽  
W. Hellmann ◽  
F. Jenkins
Keyword(s):  
Binding Sites ◽  
Ribosomal Proteins ◽  
Fluorescent Dyes ◽  
Protein Biosynthesis ◽  
Three Dimensional ◽  
Spatial Arrangement ◽  
Dimensional Structure ◽  
Complete Understanding ◽  
And Function

The present knowledge of the three-dimensional structure of ribosomes is far too limited to enable a complete understanding of the various roles which ribosomes play in protein biosynthesis. The spatial arrangement of proteins and ribonuclec acids in ribosomes can be analysed in many ways. Determination of binding sites for individual proteins on ribonuclec acid and locations of the mutual positions of proteins on the ribosome using labeling with fluorescent dyes, cross-linking reagents, neutron-diffraction or antibodies against ribosomal proteins seem to be most successful approaches. Structure and function of ribosomes can be correlated be depleting the complete ribosomes of some proteins to the functionally inactive core and by subsequent partial reconstitution in order to regain active ribosomal particles.

Sign in / Sign up

Export Citation Format

Share Document