Determination of equivalent dimensions of equally effective ?black-body? absorbers in a nonmultiplicative medium by a pulsed neutron source method

1971 ◽  
Vol 31 (1) ◽  
pp. 764-766
Author(s):  
L. N. Yurova ◽  
V. L. Romodanov ◽  
V. A. Fedorovich
Keyword(s):  
Neutron Source ◽  
Black Body ◽  
Source Method ◽  
Pulsed Neutron ◽  
Equivalent Dimensions ◽  
Pulsed Neutron Source

Research on the Measurement of Deep Subcriticality Based on Pulsed Neutron Source Method

2013 ◽  
Author(s):  
Shibiao Pan
Keyword(s):  
Neutron Source ◽  
Distortion Correction ◽  
Prompt Neutron ◽  
Reactor Neutron ◽  
Ratio Method ◽  
Neutron Kinetics ◽  
Source Method ◽  
Control Rods ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

During the operating of nuclear reactor, the applicable condition of point reactor neutron kinetics is changed by control rods bulk insertion and reactor lattice deviating from the critical state, The measurement of reactivity, with the increase of subcriticality, shows that the results impact on the kinetic distortion effect, along with prompt neutron flux strongly deteriorated. According to the diffusion theory about prompt neutron and delayed neutron, the theoretical analysis and application of point reactor neutron kinetics have been carried out to quantify the kinetic distortion correction factors in subcritical systems, and these indicate that prompt neutron distributions are strongly affected by kinetic distortion. With the self-developed Pulsed Neutron Source measurement system, subcriticality measurement in different configuration of control rods in the zero power reactor of Nuclear Power Institute of China was carried out. In this paper the reactivity of the deep subcritical system are obtained by experiment of Pulsed Neutron Source method, meanwhile, the bias between experiment results of the areas-ratio method and the characteristic decay constant method are analyzed by comparing the condition of the experiment and the theory model, the main factors inducing the bias are found, which supplies helpful reference for other similar design and experiment.

Study of highly-enriched uranium-water systems in deep subcriticality by a pulsed neutron source method

1968 ◽  
Vol 25 (1) ◽  
pp. 746-748
Author(s):  
�. A. Stumbur ◽  
I. P. Matveenko ◽  
G. A. Karchava ◽  
V. I. Matveenko ◽  
A. G. Shokod'ko
Keyword(s):  
Neutron Source ◽  
Water Systems ◽  
Source Method ◽  
Enriched Uranium ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

Determination of the stress orientation distribution function using pulsed neutron sources

2003 ◽  
Vol 36 (1) ◽  
pp. 14-22 ◽  
Author(s):  
Y. D. Wang ◽  
X.-L. Wang ◽  
A. D. Stoica ◽  
J. W. Richardson ◽  
R. Lin Peng
Keyword(s):  
Distribution Function ◽  
Neutron Source ◽  
Orientation Distribution Function ◽  
Orientation Distribution ◽  
Interstitial Free ◽  
Neutron Sources ◽  
Stress Orientation ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

The stress orientation distribution function (SODF) was recently introduced as a mean-field representation to describe the grain-orientation dependence of intergranular stress. Pulsed neutron sources are ideally suited for the determination of the SODF since multiple reflections can be measured simultaneously with comparable precision. A method is developed for constructing the SODF from strain pole figures measured with a pulsed neutron source and demonstrated with cold-rolled interstitial-free steel. The experimental results are compared with those measured with a reactor-based constant-wavelength diffractometer. It is shown that access to a large number of reflections on a pulsed neutron source improves the precision of the experimental SODF and facilitatesin situstudies of the evolution of the intergranular stress during deformation and annealing.

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