U-235 Prompt Neutron Fission Spectrum Data Sensitivity/Uncertainty Effects in Fuel Cycle Performance Parameters

2012 ◽  
Author(s):  
Marie Cuvelier ◽  
Pavel Tsvetkov
Keyword(s):  
Fuel Cycle ◽  
Cycle Performance ◽  
Prompt Neutron ◽  
Performance Parameters ◽  
Neutron Fission ◽  
Fission Spectrum ◽  
Data Sensitivity ◽  
Spectrum Data ◽  
Neutron Fission Spectrum

scholarly journals Transuranics Transmutation Using Neutrons Spectrum from Spallation Reactions

2015 ◽  
Vol 2015 ◽  
pp. 1-23 ◽  
Author(s):  
Maurício Gilberti ◽  
Claubia Pereira ◽  
Maria Auxiliadora F. Veloso ◽  
Antonella Lombardi Costa
Keyword(s):  
Simple Model ◽  
Neutron Spectrum ◽  
Hybrid System ◽  
Target Material ◽  
Neutron Fission ◽  
Spallation Target ◽  
Transport Code ◽  
Spallation Reactions ◽  
Fission Spectrum ◽  
Neutron Fission Spectrum

The aim is to analyse the neutron spectrum influence in a hybrid system ADS-fission inducing transuranics (TRUs) transmutation. A simple model consisting of an Accelerator-Driven Subcritical (ADS) system containing spallation target, moderator or coolant, and spheres of actinides, “fuel,” at different locations in the system was modelled. The simulation was performed using the MCNPX 2.6.0 particles transport code evaluating capture(n,γ)and fission(n,f)reactions, as well as the burnup of actinides. The goal is to examine the behaviour and influences of the hard neutron spectrum from spallation reactions in the transmutation, without the contribution or interference of multiplier subcritical medium, and compare the results with those obtained from the neutron fission spectrum. The results show that the transmutation efficiency is independent of the spallation target material used, and the neutrons spectrum from spallation does not contribute to increased rates of actinides transmutation even in the vicinity of the target.

Simulating the neutron-fission spectrum with a Po-Be source

1969 ◽  
Vol 27 (2) ◽  
pp. 876-877
Author(s):  
V. A. Kryzhanovskii ◽  
V. V. Terekhin
Keyword(s):  
Neutron Fission ◽  
Fission Spectrum ◽  
Neutron Fission Spectrum

scholarly journals Doses of caffeine on the development and performance of pepper crops under greenhouse

2014 ◽  
Vol 32 (4) ◽  
pp. 398-403 ◽  
Author(s):  
Óscar Montes ◽  
Fernando Diánez ◽  
Francisco Camacho
Keyword(s):  
Fruit Quality ◽  
Cycle Performance ◽  
Morphological Development ◽  
Performance Parameters ◽  
Stimulant Effect ◽  
Plant Organs ◽  
Vegetative Plant ◽  
Production Parameters ◽  
Growth Stimulator ◽  
And Performance

A number of experiments on plant organs demonstrated that caffeine acts as a growth stimulator. In this study we aimed to determine the influence of caffeine on development of pepper crops under stress in the autumn-winter cycle, as peppers stop growing and developing in November and January. The experiments were conducted to determine how caffeine applied to the soil by fertigation, with doses of 2.25 µM and 9.00 µM for T1 and T2, respectively, compared to the control crop, affect the morphological development and performance of the pepper crops during two crop cycles (2008-2009 and 2009-2010 in autumn-winter). Throughout the whole vegetative plant cycle, performance parameters of fruit quality and the influence on the morphological development were obtained on different dates. With respect to the remainder of the morphological and production parameters, no significant differences were discovered in either of the evaluated cycles, thus leading to the conclusion that the two doses of caffeine, 2.25 µM and 9.00 µM, did not have any stimulant effect on the development and performance of the pepper crop during both cycles. Total yields were unaffected by either treatment, 4.89, 4.90 and 4.88 kg/m2 for the first assay and 5.28, 5.23 and 5.28 for the second, for treatments control and caffeine dosses 2.25 µM y 9.00 µM respectively.

EPR™: A Reactor to Support Economical Fuel Cycles

2010 ◽  
Author(s):  
S. Zheng ◽  
R. Meinl ◽  
J. Stephens
Keyword(s):  
High Performance ◽  
Fuel Cycle ◽  
Large Range ◽  
Management Strategies ◽  
Systems Design ◽  
Cycle Performance ◽  
Reactor Safety ◽  
Fuel Management ◽  
Fuel Cycles ◽  
Economic Analyses

The EPR™ reactor has been designed by AREVA to support economical fuel cycles. The progress in the reactor and systems design improves the reactor safety, and allows the EPRTM reactor to support the large range of high performance fuel management strategies covering cycle length from 12 to 24 months. Different fuel management strategies with 12, 18 and 24 month cycles are described. Economic analyses are performed to illustrate the low uranium consumption and the high fuel cycle performance compared with the fuel managements implemented in most current traditional PWR reactors.

Measurements of Fast Neutron-induced Prompt Neutron Fission Spectra of233U,238U and232Th

2002 ◽  
Vol 39 (sup2) ◽  
pp. 409-412 ◽  
Author(s):  
Takako Miura ◽  
Mamoru Baba ◽  
Than Win ◽  
Masanobu Ibaraki ◽  
Yoshitaka Hirasawa ◽  
...  
Keyword(s):  
Fast Neutron ◽  
Prompt Neutron ◽  
Neutron Fission

Cumulative Yields of the Heavy Fragments in the Fast Neutron Fission of 238U

1972 ◽  
Vol 50 (24) ◽  
pp. 3100-3110 ◽  
Author(s):  
C. K. Mathews ◽  
R. H. Tomlinson
Keyword(s):  
Isotope Dilution ◽  
Mass Range ◽  
Mass Region ◽  
Mass Spectrometric ◽  
Spectrometric Method ◽  
Mass Spectrometric Method ◽  
Neutron Fission ◽  
Fission Spectrum ◽  
Isotopic Abundances ◽  
Fission Yields

Isotopic abundances of the elements xenon, cesium, barium, cerium, neodymium, and samarium formed in the fast (fission spectrum) neutron fission of 238U have been measured using the mass spectrometric method. These ratios were normalized with respect to each other through isobaric nuclides and isotope dilution to obtain the relative yields of isobaric chains in the heavy mass region. By normalizing the heavy mass yields to 100%, the absolute fission yields of 20 chains in the 130–154 mass range were determined.

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