scholarly journals Benchmark critical experiments on low-enriched uranium oxide systems with H/U = 0. 77

1979 ◽  
Author(s):  
G Tuck ◽  
I Oh
Keyword(s):  
Uranium Oxide ◽  
Oxide Systems ◽  
Enriched Uranium

Improved-Trapped Magnetic Fields in Top Seeded Melt Grown YBCO Superconductor Doped with Depleted and Enriched Uranium Oxide

2003 ◽  
Vol 426-432 ◽  
pp. 3499-3504 ◽  
Author(s):  
D.A. Cardwell ◽  
N. Hari Babu ◽  
M. Kambara ◽  
Y.H. Shi ◽  
C.D. Tarrant ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Uranium Oxide ◽  
Ybco Superconductor ◽  
Enriched Uranium

Uranium Workshops Dismantling and Criticality Control

2011 ◽  
Author(s):  
Pierre Lisbonne ◽  
Julie Rosello
Keyword(s):  
Risk Management ◽  
Uranium Oxide ◽  
Chemical Processes ◽  
Process Equipment ◽  
Fissile Material ◽  
Nuclear Facility ◽  
Southern France ◽  
Management Procedures ◽  
Enriched Uranium

Within the CEA at Cadarache Research Center located in southern France, the ATUE, standing for Ateliers de Traitement de l’Uranium Enrichi (Enriched Uranium Treatment Workshops), is a nuclear facility started in 1965 and shut down in 1995. Various chemical processes were in operation in the ATUE in order to product enriched uranium oxide intended for fast breeders and naval propulsion reactors. According to the mass of fissile material, the most contaminated process equipment has already been dismantled under criticality risk management procedures. Cleanup of the building and dismantling of the remaining equipment, such as ventilation and electricity network, are now in progress without any constraint regarding criticality, thanks to in-situ measurement and calculations. Criticality management and how we finally proved the risk was over, as well as the strategy under French rules for final decommissioning of the facility leading to “brown field” will be presented.

scholarly journals Neutronic Performance of the VVER-1000 Reactor Using Thorium Fuel with ENDF Library

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Sonia M. Reda ◽  
Ibrahim M. Gomaa ◽  
Ibrahim I. Bashter ◽  
Esmat A. Amin
Keyword(s):  
Uranium Oxide ◽  
Delayed Neutron ◽  
Reactor Operation ◽  
Plutonium Isotopes ◽  
The Core ◽  
Reactivity Coefficients ◽  
Design Values ◽  
Enriched Uranium ◽  
Neutronic Performance ◽  
Lower Production

In this paper, neutronic calculations and the core analysis of the VVER-1000 reactor were performed using MCNP6 code together with both ENDF/B-VII.1 and ENDF/B-VIII libraries. The effect of thorium introduction on the neutronic parameters of the VVER-1000 reactor was discussed. The reference core was initially filled with enriched uranium oxide fuel and then fueled with uranium-thorium fuel. The calculations determine the delayed neutron fraction βeff, the temperature reactivity coefficients, the fuel consumption, and the production of the transuranic elements during reactor operation. βeff and the Doppler coefficient (DC) are found to be in agreement with the design values. It is found that the core loaded with uranium and thorium has lower delayed neutron fraction than the uranium oxide core. The moderator temperature coefficients of the uranium-thorium core are found to be higher than those of the uranium core. Results indicated that thorium has lower production of minor actinides (MAs) and transuranic elements (mainly plutonium isotopes) compared with the relatively large amounts produced from the uranium-based fuel UO2.

scholarly journals Subcritical Measurements of Water-Moderated Highly Enriched Uranium Oxide MTR Type Fuel

2018 ◽  
Author(s):  
Anthony J. Nelson ◽  
Soon S. Kim ◽  
Jerome M. Verbeke ◽  
William J. Zywiec
Keyword(s):  
Uranium Oxide ◽  
Enriched Uranium ◽  
Type Fuel

Test Results Using a Bell Jar to Measure Containment Vessel Pressurization

2002 ◽  
Author(s):  
S. J. Hensel ◽  
G. C. Rodrigues
Keyword(s):  
Direct Contact ◽  
Uranium Oxide ◽  
Test Results ◽  
Linear Extrapolation ◽  
Shipping Container ◽  
Containment Vessel ◽  
Bearing Materials ◽  
Enriched Uranium ◽  
One Year

A bell jar is used to determine containment vessel pressurization due to outgassing of plutonium materials. Fifteen food cans containing plutonium bearing materials, including plutonium packaged in direct contact with plastic and plutonium contaminated enriched uranium oxide have been tested to date. As expected, minimal pressurization occurs and in some cases a slight depressurization has been observed. Linear extrapolation of the greatest pressurization observed in the bell jar to a typical drum shipping container (such as a 9975) has been performed. Pressurization from this particular can packaged for one year in a 9975 container is negligible.

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