Results 21 to 30 of about 248 (138)

EFFECTS OF FUEL DENSITY ON REACTIVITY COEFFICIENTS AND KINETIC PARAMETERS OF PEBBLE BED REACTOR

Urania, 2022
EFFECTS OF FUEL DENSITY ON REACTIVITY COEFFICIENTS AND KINETIC PARAMETERS OF PEBBLE BED REACTOR. Few decades ago a large number of nuclear reactors were designed to use HEU as the fuel.
Suwoto Suwoto, R. Andika Putra Dwijayanto, Wahid Luthfi, Zuhair Zuhair   +3 more
doaj   +1 more source

Impact of variable porosity models on the safety of high temperature pebble bed gas-cooled reactors

Brazilian Journal of Radiation Sciences, 2021
The Very High Temperature Reactor (VHTR) is one of the candidates of next generation of the nuclear reactors according to IAEA. Predicting the thermohydraulic behavior of High Temperature Reactors (HTR) is an important contribution to the development of ...
ABEL GÁMEZ RODRÍGUEZ, Leorlen Y Rojas Mazaira, Daniel Milian Perez, Dany Sanchez Dominguez, Carlos Rafael García Hernández, Carlos Alberto Brayner de Oliveira Lira   +5 more
doaj   +1 more source

Modelling of HTR (High Temperature Reactor) Pebble-Bed 10 MW to Determine Criticality as A Variations of Enrichment and Radius of the Fuel (Kernel) With the Monte Carlo Code MCNP4C

International Journal of Science and Engineering, 2015
Gas-cooled nuclear reactor is a Generation IV reactor which has been receiving significant attention due to many desired characteristics such as inherent safety, modularity, relatively low cost, short construction period, and easy financing.
Hammam Oktajianto, Evi Setiawati, Very Richardina   +2 more
doaj   +1 more source

Initial prediction of dust production in pebble bed reactors [PDF]

Mechanical Sciences, 2011
This paper describes the computational simulation of contact zones between pebbles in a pebble bed reactor. In this type of reactor, the potential for graphite dust generation from frictional contact of graphite pebbles and the subsequent transport of ...
M. Rostamian, S. Arifeen, G. P. Potirniche, A. Tokuhiro   +3 more
doaj   +1 more source

Evidence for the continental origin of Pliocene deposits in the central Baja California peninsula, Mexico, and implications for controls on biodiversity

Sedimentology, Volume 73, Issue 6, Page 2488-2518, October 2026.
ABSTRACT Previous studies have documented genetic divergence within the last few million years between northern and southern populations of terrestrial plants and animals along the Baja California peninsula, with many studies hypothesising that the divergence is due to an ancient seaway that crossed the central peninsula and created a physical barrier ...
Kevin K. Gardner, Rebecca J. Dorsey, Stephen T. Hasiotis, José Luis Antinao, Michael H. Darin, Scott E. K. Bennett, Matthew Heizler, Greer Dolby, Brian Hausback   +8 more
wiley   +1 more source

The Ames impact structure, Oklahoma: New radioisotopic constraints and implications for North American impact chronology

Meteoritics &Planetary Science, Volume 61, Issue 8, Page 2103-2139, August 2026.
Abstract The Ames impact structure (Oklahoma) is thought to have formed during the Ordovician Meteor Event, based on conodont biostratigraphy of its crater fill. Here, U–Pb zircon dates from its impact‐melt portion, conducted using secondary ion mass spectrometry and laser ablation–inductively coupled plasma–mass spectrometry (n = 37 spots), yield a ...
Elizabeth J. Catlos, Andrew F. Parisi, Michael E. Brookfield, Timmons Erickson, Sean P.S. Gulick, Axel K. Schmitt, Daniel F. Stockli, Daniel P. Miggins, Ben Ruchte, Mark Cloos   +9 more
wiley   +1 more source

Evaluation of radiation heat transfer in porous medial: Application for a pebble bed modular reactor cooled by CO2 gas [PDF]

Nuclear Technology and Radiation Protection, 2013
This work analyses the contribution of radiation heat transfer in the cooling of a pebble bed modular reactor. The mathematical model, developed for a porous medium, is based on a set of equations applied to an annular geometry.
Sidi-Ali Kamel, Oukil Khaled, Hassani Tinhinane, Amri Yasmina, Alem Abdelmoumane   +4 more
doaj   +1 more source

Kinetic Modeling and Analysis of Fuel Element Pneumatic Lifting System in Pebble Bed Reactors

Applied Sciences, 2023
Thousands of fuel elements in pebble-bed reactor are lifted one by one from the bottom to the top of the core by pneumatic conveying every day. Any failure in the transportation process may lead to a safety accident.
Peng Shen, Runfeng Zhang, Zhigang Wang, Jiangyi Chen   +3 more
doaj   +1 more source

Confirming the impact origin of the São Miguel do Tapuio structure, northeastern Brazil

Meteoritics &Planetary Science, Volume 61, Issue 7, Page 1263-1287, July 2026.
Abstract The São Miguel do Tapuio structure (SMT) is a remarkable, nearcircular feature of about 21 km diameter, centered at 5°37.6′ S, 41°23.3′ W in Piauí state, northeastern Brazil. The structure is located within the sedimentary strata of the Paleozoic–Mesozoic Parnaíba Basin and predominantly comprises sandstones of the Devonian Pimenteiras and ...
Alvaro Penteado Crósta, Neivaldo Araújo de Castro, Marcos Alberto Rodrigues Vasconcelos, Airton Natanael Coelho Dias, Ludovic Ferrière, Wolf Uwe Reimold, Ana Maria Góes, Jackson Alves Martins, Liliana Sayuri Osako, Raimundo Mariano Gomes Castelo Branco   +9 more
wiley   +1 more source

Heat transfer and fluid flow analysis of pebble bed and its verification with artificial neural network

Nuclear Materials and Energy, 2023
The advancement of sophisticated packed beds has significant implications for the development of new equipment for associated industries. Determining the heat transfer and fluid flow properties of the functional material in the form of a pebble bed is ...
Chirag Sedani, Paritosh Chaudhuri, Manoj Kumar Gupta   +2 more
doaj   +1 more source