By Topic

Criticality of Oklo Natural Reactors: Realistic Model of Reaction Zone 9

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

6 Author(s)
Bentridi, S.E. ; Lab. d'Hydrologie et Geochim. de Strasbourg, Strasbourg, France ; Gall, B. ; Gauthier-Lafaye, F. ; Seghour, A.
more authors

Explanation of the so-called Oklo phenomenon can only be found by associating neutron physics and geological observations. The framework of Reactor Zone #9 (RZ9) from the Oklo uranium deposit in Gabon is discussed. A realistic model of RZ9 is proposed and studied with present-day numerical tools. Anchor points for this model are set by means of a selection of relevant parameters acting on geological conditions and neutron-transport physics, including ore homogeneity, initial reactor thickness, reflector effect and initial neutron poison content. Based on Monte Carlo simulations, the present modeling enables discussion of start-up conditions of the RZ9 reactor at optimal overlap of two opposing long-term processes: geochemical enrichment of the uranium content of the ore and its progressive impoverishment in 235U. On the basis of the present work, the inception and operation of Oklo natural reactors can be discussed from the largest to smallest initial core size, whereas before, only the largest ones had found some explanation.

Published in:

Nuclear Science, IEEE Transactions on  (Volume:60 ,  Issue: 1 )