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Title:
Inception and evolution of Oklo natural nuclear reactors
Authors:
Bentridi, Salah-Eddine; Gall, Benoît; Gauthier-Lafaye, François; Seghour, Abdeslam; Medjadi, Djamel-Eddine
Affiliation:
AA(UMR 7517, laboratoire d'hydrologie et de géochimie de Strasbourg, CNRS/université de Strasbourg, 1, rue Blessig, 67084 Strasbourg, France; Laboratoire de l'énergie et des systèmes intelligents, CUKM, route de Theniet, El-Hed 44225, Algeria), AB(UMR 7178, institut pluridisciplinaire Hubert-Curien, CNRS-IN2P3/université de Strasbourg, 23, rue du Loess, 67037 Strasbourg, France), AC(UMR 7517, laboratoire d'hydrologie et de géochimie de Strasbourg, CNRS/université de Strasbourg, 1, rue Blessig, 67084 Strasbourg, France), AD(Centre de recherches nucléaires d'Alger (CRNA), 2, boulevard Frantz-Fanon, 16000 Alger, Algeria), AE(École normale supérieure, Vieux-Kouba, 16050 Alger, Algeria)
Publication:
Comptes rendus - Géoscience, Volume 343, Issue 11, p. 738-748.
Publication Date:
11/2011
Origin:
ELSEVIER
Abstract Copyright:
(c) 2011 Académie des sciences
DOI:
10.1016/j.crte.2011.09.008
Bibliographic Code:
2011CRGeo.343..738B

Abstract

The occurrence of more than 15 natural nuclear Reactor Zones (RZ) in a geological environment remains a mystery even 40 years after their discovery. The present work gives for the first time an explanation of the chemical and physical processes that caused the start-up of the fission reactions with two opposite processes, uranium enrichments and progressive impoverishment in 235U. Based on Monte-Carlo neutronics simulations, a solution space was defined taking into account realistic combinations of relevant parameters acting on geological conditions and neutron transport physics. This study explains criticality occurrence, operation, expansion and end of life conditions of Oklo natural nuclear reactors, from the smallest to the biggest ones.
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