Gas flow in and out of a nuclear waste container

We analyze the flow of gases out of and into a high-level-waste container in the unsaturated tuff of Yucca Mountain. Containers are expected to fail eventually by localized cracks and penetrations. Even though the penetrations may be small, argon gas initially in the hot container can leak out. As the waste package cools, the pressure inside the container can become less than atmospheric, and air can leak in. {sup 14}C released from the hot fuel-cladding surface can leak out of penetrations, and air inleakage can mobilize additional {sup 14}C and other volatile radioactive species as it oxidizes the fuel cladding and the spent fuel. In an earlier paper we studied the gas flow through container penetrations occurring at the time of emplacement. Here we analyze the flow of gas for various penetration sizes occurring at 300 years. 3 refs., 2 figs

Fertility history and post-reproductive survival in a longevous population

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L'autonomie à l'échelle d'un territoire repensée à travers la complémentarité de systèmes d'exploitation agricole

Projet Cantogether sur le bassin versant de l’AveyronNational audienceDu Ségala aveyronnais aux terrasses de Montauban - Caussade coule l’Aveyron. En amont, des élevages spécialisés bovin et ovin, lait ou viande. En aval, des grandes cultures. Circulez, il n’a rien à voir ? Pas si sûr pour l’INRA Toulouse, qui, dans le cadre du projet européen Cantogether, a étudié le développement d’un partenariat entre ces zones et systèmes de production. A la clé, une série d’enjeux économiques, environnementaux et sociaux..