Transport Properties of Gaseous and Volatile Fission Products in Thoria-based Fuels

Chapter
Part of the Green Energy and Technology book series (GREEN)

Abstract

Transport properties of gaseous and volatiles that constitute a significant fraction of the total fission products (FPs) in high burnup matrix play important role in the performance of nuclear fuel. The transport decides release and retention behaviors of the FPs and in turn governs the matrix swelling and mechanical interaction with clad. A detailed understanding of the various factors involved in the overall transport process of the individual species inside a dense fuel matrix is necessary in predicting the performance of a fuel in high burnup. An introduction to the well-established factors governing the thermal and athermal transports of gas and volatile FPs in the conventionally used urania-based fuels in high burnup is made at the beginning of this chapter, before elaborating the case of thoria-based fuels. The experimentally measured diffusion properties of xenon, and corrosive volatile like iodine and tellurium inside thoria-based matrices, virgin as well as high burnup Simfuel, are included in the elaboration. The transport properties of the species are closely compared for the two fuels in order to understand their relative performances in high burnup situation. The knowledge of high burnup performance is particularly important for the thoria-based fuel that has limited recycling option due to the handling problems of high activity from hard gamma emitting daughters.

Keywords

Entropy Porosity Migration Enthalpy Uranium 

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Copyright information

© Springer-Verlag London 2013

Authors and Affiliations

  1. 1.Chemistry DivisionBhabha Atomic Research CentreMumbaiIndia

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