Long Term Evolution of Spent Nuclear Fuel in Long Term Storage or Geological Disposal: Status of the French Research Program PRECCI

This paper aims to give an overview of the current status of the French R&D program devoted to the understanding of the long term evolution of spent nuclear fuel in conditions of long term storage (100’s years) and deep geological disposal (10’000’s years). This programs aims to get the scientific and technical data allowing to answer the very generic operational questions which are related to the designing of storage or disposal facilities and which are addressed to the R&D. Main results but also scientific issues are presented and discussed in order to enlighten the expected long term evolution scenario for spent fuel in storage and disposal.