Publicatie Laka-bibliotheek:
Thorium-based fuels preliminary lattice cell studies for CANDU reactors

AuteurC.Margeanu, A.Rizoiu, Institute for nuclear Research Pitesti
6-01-2-70-02.pdf
Datumnovember 2009
Classificatie 6.01.2.70/02 (THORIUM CYCLUS)
Voorkant

Uit de publicatie:

              Proceedings of the 7th Conference on Nuclear and Particle Physics,
                         11-15 Nov. 2009, Sharm El-Sheikh, Egypt




 THORIUM-BASED FUELS PRELIMINARY LATTICE CELL
         STUDIES FOR CANDU REACTORS

                            C.A. Margeanu and A.C. Rizoiu

                    Institute for Nuclear Research Pitesti, Romania



       Applying once-through Thorium (OTT) cycle in existing and advanced CANDU reactors
might be seen as an evolutive concept for sustainable development both from economic and
waste management points of view. Using the Canadian proposed scheme - loading mixed
ThO2-SEU CANFLEX bundles in CANDU 6 reactors - simulated at lattice cell level led to
promising conclusions on higher burnup, minor actinide content reduction in spent fuel,
reduction of spent fuel radiotoxicity, presence of radionuclides emitting strong gamma
radiation for proliferation resistance benefit. The calculations were performed by using WIMS
and DRAGON codes (together with corresponding nuclear data library based on ENDF/B-VII).

Keywords: Thorium-based fuels, CANDU reactors, spent fuel radiotoxicity, proliferation
resistance, sustainable development.t


                                       INTRODUCTION

      The choice for nuclear power as a major contributor to the future global energy needs
must take into account acceptable risks of nuclear weapon proliferation, in addition to
economic competitiveness, acceptable safety standards, and acceptable waste disposal
options. The main reasons for our interest in Thorium-based fuel cycles have been, globally,
to extend the energy obtainable from natural Uranium and, locally, to provide a greater
degree of energy self-reliance.
      The Thorium terrestrial reserves are estimated to be about 4 times larger than Uranium
ones (India, Brazil, Turkey, India, United States, Norway boast of large and very rich
Thorium beds); Thorium is widely distributed in nature as an easily exploitable resource in
many coun