The potentially large subcriticality margin of an ADS should allow the introduction of very significant quantities of waste products such as Minor Actinides and Long-Life Fission Products, which generally have a negative impact on the safety of a critical core. The present work is inserted in the framework of the XADS project. This document analyses, by means of deterministic methods (special procedures MECONG that make use of some ERANOS modules), the LBE-cooled XADS core completely loaded with special elements, which contain a great quantity of minor actinides. The material composition of the special element (pratically a U-free oxide fuel inserted in a Magnesium-Oxide matrix) has been provided by C.E.A. and it is the same that has been used in He-cooled XADS. With a 930-day fuel cycle and for a 20-cycle multi-recycling, three power levels are investigated: 80, 200 and 400 MWth. For each power level considered, the time evolution of some neutronic characteristics are analysed like the reactivity variation cycle by cycle and per day, the neutron spectrum, the maximum and average burn-up, inner and outer core flux, the enrichment at beginnig of life. The most important aspect highlighted, is to verify the capability of this subcritical system to burn plutonium and transmute minor actinides for each cycle and consequently the quantity of plutonium and of minor actinides that is necessary to supply at beginning of each cycle to restore the initial reactivity level. Different power levels for the most important neutronic parameters are compared, above all concerning the transmutation and the burn-up rate.

Preliminary Analysis about the Possibility to Adopt Special Assemblies with Minor Actinides in the LBE-Cooled XADS Core ENEA Contribution to Deliverable 72

Peluso, V.
2004-10-19

Abstract

The potentially large subcriticality margin of an ADS should allow the introduction of very significant quantities of waste products such as Minor Actinides and Long-Life Fission Products, which generally have a negative impact on the safety of a critical core. The present work is inserted in the framework of the XADS project. This document analyses, by means of deterministic methods (special procedures MECONG that make use of some ERANOS modules), the LBE-cooled XADS core completely loaded with special elements, which contain a great quantity of minor actinides. The material composition of the special element (pratically a U-free oxide fuel inserted in a Magnesium-Oxide matrix) has been provided by C.E.A. and it is the same that has been used in He-cooled XADS. With a 930-day fuel cycle and for a 20-cycle multi-recycling, three power levels are investigated: 80, 200 and 400 MWth. For each power level considered, the time evolution of some neutronic characteristics are analysed like the reactivity variation cycle by cycle and per day, the neutron spectrum, the maximum and average burn-up, inner and outer core flux, the enrichment at beginnig of life. The most important aspect highlighted, is to verify the capability of this subcritical system to burn plutonium and transmute minor actinides for each cycle and consequently the quantity of plutonium and of minor actinides that is necessary to supply at beginning of each cycle to restore the initial reactivity level. Different power levels for the most important neutronic parameters are compared, above all concerning the transmutation and the burn-up rate.
Rapporto tecnico;Reattori sottocritici/ADS;Neutronica;Metodi deterministici per la neutronica
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12079/7074
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