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One by-product in nuclear fission, when nuclear fuel is radiated, is the very toxic 237Np isotope which has a long active life (2.4 x 1.0 E6 years). This paper studies a procedure to decrease its period of activity by using it as an integral part of the nuclear fuel, thus making possible its elimination either through fission or by neutronic capture. A zone of the tertiary diagram in the phases of the U-Zr-Np system has been under scrutiny in order to predict the nature and the structural changes which the system undergoes when subjected to three different temperatures, and to evaluate the effect of the 237Np in metallic fuel for fast breeders. It has been noted that: (i) two phase transformations take place within the same temperature range; (ii) solid solutions, not tertiary compounds, appear in the alloys under investigation; (iii) solid Np within the U-Zr alloy is very soluble, making possible its addition to metallic fuels and thus its elimination in fast breeders.

Additional information

Authors: JULIAN RODRIGUEZ R, JRC Karlsruhe (DE);SARI C, JRC Karlsruhe (DE);CRIADO PORTAL A J, Universidad Complutense de Madrid, Departamento CC. de los Materiales e Ingeniería Metalúrgica (ES)
Bibliographic Reference: Paper presented: XIX Annual Meeting of the Spanish Nuclear Society, Caceres (ES), October 6-8, 1993
Availability: Available from (1) as Paper ES 37881 ORA
Record Number: 199311353 / Last updated on: 1994-11-28
Original language: es
Available languages: es
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