ASSEMBLAGE DE TRANSMUTATION ET CENTRALE NUCLEAIRE A REACTEUR RAPIDE L'UTILISANT

• Main Authors: FUJIMURA, KOJI, KAWASHIMA, KATSUYUKI, ITOOKA, SATOSHI
• Format: Patent
• Language: French
• Published: 27.07.2018
• Subjects: NUCLEAR ENGINEERING; NUCLEAR PHYSICS; NUCLEAR REACTORS; PHYSICS

PROBLEM TO BE SOLVED: To provide a nuclear transformation assembly capable of improving nuclear transformation efficiency of long-lived radioactive wastes such as minor actinide (MA), and a fast neutron reactor nuclear power plant system using the nuclear transformation assembly.SOLUTION: Nuclear transformation assemblies 5 that are loaded into a reactor core 22 of a fast neutron reactor and in each of which a plurality of fuel pins 6, 7, and 8 containing long-lived elements and a plurality of moderator pins 9 containing a neutron moderator are bundled together and contained in a wrapper tube 11 are each configured so that the plurality of fuel pins 6, 7, and 8 is arranged such that a cross-sectional area of fuel elements of the long-lived elements loaded into the fuel pins 6, 7, and 8 are smaller as being closer to a center of the nuclear transformation assembly 5. The fuel pins 6, 7, and 8 are arranged so as to satisfy d1≤d2≤d3, where d1 is a bore diameter of a hollow portion of each of the fuel pins 6 arranged in an outer circumferential portion of the nuclear transformation assembly 5, d3 is a bore diameter of a hollow portion of each of the fuel pins 8 arranged generally in a central portion of the nuclear transformation assembly 5, and d2 is a bore diameter of a hollow portion of each of the fuel pins 7 arranged between the fuel pins 6 and the fuel pins 8.