Izvestiya vuzov. Yadernaya Energetika

The peer-reviewed scientific and technology journal. ISSN: 0204-3327

Radiation characteristics of REMIX-fuel multirecycling in VVER-1000 reactor

3/28/2016 2016 - #01 Fuel cycle and nuclear waste management

Postovarova D.V. Kovalev N.V. Onegin M.S. Bibichev B.A.

DOI: https://doi.org/10.26583/npe.2016.1.11

UDC: 621.039.5

In this article REMIX fuel multirecycling in VVER 1000 reactor is considered. The REMIX fuel is a mixture of regenerated uranium and plutonium with enriched uranium. Multirecycling of regenerated uranium and plutonium in thermal reactors can provide more effective use of nuclear fuel, reducing the volume of spent nuclear fuel destined for disposal, and reducing the risk of proliferation of nuclear materials. However, recycling of plutonium leads to accumulation of its non fissile isotopes, and recycling of uranium leads to accumulation of 232U. This leads to deterioration of the radiation characteristics of fuel assemblies with fresh fuel. The changes in the isotopic composition of a three types of REMIX fuel during multirecycling in VVER 1000 reactor was calculated. It is shown that for REMIX

A and REMIX A2 fuel more than five recycling are possible without significantly fuel degradation. Equivalent dose from fresh REMIX fuel assembly was calculated depending on the number of cycles and on the time between fuel manufacture and fuel rod loading.

Equivalent dose near the fuel assembly is the important characteristic of radiation danger of nuclear fuel. The relative contribution of different radio nuclides to the equivalent dose was determined. Calculation results concerning the accumulation of 232U and non fissile Pu isotopes depending on the number of recycles are presented.

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REMIX fuel fuel cycle water moderated water cooled power reactor uranium plutonium uranium multirecycling plutonium multirecycling isotope composition equivalent dose spent nuclear fuel