Abstract
The analysis of various non-destructive methods to control fissile materials (FM) in large-size containers filled with radioactive waste (RAW) has been carried out. The difficulty of applying passive gamma-neutron monitoring FM in large containers filled with concreted RAW is shown. Selection of an active non-destructive assay technique depends on the container contents; and in case of a concrete or iron matrix with very low activity and low activity RAW the neutron radiation method appears to be more preferable as compared with the photonuclear one.
Highlights
According to the current regulations in the Russian Federation any radioactive wastes (RAW) must be certified before their disposal [1]
By the present time over 500,000,000 m3 of RAW have been stockpiled in the Russian Federation
The most part of RAW from Rosatom enterprises is loaded into much larger nonreturnable protective containers of NZK type [4] in the form of a hollow concrete rectangular parallelepiped of 165 cm × 165 cm × 134 cm external dimensions, having 11 cm thick walls, and of 3.5 t weight, which is filled with 3.2 t concrete matrix containing RAW. 235U and other fissile nuclides content in the matrix of such container can be at the level of a few grams and less
Summary
According to the current regulations in the Russian Federation any radioactive wastes (RAW) must be certified before their disposal [1]. The certification of RAW containers should include determination of fissile material (FM) content inside and is aimed to ensure safety of a repository for a long time. By the present time over 500,000,000 m3 of RAW have been stockpiled in the Russian Federation. A portion of low level wastes (LLW) of different classes is 99.97% of the total RAW volume [2]. Vast majority of RAW (> 95%) contains fission products which complicates FM certification. 235U and other fissile nuclides content in the matrix of such container can be at the level of a few grams and less The most part of RAW from Rosatom enterprises is loaded into much larger nonreturnable protective containers of NZK type [4] in the form of a hollow concrete rectangular parallelepiped of 165 cm × 165 cm × 134 cm external dimensions, having 11 cm thick walls, and of 3.5 t weight, which is filled with 3.2 t concrete matrix containing RAW. 235U and other fissile nuclides content in the matrix of such container can be at the level of a few grams and less
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