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Control of Fissile Materials in Gas Clearing and Pipelines


Development of Techniques of Nondestructive Assay of Fissile Materials by Neutron and Gamma Radiations in Gas Cleaning Systems and Gas Pipelines

Tech Area / Field

  • FIR-FUE/Reactor Fuels and Fuel Engineering/Fission Reactors
  • FIR-NSS/Nuclear Safety and Safeguarding/Fission Reactors

3 Approved without Funding

Registration date

Leading Institute
MIFI, Russia, Moscow

Supporting institutes

  • NPO Mayak, Russia, Chelyabinsk reg., Oziorsk


  • European Commission / Joint Research Center / Institute for Transuranium Elements, Germany, Karlsruhe\nForschungszentrum Jülich GmbH / Institut für Energieforschung, Germany, Jülich

Project summary

The purpose of the Project is to develop non-destructive assay methodologies for the control of nuclear material (NM) hold-ups in the processing units of the radiochemical plant RT-1 at the FSUE “PA Mayak”. These data are necessary for the NM control and account to assure on-plant nuclear safety. Up to date, no suitable methodologies of non-destructive assay on NM hold-ups are available at the plant.

In the course of the Project, NM gamma radiation is supposed to be measured using recently designed CdTe detectors having higher resolution and smaller sizes compared to NaI detectors conventionally applied for the hold-up control. The measuring instrumentation will be lightweight, with experimental data being more detailed and accurate. The above-listed properties of CdTe spectrometers allow discriminating NM radiation from other interfering radiations; measurement of several peaks from the same emitter will allow assessment of the NM hold-up thickness; measurements in restricted space will be possible as well. Certain preliminary measurements performed by the Project participants resulted in promising experimental data.

A set of methodologies will be developed to be applicable to the peculiarities of hold-ups in various equipment units and products under control. The methodologies will be certified and compared to similar developments applied at other plants; the range of application will be determined for the methodologies. The successful development of the methodologies will allow enhancing NM control at the FSUE “PA Mayak”, strengthening operational safety of the plant, and using the outcomes at other Russian and foreign enterprises of similar specialization.

The development of the Project will use the engineering know-how and experience in handling radioactive materials and NM measurements (including detection of NM hold-ups and, in some cases, determination of NM mass) that personnel of MEPhI and FSUE “PA Mayak”, including weapon scientists, gained as well as certain available experimental equipment and software tools.


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