Izvestiya vuzov. Yadernaya Energetika

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

Development of neutron spectrum analysis method to assess the content of fissile isotopes in SFA

5/11/2014 2014 - #03 Modelling processes at nuclear facilities

Mitskevich A.V.

DOI: https://doi.org/10.26583/npe.2014.3.09

UDC: 53.082.79

The paper presents the integrated neutron spectrum analysis as a potential method for estimating the contents of fissile isotopes in SFAs. Two method implementation variants are described: (1) measurement of SFA average transmission and (2) measurement of sample average transmission in the spectrum that has passed a SFA. The authors describe the dependences of SFA average transmission on its content of the required isotope obtained by means of two types of detectors: helium counter tube and fission chamber. Also, the authors propose a method to estimate SFA burn-up by means of the integrated NSA. In addition, SFA residence time influence on transmission is estimated.

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spent fuel neutron spectrum analysis 235U and 239Pu content assessment helium counter tube fission chamber transmission fuel assembly residence time