Springer Nature is making SARS-CoV-2 and COVID-19 research free. View research | View latest news | Sign up for updates

Reactivity Determination with One Neutron Detector in a Transport-PWR Core

  • 8 Accesses

Neutronics measurements are regularly conducted during operation in order to evaluate the physical characteristics of the core. A nonstandard reactimeter connected to a backup neutron detector is used to perform the measurements. A calculation of the reactivity on the basis of the indications of a single detector results in distortion of the true value of the reactivity because of spatial effects. A method of increasing the accuracy of the reactivity calculations by taking account of the changes in the efficiency of the ionization chamber is proposed. Software for performing the required calculations has been developed. The correctness of the proposed solution was checked and confirmed by experiments performed on a critical stand at OKBM Afrikantov using the core of an icebreaker reactor.

This is a preview of subscription content, log in to check access.


  1. 1.

    J. Kipin, Physical Principles of Reactor Kinetics, Atomizdat, Moscow (1967).

  2. 2.

    N. A. Vinogradov, “Spatial effect as a consequence of the disparity between the detector signal and the average neutron flux density,” At. Energ., 114, No. 1, 8–13 (2013).

  3. 3.

    A. M. Zhukov, Minimization of the Influence of Spatial Effects on Reactivity Measurements in Next-Generation Fast Reactors, GNTs RF – FEI, Obninsk (2012).

Download references

Author information

Correspondence to A. V. Belin.

Additional information

Translated from Atomnaya Énergiya, Vol. 127, No. 1, pp. 51–53, July, 2019.

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Belin, A.V., Sosnin, M.A., Vasyatkin, A.G. et al. Reactivity Determination with One Neutron Detector in a Transport-PWR Core. At Energy 127, 60–63 (2019). https://doi.org/10.1007/s10512-019-00585-3

Download citation