IMPACT OF LEAD-208 AS COOLANT ON NEUTRON CHARACTERISTICS OF THE FAST REACTOR CORE

Authors & Affiliations

Blokhin D.А., Zemskov E.A., Khorasanov G.L.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia

Abstract

In the paper neutron spectra of fast reactor cooled with lead– bismuth or lead-208 are given. It is shown that in changing the coolant from lead-bismuth to lead-208 the core neutron spectra of the FR RBEC-M are hardening in whole on several percents while a little share of low energy neutrons (5 eV – 50 keV) is slightly increasing. Neutron spectra hardening and low neutron absorption in the coolant permit to increase the effective neutron multiplication factor, Kef, while the increased share of low energy neutrons provides more effective conversion of uranium-238 or technetium-99 due to peculiarity of their neutron capture cross sections.

Keywords
lead-208, coolant, lead-bismuth, neutron fluxes, effective neutron multiplication factor, neutrons, range, intermediate-energy neutrons, thermal neutrons, fast neutrons

Article Text (in Russian, PDF)

References

UDC 621.039.546

Problems of Atomic Science and Technology. Series: Nuclear Constants, issue 1-2, 2010