Authors & Affiliations
Vasiliev B.A., Farakshin M.R., Belov S.B., Kiselev A.V.
Afrikantov Experimental Design Bureau for Mechanical Engineering, Nizhny Novgorod, Russia
Vasiliev B.A. – Chief Designer, Cand. Sci. (Tech.), Afrikantov Experimental Design Bureau for Mechanical Engineering.
Farakshin M.R. – Head of the Department, Cand. Sci. (Tech.), Afrikantov Experimental Design Bureau for Mechanical Engineering.
Kiselev A.V. – Design Engineer, Afrikantov Experimental Design Bureau for Mechanical Engineering.
When developing large fast neutron rectors (BN), the necessity to limit sodium void reactivity coefficient value stipulates the flatted core layout to be applied. Thus, H/D ratio of fuel part in the BN-1200 reactor is appr. 0.25. Peculiarities of such core configuration with account of its large diameter (appr. 4.2 m) necessitate additional analysis of spatial stability in the neutron flux distribution, distortions of which can happen when absorber rods of the control and protection system (CPS) are moved.
This paper presents results of computational examinations of spatial distortions of neutron flux distribution and operational characteristics of BN-1200 FSAs (power density, radiation damage) when shim rods and control rods are moved as per design.
Possible algorithm of CPS rod movement to compensate for burn-up reactivity loss is considered. Maximum spatial distortions of the neutron field and power density are assessed that happen when this algorithm is implemented.
BN-1200 reactor, core, control and protection system, absorber rods, neutron flux distribution, distortions
1. Vasileev B.A., Farakshin M.R., Belov S.B., Kiselev A.V. Specific features of BN-1200 core in case of use of nitride or MOX fuel. Proc. Int. Conf. on Fast Reactors and Related Fuel Cycles, FR-17. Yekatirinburg, Russia, 2017.