THE MAIN CHARACTERISTIC OF THE EVOLUTION PROJECT SUPERVVER WITH SPECTRUM SHIFT REGULATION

P. Alekseev, V. Gorohov, P. Teplov, A. Chibiniaev, National Research Centre «Kurchatov Institute», Moscow, Russia

22nd Symposium of AER on VVER Reactor Physics and Reactor Safety (2012, Průhonice, Czech Republic)
NEW REACTOR CONCEPT

Abstract

The researches on the increase of achievable fuel burn-up in light water reactors with
so-called ?spectrum shift? had been carrying out in the world for a long time. The main idea
of the ?spectrum shift? is based on neutron spectrum shifting from the resonance region at the
beginning of the cycle to the thermal region at the end of the cycle. There are many different
ways of such regulation in the core ? starting from coolant density variation during reactor
company, to changing water-uranium ratio with some mechanical equipment. Spectral shift
regulation with depleted uranium or zirconium displacers is presented in this paper for
uranium and MOX fuel loadings. New fuel assemblies with special guide tubes for displacers
were developed for these purposes.

Presentation / full paper