Application of gaseous absorbers for testing the fuel elements in nonstationary regimes

A possibility of operative local control of power release in loop channels of a research reactor MR by means of a gaseous neutron absorber with 3He being of use as absorber is studied. The gas control system intended for the study of the WWER-1000 reactor fuel element serviceability in transients is described. The calculation-experimental investigation results of the dependence of power change of an experimental heat-generating assembly and reactivity on 3He pressure in the channel are presented. A conclusion on satisfactory efficiency of the described gas control system is made on the base of the analysis of the results obtained