The criticality of VVER-1000 mock-up with different H3BO3 concentration

Adequate and accurate determination of multiplication coefficient is not a simple task. In the case of fuel facilities or reactor core designs as well as in the case of emergency shut-down system calculations keff overestimation may lead to an unduly conservative approach. In this paper the critical levels for VVER-1000 mock-up, assembled on zero-power reactor LR-0, with various concentrations of boric acid are presented. These experimental data are compared with calculations in different nuclear data libraries.