Effect of inhomogeneities inserted into fuel assembly in the VVER-1000 mock-up on the LR-0 research reactor

The work presents a detailed comparison of the calculated and experimentally determined effect of inhomogeneities inserted into a fuel assembly on power density in the adjoining fuel pins. The power density is determined by means of fission density. The fission density was determined using measurements of photons emitted by the decay of the 92Sr fission product, which has been produced during a 2.5 h irradiation at a power level of 9.41 W. Experiments were performed in the VVER-1000 mock-up placed in LR-0 reactor. The calculations were made using the Monte Carlo approach. The effect of different data libraries on results are discussed as well.