The determination of power distribution in the IRT-M modified core of the VVR-S reactor by using an experimental bundle

Within the action of changing the core of the Bucharest VVR-S reactor and of equipping it with IRT-M type elements, a method of determining the specific power distribution in the modified core by using an experimental bundle reproducing the IRT-M bundle geometry, was developed and tested. At the same time, by means of computing programs, a study was carried out on the influence of the experimental bundle on the VVR-S core parameters. The evolution of a short-lived fission product was studied in order to determine the power distribution. The results were compared with the data obtained from the calculated flux distribution. (author)