Point kinetics model characteristics in TRACE code

Opisane su fizikalne osnove modela točkaste kinetike. Opisani su načini rješavanja jednadžbi točkaste kinetike u programima TRACE i RELAP5. Razvijen je i testiran program kh9a kako bi se omogućio bolji uvid u fizikalnu pozadinu modela točkaste kinetike. Proveden je proračun koeficijenata reaktivnosti za ciklus 31 nuklearne elektrane Krško. Dobiveni podaci korišteni su kao ulazni podaci za rad programa TRACE. Opisan je TRACE model korišten za testiranje jednadžbi točkaste kinetike te njegovi ulazni podaci. U TRACE-u je proveden proracun stacionarnog stanja bez poremećaja, zatim proračuni tijekom uvlačenja i izvlačenja kontrolnih šipki te proračun brze obustave reaktora.The physical foundations of the point kinetics model are described. Ways of solving point kinetics equations in the TRACE and RELAP5 programs are described. The kh9a program was developed and tested to provide a better insight into the physical background of the point kinetics model. The calculation of reactivity coefficients for cycle 31 of the Krško nuclear power plant was performed. The obtained data were used as input data for the operation of the TRACE program. The TRACE model used to test point kinetics equations and its input data are described. In TRACE, the calculation of the steady state without disturbances was performed, followed by the calculations during the insertion and extraction of the control rods and the calculation of the rapid shutdown of the reactor