Modeling of NPP Krsko Primary Components Using TRACE Code

U radu su navedene osnovne karakteristike programa TRACE i predprocesora SNAP te je opisan način formiranja ulaznih podataka primarnih komponenata za TRACE nodalizaciju NE Krško. Referentni podaci su preuzeti iz postojeće nodalizacije NE Krško za program RELAP5 koja je razvijena na FER ZVNE. Opisan je način izrade hidrauličkih komponenata, toplinskih struktura i kontrolnih sustava u programu TRACE. Proveden je parcijalni proračun parogeneratora u stacionarnom stanju te su rezultati uspoređeni s rezultatima dobivenim programom RELAP5. Proračun stacionarnog stanja cijele elektrane je proveden ali rezultati pokazuju prevelika odstupanja i nisu prikazani u radu. Napravljen je proračun ispada primarnih pumpi programom RELAP5 kao priprema za kasniju tranzijentnu verifikaciju programa TRACE.This work presents basic characteristics of thermal-hydraulic code TRACE and preprocessor SNAP, as well as a way of preparation TRACE input file for NPP Krško primary components. Referent data were taken from existing NPP Krško nodalization for program RELAP5, which was developed at FER ZVNE. The document describes methods and procedures used while creating hydraulic components, heat structures and control systems model in TRACE. Partial steady – state calculation was performed and the results were compared with the results obtained with the RELAP5 program. The steady state calculation of whole plant model was performed, but obtained results show large differences compared to reference results and are not shown in the thesis. Loss of power to reactor coolant pumps transient was calculated for NPP Krsko using RELAP5 code to prepare the data needed for later on-transient verification of TRACE code