Application of the RELAP5 code for analysis of the consequences of failures in a nuclear power plant

Program RELAP5 na osnovu matematičkih operacija i rješavanjem diferencijalnih jednadžbi dolazi do simuliranja stvarnih prilika za vrijeme nesreća u nuklearnim elektranama s lakovodnim reaktorom. Promatra se stacionarno stanje prije nesreće, te stanja do kojih dođe za vrijeme nesreća kao što su velika LOCA i mala LOCA. Za vrijeme tih nesreća dolazi do gubitka rashladnog sredstva. Kriterij projektiranja sustava za zaštitno hlađenje jezgre zasniva se na pregrijavanju površine gorivnih elemenata iznad 1477 K pri najnepovoljnjem slučaju loma primarnog cjevovoda. Promatran je minimalni protok koji neće dozvoliti prekoračenje zadane temperature.Program RELAP5 is based on mathematical operations and solving differential equations. It simulates real conditions during an accident in nuclear power plants with a light-water reactor. It is observed the steady state before the accident, as well as the conditions that occur during the accident, such as the large and small LOCA. Coolant loss occurs during these accidents. To design a core protective cooling system there is a criterion based on overheating above 1477 K in the worst case. It was observed a minimum flow that would not allow that temperature to be exceeded