Abstract
After the occurrence of severe accident of Fukushima nuclear power plants, the world has put big pressure and concern on nuclear safety. Especially, the ability of decay heat removal from the reactor core has become the most important issue. AP-1000 type power plant is developed and designed by Westinghouse. It is designed with passive safety concepts, which could remove the decay heat from the core without outside forces. MAAP 5 code is a powerful tool that is used in nuclear power plant severe accident safety analysis. It can simulate the accident sequences in short time. To make MAAP 5 code be able to simulate sequences for AP-1000 type nuclear power plant, the first thing needs to do is to establish parameter file in MAAP 5 code. This study modifies ZION5.PAR model, which is the original model built in MAAP 5 code. This modification starts from reactor core to AP600 which includes reactor core, containment, reactor primary system, control parameters and AP600. However, parameter file in MAAP 5 code is a huge file which contains lots of parameters. There are some difficulties of finding suitable data to use from AP-1000 design control document since it did not provide enough detail design information of AP-1000. Under this condition, this study uses Maanshan Power Plant data as the substitute during model establishment. Meanwhile, the model was running and adjusting to reach steady state conditions as the AP-1000 input file and make sure it is able to use in further transient analysis of MAAP 5 code. After the modification of ZION5.PAR file, the newly constructed AP-1000 input file is able to simulate steady state. In future, it could be used as a base to build new model that is capable of simulate transients by correcting some values of parameters of this file. Like the detail data of AP-1000 is published later on, Maanshan Power Plant data could be replaced by correct data in the model. Hopefully, recent AP-1000 file may generate reasonable analytical results by MAAP 5 code and can provide useful referential results to the referees