Table of Contents
International Journal of Nuclear Energy
Volume 2014, Article ID 410715, 9 pages
Research Article

Simulation of the Westinghouse AP1000 Response to SBLOCA Using RELAP/SCDAPSIM

1Nuclear & Radiation Engineering Department, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt
2Centre for Nuclear Energy Technology, University of Manchester, Manchester, M13 9PL, UK
3Innovative Systems Software (ISS), Ammon, ID 83406, USA

Received 20 August 2014; Revised 23 November 2014; Accepted 23 November 2014; Published 16 December 2014

Academic Editor: Arkady Serikov

Copyright © 2014 Ayah Elshahat et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Great interest is given now to advanced nuclear reactors especially those using passive safety components. The Westinghouse AP1000 Advanced Passive pressurized water reactor (PWR) is an 1117 MWe PWR designed to achieve a high safety and performance record. The AP1000 safety system uses natural driving forces, such as pressurized gas, gravity flow, natural circulation flow, and convection. In this paper, the safety performance of the AP1000 during a small break loss of coolant accident (SBLOCA) is investigated. This was done by modelling the AP1000 and the passive safety systems employed using RELAP/SCDAPSIM code. RELAP/SCDAPSIM is designed to describe the overall reactor coolant system (RCS) thermal hydraulic response and core behaviour under normal operating conditions or under design basis or severe accident conditions. Passive safety components in the AP1000 showed a clear improvement in accident mitigation. It was found that RELAP/SCDAPSIM is capable of modelling a LOCA in an AP1000 and it enables the investigation of each safety system component response separately during the accident. The model is also capable of simulating natural circulation and other relevant phenomena. The results of the model were compared to that of the NOTRUMP code and found to be in a good agreement.