Seyed Mahdi Mostashiri - University of Amirkabir Industrial, Tehran, Iran
Ali Haghighi Shad - University of Amirkabir Industrial, Tehran, Iran
Heidar Abbasi - heidar.abbasi@yahoo.com
Narges Ghasempoor - Hakim Sabzevari University, Applicable physic - elementary particle physic, Iran

The Best Estimate analysis consists of a coupled thermal-hydraulic and neutronic description of the nuclear system’s behavior; uncertainties from both aspects should be included and jointly propagated. This paper presents a study of the influence of the uncertainty in the macroscopic neutronic information that describes a three-dimensional core model on the most relevant results of the simulation of a Reactivity Induced Accident (RIA). The analyses of a BWR-RIA and a PWR-RIA have been carried out with a three-dimensional thermalhydraulic and neutronic model for the coupled system TRACE-PARCS and RELAP-PARCS.

Uncertainty analysis, Neutronic parameters, BWR, PWR