Improved Quasi-Static Method: IQS Method Implementation for CFEM Diffusion in Rattlesnake

Prince, Zachary M.¹  Ragusa, Jean C.¹  Wang, Yaqi¹ 

[1] Texas A & M Univ., College Station, TX (United States). Dept. of Nuclear Engineering

关键词: TIME DEPENDENCE;    SPACE DEPENDENCE;    SHAPE;    IMPLEMENTATION;    DIFFUSION;    KINETICS;    FITIE ELEMENT METHOD;    ACCURACY;    PERFORMANCE;    TESTING;    R CODES quasistatic;    Rattlesnake;    reactor;    transient;   

DOI  :  10.2172/1261241
RP-ID  :  INL/EXT--16-38059
PID  :  OSTI ID: 1261241
Others  :  TRN: US1601585

美国|英语

来源: SciTech Connect

【 摘 要 】

The improved quasi-static (IQS) method is a transient spatial kinetics method that involves factorizing flux into space- and time-dependent components. These components include the flux???s power and shape. Power is time-dependent, while the shape is both space- and time-dependent. However, the impetus of the method is the assumption that the shape is only weakly dependent on time; therefore, the shape may not require computation at every time step, invoking the quasi-static nature. This paper describes the implementation and testing of IQS as an alternative kinetics solver within Rattlesnake to provide improved time performance with minimal reduction in accuracy.