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

Technical Report · Mon Feb 29 00:00:00 EST 2016

DOI:https://doi.org/10.2172/1261241· OSTI ID:1261241

Prince, Zachary M. ^[1]; Ragusa, Jean C. ^[1]; Wang, Yaqi ^[1]

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

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.

• Research Organization: Idaho National Lab. (INL), Idaho Falls, ID (United States)
• Sponsoring Organization: USDOE Office of Nuclear Energy (NE)
• Contributing Organization: Texas A & M Univ., College Station, TX (United States)
• DOE Contract Number: AC07-05ID14517
• OSTI ID: 1261241
• Report Number(s): INL/EXT-16-38059; TRN: US1601585
• Country of Publication: United States
• Language: English

Related Subjects

97 MATHEMATICS AND COMPUTING
22 GENERAL STUDIES OF NUCLEAR REACTORS
TIME DEPENDENCE
SPACE DEPENDENCE
SHAPE
IMPLEMENTATION
DIFFUSION
KINETICS
FITIE ELEMENT METHOD
ACCURACY
PERFORMANCE
TESTING
R CODES
quasistatic
Rattlesnake
reactor
transient