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

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.
Authors:
 [1] ;  [1] ;  [1]
  1. Texas A & M Univ., College Station, TX (United States). Dept. of Nuclear Engineering
Publication Date:
OSTI Identifier:
1261241
Report Number(s):
INL/EXT--16-38059
TRN: US1601585
DOE Contract Number:
AC07-05ID14517
Resource Type:
Technical Report
Research Org:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Contributing Orgs:
Texas A & M Univ., College Station, TX (United States)
Country of Publication:
United States
Language:
English
Subject:
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