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Argonne’s METL gears up to test more sodium fast reactor components
Argonne National Laboratory has successfully swapped out an aging cold trap in the sodium test loop called METL (Mechanisms Engineering Test Loop), the Department of Energy announced April 23. The upgrade is the first of its kind in the United States in more than 30 years, according to the DOE, and will help test components and operations for the sodium-cooled fast reactors being developed now.
K. L. Thomsen
Nuclear Science and Engineering | Volume 119 | Number 3 | March 1995 | Pages 167-174
Technical Paper | doi.org/10.13182/NSE95-A24082
Articles are hosted by Taylor and Francis Online.
The coupled collision probability and interface-current equations in the flat-flux, isotropic approximation are implemented in a light water reactor (LWR) lattice code that is under development. By using traditional Gaussian elimination of the subregion fluxes of the cells, the interface-current equations are turned into a nodal form. In the transformed flux and current equations, expressed in terms of response matrix theory, the coefficients become multiple-flight probabilities, which obey analogous conservation and reciprocity relations as the first-flight probabilities. The convergence of the iterative solution for the interface currents is accelerated by successive overrelaxation (SOR) and global rebalancing techniques. The improvement of the convergence rate is investigated in a series of test calculations. The optimal strategy is found to be alternation between one SOR iteration and three to four free iterations while the rebalancing should be limited to two initial iterations in normal LWR cases.