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CYNOD: A Neutronics Code for Pebble Bed Modular Reactor Coupled Transient Analysis

[+] Author Affiliations
Hikaru Hiruta, Abderrafi M. Ougouag, Hans D. Gougar, Javier Ortensi, David W. Nigg, Cliff B. Davis, Walter L. Weaver, III

Idaho National Laboratory, Idaho Falls, ID

Paper No. HTR2008-58255, pp. 561-566; 6 pages
doi:10.1115/HTR2008-58255
From:
  • Fourth International Topical Meeting on High Temperature Reactor Technology
  • Fourth International Topical Meeting on High Temperature Reactor Technology, Volume 1
  • Washington, DC, USA, September 28–October 1, 2008
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4854-8 | eISBN: 978-0-7918-3834-1
  • Copyright © 2008 by ASME

abstract

In this paper, a new neutron kinetics solver for cylindrical R-Z geometry, CYNOD, is presented for the simulation of coupled transient problems for pebble bed reactors. The code utilizes the Direct Coarse Mesh Finite Difference method, in which a set of one-dimensional equations in each transverse direction is solved by means of the analytic Green’s function method. A method that deals with control rod cusping problems is also presented. A heterogeneous fuel kernel model is implemented in order to accurately take into account Doppler feedback effects. Numerical results that demonstrate the accuracy of the code are also presented.

Copyright © 2008 by ASME

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