Dimensionally adaptive dynamic switching and adjoint sensitivity analysis:new features of the RELAP5/PANBOX/COBRA code system for reactor safety transients
Dg. Cacuci, Dimensionally adaptive dynamic switching and adjoint sensitivity analysis:new features of the RELAP5/PANBOX/COBRA code system for reactor safety transients, NUCL ENG DE, 202(2-3), 2000, pp. 325-338
This paper highlights two novel features that have been implemented into th
e coupled RELAPS/PANBOX2/COBRA3 (R/P/C) code system. On the one hand, the R
/P/C code system has been extended to include a dimensionally adaptive algo
rithm that uses the underlying physical phenomena to switch dynamically bet
ween three-dimensional (3D), one-dimensional (1D), and point-kinetics model
s, thereby reducing computational times up to a factor of five while preser
ving the accuracy, within user-defined error criteria, of the 3D reference
calculation. On the other hand, the R/P/C system has also been extended to
include the Adjoint Sensitivity Analysis Procedure (ASAP) for the RELAPS/MO
D3.2 two-fluid model with non-condensables, thus enabling the efficient cal
culation of local sensitivities of RELAP5 results to various parameters in
the RELAP5 code. (C) 2000 Elsevier Science B.V. All rights reserved.