TY - CHAP
T1 - The coupled code TRAB-3D-SMABRE for 3D transient and accident analyses
AU - Miettinen, Jaakko
AU - Räty, Hanna
PY - 2004
Y1 - 2004
N2 - The three-dimensional TRAB-3D core dynamics code is being
internally coupled to the thermal hydraulics system code
SMABRE. The codes have previously been coupled with a
parallel coupling scheme. VTT's reactor dynamics codes
have performed well in all the situations that they have
originally been designed for. The most important
limitation of the present code models is their inability
to handle coolant flow reversal in the core channel, a
phenomenon that can be encountered in e.g. BWR ATWS cases
or VVER power excursions. The new coupling of the two
codes is realized on the level of each node of each
channel in the core, with each fuel bundle described with
its own channel. Necessary interfaces have been created,
an improved version of SMABRE's thermal hydraulics
solution method developed, and a steady state procedure
developed. A satisfactorily working steady state solution
has been achieved. The next step in the development will
be testing of the transient calculation. Besides solving
the flow reversal limitation of the present dynamics
models, a successful coupling will allow expanding into
more realistic modelling of an open core.
AB - The three-dimensional TRAB-3D core dynamics code is being
internally coupled to the thermal hydraulics system code
SMABRE. The codes have previously been coupled with a
parallel coupling scheme. VTT's reactor dynamics codes
have performed well in all the situations that they have
originally been designed for. The most important
limitation of the present code models is their inability
to handle coolant flow reversal in the core channel, a
phenomenon that can be encountered in e.g. BWR ATWS cases
or VVER power excursions. The new coupling of the two
codes is realized on the level of each node of each
channel in the core, with each fuel bundle described with
its own channel. Necessary interfaces have been created,
an improved version of SMABRE's thermal hydraulics
solution method developed, and a steady state procedure
developed. A satisfactorily working steady state solution
has been achieved. The next step in the development will
be testing of the transient calculation. Besides solving
the flow reversal limitation of the present dynamics
models, a successful coupling will allow expanding into
more realistic modelling of an open core.
M3 - Chapter or book article
SN - 951-38-6515-0
T3 - VTT Tiedotteita - Research Notes
SP - 38
EP - 45
BT - SAFIR, The Finnish Research Programme on Nuclear Power Plant Safety 2003 - 2006
PB - VTT Technical Research Centre of Finland
CY - Espoo
ER -