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SMART (System-integrated
Modular Advanced Reactor), which is conceptually developed by KAERI (Korea
Atomic Energy Research Institute), is a small-sized advanced integral PWR that
produces 330 MW of thermal energy under full power operating conditions. SMART
is a multi-purpose SMR that furthermore than electricity production can be used
for different applications including: process heat for industries and small
isolated grids, district heating and sea water desalination. This SMR has been
designed with enough output to meet the fresh water and electricity demands of a city with one
hundred thousand populations. As
shown in Fig. 1 major components, including
reactor coolant pumps, steam generators and a self-pressurizer are integrated
within a single pressure vessel, in which the arrangement of components differs
from the conventional loop-type reactors (IAEA,
2011; Lee, 2010).

SMART core overall design
data are presented in Table 1. Cross view of
SMART reactor core configuration is presented in Fig.
2 and also Table 2 describes the
different core configuration quantities. The reactor core has 57 square lattice
fuel assemblies with 2 m active height. Each fuel assembly contains 265 fuel
rods (some fuel rods contains a mixture of UO2+Gd2O3
that known as IFBA (Integral Fuel Burnable absorber)), 24 guide tube and a
central instrumentation channel. Core reactivity in SMART reactor is controlled
only by IFBA rods and soluble poison while most other typical PWRs use fixed
burnable absorber rods (SMART Report, 2012; SMART
SSAR, 2010).

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In
the SMART core design, IFBA rods are present in all of the fuel assemblies with
different arrangements (Fig. 3). All IFBA
rods have same 8 weight percent of Gd2O3 to reduce the
large initial Keff value and also flatten the power distribution
during the core cycle. The SMART core fuel assemblies are categorized to A and
B according to the presence of Gd2O3 at the top and bottom of the IFBA rods (Fig. 4). The fuel assemblies placed near the
center of core have 2.82% U-235 and other fuel assemblies have 4.88% U-235 fuel
enrichment but the IFBA rods are exception. The IFBA rods have 1.6 w/o U-235 at
a part of top and bottom of the rod and 1.8 w/o U-235 at other parts (SMART Report, 2012; SMART SSAR, 2010).

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