  Globular Clusters are among the oldest objects in the Galaxy, thus their
researchers are key to understanding the processes of evolution and formation
that the galaxy has experienced in early stages. Spectroscopic studies allow us
to carry out detailed analyzes on the chemical composition of Globular
Clusters. The aim of our research is to perform a detailed analysis of chemical
abundances to a sample of stars of the Bulge Globular Cluster NGC 6553, in
order to determine chemical patterns that allow us to appreciate the phenomenon
of Multiple Population in one of the most metal-rich Globular Clusters in the
Galaxy. This analysis is being carried out with data obtained by FLAMES/GIRAFFE
spectrograph, VVV Survey and DR2 of Gaia Mission. We analyzed 20 Red Horizontal
Branch Stars, being the first extensive spectroscopic abundance analysis for
this cluster and measured 8 chemical elements (O, Na, Mg, Si, Ca, Ti, Cr and
Ni), deriving a mean iron content of $[Fe/H] = -0.10\pm0.01$ and a mean of
$[\alpha/Fe] = 0.21\pm0.02$, considering Mg, Si, Ca and Ti (errors on the
mean). We found a significant spread in the content of Na but a small or
negligible in O. We did not find an intrinsic variation in the content of
$\alpha$ and iron-peak elements, showing a good agreement with the trend of the
Bulge field stars, suggesting a similar origin and evolution.
