  The Neutrinos Angra Experiment, a water-based Cherenkov detector, is located
at the Angra dos Reis nuclear power plant in Brazil. Designed to detect
electron antineutrinos produced in the nuclear reactor, the primary objective
of the experiment is to demonstrate the feasibility of monitoring reactor
activity using an antineutrino detector. This effort aligns with the
International Atomic Energy Agency (IAEA) program to identify potential and
novel technologies applicable to nonproliferation safeguards. Operating on the
surface presents challenges such as high noise rates, necessitating the
development of very sensitive, yet small-scale detectors. These conditions make
the Angra experiment an excellent platform for both developing the application
and gaining expertise in new technologies and analysis methods. The detector
employs a water-based target doped with gadolinium to enhance its sensitivity
to antineutrinos. In this work, we describe the main features of the detector
and the electronics chain, including front-end and data acquisition components.
We detail the data acquisition strategies and the methodologies applied for
signal processing and event selection. Preliminary physics results suggest that
the detector can reliably monitor reactor operations by detecting the inverse
beta decay induced by electron antineutrinos from the reactor.
