Abstract <p>The NOvA experiment is designed to study oscillations in an accelerator neutrino beam. Due to the large size and high segmentation of the detectors, as well as a flexible system of program triggers and data acquisition, atmospheric neutrinos can be detected and studied in the NOvA. This paper presents a developed methodology for atmospheric neutrino registration in the far detector: it outlines the procedure for selecting and reconstructing triggers, calculates their efficiency for background and signal events, and finally, provides the expected energy spectrum of atmospheric neutrinos.</p>