The COMET experiment seeks the direct muon-to-electron conversion as part of the study of Charged Leptons Flavor Violation processes. A highly efficient cosmic muon detection system is needed, with up to 99.99\% efficiency, to achieve a single-event sensitivity below 10-17. The Cosmic Ray Veto (CRV) should first detect the cosmic muon with required efficiency and then it should be rejected through online/offline data processing. CRV consists of two main parts: scintillator strip based (SCRV) and gaseous detectors (by default, Resistive Plate Chambers). Scintillator strips will be placed on top and side COMET installation to cover other detectors, while gaseous detectors will be placed in upstream and downstream area where the radiation background too high. This presentation describes the way to achieve such high efficiency for SCRV system and how to establish the modules mass production and quality tests on each steps of production. Over 18 of such modules of different length (from 3.5 to 4.5 meters) and 0.8-meter width made as a 4-layer sandwich of scintillation counters and aluminum sheets with up to 64 strips on each layer should be produced by Fall of 2026. We provided research anddevelopment of the SCRV system including the optimal scintillator strip geometry searches, optimal CRV module geometry seeking, CRV module assembly technology, etc. The first 3.2-m-loong SCRV module was already produced, passed required quality tests, delivered to J-Parc (Japan) and this module efficiency study is undergoing.
