[en] The reference guide for HYBER (Hydrogen Burn-Equipment Response), the Hydrogen Burn Survival algorithm, is provided in this report. HYBER is comprised of two self-contained computer programs, DATGEN and SOLVER, developed on VAX11/780 and CRAY-1 computer systems for use on IBM Personal Computers. These computer codes model single or multiple hydrogen-carbon monoxide-air combustion processes in single-volume vessels, providing predictions for the environment gas state and composition. HYBER was developed to model combustion processes in nuclear reactor containments and to estimate the thermal response of safety-related equipment subject to the combustion and post-combustion environments. This references guide discusses the combustion, heat, and mass transfer models included in the algorithm computer codes. The assumptions used in the codes and the execution procedure (i.e., computational framework) in SOLVER are provided. HYBER simulations of two experiments are compared with the data for two different vessels (5.6 m³ and 2084. m³ total volume, respectively). These comparisons demonstrate the capabilities of modeling combustion processes with HYBER