[en] A methodology has been suggestd to develop a module, which is able to estimate the steam explosion load under the integral code structure. As the first step of module development, TEXAS-V, which is a one-dimensional mechanistic code for steam explosion analysis, was selected and sample calculations were done. At this stage, the characteristics of the TEXAS-V code was identified and the analysis capability was setup. A sensitivity study was also performed on the uncertain code parameters such as mesh number, mesh cross-sectional area, mixing completion condition, and triggering magnitude. The melt jet with the diameter of 0.15m and the velocity of 9m/s was poured into the water at 1 atm, 363K, and 1.1 m depth during 0.74 sec. 197kg of melt was mixed with the water among the total of 947kg. The explosion peak pressure, propagation speed, and conversion ratio considering the mixed melt, were evaluated as 40MPa, 1500m/s, and 2%, respectively. The triggering magnitude did not show any effect on the explosion strength once the explosion would be started. The explosion violence was sensitive to the mesh number, mesh area, and mixing completion condition, mainly because the mixture condition is dependent upon these parameters. The additional study on these parameters needs to be done