Special attention deserves the provision of reinforcement to prevent cracking problems associated with the phenomena of shrinkage and temperature associated with the generation of cement hydration heat during concrete setting, which can induce significant deformations and stresses due to the volume change associated with the concrete mass temperature increase. The cylindrical shaft in power plant is a massive underground structure and of great importance to the security during construction. In this paper, the minimum reinforcement as initial design is adopted, then checks are performed for verifying operational and seismic conditions. Using uniform distribution of vertical reinforcement, the initial distribution of the longitudinal reinforcement of the LSS cylindrical shaft was calculated to verify its stability. This paper mainly presents the results of structure calculation based on an update of the geotechnical parameters resulting from the LSS monitoring layout and load combinations, with special attention to the seismic response and its interaction with the surrounding rock and the amplifying effects on the Control Room.