Background: Modularization is one of the main characteristics for AP1000 nuclear power plant building.The steel-concrete-steel module wall is used instead of reinforced concrete structure wall.Usually

lots of Overlay Plate Embedments will be installed on the module wall to connect and fasten other structures

such as pipes

equipments and operation platforms.As for many supports taking less design loads

the safety margin is too big when using OLP embedment.Purpose: An improvement design will make sense that the supports with less deisn loads can be welded directly to the module wall instead of embedments.Methods: A finite element analysis based on nuclear-related concrete code is carried out.Results: Through analysis

the equations for the allowable design loads of supports to be welded directly to module wall are provided in this paper.Conclusions: The improvement design is proved feasible.In this way

the strength for steel face plate and studs will be utilized fully and this method will facilitate and simplify the design and construction with considerable engineering application value.