Review structural analyses of Olkiluoto3 EPR plant turbine and cooling water pump buildings for serviceability limit states

This paper describes the review structural analysis for the Turbine Building of Olkiluoto 3 NPP (UMA) under finished condition when building is covered with insulated cladding and inside temperatures are maintained by HVAC system. The main aim of the review structural analysis is to ensure the sufficient strength and deformation characteristics of the turbine building structures. The second part of this paper describes the verification structural analysis for the Cooling Water Pump Building of Olkiluoto 3 NPP (UQA). The current verification analysis assesses the validity of the Cooling Water Pump building design for serviceability limit states concentrating on crack width calculations. The introduction of construction time shrinkage joints in the turbine building deletes to the large extent the uneven shrinkage contraction in the concrete substructure. It also enables the uniform temperature expansion of the turbine building structures. The required rebar areas in the cooling water pump building were determined for long term serviceability limit states and for allowable crack widths of 0.13 mm as well as for short term serviceability limit states and for allowable crack widths of 0.26 mm. From the obtained results it can be concluded that more than 95% from the all shell elements in the model of the cooling water pump building fulfill crack width requirements in both long term and short term load conditions with the system reinforcement of two layers of 20 mm rebars with 100 mm pitch in both directions. (author)