Analysis of deformation of monitoring water tank in a nuclear power plant

Three 1000m
³
monitoring water tanks are installed in the non-radioactive production waste water plant of a coastal nuclear power plant. During the commissioning period in 2015, the overflow of the top snorkel of the water tank MT105C was monitored. A partial warping occurred at the bottom of the water tank on the outlet side, and the water tank was separated from the foundation by about 30mm. The water tank was inclined toward the water inlet side, and the pipe and pipe supports were deformed and displaced. Through the collection of monitoring data and the establishment of a three-dimensional finite element model of the monitoring water tank, the deformation of the tank is mainly due to the over-designed water level in the tank and overflowing the roof, resulting in the dynamic water pressure of the water head of nearly 12m. Therefore, in order to ensure the safe operation of the receiving and monitoring water tank, it should be operated according to the design working conditions. The deformation monitoring water tank MT105C is comprehensively inspected to eliminate hidden defects, and the reinforcement and reinforcement of the deformation area of the bottom plate and the foundation are directly strengthened, and the buffering measures for avoiding accident overpressure are added. After the reinforcement and repair, the water tank MT105C has not found any deformation problems.