2021 Volume 70 Issue 12 Pages 409-415
In order to evaluate structural integrity of RPV and PCV after severe accident in Fukushima Daiichi nuclear power station, immersion corrosion tests were performed using diluted artificial sea water simulating PCV stagnant water. Based on the result of parabolic law approximation for corrosion test data and others, corrosion loss of RPV and PCV was predicted in 40 years after the severe accident considering the time of fuel debris removal. Evaluation of structural integrity of RPV and PCV main equipment was performed using such as the predicted corrosion loss and load condition based on earthquake response analysis results. It was confirmed that generated stresses for RPV and PCV main equipment of unit 1, 2 and 3 satisfied with allowable values in 40 years after the severe accident.
