Atomic Energy Society of Japan

For the safe and steady decommissioning of an accident-damaged reactor, it is essential to establish an appropriate long-term maintenance plan for the reactor building. To realize this, we have been studying an actual measurement or estimation of the environment, degradation growth possibility, inspection intervals, and prediction of the reactor building conditions just after the accident and in the future. We reported an orientation of such estimation or prediction methods in the previous report.As the follow-up, we report the results of taking the shape of an actual measurement and estimation method of the environment around the reactor building and considering an approach to predicting degradation growth of accident-damaged reactor building in an engineering manner and a framework of promising mathematical methods.