Application of ENA Technique for actual plant in abroad was investigated. High-level nuclear wastes at the Hanford Site are stored underground in carbon steel tanks. The installation of a three-channel prototype electrochemical noise monitoring system for pitting, SCC into double-shell tank was completed. And a monitoring system of a biofilm growth under the coolant water was developed with the disk electrode of the pair. But, it can't be applied well with the ocean environment. Application of ENA technique to the plant doesn't proceed even in abroad compared with Japan.
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