In the field of nondestructive inspection by eddy current testing, various approaches to the depth-sizing of SCCs by numerical inversion analysis have been taken so far. However, its accuracy is not so high and limited to a certain extent because of no information about the real value of inner conductivity of SCCs. Therefore, we first investigated experimentally the inner conductivity distribution of several artificial SCCs by a precise mechanical processing and 4 terminal resistance measurement. From ...
英字タイトル:
Improvement of a SCC depth-sizing technique using ECT analysis with detailed investigation of SCC conductivity distribution

It is necessary to confirm whether the feed water nozzle inside corner has crack by eddy current testing, to enable long-term operation of a plant. Therefore, we performed eddy current testing using various types of specimen to collect basic data (probability and length measurement accuracy) of the eddy current testing methods, complying with JEAG4217. As a result, eddy current testing was effective for the inspection of feed water nozzle inside corner. ...
英字タイトル:
Eddy current testing technique for feed water nozzle inside corner of nuclear reactor pressure vessel

The basic function of ensuring the safety of nuclear power plants is to shut down the nuclear reactor, cool down the fuel and confine the radioactive substance. In the accident at Fukushima Daiichi nuclear power plant that occurred in March 2011, we succeeded in shut down the nuclear reactor, but it was impossible to cool down the fuel by tsunami inundation, eventually lost the function of confine the radioactive material. Tomari nuclear power plant is promoting multiple and diverse safety measures base...
英字タイトル:
Safety measures of the Tomari nuclear power plant