Water chemistry measurement in in-pile loop experiment of the JMTR

Hanawa, Satoshi; Hata, Kuniki; Chimi, Yasuhiro; Nishiyama, Yutaka

no journal, , 

JAEA is being conducted an in-pile water chemistry research program, by using an in-pile loop newly installed in the Japan Materials Testing Reactor (JMTR), in order to obtain irradiation data which can be applied to benchmarking of water radiolysis and ECP calculation codes. In the experiments in the JMTR, new sampling system will be applied to minimize the decomposition of hydrogen peroxide during water sampling. In the experiment, concentration of hydrogen peroxide is detected by luminol chemiluminescence spectroscopy, which can detect quite low concentration of a few ppb of hydrogen peroxide. ECPs are also measured by installing ECP electrodes in the irradiation rigs. Corrosive environment in the irradiation field is evaluated by the combination of on-line ECP measurement, measurement of chemical species and water radiolysis / ECP analyses. The water chemistry measurement system and the capability of the JMTR for water chemistry measurement were reported in the paper.