Concentration of radio active elements in primary cooling water at reactor operation of JMTR

Terunuma, Naohiro; Nagao, Yoshiharu  ; Yokouchi, Iichiro; Sato, Masashi

Concentrations of radioactive elements in primary cooling water were measured by regular sampling on reactor operation of the JMTR. The JMTR core was converted to low enriched uranium core at the 108th operation cycle, and the refurbishment of the JMTR has been started after the 165th operation cycle. Measured results of concentrations of -ray release elements, radioactive iodine and tritium in primary cooling water were summarized during 108 - 165th operation cycles.