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Report No.

Measurement and analysis of in-vessel component activation and $$gamma$$ dose rate distribution in Joyo

Maeda, Shigetaka   ; Naito, Hiroyuki; Ito, Chikara   ; Aoyama, Takafumi 

In-vessel $$gamma$$ rate measurements have been conducted in the experimental fast reactor Joyo to obtain experimental data and to verify the analysis method. The in-vessel $$gamma$$ dose with cooling times of 500 and 700 days after reactor shutdown was measured in Joyo which had been operated for approximately 30 years. The $$gamma$$ dose was calculated using QAD code with the $$gamma$$ source obtained by ORIGEN2 code. The ratios between the calculated and experimental value was ranged 1.3 and 2.7. The accuracy of analys method for the amount and distribution of radioactive products and $$gamma$$ ray dose inside reactor vessel was confirmed for the in-vessel inspection or repair.



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