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Report No.

Evaluation of feedback reactivity in Monju start-up test

Kitano, Akihiro ; Miyagawa, Takayuki*; Okawachi, Yasushi ; Hazama, Taira 

The feedback reactivity was measured in Monju start-up test conducted in 2010. The two reactivity components related either to power or to the core inlet coolant temperature were evaluated by fitting to a reactivity balance equation as a function of neutron count rate and coolant temperature. The measured feedback reactivity and the two components were compared with calculation taking account of the temperature distribution in the core. The calculated and the measured values of the feedback reactivity showed a reasonable agreement.



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