High linear power irradiation test with Am-MOX fuels, 3; Irradiation test in Joyo and linear heat rate evaluation

Maeda, Shigetaka   ; Soga, Tomonori ; Itagaki, Wataru  ; Sekine, Takashi ; Aoyama, Takafumi 

High linear power irradiation test and post irradiation experiment is carried out using low-density MOX fuel which contains Am in experimental fast reactor Joyo in order to confirm thermal performance of the fuel for fast reactor which contains minor actinides such as americium. Irradiation test and irradiation condition evaluation are reported. In the irradiation test, Maximum reactor thermal output 124.8MWt was achieved by the rise to power pattern for simulating over power right after the preconditioning. As an irradiation condition evaluation, the analysis simulated in detail to the structure of the fuel pellet using Monte Carlo calculation code MCNP was carried out, and line heat rate of the test fuel pin was obtained. Largest line output of the each element which evaluated the calculated value of MCNP by correcting (about C/E=0.98) at combustion rate measured value by the Nd method of post irradiation experiment, was 463-476W/cm at 124.8MWt.