Analytical study for the in-vessel acoustic detection test investigation of modeling of fuel-pins and positioning of soundsource

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Feasibility of a in-vessel acoustic detection system, which is used to detect boiling noise of sodium in a reactor vessel of FBR, was evaluated by means of SOSUM (Sound source Super-imposed Method) code. In 1997 Fy propagation of abnormal sound (ex, boiling noise) was evaluated. In 1998 Fy, detail simulation model in which fuel pins with wire are involved, was evaluated. In order to reduce calculation time, dipole model was adopted in the simulation. Adequacy of the dipole simulation model was confirmed by comparison with the simulated result acquired by normal elements division model. With the result of this study, difference of propagation was less than about 6 %,. and detecting sound source's position in reactor vessel was evaluated to be possible by Synthetic Aperture Focusing Technique with about 4 detecting points.