Analysis and Evaluation of the Air Velocity by Statistics Processing Method at the Tono Mine.

Sakai, Tetsuo*; Okuzono, Akihiko*; Kashiwase, Yoichi*

At the Tono mine, which belongs to Japan Nuclear Cycle Development Institute (herein after JNC), five thermistor anemometers have been installed separately at the main airway and air velocity is being monitored at the surface continuously to check the underground condition. However, since each thermistor anemometer can measure a point velocity in the cross section, so it is difficult to grasp the correct average air velocity. Therefore, based on the measurement result of the air velocity at the 38 points arranged on the same section at Hon-Nobe Kodo, 160m from the pit bottom, those data were analyzed by statistics processing method and a positional coefficient of proofreading was calculated in order to find out average air velocity by the measured velocity of the installed anemometer. Semicylindrical shape sectional view of the air velocity with considerable velocity even near the wall was obtained by the statistics processing method. According to the analysis result, 1.03m/sec average air velocity was obtained compared to 1.20m/sec measured value and also 0.86 was calculated as a possitional coefficient of proofreading. By the result, it makes possible to find out average air velocity by the menitored value in the cross section of the airway. As a future subject, grasping correct ventilation balance of the whole mine and total evaluation of the ventilation will be required by perfoming air velocity measurement and calculate the positional coefficient of proofreading using same methodology at other anemometer installed position.