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東濃鉱山における風速測定結果の統計解析及び評価 報告書

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

坂井 哲郎*; 奥園 昭彦*; 柏瀬 陽一*

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

核燃料サイクル開発機構(以降、「サイクル機構」と称する)の保有する東濃鉱山においては、通気管理を行うために坑内の主要坑道5箇所にサーミスタ風速計を設置して連続観測を行っている。現状では、各風速計は坑道断面の一点を測定しているため、正確な坑内通気の把握をすることはできない。このため、本延坑道160mにおいて同一断面上に配置した38測点での風速測定結果に基づき、統計処理により風速の分布を解析し、既設風速計の測定値から平均風速を求めるための位置校正係数を求めることとした。統計処理により求めた風速分布は、孔壁付近でもある程度の風速を持つカマボコ型の風速分布が得られた。解析結果からは、本延坑道160mの既設風速計の測定値1.20m/secに対し、平均風速は1.03m/secとなり、位置校正係数は0.86との結果を得た。このことにより、坑道断面上の1点における測定値をもって、坑道断面の平均風速を得ることが可能となった。今後の課題としては、今回の測定箇所以外の風速計設置箇所で同様の測定を行い、その各箇所における位置校正係数を求めることにより、坑内全域での正確な坑内通気の把握と総合的な評価が必要となる。

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.

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