Mud Vacuum System for Decontamination of Radioactive Substances Deposited on Bottom of Reservoir Pond: -Analysis of Winding Position based on Possibility Determination of Positioning Vacuum Head Controlled by Multi-Wire Suspension-@@@―複数ワイヤ懸架による吸引ヘッドの位置決め可否判定に基づいたワイヤ固定位置の解析―