[en] The authors have developed the location system using a local area network, in order to ensure user's safety during emergency in a long tunnel, such as ILC facility. This system has been applied the medical facilities (iNMRC) used for radiation therapy and a long tunnel for soil transport by the belt conveyor system as experimental trials until last year. On the other hand, it is necessary to verify the influence on the communication accuracy due to wave noise and on the durability of the equipment (AP) according to the radiation, during accelerator operation, in order to introduce this system on ILC. In this research, we investigate the influence on the durability, and the communication performance of the system, in high radiation environments in MR tunnel J-PARC. (author)