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Nuclear Power Control, Reliability and Human Factors Part 6

Tham khảo tài liệu 'nuclear power control, reliability and human factors part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Radiation-Hard and Intelligent Optical Fiber Sensors for Nuclear Power Plants 139 by the authorities must be met to guarantee an adequate protection of the public. Waste management starts with the registration of the radioactive waste arising at different locations from different applications in industry research as well as at nuclear fuel cycle facilities. The waste is then stored conditioned into an appropriate form for further handling and disposal intermediately stored whenever necessary over long periods of time and eventually disposed of Jobmann M. Biurrun E. 2003 . Long-term effectiveness low maintenance reliable functioning with high accuracy and resistance to various mechanical and geochemical impacts are major attributes of monitoring systems devised to be operated at least during the operational phase of a repository. In addition low maintenance and automatic data acquisition without disturbing the normal operation will help reducing operational costs. Due to these reasons Russian Krasnoyarsk SNF repository started using of reliable and radiation-hard fiber optic technology as the basis for global monitoring systems at final disposal sites. Series of parameters important to safety of SNF repository can be monitored by optical sensors. Sensing elements to measure strain displacement temperature and water occurrence together with the multiplexing and data acquisition systems were installed at 1000m depth and the operation temperature is about 40 C . The configuration of experimental OFS system is shown on fig. 22. Fig. 22. Configuration of the OFS system in SNF repository In three boreholes strain temperature and water detection sensors are installed whereas the displacement sensors are fastened around the cross-section of the drift to monitor changes of the cavity geometry. 140 Nuclear Power - Control Reliability and Human Factors The complete circuit diagram of the OFS system is shown on fig. 23. Fig. 23. Circuit diagram of the OFS system in SNF .