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Nuclear Power Deployment Operation and Sustainability Part 7

Tham khảo tài liệu 'nuclear power deployment operation and sustainability part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 200 Nuclear Power - Deployment Operation and Sustainability middle and south basins has also been deactivated with a modified underwater approach discussed later in this report. The TAN-607 SFP was viewed as a significant but manageable challenge with application to future larger projects. The TAN-607 SFP had been used for storage of a number of different nuclear fuels the most notable being the damaged Three Mile Island fuel and core debris which consequently led to increased contamination levels in the pool. The radiological contamination and exposure controls were managed on a real-time basis. While each section of the SFP had been extensively surveyed using remotely-reporting submersible extended-reach AMP-100 radiation probes manufactured by Arrow-Tech Inc. each shift of divers also visually surveyed their work area prior to beginning work. Each diver was outfitted with five redundant remotely-reporting dosimeters multiplexed to the DMC 2000S manufactured by Merlin Gerin Co. These instruments were integrated into the dive station laptop computer that monitored divers dive times. If two of the dosimeter units failed or if dose readings exceeded the 500 mR hr alarm set point the diver was required to move to a lower dose area. Industrial guidelines of three-hour dives were maintained work below 12.2 m could not exceed 1.5 hours. A team of assistants dressed in anti-contamination clothing and a partially-suited substitute diver were maintained at the entrance to the dive at all times. The divers averaged 5-8 mR radiation dose per dive and completed 255 dives prior to the only incidence of skin contamination out of a total of 411 dives for 1673 dive hours on all four basins . In preparation for the dives foreign objects and as much of the sludge as possible were removed from the pool. This action along with the shielding properties of the water and the heavy rubber dive suit resulted in lower radiation doses. Debris removal was first attempted using long-reach .