Features of Design and Results of Function Tests at Tomari Unit 3

Tomari Unit 3 is not APWR but many advanced and latest technologies such as integrated I&C system including advanced main control board, advanced steam turbine and zinc injection are introduced into it. These three technologies are the fist application in Japan or in the world. Advanced main control board consists of large display panel, operator console and shift supervisor console and improved alarm system is introduced into it. Operator’s mental workload and human error probability is each improved 27% and 59% by introducing advanced main control board. Also maintainability and construction cost is improved by introducing integrated I&C system. MTTR is less than 30 minutes. 54-inch last blade in LP turbine, 3-dimensional hydraulic design blade, integral shroud blade and advanced bearing are applied to advanced steam turbine. Improvement of turbine efficiency by introducing 54-inch and 3-dimensional hydraulic design blade is evaluated to be approximately 0.3%. Vibration amplitude of bearings in turbine-generator during HFT was very small due to advanced bearing. Zinc injection was started from HFT for the first time in the world. Measured zinc consumption is consistent with anticipated. According to result of Zn injection during HFT, radiation sources are approximately 10–20% reduced in comparison with no injection.Copyright © 2009 by ASME