| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
The present study examined (1) reduction in the amount of harmful radioactive impurities generating long half-life nuclides, (2) minimization of the concentration of the alloying element Ti, which is also one of the harmful radioactive elements, and (3) removal of noble gaseous and volatile gaseous radioactive impurities. For the topic (1), harmful radioactive impurities, Co and Mo, were successfully reduced by 50 % and 90 %, respectively, compared with the current alloys. For (2), it was revealed that the alloys maintained ductility even if Ti concentration was reduced in to 1 mass% from the current amount, 4 mass%. For (3), it was demonstrated that the concentration of the impurities, Co, Ni, Cu, Al and Mn, could be reduced by refining with electron beam melting. Ar concentration was below the detection limit, 10 mass ppm, irrespective of the refining, indicating Ar must be effectively removed by melting.
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