| Project/Area Number |
06558071
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
エネルギー学一般・原子力学
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
SUGISAKI Masayasu Kyushu Univ., Fac.Eng., Professor, 工学部, 教授 (10037905)
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| Co-Investigator(Kenkyū-buntansha) |
HATANO Yuji Kyushu Univ., Fac.Eng., Research Assistant, 工学部, 助手 (80218487)
HASHIZUME Kenichi Kyushu Univ., Fac.Eng., Assistant Professor, 工学部, 助教授 (70243912)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 1995: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1994: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | Spent Fuel / Dry Storage / Zircaloy / Hydride / Charpy Test |
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| Research Abstract |
The toughness of Ziraloy-2 specimens (size : 5mm x 10mm x 50mm) containing 100 ppm or 400 ppm hydrogen was measured with the Charpy test in a temperature region from room temperature to 250ﾟC.The hydrogen concentration in the specimens was gradient in one dimension, which was prepared with the thermomigration of hydrogen. The measurement suggested that the toughness of the specimen, in which the hydride is nonuniformly distributed, was larger than that of the specimen in which the hydride was uniformly distributed. The redistribution phenomena of hydride in the Zircaloy cladding of the fuel for the light water cooled reactors under the conditions of the dry storage was analyzed from the thermodynamical aspect and the rate of redistribution of the hydride was calculated with the computer simulation, in which the burn-up of the fuel was assumed as 40-55Gwd/t and the amount of hydrogen absorbed in the cladding was also assumed as 300-400ppm. In the calculation, the temperature conditions of the dry storage was assumed as 150-450ﾟC.Followings were concluded : (1) The nonuniform distribution of the hydride in the radial direction of the Zircaloy claddings, which was brought about in the reactors, would not be relaxd under the designed temperature conditions of the dry storage. (2) In the case of the dry storage of the spent fuel with the Zircaloy cladding containing 400 ppm hydrogen, the nonuniform distribution of the hydride in the Zircaloy cladding would be collapsed and uniform distribution of the hydride would be built up in an hour provided that the temperature of the Zircaloy cladding would be increased over 480ﾟC because of certain accidents. This redistribution of the hydride would bring about the marked decrease of the toughness of the Zircaloy cladding. These results were presented in the meeting of International Atomic Energy Agency and in the Fall Meeting of Nihon Genshiryoku Gakkai.
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