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Oba, Toshihiro; Suetsugu, Hidehiko*; Yano, Masaya*; Kato, Chiaki; Yanagihara, Takao
JAERI-Tech 2002-082, 47 Pages, 2003/01
JAERI-Tech-2002-082.pdf:1.87MB
The demonstration test for evaluating reliability of the acid recovery evaporator at Rokkasho Reprocessing Plant has been carried out at JAERI. For the nondestructive measurement of the thickness of heat transfer tubes of the acid recovery evaporator in corrosion test, we have developed thickness measurement apparatus for heat transfer tubes by ultrasonic immersion method with high resolution. The ultrasonic prove in a heat transfer tube can be moved vertically and radially. The results obtained by this apparatus coincident well with those obtained by a destructive method using an optical microscope.
Motooka, Takafumi; Numata, Masami; Kiuchi, Kiyoshi
JAERI-Tech 2001-088, 38 Pages, 2002/01
JAERI-Tech-2001-088.pdf:2.78MB
We have been evaluated the safety for corrosion of various metals applied to acid recovery evaporators by the mock-up tests using small scaled equipment and the reference tests in laboratories with small specimens. These tests have been conducted under un-radioactive environment. The environment in practical reprocessing plants has many radioactive species. Therefore, the effect of irradiation on corrosion should be evaluated in detail.In this study, we have developed the corrosion testing equipment, which is employed to simulate environments in the acid recovery evaporators. This report describes the specification of corrosion testing equipment and the results of primary, reference and hot tests.Using the equipment, the corrosion test under heat transfer and irradiation conditions has been carried out for 930 hours in safety. It is expectable that useful corrosion test data in radioactive environment are accumulated with this equipment in future, and help the adequate choice of corrosion test condition in laboratories.
Hamada, Shozo; Fukaya, Kiyoshi*; Kato, Chiaki; Yanagihara, Takao; Doi, Masamitsu*; Kiuchi, Kiyoshi
JAERI-Tech 2001-063, 49 Pages, 2001/10
JAERI-Tech-2001-063.pdf:13.39MB
The demonstration test for the acid recovery evaporator and the dissolver used in the major equipment of Rokkasho Reprocessing Plant (RRP), has been carried out. The mock-up miniature equipment has been employed to it. This test had been performed from April in 1998. The total time of demonstration test using the mock-up equipment is about two and half years, which corresponds to about 20,000 hours. After that, four of the seven heat transfer tubes used in the evaporator were drawn out and the corrosion level and the mechanical properties were evaluated for one of them. As a result, intergranular corrosion was recognized in the inner surface of the heat transfer tube and the corrosion depth at the grain boundary was statistically shown to be about one grain from the inner surface. Further, no change in mechanical properties was observed and growth of intergranular cracks in the inner surface of the specimen was found after flattering test.
*; Ikawa, Koji
Transactions of the American Nuclear Society, 72(SUPPL.1), p.6 - 7, 1995/00
no abstracts in English
*; Ikawa, Koji
Dai-15-Kai Kaku Busshitsu Kanri Gakkai Nihon Shibu Nenji Taikai Rombunshu, 0, p.138 - 144, 1994/10
no abstracts in English
Nomura, Yasushi; R.Leicht*; P.Ashton*
Journal of Nuclear Science and Technology, 31(8), p.850 - 860, 1994/08
Times Cited Count：4 Percentile：53.92(Nuclear Science & Technology)no abstracts in English
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JAERI-M 9910, 37 Pages, 1982/01
no abstracts in English
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Nuclear Science and Engineering, 80(1), p.14 - 25, 1982/00
Times Cited Count：7 Percentile：62.17(Nuclear Science & Technology)no abstracts in English
; ;
Annals of Nuclear Energy, 8(8), p.363 - 369, 1981/00
Times Cited Count：0 Percentile：0.02(Nuclear Science & Technology)no abstracts in English
Kyoto Daigaku Genshiro Jikkenjo Hoshasei Haikibutsu Kanri Semmon Kenkyukai Hokokusho, p.20 - 25, 1981/00
no abstracts in English
