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Inoue, Kazuko*; Horikawa, Takeshi*; *; *; Minakawa, Nobuaki; Tsuchiya, Yoshinori*; Morii, Yukio; *
Japanese Journal of Applied Physics, Part 1, 37(10), p.5680 - 5686, 1998/10
Times Cited Count：2 Percentile：13.52(Physics, Applied)no abstracts in English
Tsukimori, Kazuyuki*
PNC TN9410 89-166, 265 Pages, 1989/12
The R&D on the feasibility of the bellows expansion joint, which is one of the cost reduction measures for large scale FBR plants, was conducted from 1983 to 1987. After-wards the synthetic evaluations and examinations are still continued. This report has been written as the companion report to "Simplified Analysis Methods for Bellows Analyses". Concerning the following five items, the evaluation methods, which have been developed in order to utilize in establishing design rules for bellows, are explained. (1)Column buckling of bellows under internal pressure. (2)Creep buckling of bellows under internal pressure. (3)Evaluation of strain amplification of bellows generated by the irregularity of the dimenssions among convolutions in elastic-plastic region. (4)Elastic follow-up in the piping system with bellows expansion joints. (5)Elastic follow-up among convolutions of bellows.
*; *; Koakutsu, Toru; *; *
PNC TN9410 89-148, 158 Pages, 1989/10
For the purpose of the verification of the evaluation method on the sodium environmental effect on the mechanical properties of the structural materials used for the prototype LMFBR "MONJU" and the rationalization of the evaluation method for large scale LMFBRs, SUS 304 and 316 austenitic stainless steels and 2.25Cr-1Mo steel (NT) were carried out. Test specimens were exposed to a sodium loop for 10,000 hours at 400 
600
C simulating the primary and secondary coolant systems of the prototype LMFBR "MONJU". After the exposure, fatigue tests were performed in sodium environment. Fatigue tests were also performed on the thermal aged material for 10.000 hours in inert gas. The results obtaind were as follows. (1)The difference between the fatigue lives of sodium exposed materials and thermal aged materials was very small for both kinds of steels and these lives were almost the same as these of as - received materials. (2)Caburization was recognized on the surface of SUS 304 and SUS 316 austenitic stainless steels in the cage tested in sodium after sodium exposed. In the case of 2.25Cr-1Mo steel (NT), some decarburization was observed at 500 C. (3)The fatigue lives didnot depend on the exposure history such as sodium exposed materials and thermal aged materials for 10,000 hours. The carburization and decarburization effects were very small on fatigue life. The fatigue lives were affected by the environment in which fatigue tests are conducted.
