NDLI: Structural design approach of steam generator made of modified 9Cr-1Mo for high temperature operation

Content Provider	Springer Nature Link
Author	Srinivasan, R. Chellapandi, P. Jebaraj, C.
Copyright Year	2010
Abstract	Once through shell and tube steam generators made up of modified 9 Cr-1Mo are employed in nuclear and other power plants for producing steam. In Fast Breeder Reactor (FBR), Steam Generator (SG) is a critical component as its availability decides the capacity factor of the plant. In the 500 MWe pool type PFBR, there are 8 steam generators (SGs), 4 in each of the two secondary loops. These steam generators are taken as reference component for this paper. Each SG is a shell and tube, once through vertical heat exchanger. The sodium is on the shell side and the water / steam is on the tube side. The secondary sodium enters at 798 K and leaves at 628 K. The water is enters at the bottom at 508 K and the superheated steam leaves at the top at 766 K. SG is around 25 m tall and supported at the center of the component. The design life is 40 Y for PFBR and will be more for future steam generators.The first step in structural design of the steam generators is to identify the critical locations with respect to high temperature failure modes. In case of PFBR SG, the critical locations are tube to tubesheet joint, tubesheet to shell junction, shell nozzle junction and support junction. The modeling and analysis procedure for these critical parts particularly (i) the treatment of perforated region in the tubesheets, (ii) idealizing of tube to tubesheet welds and (iii) stress analysis of shell -support junction as well as shell nozzle junction, are discussed in the paper. Typical analyses for PFBR with results are presented as illustration. The paper also addresses further areas of interest for future research.
Starting Page	629
Ending Page	634
Page Count	6
File Format	PDF
ISSN	09722815
Journal	Transactions of the Indian Institute of Metals
Volume Number	63
Issue Number	2-3
e-ISSN	09751645
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-11-25
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	modified 9 Cr-1Mo hot support junction tubesheet analysis tube to tubesheet weld Tribology, Corrosion and Coatings Materials Science Metallic Materials
Content Type	Text
Resource Type	Article
Subject	Metals and Alloys

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