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Development of U-Bending Technology for Alloy 690 Tubes

[+] Author Affiliations
Tae-Wan Ku, Jin-Hyun Cha

Pusan National University, Busan, South Korea

Woo-Sung Jin, Won-Seok Kim

BHI Co., Ltd., Gyeongnam, South Korea

Paper No. ICONE20-POWER2012-54599, pp. 629-637; 9 pages
doi:10.1115/ICONE20-POWER2012-54599
From:
  • 2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference
  • Volume 1: Plant Operations, Maintenance, Engineering, Modifications, Life Cycle, and Balance of Plant; Component Reliability and Materials Issues; Steam Generator Technology Applications and Innovations; Advanced Reactors and Near-Term Deployment; Reactor Physics, Neutronics, and Transport Theory; Nuclear Education, Human Resources, and Public Acceptance
  • Anaheim, California, USA, July 30–August 3, 2012
  • Conference Sponsors: Nuclear Engineering Division, Power Division
  • ISBN: 978-0-7918-4495-3
  • Copyright © 2012 by ASME

abstract

Steam generator installed with heat-transfer tubes (HTT) is an enormous heat exchanger that uses heat energy derived from a reactor to generate steam. The steam drains into turbine generator of an nuclear power plant, and plays an important role in producing electric power in nuclear power plant. Lately, demand of advanced manufacturing technology, especially related with high quality heat transfer tubes used for the steam generator of APR1400, has been increased. And the quality of final product as the heat transfer tube, which is manufactured by using Alloy 690, depends upon several process variables such as angular speed, bending angle and bending radius, and so on. For satisfying the required quality of the heat transfer tube, several factors such as permissible ovality, minimum wall thickness, tolerance of bending radius, residual stress have to be secured. In this study, numerical and experimental approaches on the U-bending process to manufacture the heat transfer tube from the straight and long tube are performed with considering the elastic recovery of the deformed tube after the U-bending. Furthermore the ovality, the minimum wall thickness and the tolerance of the U-bending tube are predicted and measured. From the results, it is shown that main process variable, which plays an important role to the formability such as the ovality and the minimum wall thickness of the heat transfer tube used for the steam generator, is the angular speed.

Copyright © 2012 by ASME
Topics: Alloys

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