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Journal of Failure Analysis and Prevention

, Volume 19, Issue 1, pp 237–244 | Cite as

Failure Analysis of Motorized Bellow-Sealed Valve of Sodium Loop in Fast Breeder Test Reactor

  • V. Thomas PaulEmail author
  • S. Mahadevan
  • S. C. S. P. Kumar Krovvidi
  • Sunil Goyal
  • S. Murugesan
  • R. Thirumurugesan
  • T. Ezhilarasi
  • P. Parameswaran
  • S. Raju
  • S. Saroja
Technical Article---Peer-Reviewed
  • 29 Downloads

Abstract

A motorized bellow-sealed valve in the steam generator leak detection circuit of fast breeder test reactor developed sodium leak while carrying out functional testing after providing temporary power supply to the valve. A systematic analysis of failed bellows along with the stem was carried out to understand the possible cause of the failure. Visual examination indicated that the bellows had suffered extensive twisting before failure. The cause for extensive deformation of the bellows is attributed to the failure of anti-rotation mechanism and high friction between the nut and the screw. This resulted in torsional loading on the bellows. Detailed finite element analysis showed that the bellows were safe during normal operating condition and, however, experienced extensive deformation due to the torsional loading. Systematic microstructural studies using scanning electron microscopy and defect and residual stress analysis using X-ray diffraction (XRD) were carried out. The microstructure of stem and bellows exhibits the presence of extensive slip bands and twins, which indicated that the failure occurred due to extensive plastic deformation. Large variation in hardness and defect density as revealed by XRD analysis from different locations of the failed bellows supports the above observation. The presence of large number of twins in different locations shows that the component has experienced severe stress due to torsional loading.

Keywords

Bellows Failure analysis Torsional loading Finite element analysis SEM XRD 

Notes

Acknowledgments

The authors acknowledge the colleagues from RFG/IGCAR for providing the details regarding the operating history of the bellow-sealed valve and Shri. S. Arun Kumar, NDED/IGCAR, for the XRD measurements.

References

  1. 1.
    K.V.S. Kumar, A. Babu, B. Anandapadmanaban, G. Srinivasan, Twenty five years of operating experience with the Fast Breeder Test Reactor. Energy Proc. 7, 323–332 (2011)CrossRefGoogle Scholar
  2. 2.
    IGC/ROMG/FBTR/S-RS-17/33420/SER-047 Rev-1(04/2015)Google Scholar
  3. 3.
    “Standard test Methods for Determining the Inclusion Content of Steels”, E-45-05, ASTM InternationalGoogle Scholar
  4. 4.
    L. Younsheng, S. Shuiping, Strength analysis and structural optimization of U-shaped bellows. Int. J. Press. Vessel Pip. 42, 33–46 (1990)CrossRefGoogle Scholar
  5. 5.
    X.M. Xiang, G. Lu, Z.X. Li, Y. Lv, Finite element analysis and experimental study on a bellows joint. Eng. Struct. 151, 584–598 (2017)CrossRefGoogle Scholar
  6. 6.
    S.C.S.P. Kumar Krovvidi, G. Padmakumar, A.K. Bhaduri, Design and analysis of bellows for high temperature application as per RCC-MR. Trans. Indian Inst. Met. 69, 531–535 (2016)CrossRefGoogle Scholar
  7. 7.
    M.F. Ashby, A first report on deformation-mechanism maps. Acta Met. 20, 887–897 (1972)CrossRefGoogle Scholar
  8. 8.
    G.E. Dieter, Mechanical Metallurgy, 3rd edn. (McGraw-Hill Book Co., New York, 1986), p. 187Google Scholar
  9. 9.
    Y.B. Wang, X.Z. Liao, Y.H. Zhao, E.J. Lavernia et al., The role of stacking faults and twin boundaries in grain refinement of a Cu–Zn alloy processed by high-pressure torsion. Mater. Sci. Eng. A 527, 4959–4966 (2010)CrossRefGoogle Scholar
  10. 10.
    P.M. Anderson, N.A. Fleck, K.L. Johnson, Localization of plastic deformation in shear due to microcracks. J. Mech. Phys. Solids 38, 681–699 (1990)CrossRefGoogle Scholar
  11. 11.
    IGC/PFBR/01120/SPECS/1018/R0/dt.25/04/2013Google Scholar

Copyright information

© ASM International 2019

Authors and Affiliations

  • V. Thomas Paul
    • 1
    Email author
  • S. Mahadevan
    • 1
  • S. C. S. P. Kumar Krovvidi
    • 2
  • Sunil Goyal
    • 1
  • S. Murugesan
    • 1
  • R. Thirumurugesan
    • 1
  • T. Ezhilarasi
    • 1
  • P. Parameswaran
    • 1
  • S. Raju
    • 1
  • S. Saroja
    • 1
  1. 1.Metallurgy and Materials GroupIndira Gandhi Centre for Atomic ResearchKalpakkamIndia
  2. 2.Fast Reactor Technology GroupIndira Gandhi Centre for Atomic ResearchKalpakkamIndia

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