Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Effect of Hydride of the PHWR Pressure Tube on the LBB Evaluation

중수로 압력관의 수화물이 LBB평가에 미치는 영향

  • Published : 2004.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

The aim of this study was to investigate the hydride embrittlement when the LBB evaluation was carried out for the integrity of PHWR Pressure Tubes. The transverse tensile and CCT toughness tests were performed at three hydrogen concentrations while the test temperatures were changed (RT to 30$0^{\circ}C$). Both the transverse tensile and the fracture toughness tests showed the hydrogen embitterment clearly at RT but this phenomenon was disappeared while the test temperature arrived at 25$0^{\circ}C$. Using the DHC test results, the CCL and LBB time were calculated and compared. The hydride embrittlement at the LBB evaluation made the LBB time short definedly. If the operating temperature, DHCV and LBB deterministic parameters such as A and m were known, LBB time could be estimated without the calculation of CCL.

Keywords

References

  1. Moan, G.D., Coleman, C.E., Price, E.G., Rodgers, D.K. and Sagat, S. 1990, 'Leak-Before-Break in the Pressure Tubes of CANDU Reactors,' International Journal of Pressure Vessel & Piping, Vol. 43, pp. 1-21 https://doi.org/10.1016/0308-0161(90)90089-Z
  2. Coleman, C.E., Sagat, S., Shek, G.K., Graham, D.B. and Durand, M.A., 1990, 'Locating a Leaking Crack by Safe Stimulation,' International Journal of Pressure Vessel. & Piping, Vol. 43, pp. 187-204 https://doi.org/10.1016/0308-0161(90)90101-M
  3. Kim, Y.S., Boo, M.H., Oh, D.J., Kim, S.S. and Im, K.S., 2002, 'Fracture Behavior of Zr-2.5Nb Pressure Tube with Hydrides,' Proceedings of 2002 2nd KSME (Materials and Fracture Section), pp. 31-36
  4. Simpson, L.A., Chow, C.K. and Davies, P.H., 1989, 'Standard Test Method for Fracture Toughness of CANDU Pressure Tubes', AECL Report COG-89-110-1, AECL
  5. Himbeault, D.D. and Davies, P.H. 1999, 'Second International Round Robin on Fracture Toughness Testing of Pressure Tube Materials Using 17 mm Curved Compact (Toughness) Specimens,' AECL Report RC-2069, COG-98-161-1, AECL
  6. British Standards Institute, 1977, 'Plain Strain Fracture Toughness ($K_{IC}$) of Metallic Materials,' BS5447
  7. KAERI, 1999, 'Characterization Testing Procedures of Zr-2.5Nb Pressure Tubes,' KAERI/TR-1329/99
  8. American Society for Testing and Materials, 'Standard Test Method of Tension Testing of Metallic Materials,' ASTM E 8
  9. American Society for Testing and Materials, 'Standard Recommended Practice for Elevatd Temperature Tension Tests of Metallic Materials,' ASTM E 21
  10. American Society for Testing and Materials, 'Standard Test Method for J-Integral Characterization of Fracture Toughness,' ASTM E 1737-96
  11. American Society for Testing and Materials, 'Standard Test Method for Determining J-R Curves,' ASTM E 1152-87
  12. AECL, 1996, 'Fitness for Service Guidelines for Zirconium Alloy Pressure Tubes in Operating CANDU Reactor,' AECL Report COG-91-66
  13. Oh, D.J., Boo, M.H. and Kim, Y.S. 2003, 'Hydrogen Embrittlement of Zr-2.5Nb Pressure Tube at Room Temperature by Precipitated Hydride,' Transaction of KSME (A), Vol. 27, No. 3, pp. 455-463 https://doi.org/10.3795/KSME-A.2003.27.3.455