Integrity evaluation of lower thermal shield under exposure to HFBR environment

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Description

The effects of exposure to the HFBR environment on the carbon steel in the HFBR lower thermal shield were evaluated. Corrosion was found to be a non-significant degradation process. Radiation embrittlement has occurred; portions of the plate closest to the reactor are currently operating in the lower-shelf region of the Charpy impact curve (i.e., below the fracture toughness transition temperature). In this region, the effects of radiation on the mechanical properties of carbon steel are believed to have been saturated, so that no further deterioration is anticipated. A fracture toughness analysis shows that a large factor of safety (> 1.5) ... continued below

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47 p.

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Kassir, M.; Weeks, J.; Bandyopadhyay, K. & Shewmon, P. January 1, 1998.

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Description

The effects of exposure to the HFBR environment on the carbon steel in the HFBR lower thermal shield were evaluated. Corrosion was found to be a non-significant degradation process. Radiation embrittlement has occurred; portions of the plate closest to the reactor are currently operating in the lower-shelf region of the Charpy impact curve (i.e., below the fracture toughness transition temperature). In this region, the effects of radiation on the mechanical properties of carbon steel are believed to have been saturated, so that no further deterioration is anticipated. A fracture toughness analysis shows that a large factor of safety (> 1.5) exists against propagation of credible hypothetical flaws. Therefore, the existing lower thermal shield structure is suitable for continued operation of the HFBR.

Physical Description

47 p.

Notes

INIS; OSTI as DE98004414

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  • Other Information: PBD: Jan 1998

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  • Other: DE98004414
  • Report No.: BNL--65233
  • Grant Number: AC02-76CH00016
  • DOI: 10.2172/654107 | External Link
  • Office of Scientific & Technical Information Report Number: 654107
  • Archival Resource Key: ark:/67531/metadc709793

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  • January 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 9, 2015, 9:50 p.m.

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Kassir, M.; Weeks, J.; Bandyopadhyay, K. & Shewmon, P. Integrity evaluation of lower thermal shield under exposure to HFBR environment, report, January 1, 1998; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc709793/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.