Irradiation-induced instability of MnS precipitates and its possible contribution to IASCC in light water reactors

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Although a number of candidate mechanisms have been proposed to participate in the IASCC phenomenon, it is not clear at this time that all of the contributing mechanisms have been identified. A new mechanism was proposed by Garner and Greenwood as a potential contribution to IASCC that involves the radiation-induced release into solution of sulphur and other deleterious elements that are normally concentrated into MnS precipitates. The instability arises from the combined action of the transmutation of manganese to iron, cascade-induced mixing and the very strong action of the inverse Kirkendall effect. The latter mechanism acts as a pump to ... continued below

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5 p.

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Garner, F.A.; Greenwood, L.R. & Chung, H.M. October 1, 1997.

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Although a number of candidate mechanisms have been proposed to participate in the IASCC phenomenon, it is not clear at this time that all of the contributing mechanisms have been identified. A new mechanism was proposed by Garner and Greenwood as a potential contribution to IASCC that involves the radiation-induced release into solution of sulphur and other deleterious elements that are normally concentrated into MnS precipitates. The instability arises from the combined action of the transmutation of manganese to iron, cascade-induced mixing and the very strong action of the inverse Kirkendall effect. The latter mechanism acts as a pump to export manganese from the precipitate surface and to replace it primarily with iron, as well as smaller amounts of chromium, nickel and other lesser elements. Evidence previously presented by Chung and coworkers appears to show that MnS precipitates in typical 300 series stainless steels become progressively depleted in manganese and enriched with iron as irradiation proceeds in boiling water reactor neutron spectra. It is shown in this paper that transmutation alone is insufficient to produce the observed behavior.

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5 p.

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INIS; OSTI as DE98000642

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  • 8. international symposium on environmental degradation of materials in nuclear power systems-water reactors, Amelia Island, FL (United States), 10-14 Aug 1997

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  • Other: DE98000642
  • Report No.: ANL/ET/CP--94587
  • Report No.: CONF-970832--
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 539891
  • Archival Resource Key: ark:/67531/metadc692348

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  • October 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Aug. 4, 2016, 7:22 p.m.

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Garner, F.A.; Greenwood, L.R. & Chung, H.M. Irradiation-induced instability of MnS precipitates and its possible contribution to IASCC in light water reactors, article, October 1, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc692348/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.