Induced nuclear reactions: processes – systems – and elements – Handling of fission reactor component structure within...
Patent
1998-03-30
1999-11-23
Carone, Michael J.
Induced nuclear reactions: processes, systems, and elements
Handling of fission reactor component structure within...
376277, 376305, 436 6, 436908, G21C 1900
Patent
active
059913525
ABSTRACT:
A method for determining the susceptibility of a sample of Zircaloy alloy to nodular corrosion. A specimen of such Zircaloy sample is annealed at a temperature within a temperature range bounded at its upper limit by the temperature T.sub.c being the temperature at equilibrium wherein sufficient solute would exist in the (.alpha.-matrix of the particular zircaloy to resist nodular corrosion, and bounded by a lower temperature, such temperature being the temperature of the (.alpha.+precipitate)/(.alpha.+.beta.+precipitate) transus for the particular Zircaloy sample. For Zircaloy-2, such temperature range is from approximately 825.degree. C. to 841.degree. C. The specimen is maintained at such selected temperature within such temperature range for a measured period, and subsequently exposed to steam at a fixed temperature and pressure for a fixed time. If nodular corrosion does not appear the above steps are repeated, but on each different specimen increasing the measured time period until a last measured time period is obtained when nodular corrosion first appears on a specimen. The length of the last measured time period is used as an indicator of the sample's resistance to nodular corrosion, and thus conversely its susceptibility to nodular corrosion.
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Carone Michael J.
General Electric Company
Johnson Noreen C.
Keith Jack
Maddry Tyler
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