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By Crosswait, K.M.; Massachusetts Institute of Technology. Plasma Fusion Center.; United States. Dept. of Energy.; Oak Ridge Institute for Science and Education.; United States. Dept. of Energy. Office of Scientific and Technical Information

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Additional info for A passively-safe fusion reactor blanket with helium coolant and steel structure

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Mori,et. 21, May1992,p. 1744. g. ) Any workablefusionblanketdesignmustaccountfor the following considerations: (1) the allowableoperatingtemperaturerangesfor the materials;(2) irradiationeffectssuchasswellingandheliumproduction;(3) tritiumtransport characteristics; (4) chemicalcompatibility;and(5) possiblycomplexthermalconductivity characteristics, especiallywith pebblebeddesigns. These considerations, among others, must be kept in mind while striving to obtain the best possible tritium breeding, energy multiplication, and shielding performance in the least amount of space.

55 This level of swelling would make this steel clearly unacceptable for use in a fusion power reactor application. This high level of swelling, and the concomitant loss of ductility, can be reduced by proper alloying techniques. Advanced austenitic stainless steels, such as PCA (prime candidate alloy), have been developed which have much lower swelling values than conventional austenitic stainless steels. For these advanced alloys, up to 3 years of operation at a neutron wall load of 5 MW / m 2 should be achievable at temperatures up to 550 degrees C.

53 Although the radiation-induced swelling for ferfitic steels appears to be acceptably low, there is a significant shift in the ductile-to-brittle transition temperature (DBTT) for these steels during irradiation. The shift in DBTT appears to be the major issue of concern regarding the feasibility of these steels for use in fusion blankets, i A usten itic Stainless Steels Austenitic stainless steels have both nickel and chromium as alloying agents. Like ferritic steels, austenitic stainless steels have been used extensively in past engineering applications, including nuclear applications.

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