Abstract

The neutron embrittlement response of the Mn-Mo-Ni/Linde 80 submerged-arc weld metals are evaluated. The original evaluations of the weld metals indicated a high sensitivity to neutron radiation. This paper reviews studies to determine the role of initial properties on the irradiated properties, the relationship of weld wire and weld flux on cross referencing irradiated data, and the role of irradiation temperature. Evaluation of irradiated data as a function of initial toughness value suggest that it may not be necessary to know the unirradiated values to be able to predict the irradiated behavior. This would reduce the uncertainty of the irradiated value. A phenomenon defined as stabilization, was observed wherein further irradiation damage is counteracted by the annihilation, or annealing, of previously formed damage. A correlation is presented to accommodate differences in irradiation temperature for power reactor data. A correlation is presented for predicting the irradiation induced reduction of Charpy upper-shelf energy based on the irradiated value rather than a ratio based on the unirradiated upper-shelf energy. A standard error for the irradiated Charpy upper-shelf data is given.

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