Abstract
Neutron irradiation behavior of PNC316 stainless steel, which has been developed for prototype fast breeder reactor MONJU, was investigated up to a maximum dose of 185 dpa. Excellent swelling and creep properties of PNC316 were confirmed and are believed to be the best among this class of austenitic stainless steels. Performance of a Monju type fuel assembly was demonstrated at conditions more severe than those anticipated in Monju. Significant improvement in the swelling resistance of PNC316 was mainly due to the formation of a stable phosphide that traps helium bubbles and retards the conversion of bubbles to voids. Titanium or increased silicon addition apparently extended the dose for the phosphide dissolution and thus extended the swelling incubation period.
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