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Irradiation creep rates were determined for annealed and cold-worked AMCR- and 316-type steel alloys in the high flux reactor at Petten, for various irradiation temperatures, stresses and for neutron doses up to 4dpa. Primary creep elongations were found in all annealed materials. A negative creep elongation was found in cold-worked materials for stresses equal to or below about 100 MPa. An increase of the negative creep elongation was found for decreasing irradiation temperatures and decreasing applied stresses. The stress exponent of the irradiation creep rate in annealed and cold-worked AMCR alloys is n = 1.85 and n = 1.1, respectively. The creep rates of cold-worked AMCR alloys are almost temperature independent (Q(irr) = 0.132 eV) over the range investigated (573-693 K). The results obtained are compared with those obtained in ORR and EBR II. The smallest creep rates are found for cold-worked materials of AMCR and US-PCA type at Petten, which are about a factor of two smaller than the creep rates obtained for US-316 at Petten, for US-PCA at ORR or for 316L at EBR II. The scatter band factor for US-PCA, 316L, US-316 irradiated in ORR and EBR II is about 1.5 after a temperature and damage rate normalisation.

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Authors: HAUSEN H, JRC Petten (NL);CUNDY M R, JRC Petten (NL);SCHÜLE W, JRC Ispra (IT)
Bibliographic Reference: EUR 13193 EN (1991) 12 pp., MF, ECU 4, blow-up copy ECU 5
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