SEDL / STP / STP1405-EB / STP10552S

Irradiation Creep Deformation of Modified 316 and 15Cr-20Ni Base Austenitic Fuel Elements Irradiated in FFTF

Uehira, A
Researcher, Japan Nuclear Cycle Development Institute, Ibaraki,

Ukai, S
Senior researcher and Assistant senior researcher, Japan Nuclear Cycle Development Institute, Ibaraki,

Mizuta, S
Senior researcher and Assistant senior researcher, Japan Nuclear Cycle Development Institute, Ibaraki,

Puigh, RJ
Manager, Pacific Northwest National Laboratory, Richland, WA

Pages: 13    Published: Jan 2001

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Abstract

Irradiation creep of modified 316 (PNC316) and 15Cr-20Ni base austenitic stainless steels was determined using the diametral change of the fuel pins, which were irradiated under the fission gas pressurized condition in FFTF to a peak displacement damage of 107 dpa in PNC316 and 120 dpa in 15Cr-20Ni base. The creep compliance B⁰ and creep-swelling coupling coefficient D were found to be 1.1 to 3.0 × 10^-6 MPa^-1 dpa^-1 and up to 1.3 × 10^-2 MPa^-1 for instantaneous volumetric swelling rate, respectively. Those are almost the same level as those derived using the pressurized tubes irradiated in FFTF-MOTA. D values tend to decrease and disappear with developing void swelling.