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The Effects of Phase Stability on Void Swelling in P, Ti-Modified 316 Stainless Steels During Neutron Irradiation

Ukai, S
Manager, assistant senior engineer, engineer and assistant senior engineer,O-arai Engineering Center, Power Reactor and Nuclear Fuel Development Corporation,

Akasaka, N
Manager, assistant senior engineer, engineer and assistant senior engineer,O-arai Engineering Center, Power Reactor and Nuclear Fuel Development Corporation,

Hattori, K
Manager, assistant senior engineer, engineer and assistant senior engineer,O-arai Engineering Center, Power Reactor and Nuclear Fuel Development Corporation,

Onose, S
Manager, assistant senior engineer, engineer and assistant senior engineer,O-arai Engineering Center, Power Reactor and Nuclear Fuel Development Corporation,

Pages: 14    Published: Jan 1999

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Source: STP1325-EB

Abstract

Commercially developed 20% cold-worked P,Ti-modified 316 stainless steel claddings were irradiated as fuel pins in C-type irradiation rigs of JOYO under typical fast reactor conditions. The microstructural changes of irradiated claddings at temperatures around 500 °C were extensively analyzed using transmission electron microscopy. Void formation is closely related with M⁶C and G-phase precipitates and concomitant phosphide dissolution beyond the fast neutron fluence of 15x10²⁶ n/m². Such phase instability in the fuel pin cladding during the fast reactor operation is caused by the radiation induced solute segregation, and it mainly interpreted in terms of varying system sink strength due to dislocation and precipitate changes.

Keywords:
316 stainless steel, JOYO, microstructure change, irradiation, void, M, 6, C, G-phase, phosphide, phase instability, dislocation

Paper ID: STP13905S
Committee/Subcommittee: E10.07
DOI: 10.1520/STP13905S
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