High Temperature and Pressure Steam-H2 Interaction with Candidate Advanced LWR Fuel Claddings

Pint, Bruce A¹ 

[1] ORNL

关键词: ACCIDENTS;    ALLOYS;    AUSTENITIC STEELS;    CERAMICS;    OXIDATION;    STAINLESS STEELS;    STEAM;    STEELS;    TESTING;    TOLERANCE;    ZIRCALOY LOCA;    SiC;    FeCrAl;    Stainless Steel;    Steam;    Oxidation;   

DOI  :  10.2172/1050376
RP-ID  :  ORNL/TM-2012/254
PID  :  OSTI ID: 1050376
Others  :  Other: AF5810000
Others  :  NEAF278
Others  :  TRN: US201218%%995

学科分类：材料科学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

This report summarizes the work completed to evaluate cladding materials that could serve as improvements to Zircaloy in terms of accident tolerance. This testing involved oxidation resistance to steam or H{sub 2}-50% steam environments at 800-1350 C at 1-20 bar for short times. A selection of conventional alloys, SiC-based ceramics and model alloys were used to explore a wide range of materials options and provide guidance for future materials development work. Typically, the SiC-based ceramic materials, alumina-forming alloys and Fe-Cr alloys with {ge}25% Cr showed the best potential for oxidation resistance at {ge}1200 C. At 1350 C, FeCrAl alloys and SiC remained oxidation resistant in steam. Conventional austenitic steels do not have sufficient oxidation resistance with only {approx}18Cr-10Ni. Higher alloyed type 310 stainless steel is protective but Ni is not a desirable alloy addition for this application and high Cr contents raise concern about {alpha}{prime} formation. Higher pressures (up to 20.7 bar) and H{sub 2} additions appeared to have a limited effect on the oxidation behavior of the most oxidation resistant alloys but higher pressures accelerated the maximum metal loss for less oxidation resistant steels and less metal loss was observed in a H{sub 2}-50%H{sub 2}O environment at 10.3 bar. As some of the results regarding low-alloyed FeCrAl and Fe-Cr alloys were unexpected, further work is needed to fundamentally understand the minimum Cr and Al alloy contents needed for protective behavior in these environments in order to assist in alloy selection and guide alloy development.