Assessment of Failure Mechanisms for GFR Vented Fuel Pins Using Hexology Cladding. International Conference on Reactor Physics, Nuclear Power: A Sustainable Resource (Preprint).

Gan, J.

Technical Information Center Oak Ridge Tennessee

关键词: Meetings;    Reactor physics;    Carbides;    Burnup;    Mixed carbide fuels;   

RP-ID  :  DE2008940068

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

A near-term vented fuel pin concept as a back-up option for the gas-cooled fast reactor (GFR) system was evaluated. This work explored the feasibility of using mixed carbide fuel (U0.85P0.15)C with off-the-shelf monolithic SiC clad in order to meet requirements for GFR fuel with an average burnup of 10%. The stress loading on the SiC cladding due to fuel swelling and thermal stress due to temperature gradient were estimated based on the data from the development of carbide fuels in the 1970s-1980s and the materials properties for SiC tubes. The fuel swelling at the goal burnup (10%) is expected to produce a hoop stress of approximately 32 MPa in cladding, approaching the estimated maximum allowable hoop stress (approx. 33 MPa) for a SiC cladding reliability of 99.99%. The estimated tensile thermal stress component (approx. 121 MPa) near the outer surface of a monolithic SiC cladding is likely to limit its application at high temperatures.