The high-temperature mechanical response of solid-state core monolith under operating condition
The mechanical properties of heat pipe-cooled reactor which is a preferred core for nuclear reactor batteries at high temperatures needs attention.Taking MegaPower as the object,a thermal-mechanical coupling calculation of the reactor under full power operation condition is carried out using the open source Monte Carlo program(OpenMC)and ANSYS mechanical.The results show:(1)The core monolith generates significant temperature and thermal stress concentration,with peak tempera-tures of 1 023 K for the fuel and 970 K for the monolith,and the highest thermal stress of 49.5 MPa for the monolith;(2)Because of the effect of high-temperature creep,the stress in the monolith decreases significantly,and the stress distribution tends to be uniform.(3)During the core operation,the total equivalent strain of the monolith changes slightly,while the reduction of the equivalent elastic strain and the increase of the equivalent creep strain is almost simultaneous and equal.
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