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This paper presents a high power density motor design process of a thrust vector control (TVC) system to modify the thrust vector of the gimbal engine of a space launch vehicle. For this system, the high power density motor designing requires computation of the maximum current density by considering the driving environment, operating conditions, and electromagnetic optimum design process. This paper describes the computation of the maximum allowable current density in vacuum, which is the driving environment of a TVC drive motor. In addition, a Halbach magnet array structure is applied as a high output density design method for a surface-mounted synchronous motor. The characteristics of the output and loss of this structure are compared with those of an existing design. Moreover, we highlight the advantages of applying a Halbach magnet array in terms of the demagnetization resistance. [ABSTRACT FROM AUTHOR]

This paper suggests a fracture simulation method for SFR metallic fuel pin under accident condition. Two major failure mechanisms - creep damage and eutectic penetration - are implemented in the suggested method. To simulate damaged element, stress-reduction concept to reduce stiffness of the damaged element is applied. Using the proposed method, the failure size of cladding can be predicted in addition to the failure time and failure site. To verify the suggested method, Whole-pin furnace (WPF) test and TREAT-M test conducted at Argonne National Laboratory (ANL) are simulated. In all cases, predicted results and experimental results are overall in good agreement. Based on the simulation result, the effect of eutectic-penetration depth representing failure behavior on failure size is studied.