Comparison of beam trip frequencies between estimation from current experimental data of accelerators and requirement from ADS transient analyses

Takei, Hayanori   ; Tsujimoto, Kazufumi ; Ouchi, Nobuo ; Oigawa, Hiroyuki ; Mizumoto, Motoharu*; Furukawa, Kazuro*; Ogawa, Yujiro*; Yano, Yoshiharu*

Frequent beam trips as experienced in existing high power proton accelerators may cause thermal fatigue problems in ADS components. Thermal transient analyses were performed to investigate the effects of beam trips on the reactor components. Our results indicate that the acceptable frequency of beam trips ranges from 50 to 25,000 times per year, depending on the beam trip duration. In order to measure the effect of reducing beam trips on the high power accelerator for ADS, we compared the difference between the acceptable frequency for beam trips and the operation data of existing accelerators. The result of this comparison shows that for typical conditions the beam trip frequency for durations of 10 seconds or less is within the acceptable level, while that exceeding 10 seconds should be reduced by about 1/30 to satisfy the thermal stress conditions.