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Estimation of acceptable beam-trip frequencies of accelerators for accelerator-driven systems and comparison with existing performance data

加速器駆動核変換システムにおける許容ビームトリップ頻度の評価と現状との比較

武井 早憲   ; 西原 健司  ; 辻本 和文 ; 大井川 宏之 

Takei, Hayanori; Nishihara, Kenji; Tsujimoto, Kazufumi; Oigawa, Hiroyuki

現存する大出力陽子加速器では頻繁にビームトリップ事象が発生するため、加速器駆動核変換システム(ADS)の未臨界炉を構成する機器に対して熱疲労損傷を生じる可能性がある。このビームトリップ事象が未臨界炉を構成する4か所の部位(ビーム窓,燃料被覆管,内筒,原子炉容器)に与える影響を調べるため、熱過渡解析を実施した。解析結果とプラントの稼働率を考察したところ、許容ビームトリップ頻度は年間$$42sim2times10^4$$回となった。この許容ビームトリップ頻度を現状の加速器の運転データから推測されるADS用陽子加速器のビームトリップ頻度と比較したところ、既にビームトリップ時間が10秒以下のビームトリップ頻度は許容値を満足していた。一方、ビームトリップ時間が10秒$$sim$$5分及び5分以上のビームトリップ頻度は、許容値を満足するために各々6分の1、35分の1に減少させる必要があることがわかった。

Frequent beam trips as experienced in existing high power proton accelerators may cause thermal fatigue problems in Accelerator-Driven System (ADS) components which may lead to degradation of their structural integrity and reduction of their lifetime. Thermal transient analyses were performed to investigate the effects of beam trips on the reactor components, with the objective of formulating the feasible ADS design and determining the requirements for accelerator reliability. From the aspect of the thermal stress and the annual plant availability, our results indicated that the acceptable beam-trip frequency was classified by three criteria, according to the beam trip duration, $$tau_b$$ : $$2times10^4$$ times per year for 0 $$leqtau_bleq$$ 10 s, $$2times10^3$$ for 10 s $$<tau_bleq$$ 5 min, and 42 for $$tau_b>$$ 5 min. And the annual plant availability was estimated to be 70 % or greater in cases where the beam trip frequencies decreased to the acceptable level. In order to consider measures to reduce the beam trip frequency of the high power accelerator for ADS, we compared the acceptable beam-trip frequency with the operational data of existing accelerators. The result of the comparison showed that the beam trip frequency with durations of 10 s or less was within the acceptable level. On the other hand, for the beam trip with durations of 10 s $$<tau_bleq$$ 5 min and $$tau_b>$$ 5 min, it is necessary to reduce the beam trip frequency to about $$frac{1}{6}$$ and $$frac{1}{35}$$ to satisfy the acceptable level, respectively.

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パーセンタイル:71.39

分野:Nuclear Science & Technology

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