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Development of fuel transient test facility in JMTR

JMTRにおける燃料過渡試験装置の開発

木村 伸明 ; 松井 義典 ; 飛田 正浩*; 中村 仁一 ; 山浦 高幸 

Kimura, Nobuaki; Matsui, Yoshinori; Tobita, Masahiro*; Nakamura, Jinichi; Yamaura, Takayuki

材料試験炉(JMTR)において実施する軽水炉の燃料過渡試験では、キャプセル型の照射試験装置を用い、試験燃料の出力過渡時における健全性評価を行ってきた。照射試験に先立ち、ACE-3Dコードを用いたキャプセル内の熱流束挙動評価を行った。更に、試験燃料棒に替えて電気ヒーターピンを用いた炉外試験装置を設計・製作した。製作した炉外試験装置を用い、照射試験の成立性調査及び試験方法策定のための必要な試験を行った。これらの評価及び実験結果から、10$$times$$10 BWR新燃料の燃料過渡試験がJMTRにおいて成立することを確認した。

Power transient tests for the fuels of light water reactors were to be carried out in the Japan Materials Testing Reactor (JMTR) using capsule-type irradiation test facilities, and the integrity of the fuels had been to be investigated by the tests. Prior to the irradiation tests of the fuels, evaluation of thermal-hydraulic behavior in the capsule using ACE-3D code were carried out. And more, the out-pile test facility, which had an electric heater pin instead of a test fuel pin, was designed and fabricated to simulate the capsules used in the power transient tests. Using this facility, necessary tests for the realization of the irradiation tests and the planning of the test methods were carried out. From these analytical and experimental results, it was confirmed that the power ramping tests for 10$$times$$10 BWR fuel are able to achieve linear heat rate of 600W/cm in JMTR.

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