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論文

Fuel pin behavior under slow-ramp-type transient-overpower conditions in the CABRI-FAST experiments

深野 義隆; 小野田 雄一; 佐藤 一憲; Charpenel, J.*

Journal of Nuclear Science and Technology, 46(11), p.1049 - 1058, 2009/11

 被引用回数:17 パーセンタイル:73.05(Nuclear Science & Technology)

In the CABRI-FAST experimental program, four in-pile tests were performed with slow-power-ramptype transient-overpower conditions (called hereafter as "slow TOP") to study transient fuel pin behavior under inadvertent control-rod-withdrawal-type events in liquid-metal-cooled fast breeder reactors. The slow TOP test with a preirradiated solid-pellet fuel pin under a power ramp rate of approximately 3%Po/s was realized as a comparatory test against an existing test in the CABRI-2 program where approximately 1%Po/s was adopted with the same type of fuel pin. In spite of the different power ramp rates, the evaluated fuel thermal conditions at the observed failure time are quite similar. Three slow TOP tests with the preirradiated annular fuel resulted in no pin failure showing a high failure threshold. These CABRI-FAST slow TOP tests, in combination with the existing CABRI and TREAT tests, provided an extended slow TOP test database under various fuel and transient conditions.

論文

Fuel pin behavior under slow ramp-type transient-overpower conditions in the CABRI-FAST experiments

深野 義隆; 小野田 雄一; 佐藤 一憲; Charpenel, J.*

Proceedings of 13th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-13) (CD-ROM), 13 Pages, 2009/10

In the CABRI-FAST experimental program, four in-pile tests were performed with slow power-ramp-type transient-overpower conditions to study transient fuel pin behavior under inadvertent control rod withdrawal events in liquid metal cooled fast breeder reactors. Annular-pellet fuel pins were used in three tests, while a solid-pellet fuel pin was used in the other test. All of these pins were pre-irradiated in Phenix. The slow TOP test with a solid-pellet fuel pin was realized as a comparatory test against an existing test (E12) in the CABRI-2 program. In the CABRI-FAST test (BCF1), a power ramp rate of 3%Po/s was applied, while in the CABRI-2 test, 1%Po/s was adopted. In spite of the different power ramp rates, evaluated fuel thermal conditions at the observed failure time are quite similar. The continued overpower condition in the BCF1 test resulted in gradual degradation of the pin structure providing information effective for evaluation of various accident scenarios. Three slow TOP tests with the annular fuel in the CABRI-FAST program resulted in no pin failure showing high failure threshold. These CABRI FAST slow TOP tests, in combination with the existing CABRI and TREAT tests, provided an extended slow TOP test database with various fuel and transient conditions.

論文

The Adventitious-pin-failure study under a slow power ramp

深野 義隆; Charpenel, J.*

Proceedings of 12th International Conference on Nuclear Engineering (ICONE-12) (CD-ROM), 8 Pages, 2004/04

日仏共同CABRI-RAFT計画におけるRB1, RB2試験データの詳細な分析及びPAPAS-2S, PHYSURACコードによる解析評価を実施し、これらに基づいて試験結果の解釈を行った。本研究を通じて、低スミア密度燃料では、スリット型の被覆管破損を想定しても軽微な燃料溶融の範囲では、溶融燃料の放出は抑制されることが示された。一方、大量の燃料溶融により、溶融キャビティ外側の固相燃料殻の薄い条件では、溶融燃料の放出を生じ得ることも明らかにした。しかしながら、低スミア密度燃料では、高スミア密度燃料と比較すると溶融燃料の放出速度も緩慢となるとともに、放出燃料量に依存して冷却性が成立し得ることがわかった。

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