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ASSCOPSコードによるナトリウム燃焼抑制槽の解析

Validation of ASSCOPS by results of large-scale demonstration test, Run-D2

宮原 信哉  ; 松木 卓夫*; 広井 博*; 姫野 嘉昭

not registered; Matsuki, Takuo*; Hiroi, Hiroshi*; Himeno, Yoshiaki

(目的)二次系ナトリウム漏洩事故の事象推移に関する総合模擬試験(Run-D2)に於けるナトリウム燃焼抑制槽の試験結果を用い、動燃で新たに開発したナトリウム燃焼抑制槽に対するナトリウム燃焼解析コードASSCOPSの適用性を検討した。(方法)解析では、槽内雰囲気の放射熱伝達に関してコード上の定義による熱放射係数をパラメータとし、以下の3ケースを実施した。(1)雰囲気は完全透明と仮定し、プール表面と構造材及び構造材間の熱放射係数は1.0 (2)雰囲気はエアロゾルによって不透明と仮定し、プール表面とエアロゾルの熱放射係数は0.65で、エアロゾルと構造材の熱放射係数は0.7 (3)雰囲気はエアロゾルによって不透明と仮定し、プール表面とエアロゾルの熱放射係数は0.65で、エアロゾルと構造材の熱放射係数は0.5 (結果)いずれのケースとも解析結果は試験結果と比較的良く再現しており、特に安全評価上重要となる槽内貯留ナトリウムの冷却特性に関しては良く一致した。各部温度の試験結果に対する解析結果の誤差は、過大評価側で約30%、過小評価側で約20%であった。(結論)ナトリウム燃焼解析コードASSCOPSは、動燃で新たに開発したナトリウム燃焼抑制槽の性能評価に対しても、十分適用できるとの結論を得た。

Post-test calculations of the large-scale sodium leak demonstration test, Run-D2, were performed using the ASSCOPS code in order to validate the applicability of the code to the evaluation of the fire suppression function of the PNC-type smothering tank. In the analysis, radiation coefficients between aerosols in the gas phase and structures and a pool surface in the smothering tank defined in the code were varied as parameter. The following three cases were calculated. (a)No aerosols suspending was assumed in the gas phase and thus, 1.0 was used as the coefficient between the structures and the pool surface. (b)The coefficient between the aerosols and the pool surface was 0.65, and that between structures and the aerosols was 0.73. (c)The coefficient between the aerosols and the pool surface was the same as case (b) and 0.5 was used as that between structures and the aerosols. The comparison between analysis and experiment with regard to the temperature of the various parts showed that the agreement was within +30% and -20%. From these results, it was concluded that the code was available for the evaluation of the fire suppression function of the smothering tank.

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