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今泉 悠也; 青柳 光裕; 神山 健司; 松場 賢一; Akaev, A.*; Mikisha, A.*; Baklanov, V.*; Vurim, A.*
Annals of Nuclear Energy, 194, p.110107_1 - 110107_11, 2023/12
被引用回数：0 パーセンタイル：0.01(Nuclear Science & Technology)In severe accidents of SFRs, the cooling of the residual core materials, which is called "in-place cooling", is one of the important factors for In-Vessel Retention (IVR). For the evaluation, behavior of the in-place cooling was analyzed by the SIMMER-III code. In order to understand the in-place cooling, method of Phenomena Identification and Ranking Table (PIRT) was applied. Based on the result, an out-of-pile experiment which focused on the extracted factors was conducted. In the experiment, continuous oscillation of sodium level was observed by sodium vaporization and condensation. Analysis for the out-of-pile experiment was conducted by SIMMER-III, but the results were different between the experiment and the analysis. By investigation of the analysis result, it was revealed that the difference was due to occupation of non-condensable gas. Therefore, an analysis model of inter-cell gas mixing was newly developed, and the agreement was significantly improved by the new model.
今泉 悠也; 青柳 光裕; 神山 健司; 松場 賢一; Akayev, A. S.*; Mikisha, A. V.*; Baklanov, V. V.*; Vurim, A. D.*
第26回動力・エネルギー技術シンポジウム講演論文集(インターネット), 4 Pages, 2022/07
高速炉の炉心崩壊事故での炉心からの燃料流出後の残留炉心物質の冷却性は、炉心物質の配置に大きな影響を与え、それは炉容器内保持(IVR)達成のための重要な要素である。残留炉心物質の冷却は「インプレース冷却」と呼ばれ、その評価のため、実機の炉心での挙動をSIMMER-IIIで解析し、その解析結果に基づき重要度ランクテーブル(PIRT)の手法を適用した。そして、PIRTによって抽出された熱流動現象に着目した実験をEAGLE-3のフレームワークで実施した。実機のインプレース冷却の段階で発生し得る継続的な液位振動が実験では観察され、SIMMER-IIIで解析を実施した。解析結果の調査から、実験結果と解析結果の差異は、ナトリウム液位の上での非凝縮性ガスの残存と占有によることが分かったが、これは実験では非現実的だと考えられる。この問題を解決するため、非凝縮性ガスとナトリウム蒸気のガス混合モデルを開発し、その新モデルにより実験結果と解析結果の一致が大幅に改善された。
加藤 慎也; 松場 賢一; 神山 健司; Mikisha, A.*; Akayev, A.*; Vurim, A.*; Baklanov, V.*
no journal, ,
ナトリウム冷却高速炉の炉心崩壊事故時に想定されるナトリウム流路を通じた溶融炉心物質の流出挙動に関わる知見を拡充するため、溶融炉心物質の模擬物質として溶融アルミナを用い、縮流部を有するナトリウム流路へ浸入させる試験を実施した。本報では、試験結果を基に流路内部構造が流出挙動に与える影響を考察し報告する。
今泉 悠也; 青柳 光裕; 神山 健司; 松場 賢一; Akaev, A.*; Mikisha, A.*; Baklanov, V.*; Vurim, A.*
no journal, ,
The cooling of the residual degraded core materials, which is called "in-place cooling", is one of the important factors for the in-vessel retention (IVR). For the evaluation of the in-place cooling, behavior in a SFR core which is cooled down by the sodium inflow through CRGT was simulated by a safety analysis code, SIMMER-III. As a result of the analysis, the core materials which were initially 2500 
C were cooled down in several minutes. In order to analyze the in-place cooling, the method of phenomena identification and ranking table (PIRT) was applied, and several factors of thermal-hydraulic dynamics were extracted. Out-of-pile experiments which focus on the extracted factors were conducted, and continuous oscillations of sodium level were observed in the experiments. Analyses by SIMMER-III for the experiments were conducted, but the sodium level oscillation was not fully simulated in the analysis of IPCO-1. By investigation of the analysis result, it was revealed that the difference was due to partial occupation of non-condensable gas. In order to pre-vent the unrealistic occupation, the analysis model of inter-cell gas mixing was newly developed, and the agreement between experiment and analysis was significantly improved by that.
