SAS4Aコード解析によるCABRI LT4試験評価

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Author: 小野田雄一ほか

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Publication date: 2001-03

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Note (General)：: The LT4 test was performed in the CABRI-FAST in-pile experiment program carried out in 1992$\sim$1995. The objectives of this test were to study the f...

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Summary, etc.：: The LT4 test was performed in the CABRI-FAST in-pile experiment program carried out in 1992$\sim$1995. The objectives of this test were to study the f...

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Material Type: 文書・図像類
Title: SAS4Aコード解析によるCABRI LT4試験評価
Author/Editor: 小野田雄一
佐藤一憲
Author Heading: 小野田雄一
佐藤一憲
Publication Date: 2001-03
Publication Date (W3CDTF): 2001-03
Alternative Title: Interpretation of the CABRI LT4 test with SAS4A-code analysis
Periodical title: JNC TN9400 2001-047
Text Language Code: eng
Target Audience: 一般
Note (General): The LT4 test was performed in the CABRI-FAST in-pile experiment program carried out in 1992$\sim$1995. The objectives of this test were to study the fuel pin failure mechanism and to observe the transient fuel motion within the pin and in the coolant channel. The objectives of the present study are to clarify phenomena taking place in the experiment through data evaluation and SAS4A code analysis. Various experimental data have been analyzed with a help of SAS4A code calculation to interpret fuel pin failure mechanism and post-failure material relocation behavior. Through this study, the rapid fissile elongation up to the fuel pin failure was recognized to have potential to delay the failure by about 50 ms, and Probable effect of plenum gas to enhance dispersive fuel relocation has been recognized. And it was confirmed that SAS4A can reasonably simulate rapid molten-fuel ejection from failed fuel pin, rapid fuel relocation within the coolant channel assisted by the Plenum-gas and the fuel freezing in the last Part of transient.
CABRILT4試験は、中空燃料のULOF(Unprotected Loss of Flow)事故時の挙動研究を目的として1997年3月11日に実施された。本試験では、燃料ピンが過渡中に破損し、破損部からの溶融燃料の放出と、これに伴う冷却材流路のボイド化、及びボイド化流路中での燃料分散が観測された。本試験の破損後挙動評価にSAS4Aコードを適用した。これにより、試験結果に対する現象論的理解が大きく深められた。また、中空燃料を用いた本試験での高いエネルギー破損条件における破損後挙動に対するSAS4Aモデルの基本的適用性を確認した。さらに、本試験に用いた燃料ではガス・プレナムからの急速なガス放出が溶融燃料の放出挙動に影響を与えていることが認識された。この効果は燃料分散を加速する。したがって、燃料設計に依存し、溶融燃料放出と分散の挙動をより正確に評価するためには、プレナム・ガス放出の影響を慎重に考慮する必要がある。
Source: /JNC-TN9400-2001-047.pdf （fulltext）
https://jopss.jaea.go.jp/pdfdata/JNC-TN9400-2001-047.pdf
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Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 日本原子力研究開発機構 : JOPSS:JAEA Originated Papers Searching System