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Material type: 文書・図像類

Author: 佐藤一憲ほか

Publisher: -

Publication date: 2001-03

Material Format: Digital

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Note (General)：: In the CABRI-FAST LT1 test, simulating a ULOF (Unprotected Loss of Flow) accident of LMFBR, pin failure took place rather early during the transient. ...

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Summary, etc.：: In the CABRI-FAST LT1 test, simulating a ULOF (Unprotected Loss of Flow) accident of LMFBR, pin failure took place rather early during the transient. ...

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Material Type: 文書・図像類
Title: None
Author/Editor: 佐藤一憲
小野田雄一
Author Heading: 佐藤一憲
小野田雄一
Publication Date: 2001-03
Publication Date (W3CDTF): 2001-03
Alternative Title: Interpretation of the CABRI LT1 test with SAS4A-code analysis
Periodical title: JNC TN9400 2001-048
Text Language Code: eng
Target Audience: 一般
Note (General): In the CABRI-FAST LT1 test, simulating a ULOF (Unprotected Loss of Flow) accident of LMFBR, pin failure took place rather early during the transient. No fuel melting is expected at this failure because the energy injection was too low and a rapid gas-release-like response leading to coolant-channel voiding was observed. This channel voiding was followed by a gradual fuel breakup and axial relocation. With an aid of SAS4A analysis, interpretation of this test was performed. Although the original SAS4A model was not well fitted to this type of early pin failure, the global behavior after the pin failure was reasonably simulated with temporary modifications. Through this study, gas release behavior from the failed fuel pin and its effect on further transient were well understood. It was also demonstrated that the SAS4A code has a potential to simulate the post-failure behavior initiated by a very early pin failure provided that necessary model modification is given.
高速増殖炉のULOF(Unprotected Loss of Flow)事故を模擬したCABRI-FASTLT1試験では、過渡中の早期の段階でピン破損を生じた。この時点での燃料へのエネルギー投入は極めて小さく、燃料は未溶融と考えられる。ピン破損後は急速なガス放出と見られる冷却材応答が観測され、流路はボイド化した。このボイド化の後、燃料は連続的に崩壊し軸方向に移動した。本研究ではSAS4Aコードを用いた解析を実施し、その結果を参考にして本試験の解釈を行った。オリジナルSAS4Aコードのモデルは、本試験のような燃料ピン早期破損時の破損後挙動評価には十分に対応したものではないが、本試験の状況を反映した特殊な取扱いを導入することにより、破損後の挙動を適正に模擬することができた。この研究を通じて、早期破損ピンからのガス放出挙動及びその後の挙動へのガス放出の影響が明らかになった。また、必要なモデル変更を前提として、SAS4Aコードによる燃料ピン早期破損からの挙動模擬のポテンシャルを示した。
Source: /JNC-TN9400-2001-048.pdf （fulltext）
https://jopss.jaea.go.jp/pdfdata/JNC-TN9400-2001-048.pdf
Access Restrictions: 限定公開
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