Search by Bookstore
Holdings of Libraries in Japan
This page shows libraries in Japan other than the National Diet Library that hold the material.
Please contact your local library for information on how to use materials or whether it is possible to request materials from the holding libraries.
other
JOPSS:JAEA Originated Papers Searching System
DigitalYou can check the holdings of institutions and databases with which Institutional Repositories DataBase(IRDB)(Institutional Repository) is linked at the site of Institutional Repositories DataBase(IRDB)(Institutional Repository).
Search by Bookstore
Bibliographic Record
You can check the details of this material, its authority (keywords that refer to materials on the same subject, author's name, etc.), etc.
- Material Type
- 規格・テクニカルリポート類
- Author/Editor
- 神山 健司
- Publication Date
- 2003-06
- Publication Date (W3CDTF)
- 2003
- Alternative Title
- Improvement of SIMMER-III Freezing Model; A Study on a Semi-empirical Correlation for the Supercooling Temperature at the Melt/Structure Interface
- Periodical title
- JNC TN9400 2003-039
- Target Audience
- 一般
- Note (General)
- 出版タイプ： NAThe SIMMER-III code has been developed to evaluate the sequences of core disruptive accidents (CDAs) in fast reactors (FRs). In order to reasonably evaluate the mass of molten fuel remained in the core region and the consequence of re-criticality, it is important especially for the code to evaluate phenomena adequately such as ejection, freezing and blockage formation inside the escape path. The freezing model for the molten fuel has been developed and improved through the SIMMER-III phase 1 and 2 assessment programs. Especially, in the phase 2 assessments, knowledge of the metallurgy area was introduced, and it was found that a molten material formed the supercooling layer in the vicinity of structure wall and that the temperature of this layer dominated the energy loss of molten material and eventually the mass ejected into flow channel. This supercooling temperature was determined for each material based on the experimental result respectively as a constant input variable. 0n the other hand, experimental data used for the assessments of freezing model did not cover the temperature condition of CDA completely. In this study, a semi-empirical correlation which is comprised of thermophysical properties is proposed to predict supercooling temperatures, in order to increase reliability and accuracy of SIMMER-III freezing model. To attain the generality of this semi-empirical correlation, not only the experimental data with molten uranium dioxide but also the data with tin and wood's metal were used in the derivation of this correlation, which have different thermophysical properties and temperature conditions. In addition, it was confirmed through the evaluation of experimental data that this correlation could be applied to the molten stainless steel freezing phenomena.SIMMER-IIIコードは、高速増殖炉の炉心崩落事故時(CDA)における事象進展を評価するため開発が進められてきた。特に、コードが溶融した燃料が分散経路に流出、固化・閉塞を生じる現象を適切に評価できることは、炉心内に残存する燃料量と再臨界の影響を合理的に把握することに繋がるため重要である。溶融燃料の固化モデルはSIMMER-IIIコードの第1、2期検証研究を通じて改良されてきた。特に、第2期検証研究では冶金学の知見を取り入れ、融体と構造材の接触境界面に過冷却層が形成されること、この温度が融体の熱損失率を支配し融体分散量を定めることを見出した。この過冷却温度は、試験評価結果に基づいて物質毎に定め、入力にて一定値を与えていた。一方で、モデルの検証に用いた試験条件では、融体や構造材温度条件の点で実機CDAの想定範囲を十分に含んではいない。本研究では、固化モデルの信頼性および精度を高めるため、過冷却度を熱物性値にて予測できる半実験相開式を作成した。この相開式に一般性を持たせるため、二酸化ウランのみならず、異なる種類、温度条件を持つ錫および低融点合金の試験評価値も含めた。さらに、試験結果の評価により、この相開式は溶融ステンレス・スティールの固化挙動に対しても適用できることを確認した。
- Source
- /JNC-TN9400-2003-039.pdf （fulltext）