H. Mehmet ŞAHİN, Eşref BAYSAL, Adem ACIR

ThO2–UO2 YAKIT KARIŞIMINI İÇEREN CANDU YAKIT ÇUBUKLARINDAKİ SICAKLIK DAĞILIMININ SAYISAL ÇÖZÜMLENMESİ

Bu çalışmada; CANDU yakıt çubuklarındaki sıcaklık dağılımları sonlu farklar metodu kullanılarak incelenmiştir. Temel ısı iletim denklemleri, tanımlanan sınır şartlarıyla birlikte sayısal olarak çözülmüştür. Hesaplamalar sonlu farklar metoduna dayalı HEATING 7.2 bilgisayar kod sistemi kullanılarak yapılmıştır. Elde edilen simülasyon sonuçlarına göre, yakıt çubuklarında % 100 UO2 kullanılması sonucu Model j durumunda yakıtın merkezinde eksenel çizgideki maksimum sıcaklık 1764 °C olarak elde edilirken, UO2-ThO2 yakıt karışımında Model k, Model l ve Model m için ThO2 yakıt oranının artmasıyla yakıt çubuklarının merkezindeki eksenel çizgideki sıcaklık değerlerinin azaldığı görülmüş, sırasıyla 1213 °C, 944 °C ve 840 °C olarak elde edilmiştir. Ayrıca; yakıt çubuklarında oluşan sıcaklık dağılımının, yakıt ve zarf malzemesinin ergime sıcaklıklarından daha düşük olduğu tespit edilmiştir.

Anahtar Kelimeler:

CANDU yakıt çubuğu, sonlu farklar metodu, karışık nükleer yakıtlar.

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