VVER-1000 Reaktöründe Alüminyum Nanoparçacıklı Soğutucunun Termal Performansının İncelenmesi

Nükleer güç reaktörlerinin güvenlik ve tasarım özellikleri incelenirken termal analizlerin önemi büyüktür. Bu çalışmada amaç, saf ve Al2O3 nano parçacık içeren soğutucu akışkanların VVER -1000 nükleer reaktör termal performansına etkisinin incelenmesidir. Bu amaçla, VVER-1000 reaktörünün denge durumunda (sürekli rejimde) ve BOC (döngü başlangıcı) koşulunda, 3.7 % zenginlikte ki UO2 yakıt için bağıl güç yoğunluk dağılımları MCNP kodu ile elde edilmiş ve daha sonra COBRA kodu ile termal analizler yapılarak, reaktörün güvenlik kriterleri için önem arzeden DNBR (departure from nucleate boiling ratio) değeri incelenmiştir. Ayrıca COBRA kodu ile reaktörde kullanılan soğutucu akışkanlara ait sıcaklık, entalpi, yoğunluk gibi termal değerler ve yakıt ve zarf bölgelerine ait sıcaklık değerleri hesaplanmıştır. Yapılan analizler sonucu, nano akışkan kullanımında reaktörün ısı iletiminde en verimli oranın % 0.1 oranında Al2O3 olduğu belirlenmiştir.

Anahtar Kelimeler:

Nano akışkan, ısı transferi, VVER-1000, MCNP, keff

Investigation of Thermal Performance of Aluminum Nanoparticle Coolant in VVER-1000 Reactor

Thermal analysis is of great importance when examining the safety and design features of nuclear power reactors. The aim of this study is to examine the effect of pure and containing Al2O3 nanoparticles coolant on VVER -1000 nuclear reactor thermal performance. In this study, the VVER-1000 reactor is in steady state and BOC (begining of cycle) condition, relative power density distributions varying according to 3.7% enrichment UO2 fuel were obtained with the MCNP code and then, thermal analyzes were made with the COBRA code and DNBR value, which is very important for the safety criteria of the reactor, was examined. In addition, with the COBRA code, thermal values such as temperature, enthalpy, density, and temperature values of the fuel and clad regions, which are of great importance for the reactor, were calculated. As a result of the analyzes, it was determined that the most efficient rate of 0.1% Al2O3 in the heat transfer of the reactor in the use of nano fluid.

Keywords:

Nanofluid, heat transfer, VVER-1000, MCNP, keff,

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