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EFEK PENAMBAHAN DOPAN TERHADAP KARAKTERISTIK PELET UO2 SINTER Etty Mutiara; Tri Yulianto
Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol 19, No 2 (2013): JUNI 2013
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2013.19.2.1767

Abstract

ABSTRAK.EFEK PENAMBAHAN DOPAN TERHADAP KARAKTERISTIK PELET UO2 SINTER. Telahdikembangkan bahan bakar PWR berderajat bakar tinggi melalui fabrikasi pelet UO2 denganmenambahkan dopan Cr2O3, MgO atau V2O5. Penambahan dopan dimaksudkan agar diperolehpelet UO2 dengan karakteristik yang lebih baik yang ditandai dengan pelet berbutir besar dandensitas yang lebih besar dari 94% TD. Pada pelet UO2 sinter berbutir besar, jalur difusi bebasrerata akan meningkat dan akan menurunkan laju pelepasan gas hasil fisi sehingga derajatbakarnya dapat ditingkatkan. Fabrikasi pelet UO2 berbutir besar dilakukan dengan menambahkan 0,1% sampai 0,9% berat dopan Cr2O3, MgO atau V2O5 pada saat pengompakan pelet UO2 dan disinter pada temperatur 1700 0C dengan laju pemanasan 250 0C per jam selama 4 jam dalam suasana gas hidrogen. Selanjutnya dilakukan karakterisasi pelet sinter UO2-dopan yang meliputi pengujian visual, pengukuran dimensi, pengukuran densitas dan uji ceramografi untuk mendapatkan informasi tentang pengaruh penambahan dopan terhadap karakteristik (besar butir dan densitas) pelet sinter UO2-dopan. Dari kegiatan ini akan dapat ditentukan jenis dopan yang paling efektif mempengaruhi proses sinter pada prosentase penambahan tersebut serta diperoleh pelet UO2 berbutir besar yang memenuhi persyaratan densitas dalam rangka peningkatan kehandalan bahan bakar UO2 sebagai bahan bakar PWR berderajad bakar tinggi.Kata kunci: pelet, UO2, sintering, dopan, butir besar, densitas.ABSTRACTEFFECT OF DOPANT ADDITION ON THE CHARACTERISTIC OF UO2 PELLETS. A high burnupUO2 fuel pellet has been developed by doopant addition. The purpose of adding a smallamount Cr2O3, MgO or V2O5 dopant below 1% weight into UO2 matrix is to obtain bettercharacteristic of UO2 pellet with coarser grains and higher density.In large grain microstructure of UO2 pellet, as the mean value of gas diffusion free path increases, the amount of fission gasreleased from the pellet will be suppressed, and the fuel burn-up can be increased. Thefabrication of doped-UO2 pellets was done by compacting a mixture of UO2–dopant powder andsintering at a temperature of 1750 oC with holding time of 4 hours in hydrogenatmosphere.Characterization of UO–dopant pellet involves visual examination, dimensional anddensity measurement, and ceramography test to study the effect of dopant addition on densityand grain size. In this research, the determination of the specific amount of dopant into UO2 matrix is technically important for the acquisition of large grains microstructure to meet the density requirements in order to improve the reliability ofhigh burn-up UO2 fuel.Keywords: pellet, UO2, sintering, dopant, large grain, density
PENGARUH BURN-UP TERHADAP KARAKTERISTIK PELET SINTER SIMULASI BAHAN BAKAR BEKAS Erilia Yusnitha; Tri Yulianto; Etty Mutiara
Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol 19, No 3 (2013): Oktober 2013
Publisher : website

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2013.19.3.1799

Abstract

ABSTRAK PENGARUH BURN-UP TERHADAP KARAKTERISTIK PELET SINTER SIMULASI BAHAN BAKAR BEKAS. Telah dilakukan penelitian pengaruh burn-up terhadap karakteristik pelet sinter simulasi bahan bakar bekas dengan variasi burn-up 40 MWd/kgU dan burn-up 60 MWd/kgU. Penelitian ini bertujuan untuk mendapatkan karakter bahan bakar bekas simulasi yang diharapkan mampu mendekati sifat dan karakter bahan bakar bekas yang sebenarnya. Karakterisasi serbuk simulasi hasil fisi dengan variasi burn-up yang dianalisis antara lain bulk density, tap density, surface area dan rasio O/U. Hasil pengukuran serbuk simulasi hasil fisi dengan burn-up 40 MWd/kgU antara lain bulk density : 1,0250 g/cm3, tap density : 1,9330 g/cm3, surface area : 0,8751 m2/g dan rasio O/U : 2,0319, sedangkan untuk serbuk simulasi hasil fisi dengan burn-up 60 MWd/kgU diperoleh bulk density : 1,3410 g/cm3, tap density : 2,0443 g/cm3, surface area : 2,6688 m2/g dan rasio O/U : 2,0381. Kemudian serbuk simulasi hasil fisi dengan burn-up 40 MWd/kgU dilakukan pengompakan pada tekanan 3 Mp, 4 Mp, 5 Mp, 6 Mp, 8 Mp dan 9 Mp. Serbuk simulasi bahan fisi dengan burn-up 60 MWd/kgU pengompakan pada tekanan 4 Mp, 6 Mp, 7 Mp, 8 Mp dan 9 Mp. Masing-masing hasil proses pengompakan dilakukan penyinteran menjadi pelet sinter simulasi bahan bakar bekas kemudian dikarakterisasi densitas dan mikrostrukturnya. Densitas tertinggi pelet sinter simulasi hasil fisi dengan burn-up 40 MWd/kgU maupun burn-up 60 MWd/kgU terdapat pada tekanan pengepressan 9 Mp yaitu masing-masing sebesar 9,9959 g/cm3 dan 9,5490 g/cm3. Pengamatan mikrostruktur menunjukkan semakin besar burn-up menyebabkan semakin kecil ukuran butir pelet sinter. Kata kunci: simulasi hasil fisi, tap density, bulk density, surface area, rasio O/U, mikrostruktur.   ABSTRACT EFFECT OF BURN-UP ON THE CHARACTERISTICS OF SINTERED PELLETS OF SIMULATED SPENT FUEL. Effect of burn-up on the characteristics of sintered pellets of simulated spent fuel with burnup variation of 40 MWd/kgU and 60 MWd/kgU has been studied. The aim of this research is to obtain simulated spent fuel whose properties and characteristics are in close agreement with sintered pellets of spent fuel.  The characteristics of simulated fission products powder for variation of burn-up such as bulk density, tap density, O/U ratio, and surface area were measured. The measurement result for simulated fission products powder of 40 MWd/kgU burn-up are bulk density : 1.0250 g/cm3, tap density : 1.9330 g/cm3, O/U ratio: 2.0319 and surface area : 0.8751 m2/g, while the measurement result of simulated fission products powder of 60 MWd/kgU burn-up are bulk density : 1.3410 g/cm3, tap density: 2.0443 g/cm3, O/U ratio: 2.0381 and surface area : 2.6688 m2/g. The simulated fission products powder of 40 MWd/kgU burn-up were pressed at a pressure of 3 Mp, 4 Mp, 5 Mp, 6 Mp, 8 Mp and 9 Mp, and the simulated fission products powder of 60 MWd/kgU burn-up were pressed at a pressure of 4 Mp, 6 Mp, 7 Mp, 8 Mp and 9 Mp to produce green pellets. The green pellets were sintered to produce simulated sintered pellets of spent fuel. The characteristics of simulated sintered pellets of spent fuel such as density and microstructure were measured. The highest density of the simulated spent fuel for 40 MWd/kgU burn-up and 60 MWd/kgU burn-up was obtained at a pressure of 9 Mp, i.e. 9.9959 g/cm3 and 9.5490 g/cm3 respectively. The microstructure analysis shows that the grain size of the sintered pellets decreases with increasing burn-up. Keywords: simulated fission product, tap density, bulk density, surface area, O/U ratio, microstructure.
Co-Authors Erilia Yusnitha Tri Yulianto