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All Journal Urania Jurnal Ilmiah Daur Bahan Bakar Nuklir Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir
Winter Dewayatna
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Materials Science & Nanotechnology

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PENGARUH METODE PREPARASI BROTH DAN JENIS PREKURSOR ZIRKONIUM PADA KARAKTERISTIK KERNEL YTTRIA-STABILIZED ZIRCONIA (YSZ) Sarjono Sarjono; Etty Mutiara, M.Eng; Erilia Yusnitha; Winter Dewayatna
Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol 26, No 1 (2020): Februari, 2020
Publisher : website

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (418.542 KB) | DOI: 10.17146/urania.2020.26.1.5743

Abstract

PENGARUH METODE PREPARASI BROTH DAN JENIS PREKURSOR ZIRKONIUM PADA KARAKTERISTIK KERNEL YTTRIA-STABILIZED ZIRCONIA (YSZ). Telah dilakukan fabrikasi kernel yttria-stabilized zirconia (YSZ) secara gelasi eksternal dengan memvariasikan metode preparasi broth dan menggunakan dua jenis prekursor zirkonium. Pada preparasi larutan broth, dilakukan penambahan urea yang berfungsi sebagai agen presipitasi homogen untuk menghasilkan larutan sol dan sebagai agen penyedia porositas. Urea berfungsi sebagai agen presipitasi homogen jika ditambahkan pada suhu dekomposisi urea dan berfungsi sebagai agen penyedia porositas jika ditambahkan di bawah suhu dekomposisi. Jumlah urea yang ditambahkan divariasikan untuk mendapatkan nilai rasio mol urea/metal optimum yang ditentukan berdasarkan morfologi kernel tersinter. Prekursor zirkonium yang digunaan adalah zirkonium nitrat pentahidrat dan zirkonium oksinitrat hidrat. Pada penelitian ini, parameter proses pembentukan gel dari broth yang telah disiapkan, aging-washing-drying gel, kalsinasi dan penyinteran tidak divariasi. Karakterisasi produk meliputi pemeriksaan SEM kernel kering dan kernel tersinter untuk memperoleh data morfologi permukaan, pengukuran diameter dan densitas kernel tersinter, dan pemeriksaan XRD untuk penentuan fasa oksida zirkonium-yttrium yang dihasilkan. Berdasarkan pemeriksaan morfologi permukaan kernel tersinter yang dihasilkan, rasio mol urea/metal optimum untuk fungsinya sebagai agen presipitasi pada pereparasi sol adalah 1,0 dengan dekomposisi 80oC sementara rasio mol urea/metal optimum untuk fungsinya sebagai agen penyedia porositas gel adalah 1,5 pada suhu 50oC. Kernel larutan padat Y0,15Zr0,85O1,93 atau 92ZrO2.8Y2O3 diperoleh dari prekursor 16% mol yttrium nitrat dan 84% mol zirkonium nitrat dengan fasa cubic dan densitas 5,5636 gram/cc atau 93,34% densitas teoritis. Kenaikan konsentrasi prekursor menghasilkan kernel dengan diameter lebih besar. Diameter kernel yang mendekati 0,5 mm diperoleh dari broth dengan konsentrasi prekursor 0,855 mol/L yaitu 0,510 mm. Untuk mendapatkan kernel dengan diameter sesuai spesifikasi desain bahan bakar TRISO dapat dilakukan dengan penyesuaian jumlah prekursor dalam umpan atau broth.Kata kunci: kernel YSZ, sol-gel, dekomposisi urea, gelasi eksternal, TRISO, morfologi.
PEMODELAN DAN SIMULASI KINERJA PIN UJI BAHAN BAKAR PWR DENGAN UO2 DIPERKAYA Etty Mutiara; Tri Yulianto; Winter Dewayatna
Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol. 25 No. 3 (2019): Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir
Publisher : Badan Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2019.25.3.5692

Abstract

Modeling and simulation of irradiation of PWR type test fuel of mini pin in RSG GAS reactor has been done using thermomechanics computer code of FEMAXI-6. The simulation was conducted by varying fuel enrichment under irradiation to predict fuel performance. The expected result from the simulation is the availability of simulation data on fuel behavior under simulated irradiation with different enrichment, neutron fluxes along the fuel, length of time and burn-up level at the beginning of contact between fuel pellets and cladding (Pellet-Cladding Mechanical Interaction,PCMI). The simulation data will provide valuable information for real irradiation experiment planning in RSG GAS reactor. The input for the simulation includes geometry and materials and operation condition such as neutron fluxes and linear heat rate. The calculations include heat generated by the fuel, heat transferred out of the fuel, axial and radial distribution of temperatures along the fuel, fission gas release and also pressure generated in fuel pin for whole length of the fuel pin. Temperature distribution calculation from thermal analysis module is applied to detailed mechanical analysis module to calculate gap width between the pellet and the cladding. The simulation shows a trend for reduction of contact time between fuel and cladding with increasing enrichment level at a same reactor power level because higher enrichment will cause higher linear heat rate. While PCMI does not occur on natural uranium fuel even for 100% burnup at full power level, fuel pin containing 5% enriched uranium causes the occurance PCMI at 900 hours of irradiation despite a reduce of power level by half with only 4% burnup.
SIMULASI DIAMETER GEL BASAH PADA FABRIKASI KERNEL YTTRIA-STABILIZED ZIRCONIA MENGGUNAKAN ALAT GEL-CASTING Erilia Yusnitha; Sarjono; Sri Rinanti Susilowati; Winter Dewayatna; Wahyudi Budi Sediawan
Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol. 24 No. 3 (2018): Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir
Publisher : Badan Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2018.24.3.4984

Abstract

In kernel fabrication, microsphere of gelled kernels (yttria-stabilized zirconia) were made by droplet formation of the broth through the gel-casting equipment. Broth is feed of gel-casting equipment that were made of mixed of zirconium (IV) nitrate, yttrium (III) nitrate hexahydrate, urea, tetrahydrofurfuryl alcohol (THFA), and poly vinyl alcohol (PVA). The process parameter of the gel-casting equipment such as vibration frequency and broth flowrate need to be set up to control shape and diameter of the targeted microsphere of gelled kernels. The gel-casting equipment at PTBBN – BATAN is equipped with single nozzle with 1 mm diameter. The simulation work is important to be carried out to reduce the number of experiments in the laboratory hence it reduces the waste from trial and error in the experiment. Moreover, the objective of this simulation work is to predict the diameter of microsphere of gelled kernels. Therefore, the simulation of microsphere of gelled kernel diameter is necessary to be build and verified with the experiment data. According to hypothesis, the simulation of microsphere of gelled kernel diameter can be conducted by considering gel-casting equipment parameter such as the broth flowrate and vibration frequency. In addition, the broth characteristic as broth density affects the diameter of microsphere of gelled kernels diameter. The diameter of microsphere of gelled kernels produced from gel-casting equipment were determined with digital microscope. The result from simulation calculation shows that diameter of microsphere of gelled kernels produced from laboratory experiment can be approached by modified equation involving vibration frequency, broth flowrate, metal concentration in the broth and broth density. It appears that the deviation of simulation calculation is smaller than simple equation, where only vibration frequency and broth flowrate are included in the calculation.
PENGARUH DISTRIBUSI UKURAN SERBUK UO2 PENGAYAAN 2%–5% PADA DENSITAS PELET UO2 Etty Mutiara; Odi Buana Hutapea; Winter Dewayatna; Tri Yulianto
Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol. 27 No. 1 (2021): Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir
Publisher : Badan Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2021.27.1.6333

Abstract

A study of UO2 pellet fabrication using 2%, 3%, 4% and 5% enriched UO2 powder without conditioning has been carried out. There is no published research on the relationship between UO2 powder size distribution and UO2 pellet density in the range of powder sizes studied in this work. Therefore, through this research the influence of size distribution and weight fraction of UO2 powder on various densities was studied to obtain UO2 sintered pellet with a density that meets the requirements as PWR fuel. UO2 pellets were fabricated through cold compaction with variation in pressure of 2, 3 and 4 ton/cm2 and sintering process at 1700 °C for 3 hours. Each UO2 feed powder with its size distribution and weight fraction was directly fabricated into pellets without conditioning.The powder sieving process shows that the 2% and 4% enriched UO2 powders have a monomodal powder size distribution while the 3% and 5% enriched UO2 powders are trimodal size. The green pellets density of 2%, 3%, 4% and 5% enriched UO2 powders are 54.3%TD, 53.19%TD, 52.45%TD and 52.33%TD respectively. The density of sintered pellets from 2% and 5% enriched UO2 powders are 91.13-91.70%TD and 75.33-77.57%TD. The sintered pellets of 3% and 4% enriched UO2 powders were cracked or broken so that the density could not be measured. Based on the pellet density data, it is concluded that the 2% enriched UO2 powders with monomodal size distribution that are dominated by fine powder smaller than 75µm has better compaction capability and sintering ability than other UO2 powders. This research needs to be continued to determine the proper size distribution of the UO2 powder and its weight fraction as compaction process feed in order to obtain higher sintered pellets density that meet the requirements of PWR fuel.
Co-Authors Erilia Yusnitha Etty Mutiara Etty Mutiara, M.Eng Odi Buana Hutapea Sarjono Sarjono Sarjono Sri Rinanti Susilowati Tri Yulianto Wahyudi Budi Sediawan