scholarly journals EVALUASI DAN PERKEMBANGAN PEMBUATAN BAHAN BAKAR KERNEL UO2 DI PTAPB-BATAN YOGYAKARTA

2007 ◽  
Vol 10 (1) ◽  
Author(s):  
Hidayati Hidayati ◽  
Sri Rinanti Susilowati ◽  
Didiek Herhady
Keyword(s):  
High Temperature ◽  
National Laboratory ◽  
Sol Gel ◽  
Oak Ridge ◽  
Oak Ridge National Laboratory ◽  
High Temperature Reactor

EVALUASI DAN PERKEMBANGAN PEMBUATAN BAHAN BAKAR KERNEL UO2 DI PTAPBBATANYOGYAKARTA Telah dilakukan evaluasi pembuatan bahan bakar kernel UO2 sertaperkembangannya di Bidang Kimia dan Teknologi Proses Bahan (BKTPB) – PTAPB - BATAN Yogyakarta.Pembuatan kernel UO2 telah dilakukan dengan metode gelasi internal maupun eksternal. Metode gelasiinternal dilakukan dengan cara kombinasi proses KEMA-HKFA (Keuringvan Electrotecnische Materialenat Arnhem-Hkernforchungsanlage) maupun dengan proses ORNL (Oak Ridge National Laboratory),sedangkan metode gelasi eksternal dilakukan dengan proses emulsifikasi NUKEM (Nuclear Chemie undMetalurgie Gmbh). Dengan metode gelasi internal, telah dilakukan berbagai optimasi kondisi prosesnya.Hasil sementara menunjukkan bahwa proses yang paling baik adalah proses ORNL menggunakan mediagelasi TCE (tricloro etilena). Dengan metode gelasi eksternal, telah diperoleh beberapa kondisi optimum,namun masih perlu dilakukan optimasi lebih lanjut. Untuk memilih metode gelasi internal atau eksternaltergantung pada kemudahan proses, murah secara ekonomi serta yang memberikan hasil terbaik.Pemilihan metode belum bisa diputuskan karena belum semua variabel proses dioptimasi. Penelitianmengenai pelapisan kernel UO2 menggunakan silikon karbida (SiC) maupun pirokarbon (PyC) barumerupakan tahap awal, sehingga masih diperlukan optimasi berbagai variabel prosesnya. Penelitianpembuatan kernel UO2 di BKTPB – BATAN Yogyakarta direncanakan untuk pembuatan inti elemen bakarbentuk bola untuk HTR (High Temperature Reactor) dan dikembangkan sebagai bahan awal prosespembuatan pelet (proses SGMP = Sol-Gel Microsphere Pelletization) untuk PHWR (Pressurized HeavyWater Reactor).

scholarly journals Experimental studies in high temperature aqueous chemistry at Oak Ridge National Laboratory

1997 ◽  
Vol 69 (5) ◽  
pp. 905-914 ◽  
Author(s):  
R. E. Mesmer ◽  
D. A. Palmer ◽  
J. M. Simonson ◽  
H. F. Holmes ◽  
P. C. Ho ◽  
...  
Keyword(s):  
High Temperature ◽  
National Laboratory ◽  
Experimental Studies ◽  
Aqueous Chemistry ◽  
Oak Ridge ◽  
Oak Ridge National Laboratory

scholarly journals CONTINUOUS ENERGY COMET SOLUTION TO A SMALL MODULAR ADVANCED HIGH-TEMPERATURE REACTOR BENCHMARK PROBLEM (SmAHTR)

2021 ◽  
Vol 247 ◽  
pp. 05002
Author(s):  
Farzad Rahnema ◽  
Dingkang Zhang
Keyword(s):  
Monte Carlo ◽  
High Temperature ◽  
National Laboratory ◽  
Benchmark Problems ◽  
High Fidelity ◽  
Oak Ridge ◽  
Continuous Energy ◽  
High Temperature Reactor ◽  
Relative Differences ◽  
High Computational Efficiency

The continuous energy coarse mesh transport (COMET) method is a hybrid stochasticdeterministic solver that provides transport solutions to heterogeneous reactor cores. In this paper, COMET is tested against continuous energy Monte Carlo in solving the recently developed stylized Small Modular Advanced High-Temperature Reactor (SmAHTR) Benchmark Problems based on the Oak Ridge National Laboratory pre-conceptual design (core configurations). These problems are well-suited to test the performance of advanced neutronics tools because of their unique neutronics characteristics such as the multiple heterogeneities. The COMET solutions for the three benchmark problems were found to agree very well with the continuous energy Monte Carlo reference solutions. The discrepancy in the core eigenvalue (k-eff) varied from 40 pcm to 51 pcm. The average and maximum relative differences in the pin fission densities were in the range of 0.20% to 0.21% and 0.77% to 0.94%, respectively. It was also found that COMET was more than 2,000 times fast than MCNP. It can be concluded that COMET can model the SmAHTR core configuration with high fidelity and significantly high computational efficiency.

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