Analisis Burn Up pada Reaktor Pembiak Cepat Berpendingin Pb-Bi dengan Variasi Fraksi Bahan Bakar dan Bahan Pendingin

Authors

  • Nurkholilah Nurkholilah Jurusan Fisika FMIPA Universitas Andalas
  • Dian Fitriyani Jurusan Fisika FMIPA Universitas Andalas

DOI:

https://doi.org/10.25077/jfu.8.2.184-190.2019

Abstract

Telah dilakukan simulasi pada desain Reaktor Pembiak Cepat Berpendingin Logam Cair (Pb-Bi), menggunakan kode simulasi berbasis bahasa pemograman Delphi 7.0 untuk menganalisis pembiakan bahan fisil 239Pu. Perhitungan diterapkan pada teras reaktor 2-D (dua dimensi) geometri r-z (silinder) dengan menempatkan bahan fertil (blanket) pada teras bagian luar. Teras reaktor dirancang beroperasi pada daya 150 MWt dengan bahan bakar campuran uranium dan plutonium nitrida dan pendingin logam cair Pb-Bi.  Simulasi dilakukan terhadap beberapa variasi fraksi bahan bakar (35%, 40% dan 45%) dan bahan pendingin yang diawali dengan penyelesaian persamaan difusi untuk mendapatkan nilai faktor multiplikasi, fluks neutron dan distribusi daya.  Nilai fluks yang diperoleh digunakan untuk menghitung perubahan densitas atom selama reaktor beroperasi yang diperlukan untuk menganalisis susutan bahan bakar.  Hasil perhitungan menunjukkan bahwa nilai faktor multiplikasi neutron (keff) untuk semua fraksi berada dalam kondisi kritis. Untuk mencapai kondisi kritis diperlukan pengaturan enrichment, pada fraksi bahan bakar yang rendah diperlukan enrichment yang besar dan untuk fraksi bahan bakar yang tinggi diperlukan enrichment yang kecil. Pengaturan enrichment berpengaruh juga pada nilai distribusi fluks neutron, distribusi daya, densitas bahan bakar, breeding ratio dan burn up. Kinerja neutronik yang paling optimal diperoleh pada fraksi bahan bakar 45% dan pendingin 35%. Densitas plutonium tertinggi diperoleh pada fraksi bahan bakar 45% yang merupakan hasil reaksi fisi bahan bakar setelah 1 siklus (4 tahun) operasi. Nilai pertambahan densitas isotop diketahui dari nilai Breeding Ratio (BR) yang besar dari 1.

Kata kunci: breeding ratio, bahan fisil, burn up, reaktor pembiak cepat

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Published

2019-04-01

How to Cite

Nurkholilah, N., & Fitriyani, D. (2019). Analisis Burn Up pada Reaktor Pembiak Cepat Berpendingin Pb-Bi dengan Variasi Fraksi Bahan Bakar dan Bahan Pendingin. Jurnal Fisika Unand, 8(2), 184–190. https://doi.org/10.25077/jfu.8.2.184-190.2019

Issue

Vol. 8 No. 2 (2019)

Section

Articles

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Copyright (c) 2019 Nurkholilah Nurkholilah, Dian Fitriyani

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