ABSTRACT

Simulation of HTTR fuel rod burnup had been performed using MVP-BURN. HTTR was using prismatic block fuel consist of  UO2  coated by TRISO with 6% enrichment. Graphite was used for moderator and reflector material. Reactor thermal power had been set constantly at 30 MW. Burnup had been set from 1,000 MWd/t to 35,000 MWd/t and divided in to 8 burnup steps.  The purpose of this simulation was to determine the activity of 134Cs, 137Cs, 154Eu and its linearity toward burnup. The activity of 134Cs, 137Cs, and 154Eu obtained from this simulation were (5.871 ± 0.012) 1014 Bq, (7.319 ± 0.014) 1014 Bq, and (1.8242 ± 0.0036) 1013 Bq respectively. The trend of 134Cs and 154Eu were formed as quadratic function towards burnup. The linearity trend occurred in 137Cs so this nuclide was recommended to be used for burnup parameter.

Keywords: HTTR, burnup, 134Cs, 137Cs, 154Eu.

ABSTRAK

Telah dilakukan simulasi burnup reaktor jenis HTTR dengan bagian yang disimulasikan yaitu fuel rod menggunakan MVP BURN. Bahan bakar HTTR berbentuk prismatic block berisi kernel UO2 dilapisi TRISO dengan pengayaan 6%. Moderator dan reflektor bermaterial grafit. Reaktor diasumsikan beroperasi pada daya konstan yaitu 30 MW. Burnup dilakukan dari 1.000 MWd/t sampai dengan 35.000 MWd/t dengan pembagian sebanyak 8 burnup step. Simulasi ini ditujukan untuk menentukan aktivitas hasil fisi yaitu 134Cs, 137Cs, dan 154Eu serta melihat kecenderungan dan linearitasnya terhadap nilai burnup. Nilai aktivitas 134Cs, 137Cs, dan 154Eu yang diperoleh dari simulasi ini secara berturut-turut adalah (5,871 ± 0,012)×1014 Bq, (7,319 ± 0,014)×1014 Bq, dan (1,8242 ± 0,0036)×1013 Bq. Nuklida 134Cs dan 154Eu menunjukan kecenderungan fungsi kuadratik terhadap burnup. Linearitas terjadi pada nuklida 137Cs sehingga nuklida ini dapat direkomendasikan sebagai parameter burnup.

Kata Kunci: HTTR, burnup, 134Cs, 137Cs, 154Eu.

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