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Journal > Jurnal Pengembangan Energi Nuklir > ANALISIS SENSITIVITAS KETEBALAN REFLEKTOR GRAFIT TERAS RGTT200K MENGGUNAKAN PERHITUNGAN MONTE CARLO

 

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Jurnal Pengembangan Energi Nuklir
Vol 16, No 2 (2014): Desember 2014
ANALISIS SENSITIVITAS KETEBALAN REFLEKTOR GRAFIT TERAS RGTT200K MENGGUNAKAN PERHITUNGAN MONTE CARLO
Article Info   ABSTRACT
Published date:
14 Dec 2014
 
ABSTRAK ANALISIS SENSITIVITAS KETEBALAN REFLEKTOR GRAFIT TERAS RGTT200K MENGGUNAKAN PERHITUNGAN MONTE CARLO. Salah satu parameter desain reaktor pebble-bed yang sangat penting selain radius, pengayaan dan densitas bahan bakar adalah ketebalan reflektor. Reflektor aksial dan radial dalam reaktor temperatur tinggi digunakan untuk meningkatkan ekonomi neutron, namun dimensi reflektor harus diinvestigasi khususnya untuk teras pebble-bed dengan opsi bahan bakar yang berbeda. Makalah ini secara esensial bertujuan mencari tebal efektif reflektor aksial dan radial yang direkomendasikan untuk teras RGTT200K. Analisis ditekankan pada perilaku neutron dalam bahan bakar bola dimana partikel TRISO disusun dengan kisi SC dalam matriks grafit dan perilaku teras yang disusun oleh bahan bakar pebble dalam kisi BCC. Perhitungan teras dengan tiga opsi bahan bakar, yakni UO2, PuO2 dan ThO2/UO2 pada berbagai fraksi packing TRISO dikerjakan dengan program transport Monte Carlo MCNPX dan pustaka data tampang lintang energi neutron kontinu ENDF/B-VI. Hasil perhitungan memperlihatkan perubahan reaktivitas teras RGTT200K karena fraksi packing TRISO tidak secara langsung menyebabkan ketebalan reflektor radial bertambah. Penambahan ketebalan reflektor radial setelah mencapai 100 cm tidak memberikan perubahan yang berarti terhadap reaktivitas teras RGTT200K. Penambahan ketebalan reflektor aksial juga tidak mempunyai dampak yang berarti pada perubahan reaktivitas teras RGTT200K. Dari analisis dapat disimpulkan bahwa, tebal efektif reflektor radial dan aksial bagian atas dan bawah dicapai masing-masing pada ketebalan 100 cm. Kata kunci: RGTT200K, sensisitivitas, reflektor radial, reflektor aksial, MCNPX, ENDF/B-VI. ABSTRACT ANALYSIS ON THICKNESS SENSITIVITY OF GRAPHITE REFLECTOR FOR RGTT200K CORE USING MONTE CARLO CALCULATION. One of very important parameter in design of the pebble bed reactor beside radius, enrichment and density of fuel are reflector thickness. Axial and radial reflectors in high temperature reactor are used to improve the neutron economy, however the reflector dimension has to be investigated especially for pebble bed core with various fuel options. This paper essentially aimed to look for the thickness of radial and axial reflectors to obtain specific design recommended for RGTT200K core. The analysis focused on the neutron behavior in fuel pebble where TRISO particles arranged with SC lattice in the graphite matrix and the core behavior composed by the fuel pebble in the BCC lattice arrangement. The core calculation with three fuel options of UO2, PuO2 and ThO2/UO2 at various TRISO packing fractions were employed using MCNPX Monte Carlo transport code and continuous neutron energy cross-section ENDF/B-VI file. The calculation results show that, the RGTT200K core reactivity change because of TRISO packing fraction is not directly cause the increasing of radial reflector thickness. The adding of radial reflector thickness after achieving 100 cm does not give the effective effect on the RGTT200K core reactivity change. The increasing of axial reflector thickness has no significant impact on RGTT200K core reactivity change. From the analysis, it can be concluded that the effective thickness of radial reflector and top and bottom axial reflectors are achieved at a thickness of 100 cm. Keywords: RGTT200K, sensitivity, radial reflector, axial reflector, MCNPX, ENDF/B-VI.
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