Crtical heat flux (CHF) is an important characteristic of nanofluids. The CHF measurements were carried out in nanofluid research at the Center for Applied Nuclear Science and Technology. These measurements are done manually using a variable power supply and a multimeter. However, it was difficult to record the voltage and current due to the sudden break of the wire. In this study, Arduino was used to measure CHF automatically. The voltage is applied to the wire and increases automatically along with the measurement of the voltage and current in the wire. The results of the voltage and current measurements were compared with a multimeter and were not significantly different. It can be concluded that the CHF measurement system using arduino can be used to measure nanofluid CHF.
ABSTRAK.RANCANGAN TANGKI TUNDA REAKTOR TRIGA PELAT BANDUNG. Mengingat elemen bakar TRIGA tidak diproduksi lagi oleh produsen aslinya General Atomic, maka perlu diusahakan suatu solusi agar reaktor TRIGA 2000 tetap dapat beroperasi. PSTNT bersama satker-satker lain di BATAN melakukan terobosan baru dengan mengusulkan konversi bahan bakar standard TRIGA ke elemen bakar tipe pelat yang saat ini sudah diproduksi di dalam negeri. Salah satu yang harus mendapatkan perhatian dalam konversi reaktor TRIGA 2000 ke reaktor TRIGA Pelat adalah naiknya paparan radiasi Nitrogen-16 ( 16 N) di permukaan tangki reaktor, karena mengganti moda pendinginan teras reaktor menjadi konveksi paksa. Oleh karena itu perlu dirancang sistem tunda yang ditempatkan pada sistem primer, untuk menunda aliran air pendingin dengan kandungan 16 N keluar dari tangki reaktor hingga paparan radiasi 16 N yang keluar dari tangki reaktor menjadi 1000 mikroSv/jam. Sistem tunda ini diantaranya dapat berupa tangki tunda. Hasil penelitian dengan menggunakan paket program Fluent dan Gambit, diketahui tangki tunda tiga buffle dapat menunda selama 50 detik aliran air pendingin keluar tangki reaktor, untuk meluruhkan 16 N selama 7 kali peluruhan. Pada makalah ini disampaikan hasil kajian rancangan tangki tunda tiga buffle untuk digunakan pada sistem tunda reaktor TRIGA Pelat sebagai reaktor TRIGA 2000 Bandung yang dikonversi. Kata kunci:Reaktor TRIGA Pelat, konversi, elemen bakar tipe pelat, 16 N, tangki tunda ABSTRACT. DELAY TANK DESIGN OF BANDUNG TRIGA PLATE REACTOR.Due to no further production of TRIGA fuel elements by the fuel manufacturer of General Atomic, it is necessary to find a solution so that the TRIGA 2000 reactor can still operate. CANST with other work units in NNEA make a new breakthrough by proposing the conversion of standard TRIGA fuel to the fuel element of plate type which currently has been produced domestically. One of the concerns in the TRIGA 2000 reactor conversion activity is the rising exposure of 16 N radiation in the surface of the reactor tank, since replacing the reactor core cooling modes into forced convection. Therefore it is necessary to design a delay system that is placed on the primary system, to delay the flow of cooling water with 16 N content coming out of the reactor tank until exposure to 16 N radiation coming out of the reactor tank to 1000 microSv/hour. This delay system can be in the form of a delay tank. The results of the study using the Fluent and Gambit program package, it is known that the three bufle delay tank can delay for 50 seconds the flow of cooling water out of the reactor tank to shed 16 N for 7 times. In this paper the results of the study of the delay tank design which has three buffles to be used on the delay system of the TRIGA Plate reactor as the Bandung TRIGA 2000 reactor being converted.
THE ASSESSMENT OF BANDUNG TRIGA REACTOR TANK RADIOACTIVITY USING ORIGEN-2.In accordance with the regulation of the Nuclear Energy Regulatory Agency of Indonesia related to the decommissioning of nuclear reactors, the management of the Bandung TRIGA reactor have to prepare a decommissioning plan document of the Bandung TRIGA research reactor. Decommissioning program documents shall be regularly updated every five years of the operation of nuclear reactor. In year 2000, Bandung TRIGA reactor tank have been lined using aluminum alloy 6061-T6 and has activated during reactor operation. The aluminum alloy 6061-T6 contains impurities that can produce high radioactivity and has a long half-life. This paper describes the radioactivity of the reactor tank after activation during the period from 2000 to 2014 using a software ORIGEN-2. Total radioactivity of the reactor tank bottom after decay for 5 years was 1.83 10 -7 Curie, while the total radioactivity of reactor tank wall was 3.2 10 -3 Curie.Keywords: radioactivity, reactor tank, ORIGEN-2, decay. Curie, sedangkan radioaktivitas total dinding tangki reaktor adalah 3,2 10 -3 Curie.. ABSTRAKKata kunci: radioaktivitas, tangki reaktor, ORIGEN-2, peluruhan.
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