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.
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