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A fission product release analysis code, called LPROF-BATAN, is being developed as part of acquiring the design and safety analysis capability of a pebble bed reactor. A triso-based fueled which applied in pebble bed reactor design assures a very limited fission product release to the environment below the hazardous limit. A specific analysis code is needed to performed quantitative analysis of the fission product which released from the pebble fuel, contained in the primary system, and finally release to environment. This paper presents the development LPROF-BATAN for the fission product release from the pebble fuel and contained in the primary system of the reactor. Comparison of forward Euler, backward Euler and Crank-Nicolson method in solving the initial value problem model of the fission product release is given in this paper. Comparison of LPROF-BATAN results to the available report of HTR-10 reactor design shows a good agreement.