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Preliminary Study on Monitoring Radiation Release from Multipurpose Research Reactor GA Siwabessy at Serpong Nuclear Facility Area is performed in order to evaluate the use of Atmospheric Dispersion formula for predicting gamma radiation dose released from a certain nuclear facility to environment during normal operation. The release from reactor were recorded by four radiation monitoring stations available at the distance of 110 m, 135 m, 150 m and 544 m from MPS-GAS Serpong. The purpose of this study is to evaluate the how Gaussian Dispersion Model can describe the recorded gamma radiation coming from Multipurpose Reactor GA Siwabessy which are close to radiation monitoring stations for modelling purpose. The study is started by identifying the strength of source of Argon-41 and Iodine -131, identifying and differentiating measured gross gamma radiation dose rate during operation and shutdown recorded by each monitoring stations using student distribution test or t-test, regression model and compare the result with the Gaussian theoretical model. The study showed that Gaussian Dispersion Model must be modified for short distance prediction by considering building effect surround the nuclear facility. [ABSTRACT FROM AUTHOR]