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PT Sinar Sosro, which was established in 1974, is the first bottled tea drinking company in Indonesia. One of its locations is at Tanjung Morawa, Deli Serdang District. In facing a business competition, the capacity to accommodate internal and external uncertainty in making decision is highly needed. Internal uncertainty in this research was only viewed from the factors of machinery and manpower. External uncertainty was caused by the uncertainty in demand and lead time of delivery which caused the uncertainty in ordering raw materials. Descriptive analysis on Food Supply Chain Networking (FSCN) was done to describe supply chain management. Discussion was concerned with the target of supply chain, supply chain structure, supply chain management, supply chain resources, and the process of supply chain business. The analysis on external uncertainty was done by determining the amount of safety stock, improving the calculation of demand prediction, identifying the interval of ordering, determining the amount of optimum ordering of raw materials by using blanket order system, and conducting simulation of raw material ordering which became the basis for decision making. The analysis on internal uncertainty was done by describing the current condition at PT Sinar Sosro, Tanjung Morawa, Medan.
The research was conducted by focusing on the analysis of the variables which influenced the uncertainty in supply chain. The objective was to decrease the level of uncertainty in supply chain.
The result of the research showed that the safety stock calculation for the botol sosro product was 501,913 at the beginning of 2014. Lead time for delivery was 1.49 months, 1.59 months, and 1.43 months for sugar, tea leaves, and bottle cups respectively. The interval of order for sugar was once in four days for an order of 43,320 kilograms and safety stock of 99,129 kilograms, for tea leaves was once in 12 days for an order of 7,167 kilograms and safety stock of 3,719 kilograms, and for bottle caps was once in eight days for an order of 4,240,800 kilograms and safety stock of 3,463,845 kilograms. Using Blanket Order System and flexible decision to order raw materials could decrease the uncertainty in supply chain management and external uncertainty in particular.
Keywords: Supply Chain Management, Lead Time, Safety Stock, Blanket Order System, Food Supply Chain Networking (FSCN
