Headworks of reservoirs were constructed in different periods, so many dams have not fully met the requirements for: design documents, design methods, construction techniques and maintenance work of the construction system. Therefore, the safety level of works is often lower than the current regulations and standards, and many dams have failed as well as potential risks of unsafety of the reservoir. If earth dams are broken, it will cause flooding and great loss of life and property to the downstream area, so the upgrading and repair of headworks of reservoirs in combination with improving the capacity of dam safety management should be improved. Currently, the upgrading and repair of headworks is calculated by the deterministic method and have met the technical and economic requirements, but there is not much quantitative relationship with flood risk of the downstream areas. Therefore, the decision to choose the option to upgrade and repair the system is highly effective and ensures the required reliability according to the acceptable risk level of the downstream area, the study introduces how to choose the optimal option when upgrading the focal system of the reservoir, the theory of reliability and risk analysis. Apply the calculation results to choose the option when upgrading the Cam Ranh reservoir head system in Khanh Hoa province to meet ICOLD's flood prevention standards and design additional spillways according to the required reliability.
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