Calculation on reliability of combining the distribution line of the multi purpose reactor G.A. Siwabessy electrical systems

In the RSG-GAS electrical systems, distribution lines was supplied from three primary distribution panel, they are busbar BHA, busbar BHB, and busbar BHC that are working independently. All three busbar are supplied by only one source of power supply through a single PLN. Each busbar supplies the redundant load. By procedure it is recognized that failure one of the three busbar causing failure of the reactor operation. This weakness can be resolved by modifying the busbar configuration that is by combining them using the power cable so that the primary distribution panel will change its nature be ''three in one'' complementary. Such changes will be a new configuration with different levels of reliability than that of the present busbar configuration. This paper calculates the reliability of both busbar configurations installed and modified busbar configuration. Calculation was carried out using reliability formulas and the electrical equipment failure rate parameters that support the busbar configuration. By calculation result gives that the reliability of the primary distribution panel installed is 0.9728807076, and reliability of the modified distribution panel is 0.9996537791. In other words there are increases in the reliability of the primary distribution panel by 2.75 %. (author)