Based On The Go Methodology Of Chinese Experimental Fast Reactor Nuclear Island Power System Reliability Analysis

System reliability analysis is the important content and base of Probabilistic Safety Assessment(PSA). By evaluating the reliability of the important safety system of the reactor, It can evaluate the designing performance of the system, suportative devices, failure mode and the unavailability of the system to offer direct reference and basis for impoving and optimizing devices. Moreover, system reliability analysis is also the important part of one level PSA.Now, Fault Tree Analysis(FTA), Reliability Board Drawing(RBD) and Failure Mode and Effective Analysis (FMEA) are the popular methods for the system analysis, but some of them are only suitable for the simple system and others are only capable of analyzing the reliability of steady-state and one-function-state. The GO methodology is a useful system reliability analysis method. It can analyze the reliability of the multi-state, related-time, complicate systems. Carring out the reliability analysis of the power supply system of China Experimental Fast Reactor(CEFR) by the aid of GO methodology can go over the disadvantages of the other methods such as FT A and can evaluate the multi-state and repairable systems.This paper, firstly, introdues the principle and the analyzing process of GO methodology, Then, on the babsis of the GO theory, the imput-output calculation formula of the operators which are suitable for the reliability analysis of the power supply systems is constructed and the caculation models of dynamic and steady-state analysis are developed. With these models, a computer software for the quantitative calculation is programmed and the reliability analysis of the CEFR power supply sub-systems is finished. Then the dydmanic analysis is practised for the plant-used bus and emergency bus. The results show that the probability of the lost of both plant-used bus is 5.37E-06 and the probability of the lost of emergency AC 380V bus is 3.35E-07. The probability of DC 220V bus is 2.73E-05 and the probability of the bus supplying power the protecting system and the safe monitoring device is 5.92E-06. The result also shows that the falure probability of the power bus for nuclear-level heating system is 3.57E-05.This paper not only acquires the quantitative assecessment of reliability for the power supply systems of CEFR, but also gives some good advice for improving design, and at the same time, the results is inputed to the work of the one level PSA of CEFR.This paper achieved the convincing results by the advanced reliability analysis methods, which shows that the GO methodology is a useful system reliability analysis method for the analysis multi-state, time-related and repairable system such as the power supply system of the reactors.Finally, this paper comes up with the devolopent idea of GO metheodology's theoryand thinks that the better popular software should be programmed by the designers' advantage if GO metheodology is further developed.