As the first fast reactor in China, the first criticality of CEFR (China Experimental Fast Reactor) was successfully achieved on 21st July 2010. The first criticality test of CEFR consists of two processes: the fuel loading for net core and the criticality process. In this paper, some detailed information about this test is introduced, including methods, procedures, results, etc. The test results are compared with the theoretical analysis. Comparison shows that the test results match the theoretical analysis very well, which demonstrates that the codes utilized for theoretical analysis are capable of the basic calculation of CEFR.

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