Abstract:
From 26 th June, 2013 to 14 th June, 2017, dozens of criticality experiments were conducted on MJTR, and the experiment results show that the critical position of control rod are rising. To this phenomenon, some analysis and calculation have been done, and the results show that this phenomenon is a result of several elements such as fission products decay, temperature effect and the reducing of fissile nuclide. This conclusion is of great importance to the safe operation of MJTR in the future.