In Situ Measurement of Neutron Multiplication in Active Zone Components of Pole Shaped Critical Assembly

In order to verify the effectiveness of the safety margin preset for the empty-handed assembly in the design of active zone for the pole shaped critical assembly,the conservative experiment model is es-tablished to carry out the in situ measurement of neutron multiplication.By adding components of fission system one by one,the multiplication in this experiment is measured as 2.67,which is under the limit in GB15146.7-94.The experiment shows that the safety margin of active zone preset in the design is enough,and the critical safety can be insured in the empty-handed assembling.