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A new method for the measurement of sample reactivity worth in a fast neutronreactor named the inverse kinetics method is proposed in the paper. The samplereactivity worth could be obtained by measuring the reactivity step change inthe process of sample fetching and placing in the delayed critical reactor.Compared with the traditional period method, the advantage is that the accuracyof reactor reactivity control will not exert any influence on the uncertaintyof reactivity worth measurement. The inverse kinetics method has been used tomeasure the reactivity worth of {\phi}20mmx9mm Au, V and Be samples at thecenter of the upper surface of a highly enriched uranium fast neutron reactor,and the results are 5.17, 4.40 and 5.90 respectively, which are consistent withthose obtained with the period method. The standard uncertainty of measurementof the results is about 0.03, which achieves an obvious improvement comparedwith that (~0.08) of the period method.

Investigations of reactivity worth measurement in a fast neutron reactor with the inverse kinetics method