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Reactivity measurement is an essential part of a zero-power physics test,which is critical to reactor design and development. The rod drop experimentaltechnique is used to measure the control rod worth in a zero-power physicstest. The conventional rod drop experimental technique is limited by thespatial effect and the difference between the calculated static reactivity andmeasured dynamic reactivity; thus, the method must be improved. In this study,a modified rod drop experimental technique that constrains the detector neutronflux shape function based on three-dimensional space-time dynamics to reducethe reactivity perturbation and a new method for calculating the detectorneutron flux shape function are proposed. Correction factors were determinedusing Monte Carlo N-Particle transport code and transient analysis code for apressurized water reactor at the Ulsan National Institute of Science andTechnology and Xi'an Jiaotong University, and a large reactivity of over 2000pcm was measured using the modified technique. This research evaluated themodified technique accuracy, studied the influence of the correction factors onthe modification, and investigated the effect of constraining the shapefunction on the reactivity perturbation reduction caused by the differencebetween the calculated neutron flux and true value, using the new method tocalculate the shape function of the detector neutron flux and avoiding theneutron detector response function (weighting factor) calculation.

First Application of Large Reactivity Measurement through Rod Drop Based on Three-Dimensional Space-Time Dynamics