A new strategy for validating transient neutronic solver using the measurement data during the dynamic rod worth measurement process

A new strategy was proposed in this study to validate the transient neutronic solver. This new strategy features in employing the measurement data of the ex-core detector signals and reactivity worth from the dynamic rod worth measurement (DRWM). Meanwhile, the control-rod movement during the DRWM is simulated explicitly by the transient neutronic solver based on the time-dependent neutron diffusion equation and the response function. By comparing the simulated results with measurement data, this strategy can strongly guarantee the accuracy and reliability of the transient neutronic solver in engineering applications. Additionally, different from the limited transient benchmarks and transient facilities, this new strategy has sufficient measurement data for transient validation benefiting from the widely applied DRWM technique in PWRs across the world. The application of such a new strategy has been demonstrated based on the CNP1000 reactor operated in China. The ex-core detector signals and reactivity worth with respect to each individual control rod were studied and provided. Good agreements have been achieved between measurement and simulation. This newly proposed strategy can be a feasible and reliable approach to validate the transient neutronic solver.