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DTRA’s advancements in nuclear and radiological detection
A new, more complex nuclear age has begun. Echoing the tensions of the Cold War amid rapidly evolving nuclear and radiological threats, preparedness in the modern age is a contest of scientific innovation. The Research and Development Directorate (RD) at the Defense Threat Reduction Agency (DTRA) is charged with winning this contest.
Yuehang Li, Donghao He, Xiaojing Liu, Qingquan Pan
Nuclear Science and Engineering | Volume 200 | Number 5 | May 2026 | Pages 1118-1135
Research Article | doi.org/10.1080/00295639.2025.2510708
Articles are hosted by Taylor and Francis Online.
The Transient Fission Matrix Combination (TFMC) method is a novel hybrid algorithm that performs transient neutron transport calculations with high fidelity and computational efficiency. In this paper, we verify the TFMC method using the control rod insertion/withdrawal C5G7-TD benchmark. The TD4 test case involves five complex control rod movement patterns in a four-assembly light water reactor model. On 20 parallel cores, each 16-s transient simulation completes in approximately 2 min (excluding database generation time). The computed total power and power distributions agree closely with reference results in all cases. These findings demonstrate the TFMC method’s potential as an efficient and accurate tool for transient neutron transport simulations.