基于源项展开法的瞬态多群精细功率重构研究

This paper studies the calculation method of transient multi-group pin-power reconstruction of PWR. Starting from the transient fixed-source equation, the transient fixed-source term is expressed in the form of biquadratic Legendre polynomial, and the pin-power reconstruction is realized through the iterative solution of the whole reactor. The method is applied to the core physics code SPARK, and the TWIGL transient benchmark task is used to verify the accuracy of transient multi-group pin-power reconstruction. Numerical results show that the PWR transient multi-group pin-power reconstruction method proposed in this paper has high computational accuracy.