TISKTH-3是一部中子学与热工水力学耦合的堆芯瞬态分析程序。程序的中子学部分采用节块格林函数法求解三维中子动力学方程;流体动力学部分采用包含完整的沸腾曲线的均匀平衡模型,并且有隐式和显式两种数值解法,燃料模型采用权重留数法求解二维变导热系数的导热方程。因此,程序TISKTH-3具有分析堆芯快速瞬变和复杂事故工况的能力。初步使用表明:程序的计算稳定性好、收敛快。 TISKTH-3 is a neutron-thermal-hydraulically coupled core transient analysis program. The neutron part of the program uses the nodal Green’s function method to solve the three-dimensional neutron kinetic equation. The hydrodynamics part adopts a uniform equilibrium model with a complete boiling curve, and implicit and explicit numerical methods are adopted. The fuel model uses Weight Residue Method for Solving Thermal Equation of Two - dimensional Variable Thermal Conductivity. Therefore, program TISKTH-3 has the ability to analyze core fast transients and complex accident conditions. Initial use shows that: the calculation of the program is stable and fast convergence.