A New Precursor Integral Method for Solving Space-Dependent Kinetic Equations in Neutronic and Thermal-Hydraulic Coupling System

Table 5

TWIGL relative power transient reference problem ramp reactivity insertion at 50 ms.

	Independent variables	Zero-order Taylor expansion	First-order Taylor expansion	Exponential expansion
0.1	1.124625	1.124624 (−8.89e − 5)	1.124624 (−8.89e − 5)	1.124624 (−8.89e − 5)
1	1.124676	1.124571 (−4.80e − 3)	1.124583 (−3.73e − 3)	1.124683 (−3.73e − 3)
10	1.125223	1.124158 (−4.15e − 2)	1.124174 (−4.01e − 2)	1.124179 (−3.96e − 2)
50	1.128223	1.121703 (−2.59e − 1)	1.121963 (−2.36e − 2)	1.121985 (−2.34e − 2)