NODAL3 Sensitivity Analysis for NEACRP 3D LWR Core Transient Benchmark (PWR)

Table 1

Sensitivity analysis results in radial node number per assembly for case A1.

Parameters	Case A1
Node/assembly	Reference	1 × 1	2 × 2	4 × 4	8 × 8
Critical boron concentration (ppm)	567.7	569.6; (0.33%)	563.1; (−0.81%)	561.6; (−1.07%)	561.4; (−1.11%)
Power peaking factor	2.857	2.815; (−1.47%)	2.866; (0.32%)	2.877; (0.70%)	2.878; (0.74%)
Time of power peak, s	0.560	0.828; (0.268 s)	0.566; (0.006 s)	0.537; (−0.023 s)	0.530; (−0.030 s)
Power peak	1.180	0.554; (−53.05%)	1.172; (−0.68%)	1.315; (11.44%)	1.332; (12.88%)
Power at 5 s	0.196	0.181; (−7.65%)	0.188; (−4.08%)	0.188; (−4.08%)	0.190; (−3.06%)
Averaged Doppler temperature (at 5 s), °C	324.3	320.7; (−1.11%)	323.3; (−0.31%)	323.5; (−0.25%)	323.9; (−0.12%)
Maximum fuel centerline temperature (at 5 s), °C	673.3	620.1; (−7.90%)	659.5; (−2.05%)	665.4; (−1.17%)	666.4; (−1.02%)
Coolant outlet temperature (at 5 s), °C	293.1	306.7; (4.64%)	308.7; (5.32%)	308.9; (5.39%)	309.1; (5.46%)