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

Table 4

Sensitivity analysis results in the axial node number per assembly for case A2.

Parameter	Case A2
Node/assembly	Reference	1 × 18	2 × 18	4 × 18	8 × 18
Critical boron concentration (ppm)	1160.6	1151.8; (−0.76%)	1151.8; (−0.76%)	1151.9; (−0.75%)	1151.9; (−0.75%)
Power peaking factor	2.221	2.237; (0.72%)	2.239; (0.81%)	2.239; (0.81%)	2.239; (0.81%)
Time of power peak, s	0.100	0.099; (−0.001 s)	0.115; (0.015 s)	0.138; (0.038 s)	0.188; (0.088 s)
Power peak	1.071	1.076; (0.47%)	1.076; (0.47%)	1.076; (0.47%)	1.076; (0.47%)
Power at 5 s	1.030	1.032; (0.19%)	1.032; (0.19%)	1.032; (0.19%)	1.033; (0.29%)
Averaged Doppler temperature (at 5 s), °C	553.5	555.7; (0.40%)	556.1; (0.47%)	556.1; (0.47%)	555.8; (0.42%)
Maximum fuel centerline temperature (at 5 s), °C	1733.5	1699.1; (−1.98%)	1703.9; (−1.70%)	1703.4; (−1.74%)	1703.3; (−1.74%)
Coolant outlet temperature (at 5 s), °C	324.5	335.1; (3.27%)	335.1; (3.27%)	335.1; (3.27%)	335.0; (3.24%)