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

Table 5

Sensitivity analysis results in the axial node number per assembly for case B2.

Parameter	Case B2
Node/assembly	Reference	1 × 18	2 × 18	4 × 18	8 × 18
Critical boron concentration (ppm)	1189.4	1179.2; (−0.86%)	1179.1; (−0.87%)	1179.2; (−0.86%)	1179.2; (−0.86%)
Power peaking factor	2.109	2.122; (0.62%)	2.121; (0.57%)	2.121; (0.57%)	2.121; (0.57%)
Time of power peak, s	0.120	0.131; (0.011 s)	0.143; (0.023 s)	0.159; (0.039 s)	0.194; (0.074 s)
Power peak	1.063	1.055; (−0.75%)	1.057; (−0.56%)	1.057; (−0.56%)	1.057; (−0.56%)
Power at 5 s	1.038	1.033; (−0.48%)	1.034; (−0.39%)	1.034; (−0.39%)	1.034; (−0.39%)
Averaged Doppler temperature (at 5 s), °C	552.0	552.6; (0.11%)	552.8; (0.14%)	552.9; (0.16%)	552.9; (0.16%)
Maximum fuel centerline temperature (at 5 s), °C	1588.1	1598.1; (0.63%)	1598.2; (0.64%)	1598.0; (0.62%)	1598.2; (0.64%)
Coolant outlet temperature (at 5 s), °C	324.5	334.6; (3.11%)	334.6; (3.11%)	334.6; (3.11%)	334.6; (3.11%)