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

Table 2

Sensitivity analysis results in the radial node number per assembly for case C1.

Parameter	Case C1
Node/assembly	Reference	1 × 1	2 × 2	4 × 4
Critical boron concentration (ppm)	1135.3	1146.7; (1.00%)	1133.3; (−0.18%)	1129.5; (−0.51%)
Power peaking factor	2.187	2.176; (−0.50%)	2.188; (0.05%)	2.193; (−0.27%)
Time of power peak, s	0.268	0.258; (0.010 s)	0.265; (−0.003 s)	0.269; (0.001 s)
Power peak	4.773	5.587; (−17.05%)	4.959; (3.90%)	4.685; (−1.84%)
Power at 5 s	0.146	0.144; (−1.37%)	0.142; (−2.74%)	0.142; (−2.74%)
Averaged Doppler temperature (at 5 s), °C	315.9	316.4; (0.16%)	315.9; (0.00%)	315.6; (−0.09%)
Maximum fuel centerline temperature (at 5 s), °C	676.1	686.7; (1.57%)	672.2; (−0.58%)	668.7; (−1.09%)
Coolant outlet temperature (at 5 s), °C	291.5	309.5; (6.17%)	308.9; (5.97%)	308.7; (5.90%)