Analysis of NEA-NSC PWR Uncontrolled Control Rod Withdrawal at Zero Power Benchmark Cases with NODAL3 Code

Table 9

Effect of axial nodes number per FA for transient hot pellet results in Cases A, B, and D.

Parameters	Results	Reference	NODAL3 (node number for a axial layer per FA)
			1 × 18	2 × 18	4 × 18	8 × 18
Case A
Maximum fuel temperature at hot pellet centerline, °C	D6	631.8	632.9 (0.17%)	632.3 (0.08%)	633.0 (0.19%)	633.0 (0.19%)
Case B
Maximum fuel temperature at hot pellet centerline, °C	D6	478.2	460.9 (3.62%)	474.7 (0.73%)	472.4 (1.21%)	472.9 (1.11%)
Case D
Maximum fuel temperature at hot pellet centerline, °C	B1	451.4	457.8 (1.42%)	446.8 (1.02%)	448.8 (0.58%)	450.0 (0.31%)

Note. The radial node number is 2 × 2 nodes; number in parentheses are the absolute value of relative deviation of NODAL3 with the reference.