Interpretation of Local Flux Measurements in Subcritical Systems and Reactivity Determination

Table 2

Performance of gpk and lpk for the prediction of the system power during a transient induced by localized perturbations. Values of Δ𝑃 are computed as relative percentage errors with respect to the corresponding reference values at two different time instants along the transient (𝑡₁=1ms and 𝑡₂=10ms).

		T1		T2		T3
		𝑡1	𝑡2	𝑡1	𝑡2	𝑡1	𝑡2
Exact		1.25	1.38	1.42	1.76	1.15	1.23
Δ gpk [%]		−1.68	−2.61	−2.35	−4.08	−0.44	−1.32
	𝑑11	3.86	6.67	0.18	0.62	0.81	0.48
	𝑑12	0.27	0.28	2.42	4.95	0.44	−0.17
	𝑑13	−0.92	−0.35	−0.47	1.88	3.33	5.40
	𝑑21	0.54	0.41	−1.05	−2.77	0.17	−0.76
	𝑑22	−0.51	−1.19	0.09	−0.32	0.01	−0.93
Δ lpk [%]	𝑑23	−1.55	−1.49	−1.74	−0.96	0.89	1.35
	𝑑31	−2.23	−5.85	−4.34	−12.09	−1.33	−4.06
	𝑑32	−1.42	−2.93	−1.76	−4.47	−0.57	−1.95
	𝑑33	−2.42	−2.72	−3.38	−3.83	−0.53	−0.73
	𝑑41	3.21	5.67	0.49	1.52	0.95	0.78
	𝑑42	0.80	1.28	2.11	4.54	0.59	0.12
	𝑑43	−0.64	0.73	−0.24	3.73	0.95	1.87