Science and Technology of Nuclear Installations

Research Article

Interpretation of Local Flux Measurements in Subcritical Systems and Reactivity Determination

Table 3

Performance of gpk and lpk for the prediction of the flux in detectors located at (see positions in Figure 10(b)) during a transient induced by localized perturbations. Values of are computed as relative percentage errors with respect to the corresponding reference values at two different time instants along the transient ( ms and ms).
T1 T2 T3
Exact 1.34 1.49 1.47 1.82 1.17 1.26
gpk [%] −8.88 −9.69 −5.56 −7.13 −2.20 −3.02
lpk [%] −3.75 −1.08 −3.11 −2.58 −0.97 −1.25
exact 1.28 1.42 1.51 1.87 1.17 1.25
gpk [%] −4.30 −5.07 −8.16 −9.59 −1.63 −2.41
lpk [%] −2.40 −2.25 −3.68 −1.07 −0.76 −1.28
exact 1.26 1.41 1.47 1.83 1.22 1.31
gpk [%] −3.14 −4.55 −5.39 −7.89 −5.97 −7.15
lpk [%] −2.39 −2.34 −3.57 −2.17 −2.40 −0.83
exact 1.28 1.42 1.44 1.78 1.16 1.24
gpk [%] −4.53 −5.16 −3.72 −4.97 −1.18 −1.86
lpk [%] −2.37 −2.22 −2.44 −3.67 −0.57 −1.30
exact 1.26 1.40 1.47 1.81 1.16 1.24
gpk [%] −3.16 −3.85 −5.25 −6.56 −0.98 −1.69
lpk [%] −2.01 −2.44 −2.89 −2.90 −0.53 −1.30
exact 1.25 1.40 1.44 1.80 1.18 1.27
gpk [%] −2.19 −3.59 −3.68 −6.17 −2.63 −3.81
lpk [%] −2.06 −2.48 −3.07 −3.11 −1.32 −1.21
exact 1.22 1.34 1.37 1.65 1.13 1.20
gpk [%] 0.01 0.46 1.75 2.41 1.38 1.48
lpk [%] −0.55 −2.88 −0.33 −6.13 0.47 −1.34
exact 1.25 1.38 1.43 1.76 1.15 1.23
gpk [%] −1.76 −2.31 −2.71 −3.80 −0.087 −0.69
lpk [%] −1.51 −2.63 −2.13 −4.18 −0.21 −1.32
exact 1.24 1.38 1.41 1.76 1.16 1.24
gpk [%] −0.96 −2.50 −1.49 −4.26 −0.60 −1.89
lpk [%] −1.71 −2.62 −2.53 −4.01 −0.68 −1.31
exact 1.33 1.48 1.48 1.83 1.18 1.26
gpk [%] −8.17 −9.03 −6.01 −7.67 −2.43 −3.30
lpk [%] −3.61 −1.30 −3.28 −2.28 −1.06 −1.23
exact 1.29 1.43 1.51 1.86 1.17 1.25
gpk [%] −5.06 −5.87 −7.87 −9.37 −1.88 −2.69
lpk [%] −2.66 −2.10 −3.66 −1.22 −0.86 −1.26
exact 1.27 1.42 1.48 1.86 1.18 1.27
gpk [%] −3.74 −5.43 −5.98 −8.94 −2.85 −4.27
lpk [%] −2.72 −2.19 −3.95 −1.52 −1.49 −1.17