Figure 1.
Problem I, sub-critical configuration, direct (a) and adjoint (b) fundamental distributions according to the α-(blue) and k-(red) eigenvalue formulations, with (squares) and without (circles) delayed contributions.
Figure 1.
Problem I, sub-critical configuration, direct (a) and adjoint (b) fundamental distributions according to the α-(blue) and k-(red) eigenvalue formulations, with (squares) and without (circles) delayed contributions.
Figure 2.
Problem I, sub-critical configuration, direct (a) and adjoint (b) fundamental distributions according to the α-(blue) and k-(red) eigenvalue formulations, with (squares) and without (circles) delayed contributions.
Figure 2.
Problem I, sub-critical configuration, direct (a) and adjoint (b) fundamental distributions according to the α-(blue) and k-(red) eigenvalue formulations, with (squares) and without (circles) delayed contributions.
Figure 3.
Problem I, ratios / of the direct fundamental distributions, for sub-critical (a) and super-critical (b) configuration, with (red squares) and without (blue circles) delayed contributions.
Figure 3.
Problem I, ratios / of the direct fundamental distributions, for sub-critical (a) and super-critical (b) configuration, with (red squares) and without (blue circles) delayed contributions.
Figure 4.
Problem I, ratios / of the adjoint fundamental distributions, for sub-critical (a) and super-critical (b) configuration, with (red squares) and without (blue circles) delayed contributions.
Figure 4.
Problem I, ratios / of the adjoint fundamental distributions, for sub-critical (a) and super-critical (b) configuration, with (red squares) and without (blue circles) delayed contributions.
Figure 5.
Problem III, sub-critical configuration, direct (a) and adjoint (b) fundamental distributions according to the α- (blue) and k- (red) eigenvalue formulations, with (squares) and without (circles) delayed contributions.
Figure 5.
Problem III, sub-critical configuration, direct (a) and adjoint (b) fundamental distributions according to the α- (blue) and k- (red) eigenvalue formulations, with (squares) and without (circles) delayed contributions.
Figure 6.
Problem III, super-critical configuration, direct (a) and adjoint (b) fundamental distributions according to the α- (blue) and k- (red) eigenvalue formulations, with (squares) and without (circles) delayed contributions.
Figure 6.
Problem III, super-critical configuration, direct (a) and adjoint (b) fundamental distributions according to the α- (blue) and k- (red) eigenvalue formulations, with (squares) and without (circles) delayed contributions.
Figure 7.
Problem III, ratios / of the direct fundamental distributions, for sub-critical (a) and super-critical (b) configuration, with (red squares) and without (blue circles) delayed contributions.
Figure 7.
Problem III, ratios / of the direct fundamental distributions, for sub-critical (a) and super-critical (b) configuration, with (red squares) and without (blue circles) delayed contributions.
Figure 8.
Problem III, ratios / of the adjoint fundamental distributions, for sub-critical (a) and super-critical (b) configuration, with (red squares) and without (blue circles) delayed contributions.
Figure 8.
Problem III, ratios / of the adjoint fundamental distributions, for sub-critical (a) and super-critical (b) configuration, with (red squares) and without (blue circles) delayed contributions.
Figure 9.
Radial section of the CROCUS reactor obtained with TRIPOLI-4
®. The inner fuel rods (UO
2, orange) and the outer fuel rods (metallic U, green) are moderated by light water (blue). The red regions denotes the 14 fuel rod positions defined for the flux distribution [
15].
Figure 9.
Radial section of the CROCUS reactor obtained with TRIPOLI-4
®. The inner fuel rods (UO
2, orange) and the outer fuel rods (metallic U, green) are moderated by light water (blue). The red regions denotes the 14 fuel rod positions defined for the flux distribution [
15].
Figure 10.
Direct fundamental eigenmodes of the CROCUS reactor as a function of the energy, H1 (a) and H2 (b) configurations according to the α- (blue) and k- (red) eigenvalue formulations, with (squares) and without (circles) precursor contributions.
Figure 10.
Direct fundamental eigenmodes of the CROCUS reactor as a function of the energy, H1 (a) and H2 (b) configurations according to the α- (blue) and k- (red) eigenvalue formulations, with (squares) and without (circles) precursor contributions.
Figure 11.
Direct fundamental eigenmodes of the CROCUS reactor as a function of the fuel pin positions, H1 (a) and H2 (b) configurations according to the α- (blue) and k- (red) eigenvalue formulations, with (squares) and without (circles) precursor contributions.
Figure 11.
Direct fundamental eigenmodes of the CROCUS reactor as a function of the fuel pin positions, H1 (a) and H2 (b) configurations according to the α- (blue) and k- (red) eigenvalue formulations, with (squares) and without (circles) precursor contributions.
Figure 12.
Adjoint fundamental eigenmodes of the CROCUS reactor as a function of the fuel pin positions, H1 (a) and H2 (b) configurations according to the α- (blue) and k- (red) eigenvalue formulations, with (squares) and without (circles) precursor contributions.
Figure 12.
Adjoint fundamental eigenmodes of the CROCUS reactor as a function of the fuel pin positions, H1 (a) and H2 (b) configurations according to the α- (blue) and k- (red) eigenvalue formulations, with (squares) and without (circles) precursor contributions.
Figure 13.
Ratios / of the CROCUS reactor as a function of the energy variable, H1 (a) and H2 (b) configurations with (red squares) and without (blue circles) precursor contributions.
Figure 13.
Ratios / of the CROCUS reactor as a function of the energy variable, H1 (a) and H2 (b) configurations with (red squares) and without (blue circles) precursor contributions.
Figure 14.
Ratios / of the CROCUS reactor as a function of the fuel pin positions, H1 (a) and H2 (b) configurations with (red squares) and without (blue circles) precursor contributions.
Figure 14.
Ratios / of the CROCUS reactor as a function of the fuel pin positions, H1 (a) and H2 (b) configurations with (red squares) and without (blue circles) precursor contributions.
Figure 15.
Ratios / of the CROCUS reactor as a function of the fuel pin positions, H1 (a) and H2 (b) configurations with (red squares) and without (blue circles) precursor contributions.
Figure 15.
Ratios / of the CROCUS reactor as a function of the fuel pin positions, H1 (a) and H2 (b) configurations with (red squares) and without (blue circles) precursor contributions.
Table 1.
Uranium densities for benchmark configurations. Uranium isotopic mass fractions and water properties are equal to those described in the reference [
12].
Table 1.
Uranium densities for benchmark configurations. Uranium isotopic mass fractions and water properties are equal to those described in the reference [
12].
Configuration | ρU [g/cm3] |
---|
I sub-critical | 18.6836 |
I super-critical | 18.9085 |
III sub-critical | 13.5676 |
III super-critical | 13.8600 |
Table 2.
Numerical simulation parameters for benchmark configurations: forward simulations.
Table 2.
Numerical simulation parameters for benchmark configurations: forward simulations.
Configuration | Active Cycles | Inactive Cycles | Particles |
---|
I sub-critical | 5 × 103 | 103 | 105 |
I super-critical | 5 × 103 | 103 | 105 |
III sub-critical | 2 × 103 | 2 × 103 | 104 |
III super-critical | 2 × 103 (*) | 2 × 103 | 104 |
Table 3.
Numerical simulation parameters for benchmark configurations: adjoint simulations.
Table 3.
Numerical simulation parameters for benchmark configurations: adjoint simulations.
Configuration | Particles | Latent Generations |
---|
I sub-critical | 5 × 107 | 20 |
I super-critical | 5 × 107 | 20 |
III sub-critical | 5 × 109 | 5 |
III super-critical | 5 × 109 | 5 |
Table 4.
Fundamental eigenvalues k0 for Problem I.
Table 4.
Fundamental eigenvalues k0 for Problem I.
Configuration | k0 [–], with Delayed Contributions | k0 [–], Prompt Fission Only |
---|
I sub-critical | 0.99396 ± 5 × 10−5 | 0.98750 ± 4 × 10−5 |
I super-critical | 1.00389 ± 6 × 10−5 | 0.99740 ± 6 × 10−5 |
Table 5.
Fundamental eigenvalues α0 for Problem I.
Table 5.
Fundamental eigenvalues α0 for Problem I.
Configuration | α0 [s–1], Including Precursors | α0 [s–1], without Precursors |
I sub-critical | −1.1880 × 10−2 ± 2 × 10−6 | −1.379 × 106 ± 1 × 103 |
I super-critical | 3.025 × 10−1 ± 3 × 10−4 | −4.339 × 105 ± 4 × 102 |
Table 6.
Fundamental eigenvalues k0 for Problem III.
Table 6.
Fundamental eigenvalues k0 for Problem III.
Configuration | k0 [–], with Delayed Contributions | k0 [–], Prompt Fission Only |
---|
III sub-critical | 0.9927 ± 2 × 10−4 | 0.9858 ± 2 × 10−4 |
III super-critical | 1.0050 ± 2 × 10−4 | 0.9979 ± 2 × 10−4 |
Table 7.
Fundamental eigenvalues α0 for Problem III.
Table 7.
Fundamental eigenvalues α0 for Problem III.
Configuration | α0 [s–1], Including Precursors | α0 [s–1], without Precursors |
---|
III sub-critical | −1.1686 × 10−2 ± 7 × 10−6 | −9.820 × 102 ± 9 × 10−1 |
III super-critical | 4.71 × 10−1 ± 1 × 10−3 | −1.945 × 102 ± 4 × 10−1 |
Table 8.
Effective kinetics parameters of Problem I, sub-critical configuration including delayed contributions.
Table 8.
Effective kinetics parameters of Problem I, sub-critical configuration including delayed contributions.
Parameters | | |
---|
ρ [pcm] | −669 ± 5 | −608 ± 6 |
Λeff [ns] | 5.773 ± 0.003 | 5.728 ± 0.002 |
βeff [pcm] | 644 ± 2 | 645 ± 2 |
[pcm] | 23.5 ± 0.1 | 23.5 ± 0.4 |
[pcm] | 90 ± 0.6 | 90.9 ± 0.8 |
[pcm] | 66.8 ± 2 | 66.4 ± 0.7 |
[pcm] | 128.7 ± 0.9 | 128 ± 1 |
[pcm] | 198 ± 1 | 200 ± 1 |
[pcm] | 63.2 ± 0.7 | 63.1 ± 0.7 |
[pcm] | 58 ± 0.7 | 56.2 ± 0.6 |
[pcm] | 15.9 ± 0.4 | 16.6 ± 0.3 |
Table 9.
Effective kinetics parameters of Problem I, sub-critical configuration without delayed contributions.
Table 9.
Effective kinetics parameters of Problem I, sub-critical configuration without delayed contributions.
Parameters | | |
---|
ρ [pcm] | −6289 ± 50 | −1266 ± 4 |
Λeff [ns] | 45.6 ± 0.3 | 5.728 ± 0.002 |
Table 10.
Effective kinetics parameters of Problem I, super-critical configuration including delayed contributions.
Table 10.
Effective kinetics parameters of Problem I, super-critical configuration including delayed contributions.
Parameters | | |
---|
ρ [pcm] | 409 ± 9 | 388 ± 6 |
Λeff [ns] | 5.654 ± 0.002 | 5.675 ± 0.002 |
βeff [pcm] | 643 ± 5 | 644 ± 2 |
[pcm] | 20 ± 2 | 23.8 ± 0.4 |
[pcm] | 93 ± 3 | 91.1 ± 0.8 |
[pcm] | 68 ± 2 | 65.5 ± 0.7 |
[pcm] | 125 ± 2 | 128.3 ± 0.9 |
[pcm] | 201 ± 2 | 200 ± 1 |
[pcm] | 61.4 ± 0.8 | 60.9 ± 0.7 |
[pcm] | 57.6 ± 0.7 | 57 ± 0.6 |
[pcm] | 17.1 ± 0.4 | 16.9 ± 0.3 |
Table 11.
Effective kinetics parameters of Problem I, super-critical configuration without delayed contributions.
Table 11.
Effective kinetics parameters of Problem I, super-critical configuration without delayed contributions.
Parameters | | |
---|
ρ [pcm] | −247.2 ± 0.4 | −261 ± 6 |
Λeff [ns] | 5.698 ± 0.002 | 5.677 ± 0.002 |
Table 12.
Effective kinetics parameters of Problem III, sub-critical configuration including delayed contributions.
Table 12.
Effective kinetics parameters of Problem III, sub-critical configuration including delayed contributions.
Parameters | | |
---|
ρ [pcm] | −582 ± 10 | −735 ± 20 |
Λeff [μs] | 12.62 ± 0.05 | 12.71 ± 0.05 |
βeff [pcm] | 704 ± 7 | 706 ± 7 |
[pcm] | 25.4 ± 0.4 | 24 ± 1 |
[pcm] | 97 ± 2 | 97 ± 2 |
[pcm] | 74 ± 3 | 72 ± 2 |
[pcm] | 134 ± 3 | 144 ± 3 |
[pcm] | 223 ± 5 | 223 ± 4 |
[pcm] | 70 ± 2 | 65 ± 2 |
[pcm] | 63 ± 2 | 63 ± 2 |
[pcm] | 19 ± 1 | 18 ± 1 |
Table 13.
Effective kinetics parameters of Problem III, sub-critical configuration without delayed contributions.
Table 13.
Effective kinetics parameters of Problem III, sub-critical configuration without delayed contributions.
Parameters | | |
---|
ρ [pcm] | −1658 ± 7 | −1437 ± 20 |
Λeff [μs] | 16.88 ± 0.06 | 12.79 ± 0.05 |
Table 14.
Effective kinetics parameters of Problem III, super-critical configuration including delayed contributions.
Table 14.
Effective kinetics parameters of Problem III, super-critical configuration including delayed contributions.
Parameters | | |
---|
ρ [pcm] | 478 ± 40 | 496 ± 20 |
Λeff [μs] | 12.16 ± 0.04 | 12.21 ± 0.04 |
βeff [pcm] | 681 ± 20 | 711 ± 7 |
[pcm] | 22 ± 7 | 28 ± 1 |
[pcm] | 97 ± 10 | 97 ± 2 |
[pcm] | 77 ± 8 | 73 ± 2 |
[pcm] | 132 ± 6 | 138 ± 3 |
[pcm] | 215 ± 6 | 232 ± 4 |
[pcm] | 65 ± 3 | 62 ± 2 |
[pcm] | 61 ± 2 | 62 ± 2 |
[pcm] | 18 ± 1 | 20 ± 1 |
Table 15.
Effective kinetics parameters of Problem III, super-critical configuration without delayed contributions.
Table 15.
Effective kinetics parameters of Problem III, super-critical configuration without delayed contributions.
Parameters | | |
---|
ρ [pcm] | −252 ± 1 | −213 ± 20 |
Λeff [μs] | 12.93 ± 0.05 | 12.29 ± 0.05 |
Table 16.
Numerical simulation parameters for CROCUS configurations during forward simulations.
Table 16.
Numerical simulation parameters for CROCUS configurations during forward simulations.
Configuration | Active Cycles | Inactive Cycles | Particles |
---|
H1 | 5 × 103 | 5 × 103 | 2 × 104 |
H2 | 5 × 103 | 5 × 103 | 2 × 104 |
Table 17.
Numerical simulation parameters for CROCUS configurations during adjoint simulations.
Table 17.
Numerical simulation parameters for CROCUS configurations during adjoint simulations.
Configuration | Particles | Latent Generations |
---|
H1 | 2 × 107 | 20 |
H2 | 2 × 107 | 20 |
Table 18.
Fundamental eigenvalues k0 for H1 and H2 configurations of the CROCUS reactor.
Table 18.
Fundamental eigenvalues k0 for H1 and H2 configurations of the CROCUS reactor.
Configuration | k0 [–], with Delayed Contributions | k0 [–], Prompt Fission Only |
---|
H1 | 0.9995 ± 1 × 10−4 | 0.9918 ± 1 × 10−4 |
H2 | 0.9919 ± 1 × 10−4 | 0.9839 ± 1 × 10−4 |
Table 19.
Fundamental eigenvalues α0 for H1 and H2 configurations of the CROCUS reactor.
Table 19.
Fundamental eigenvalues α0 for H1 and H2 configurations of the CROCUS reactor.
Configuration | α0 [s–1], Including Precursors | α0 [s–1], without Precursors |
---|
H1 | −5.97 × 10−3 ± 2 × 10−5 | −1.711 × 102 ± 2 × 10−1 |
H2 | −1.1994 × 10−2 ± 3 × 10−6 | −3.336 × 102 ± 2 × 10−1 |
Table 20.
Effective kinetics parameters for the H1 configuration including delayed contributions.
Table 20.
Effective kinetics parameters for the H1 configuration including delayed contributions.
Parameters | | |
---|
ρ [pcm] | −73 ± 2 | −50 ± 10 |
Λeff [μs] | 47.69 ± 0.03 | 47.69 ± 0.03 |
βeff [pcm] | 762 ± 4 | 760 ± 5 |
[pcm] | 22.3 ± 0.6 | 23.4 ± 0.8 |
[pcm] | 109 ± 2 | 113 ± 2 |
[pcm] | 66 ± 1 | 62 ± 1 |
[pcm] | 141 ± 2 | 141 ± 2 |
[pcm] | 249 ± 3 | 245 ± 3 |
[pcm] | 81 ± 2 | 83 ± 2 |
[pcm] | 68 ± 1 | 67 ± 1 |
[pcm] | 26.5 ± 0.8 | 26 ± 0.8 |
Table 21.
Effective kinetics parameters for the H1 configuration without delayed contributions.
Table 21.
Effective kinetics parameters for the H1 configuration without delayed contributions.
Parameters | | |
---|
ρ [pcm] | −824 ± 1 | −827± 10 |
Λeff [μs] | 48.15 ± 0.03 | 48.11 ± 0.03 |
Table 22.
Effective kinetics parameters for the H2 configuration including delayed contributions.
Table 22.
Effective kinetics parameters for the H2 configuration including delayed contributions.
Parameters | | |
---|
ρ [pcm] | −723 ± 10 | −822 ± 10 |
Λeff [μs] | 48.06 ± 0.03 | 48.01 ± 0.03 |
βeff [pcm] | 763 ± 5 | 766 ± 5 |
[pcm] | 23.2 ± 0.2 | 22.2 ± 0.7 |
[pcm] | 113 ± 2 | 113 ± 2 |
[pcm] | 64 ± 1 | 66 ± 1 |
[pcm] | 140 ± 2 | 143 ± 2 |
[pcm] | 247 ± 3 | 251 ± 3 |
[pcm] | 82 ± 2 | 82 ± 2 |
[pcm] | 68 ± 2 | 66 ± 1 |
[pcm] | 24.8 ± 0.9 | 24 ± 0.8 |
Table 23.
Effective kinetics parameters for the H2 configuration without delayed contributions.
Table 23.
Effective kinetics parameters for the H2 configuration without delayed contributions.
Parameters | | |
---|
ρ [pcm] | −1621 ± 2 | −1638 ± 10 |
Λeff [μs] | 48.59 ± 0.03 | 48.39 ± 0.03 |