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Uranium and plutonium intermediate spectrum critical homogeneous systems
(U-MI , Pu-MI/CRITISP)

5.01) U-MI-AEEWHECTOR

Uranium enriched to 92.3 atom% in U-235 intermediate spectrum critical homogeneous system

This benchmark is an assembly were the central region experiment is modeled as one
infinite homogeneous critical mixture of U-Graphite-boron.

Material U mixture
(92.3 a% enrichment)
Mixture Isotopic Concentration
(atoms/barn.cm3)		 H : 1.126E-04
B-nat : 2.907E-04
C-nat : 7.565E-02
O : 1.630E-03
U-234: 3.120E-06
U-235: 2.502E-04
U-236: 4.267E-07
U-238: 1.719E-05
Temperature (K) 293.0
Experimental buckling
(1/cm2)		 0.0

References

[1] FOX, W.N., KING, D.C., PITCHER, H.H.W., SANDLER, J.E., Reactor Physics
Measurements on 235 U and 239 Pu Fuels in An Intermediate Spectrum Assembly
Journal of British Nuclear Energy Society, 1970, Volume 9, pp 15-27 (1970).

[2] NUCLEAR DATA AGENCY, K EXPERIMENTS IN INTERMEDIATE NEUTRON
SPECTRA FOR 235U, NEA/NSC/D OC(95)03/II, Volume II, HEU-COMP-INTER-004,
Nuclear Science Committee, International Handbook of Evaluated Criticality Safety
Benchmark Experiments, September 2001 Edition, Nuclear Energy Agency,
OECD (2001).
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5.02) PuMI-AEEW HECTOR

Plutonium intermediate spectrum critical homogeneous system

This benchmark is an assembly were the central region experiment is modeled as
one infinite homogeneous critical mixture of Pu-Graphite-boron.

Material Pu mixture
Mixture Isotopic Concentration
(atoms/barn.cm3)		 H : 1.077E-04
B-nat : 5.101E-04
C-nat : 7.090E-02
O : 2.707E-03
Pu-239: 2.735E-04
Pu-240: 1.549E-05
Pu-241: 1.072E-06
Pu-242: 5.800E-08
Temperature (K) 293.0
Experimental buckling
(1/cm2) 		0.0

References

[1] FOX, W.N., KING, D.C., PITCHER, H.H.W., SANDLER, J.E., Reactor Physics
Measurements on 235 U and 239 Pu Fuels in An Intermediate Spectrum Assembly
Journal of British Nuclear Energy Society, 1970, Volume 9, pp 15-27 (1970).

[2] NUCLEAR ENERGY AGENCY,K EXPERIMENTS IN INTERMEDIATE NEUTRON
SPECTRA FOR 239PU, NEA/NSC/DOC(95)03/I, Volume I, PU-COMP-INTER-001,
Nuclear Science Committee, International Handbook of Evaluated Criticality Safety
Benchmark Experiments, September 2 001 Edition, Nuclear Energy Agency,
OECD (2001).

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