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Criticality risk lies in the nuclear facilities and transport packaging since significant quantities of fissile materials are implemented during operations of manufacture, storage, transport or reprocessing. Prevention of this risk first relies on the evaluation of the under-criticality margins of any equipment containing fissile material in casual and accidental conditions. Within this framework, the purpose of the computer codes for qualification (or experimental validation) is to determine skews of calculations associated with a particular configuration.

The qualification relies on the comparison between computation results and experimental values. The variations observed are interpreted and then transposed to the real configurations to study. Thus, the experimental base used for the qualification of the computer codes, must be the most representative of all the situations met during the fuel cycle.

Qualification base Design

Experiments retained for the qualification base result from a methodical analysis of available benchmarks in the literature. The main criteria is to select representative experiments. Indeed, the goal is to obtain a very extent qualification base covering a maximum fuel cycle configurations. Thus, influence of various parameters such as the isotopic composition, the moderation ratio, the heart geometry, the presence or not of various types of reflectors or various poisons will be studied,... Experiments to qualify specificities of a material or a precise nuclide could also be retained.



The table below presents the experiments retained for CRISTAL V1 qualification and sums up the V1 CRISTAL calculation chain qualification state.

Assessment of CRISTAL V1 qualification
MEDIUMS CATEGORY A number of experiments selected for D1 A number of treated experiments
TRIPOLI4 APOLLO2-MORET 4 APOLLO2-Sn
SOLUTIONS 1 LEU-SOL-THERM
(Slightly enriched uranium)
76 60 73 33
2 HEU-SOL-THERM
(Strongly enriched uranium)
167 70 140 156
3 PU-SOL-THERM
(Plutonium)
189 96 161 125
4 MIX-SOL-THERM
(Mixte U+Pu)
52 39 52 32
    TOTAL SOLUTIONS 484 265 426 346
INTERACTIONS 5 LEU-SOL-THERM
(INTERACTION)
9 9 9 0
6 HEU-SOL-THERM
(INTERACTION)
49 49 49 0
7 PU-SOL-THERM
(INTERACTION)
102 59 102 0
8 MIX-MET-MIXED
(INTERACTION)
1 0 0 1
9 MIX-COMP-THERM
(INTERACTION)
49 0 49 0
10 HEU-MET-FAST
(INTERACTION)
35 31 31 10
11 HEU-MET-MIXED
(INTERACTION)
2 0 0 2
12 PU-MET-FAST
(INTERACTION)
32 32 32 0
    TOTAL INTERACTION 279 163 272 13
U233 13 U233-MET-FAST 1 0 1 1
14 U233-SOL-INTER 6 0 6 0
15 U233-SOL-THERM 36 5 36 0
    TOTAL U233 43 6 43 0
POWDERS 16 HEU-COMP-MIXED
(POWDERS)
26 26 26 0
17 HEU-COMP-INTER
(POWDERS)
7 0 0 7
18 LEU-COMP-THERM
(POWDERS)
91 51 91 52
19 PU-COMP-MIXED
(POWDERS)
34 34 34 0
20 MIX-COMP-THERM
(POWDERS)
33 33 33 33
    TOTAL POWDERS 191 144 184 92
FUEL LATTICE 21 LEU-COMP-THERM
(LATTICE)
527 37 459 179
22 IEU-COMP-THERM 2 2 2 0
23 MIX-COMP-THERM 229 59 205 60
24 HEU-COMP-THERM 9 0 9 9
25 HEU-MET-THERM 83 63 78 23
26 HEU-MET-FAST 43 43 43 0
27 LEU-MET-THERM 31 0 31 0
28 PU-MET-FAST 3 0 0 3
    TOTAL FUEL LATTICE 927 204 827 279
DISSOLVERS 29 MIX-MISC-THERM
(DISSOLVERS)
73 12 73 0
30 LEU-MISC-THERM
(DISSOLVERS)
8 2 8 6
    TOTAL DISSOLVERS 81 14 81 6
METAL 31 HEU-MET-FAST 51 28 33 41
32 HEU-MET-MIXED 2 2 2 2
33 HEU-MET-INTER 4 0 3 4
34 IEU-MET-FAST 11 5 5 11
35 PU-MET-FAST 27 18 21 27
36 MIXED-MET-FAST 33 5 28 33
37 SPEC-MET-FAST 1 1 1 0
    TOTAL METAL 129 59 93 118
    TOTAL 2134 855 1926 854

Update on May, the 20th of 2005.


  

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CRISTAL V0 qualification


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