IL SISTEMA DI CALCOLO
MODULARE
ERANOS
(EUROPEAN REACTOR
ANALYSIS OPTIMIZED SYSTEM)
(Dr. Vincenzo Peluso – ENEA)
1
1. INTRODUCTION
• ERANOS 2.1 is a system of neutron and gamma codes developed
within a European framework.
• This system meets the needs expressed by the industrialists and
the teams working on the design of fast reactors, present and future.
• It allows moreover, with the use of the convivial LU user’s language,
to perform programs of R&D in reactor physics without
systematically needing specific developments.
2
2. ERANOS FUNCTIONS
•
Fast reactor core, shielding, and fuel cycle calculations can be performed with the
ERANOS system. ERANOS is a deterministic code system, so neutron physics
calculations are performed at the cell/lattice level and at the core level.
•
The cell/lattice code ECCO (European Cell COde) is fed by libraries that are in a
direct access format in various energy meshes: 1968 groups (all-purpose), 175
groups (shielding purposes), the 172-group XMAS scheme (refined in the low
energy range), and 33 groups (energy mesh generally used for core calculations).
•
Four sets of libraries can be used:
JEF-2.2 obtained directly from JEF2.2 evaluations
ERALIB1 obtained from the JEF-2.2 libraries by a statistical fitting on integral
experiments
JEFF-3.1 obtained directly from JEFF3.1 evaluations
ENDFB-VI.8 obtained directly from ENDFB-VI.8 evaluations.
N.B.: The Code HETAIRE and the library CARNAVAL4 of the old Fast Neutron C.E.A. code
system are also available in ERANOS 2.1. For neutron shielding and gamma propagation
and heating applications, the PROPANE and VASCO libraries are also available.
3
2. ERANOS FUNCTIONS
•
The ECCO code solves the resonant nuclide self-shielding using the sub-group
method and computing, with a collision probability method, a fine-group solution of
the transport integral equation. The cross-sections can be condensed and
homogenized.
•
ECCO can model the following geometries:
Plane,
Cylindrical,
2D rectangular sub-assembly with or without wrapper,
2D hexagonal sub-assembly with or without wrapper,
3D slab geometry, useful to model platelet fuel.
•
The core calculations carried out by ERANOS include reactivity, flux, spatial power
distribution, reactivity coefficients, burnup, and control rod worth. Moreover, for very
different applications (analysis of experiments, reactivity coefficients, follow-up and
management of core loadings), traditional, generalized and harmonics perturbation
modules are available.
4
2. ERANOS FUNCTIONS
•
The ERANOS code system is a very open system, modular, whose objects (SET or
EDL) are easy to handle by many modules and the LU user language.
This makes possible, using the various available modules, to create procedures for
specific types of applications, e.g. to define separately design and reference
calculations schemes for respectively scoping and detailed calculations.
•
Calculations performed by ERANOS are gathered according to the following
chapters:
Operating Conditions
Internal Transfer of nuclear data
Release of energy and damage to the structures
Diffusion modules 1D, 2D (XY , RZ and Hexagonal),
3D Hexagonal Z
Sn transport modules 1D, 2D (XY and RZ )
Nodal diffusion and transport modules P1, P3, P5, SP3, SP5 (XY, XYZ,
Hexagonal and Hexagonal Z)
Perturbation modules
Burn-up modules
5
3. The ALOS system
What’s ALOS ?
•The ALOS software provides a complete development environment.
•It includes :
-a programming language => ESOPE
-basic data structures => the SEGMENTs the EDLs (or SETs )
-an utility library to manage memory =>GEMAT
-a user command language =>LU
-an archiving utility =>ARCHIVE
-a relational data base management system => SGBD
6
3.1 LU language
LU is the user language for all software developed under ALOS.
It allows:
•To handle the variables(integers, reals, strings of characters, pointers…)
and the SETs
•To call up a program(ESOPE, standard FORTRAN, C, …)
•To perform numericaland logical calculationsusing basic mathematical
functions : SIN, COS, LOG, EXP …
•To make advanced programmingusing loops (POUR, TANTQUE) or
conditional execution structures (SI … SINONSI … SINON … FINSI)
•To encapsulate complex sequenceof instructions in macro instructions
called PROCEDURE
•To use archiving utilitiesand the internal relational SGBD
7
3.2 Basic LU
Each term of a LU instruction may be one of the following types:
-numeric constant ==>
-text constant
==>
-keywords
==>
-result variable
==>
-input variable
==>
-expression
==>
10 -5 1.25789E-05
'Martin‘ 'A= ' "Resultat"
ITERATIONS_EXTERNES
->X -> SIGMA
(X) (SIGMA)
(X+1) (SIGMA*SIGMA)
•A LU instruction can stand on several lines
•The last instruction of a LU program is FIN ;
8
3.2 Basic LU
Each term of a LU instruction may be one of the following types:
-numeric constant ==>
-text constant
==>
-keywords
==>
-result variable
==>
-input variable
==>
-expression
==>
10 -5 1.25789E-05
'Martin‘ 'A= ' "Resultat"
ITERATIONS_EXTERNES
->X -> SIGMA
(X) (SIGMA)
(X+1) (SIGMA*SIGMA)
•A LU instruction can stand on several lines
•The last instruction of a LU program is FIN ;
9
3.2 Basic LU
• A LU instruction endswith;
• Only 80 first characters are valid on a line
• A string of characters must not increase more than 500 characters
• The text that follows an exclamation mark (!) is ignored
(a line that begins with ! is a comment)
• Lower cases and upper cases are equivalentexcept in text variable
• Tabulations are prohibited
10
3.3 Arithmetic and logical calculation
•Basic operators:
+ for the addition
- for the subtraction
/ for the division
* for the multiplication
** for the power
• Comparison operators:
= equal
< lesser than
> greater than
/= different from
<= lesser or equal
>= greater or equal
•Logical operators :
ET AND
OU OR
NON NOT
11
3.3 Arithmetic and logical calculation
•
We also use the functions :
SIN COS TAN ASIN ATAN ACOS EXP LOG LOG10
ABSENT MOD
MAXMIN SOMME PRODUIT TRI
•
The sequence :
->TAB 7 2 5 4 3 6 1 ;
->SUM SOMME (TAB);
->PROD PRODUIT (TAB);
->I TRI(TAB) ;
->J TAB(TRI(TAB)) ;
provides
->SUM 28
->PROD 5040
->I 7 2 5 4 3 6 1
->J 1 2 3 4 5 6 7
12
3.4 Others functions
•
REP operator
The sequence
->A REP(6);
->B REP(-6);
->C REP(3,'toto') ;
is similar to
->A 1 2 3 4 5 6 ;
->B 6 5 4 3 2 1 ;
->C 'toto‘ ‘toto’‘toto’;
13
3.5 The printing utility
•
Printing a variable with the * operator
->T 1 4 2.E-02 78;
* T;
provides
* 2 T;
provides
* -1 T;
provides
->T 1 4 2.00000E-02 78
->T 1
4
2.00000E-02 78
->T
(1) 1
(2) 4
(3) 2.00000E-02
(4) 78
14
3.6 Utilities
•
Remove a variable
/ X;
•
Remove an EDL
/ (EDL_MACRO);
•
Duplication of a variable and a SET
= -> Y X; ! the variable X is duplicated under a new
! Reference Y
= ->NEW_EDL (EDL_MACRO) ; ! the set pointed by the variable
! MACRO_SET isduplicated
15
3.7 The POUR (FOR) loop
•
This structure can be used only in a procedure
Syntax:
->CONTROL_ROD_POSITION 0. 100. 200. 400.;
POUR->IP 1 2 3 4;
GEOMETRY_MODIFICATION-> NEW_GEOMETRY_SET
GEOMETRY(GEOMETRY_SET)
CORE(CORE_SET)
MEDIUM(MEDIUM_SET)
NEW_Z_AXIS
POSITION 19 18 (CONTROL_ROD_POSITION(IP))
POSITION 23 19 (CONTROL_ROD_POSITION(IP))
POSITION 13 23 (CONTROL_ROD_POSITION(IP));
...
FLUX_CALCULATION-> NEW_FLUX_SET ->EIGENVALUE
NEW_GEOMETRY_SET ;
/ (NEW_GEOMETRY_SET) (NEW_FLUX_SET);
FINPOUR;
The instructions between POUR and FINPOUR will be executed 4 times.
The variable IP successively takes the values 1, 2, 3 and 4.
16
3.8 The TANTQUE (WHILST) loop
•
This structure can be used only in a procedure
->Z_AXIS 0 100. 200. 400. ;
->IP 1 ;
TANTQUE (IP <= Z_AXIS() ) ;
GEOMETRY_MODIFICATION ->NEW_GEOMETRY_SET
GEOMETRY(GEOMETRIE_SET)
CORE(CORE_SET)
MEDIUM(MEDIUM_SET)
NEW_Z_AXIS
POSITION 1918 (Z_AXIS(IP))
POSITION 2319 (Z_AXIS(IP))
POSITION 1823 (Z_AXIS(IP));
...
FLUX_CALCULATION ->NEW_FLUX_SET
>EIGENVALUE
NEW_GEOMETRY_SET
NEW_MACRO_SET;
/ (NEW_GEOMETRY_SET) (NEW_FLUX_SET);
->IP (IP+1) ;
FINTANTQUE ;
17
3.9 Conditional Conditional execution execution
The SI (IF) structure
•
This structure can be used only in a procedure
SI (GEOMETRY_TYPE=‘XY’) ;
! XY case
XY_GEOMETRY_CREATION ->EDL_GEOMETRY
….. ;
SINONSI (GEOMETRY_TYPE=‘H2D’) ; ! H2D case
H2D_GEOMETRY_CREATION ->EDL_GEOMETRY
….. ;
SINONSI (GEOMETRY_TYPE=‘RZ’) ; ! RZ case
RZ_GEOMETRY_CREATION ->EDL_GEOMETRY
….. ;
SINONSI (GEOMETRY_TYPE=‘XYZ’) ; ! XYZ case
XYZ_GEOMETRY_CREATION ->EDL_GEOMETRY
….. ;
SINON ;
! H3D case
FINSI;
18
3.10 The PROCEDURES
•
A procedure allows to encapsulate a sequence of LU instructions
•
A procedure is similar to a function
•
A procedure is a particular SET (SET of type 'PROCEDURE V1')
•
A procedure may be store on a permanent file (ARCHIVE file)
􀂄Structure of a procedure:
PROCEDURE->procedure_name
input1 input2 ….inputn
->output1 …. ->outputn;
....
Sequence of LU instructions
....
FINPROC;
Input and output arguments can be listedin the order you want
19
3.10 The PROCEDURES
• Example (a way to create an EDL_MACRO with micro cross sections)
PROCEDURE->CREATE_MACRO_SAMPLE
EDL_MICRO EDL_MILIEU
->EDL_MACRO_SAMPLE
isotope
conc_iso
reaction ;
SI (CONC_ISO()/=0) ;
->CONCENTRATION CONCENTRATION (CONC_ISO) ;
FINSI ;
CALCUL_MACRO ->EDL_MACRO_SAMPLE
MICRO (EDL_MICRO)
MILIEU (EDL_MILIEU)
(CONCENTRATION)
SECTION (reaction)
PAR_ECHANTILLON (isotope) (isotope) ;
FINPROC;
20
3.10 The PROCEDURES
• Call a procedure
ARCHIVE ‘ARFILE’ ->EDL_MILIEU MILIEU SPX 180 ;
ARCHIVE ‘ARFILE’ ->EDL_MICRO MICRO SPX 180 ;
->ISOTOPE ‘U235’ ;
->CONC_ISO 1. ;
->REACTION ‘FISSION’ ;
! The way below to call the procedure is also valid since the names of the variables
are similar to those used when the procedure has been created
CREATE_MACRO_SAMPLE;
21
3.11 The ARCHIVE utility
•
It allows :
-to create a file with his name and its initial space,
ARCHIVE ‘file_name’ INITIALISER nb-blocs long-blocs ;
-to store set in a file with binary format,
ARCHIVE ‘file_name’ << REMPLACER>> (FLUX_SET) FLUX TGV ERANOS ;
-to get back a set previously stored ,
ARCHIVE‘file_name’ ->FLUX _SET FLUX TGV ERANOS;
-to suppress a set previously stored,
ARCHIVE ‘file_name’ SUPPRIMER FLUX TGV ERANOS ;
-to print the list of the set stored in a file,
ARCHIVE ‘file_name’ CATALOGUE;
-to store this list and then utilize it.
ARCHIVE‘file_name’CATALOGUE ->CATAL_SET;
EDL_NOM (CATAL_SET) ->SET_NAME
22
3.12 The PARAM file
•
The way in which the GEMAT data management scheme works depends of
memory parameters. These parameters must be placed in an ASCII file named
PARAM.
•
This file is mandatory in the execution environment and contains :
ESOPE=nb-words,NTRK=nb-blocks,LTRK=size-blocks
nb-words: number of words which allows to allocate the workspace in RAM
memory needed by the job.
( 1 word = 4 or 8 bytes depending of the computer)
This size cannot exceed the memory space of the microprocessor.
nb-blocks: number of blocks of the overflow file
size-blocks: size of a block
23
3.13 The GEMAT errors
•
MESSAGE
---GEMAT ERROR -----3500000 ALLOCATION MEMOIRE INSUFFISANTE
GEMAT 9.4 (FEV 93) *** DUMP DE LA MEMOIRE GEREE PAR GEMAT ***
DONT 0 MOTS LIBRES EN ZONE DYNAMIQUE ET 0 MOTS LIBRES EN ZONE
FIXE
•
CAUSES
1.The ESOPE parameteristoo large
2.The ESOPE parameter has not been defined
•
REMEDY
1.Decrease the value of ESOPE
2.Assign a value to ESOPE
24
3.13 The GEMAT errors
•
MESSAGE
---GEMAT ERROR ---SUBROUTINE : NCMAC
---INSTRUCTION : 91
---SEGINI , ZAUX2
---PAS ASSEZ DE PLACE EN MEMOIRE
GEMAT 9.4 (FEV 93) *** DUMP DE LA MEMOIRE GEREE PAR GEMAT***
•
CAUSES
The program complains that there is not enough memory space for the calculation
it has been asked to perform
•
REMEDY
Increase the value of ESOPE
25
4. The multi-group and multi-temperature LIBRARIES
• Four sets of libraries can be used:
JEF-2.2 obtained directly from JEF2.2 evaluations
ERALIB1 obtained from the JEF-2.2 libraries by a statistical fitting on
integral experiments
JEFF-3.1 obtained directly from JEFF3.1 evaluations
ENDFB-VI.8 obtained directly from ENDFB-VI.8 evaluations.
26
4.1 JECCOLIB2 & ERALIB1
•The data are mainly coming from JEF2 evaluations, except for ERALIB1 libraries
which contain ajusted nuclear data values (elastic, inelastic, capture, n,Xn, fission…)
for the main nuclei :
235, 238U, 239, 240, 241, 242Pu, Zr, Gd, Al, 56Fe, 58Ni, 52Cr, Na, O, C, 10B,
bdH (H from H2O).
•There are 3 libraries with various group weighting (structure and flux):
the 1st one contains 41 isotopes (1968 groups), it is used for reference
calculations in any kind of application
the 2nd one contains 287 isotopes (172 groups), it is used for design calculations
in thermal spectra
the 3rd one contains 287 isotopes (33 groups), it is used for design calculations in
fast spectra
27
ASPILIB2P
The data are mainly coming from JEF2 evaluations. The library contains 58 isotopes
(175 groups VITAMIN-J group structure). Angular distributions for structural
materials cross-sections are more detailed than in other libraries. It is used for
shielding calculations.
DPA (Displacement Per Atom)
The values stored are doses for every reaction: capture, fission, elastic, inelastic.
There are 3 ASCII libraries (33, 172 and 175 groups), each of them containing 13
isotopes (iron, chromium and nickel elements). There are used for structural
damage calculations.
KERMA (Kinetic Energy Release in MAterials)
The values stored are total (i.e. neutron + gamma) and for every reaction (capture,
fission, elastic, inelastic).
There are 2 libraries (in ASCII format):
KERMA33 contains 52 isotopes (33 groups)
KERMA175 contains 40 isotopes (175 groups)
28
The following table indicates whether the energy boundaries of the different structure
allow a condensation from one to another
1968
175
172
33
15
1968
--
yes
yes
yes
yes
175
--
--
no
no
no
172
--
--
--
yes
yes
33
--
--
--
--
yes
15
--
--
--
--
--
Structure
Energy limits of the different structures (15 groups are used for sensitivity studies)
29
NB OF GROUPS 1968
UPPER E (eV)
175
172
33
1.964033E+07
1
1
1
1
1
1.947734E+07
2
1
1
1
1
1.931570E+07
3
1
1
1
1
1.915541E+07
4
1
1
1
1
1.899644E+07
5
1
1
1
1
1.883880E+07
6
1
1
1
1
1.868246E+07
7
1
1
1
1
1.852742E+07
8
1
1
1
1
1.837367E+07
9
1
1
1
1
1.822119E+07
10
1
1
1
1
1.806998E+07
11
1
1
1
1
1.792002E+07
12
1
1
1
1
1.777131E+07
13
1
1
1
1
1.762383E+07
14
1
1
1
1
1.747757E+07
15
1
1
1
1
……………………………………………………………………..
…………………………………………………….......................
5.000000E-02 1958
4.200000E-02
3.500000E-02
3.000000E-02
2.500000E-02
2.000000E-02
1.500000E-02
1.000000E-02
6.900000E-03
5.000000E-03
3.000000E-03
1.000000E-04
175
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
162
175
175
175
175
175
175
175
175
175
175
175
33
163
164
165
166
167
168
169
170
171
172
172
15
33
33
33
33
33
33
33
33
33
33
33
15
15
15
15
15
15
15
15
15
15
15
30
4.2 ECCO libraries JEFF 3.1
•They are binary files.
They can be converted into ASCII format (and vice-versa) by specific
ERANOS modules (BITOCI/CITOBI), but they must be in binary format to be used by
the ERANOS modules requiring libraries as input data (e.g.ECCO).
•The 1968-group library is rather large although it contains only the most important
nuclides for the reactor flux calculations. The 175, 172 and 33 group libraries contain
all the isotopes.
•They depend on a reference file which allows to associate a given nuclide to its
data. This file also contains nuclide characteristics (mass, disintegration constant,
released energies) common to all data files. The same reference file may be used
with several libraries under the strict condition that nuclides are in the same order.
This is the case for the 1968, 172 and 33 group libraries which all depend on a
unique file, while the 175-group library depends on another reference file.
31
4.2.1 THE 1968, 172 AND 33 ENERGY GROUPS LIBRARIES
The 1968 group library
•The 1968-group library contains fewer nuclides than the other ones: only the 112 first
nuclides from H1 to ccah2 are present.
•103 nuclides with P0 and P1 scattering, 293.6 573.6 973.6 1473.6 2973.6 K data,
free gas thermal scattering and probability table representation of resonance shielding
over the entire energy range
+
•9 compounds with P0 and P1 scattering, nuclide dependent multi-temperature cross
sections, thermal files (H-H2O, H-CH2, H-ZrHx, D-D2O, Be and Mg metal, Ca-CaH2,
H-CaH2 and C-graphite)
32
The 172 group library (XMAS group structure)
•103 nuclides condensed from the 1968 energy groups library: P0 and P1 scattering,
293.6 573.6 973.6 1473.6 2973.6 K data, free gas thermal scattering and probability
table representation of resonance shielding over the entire energy range
+
•9 compounds condensed from 1968 energy groups library: P0 and P1 scattering,
nuclide dependent multi-temperature cross sections, thermal files
+
•277 nuclides with P0 to P3 scattering, 293.6 573.6 973.6 K data, free gas thermal
scattering
33
The 33 energy groups library
•103 nuclides condensed from the 1968 energy groups library: P0 and P1 scattering,
293.6 573.6 973.6 1473.6 2973.6 K data, free gas thermal scattering and probability
table representation of resonance shielding over the entire energy range
+
•9 compounds condensed from the 1968 energy groups library: P0 and P1 scattering,
nuclide dependent multi-temperature cross sections, thermal files
+
•277 nuclides condensed from 172 energy groups library, P0-P3 scattering, 293.6
573.6 973.6 K data, free gas thermal scattering
+
•57 PSEUDO fission products :
19 global pseudo fission products for Na-cooled FRs (name=fp+fissile nuclide
name)
19 solid pseudo fission products for Na-cooled FRs (name=fps+fissile nuclide
name)
19 global pseudo fission products for gaz-cooled FRs with large amounts of C
containing structure (name=fpg+fissile nuclide name)
34
Nuclides presents only in 33 energy groups libraries:
fpTh232
fpU235
fpNp238
fpPu241
fpAm243
sfpTh232
sfpU236
sfpPu238
sfpPu242
sfpCm243
fpgU233
fpgU238
fpgPu239
fpgAm241
fpgCm244
fpU233
fpU236
fpPu238
fpPu242
fpCm243
sfpU233
sfpU238
sfpPu239
sfpAm241
sfpCm244
fpgU234
fpgNp237
fpgPu240
fpgAm242m
fpgCm245
fpU234
fpU238
fpNp237
fpPu239
fpPu240
fpAm241
fpAm242m
fpCm244
fpCm245
sfpU234
sfpU235
sfpNp237
sfpNp238
sfpPu240
sfpPu241
sfpAm242m
sfpAm243
sfpCm245
fpgTh232
fpgU235
fpgU236
fpgNp238
fpgPu238
fpgPu241
fpgPu242
fpgAm243
fpgCm243
35
4.3 ECCO libraries ENDFB 6.8
•
All data are coming from ENDFB 6.8 evaluations except Ar40, Ni59, In115 which
could not be processed and were taken from JEFF 3.1 evaluations.
•
320 Nuclides.
•
The 1968 group library:
The 1968-group library contains fewer nuclides than the other ones: only the 95
first nuclides from H1 to poly are present.
89 nuclides with P0 and P1 scattering, 293.6 573.6 973.6 1473.6 2973.6 K data….
+ 6 compounds with P0 and P1 scattering….
•
The 172 group library (XMAS group structure):
89 nuclides condensed from the 1968 energy groups library +
6 compounds condensed from 1968 energy groups library +
225 nuclides with P0 to P3 scattering, 293.6 573.6 973.6 K…..
36
•The 33 energy groups library:
89 nuclides condensed from the 1968 energy groups library +
6 compounds condensed from 1968 energy groups library +
225 nuclides condensed from 172 energy groups library….
4.4 ECCO libraries JENDL 3.3
•All data are coming from JENDL 3.3 evaluations except Au197 and Nb93 which
could not be processed and were taken from JEFF 3.1 evaluations.
•338 Nuclides.
……………………………………..
……………………………………..
……………………………………..
37
4.5 Processing scheme
•
Evaluated libraries in ENDF-6 format.
•
It mainly relies on two important processing codes;
NJOY (resonance integrals, fission spectrum averaged, Graphical plots
of cross sections, angular distributions and emitted spectra for all
isotopes and elements at all temperatures)
CALENDF (convert resolved and unresolved resonance parameters from
ENDF-6 structured evaluations, into temperature dependent pointwise cross-sections, it generates "cross-section probability
tables“ based on Gauss quadrature. These represent detailed
resonance self shielding within any of the groups and can be used
directly in the ECCO cell code)
and two interface codes:
MERGE
GECCO
all of which have been largely updated since the last ECCOLIB was generated.
Some major improvements have been achieved, in the format and physical
38
qualities of the basic JEFF-3.1 evaluations input.
39
40
The following 40 response functions, types and names, have been included in the
ECCO library tape when present in the original evaluation.
41
42
5. USER LANGUAGE
•It is the LU language of the ALOS system . Its basic instruction is the calling
sentence of a module.
•The calling sentence is formed as follows:
The first word is the module name which identifies the function.
The following terms are specified in the directions for use of the module.
• Generally , they are :
- Created or used SETS ,
- Directives to describe the data to be given by the user.
- The semicolon ; ends the sentence.
43
5. USER LANGUAGE
When the module name expresses without ambiguity the waited resulting SET , the
LU name of the variable SET ,preceded by an arrow ,will immediately follow the
module name :
CREATION_MACRO ->ma
When the module name expresses without ambiguity the used SET , the LU name of
the used SET ,between brackets ,will immediately follow the module name :
EDITION_MACRO (ma) ;
44
5. USER LANGUAGE
MODULE DESCRIPTION STANDARDS
<< .... >>
means that the data in square brackets are to be given 0 or 1 time
<< .... >>0
means that the data in square brackets are to be given 0 or N times
<< .... >>1
means that the data in square brackets are to be given 1 or N times
! ...
means that the data at the right are exclusive (one, and only one)
!! ...
means that the data at the right are optional , that they may exist all together,
and that at least one must exist.
45
6. Lattice calculation with ECCO
• Summary
Basic reactor modeling:
medium set creation 􀂄􀂄
operating conditions
ECCO sentence and steps
basic set creation for core calculation
Advanced topics:
heterogeneous cells
ECCO routes
ECCO step options
46
• Modeled Reactor
Na-cooled (U,Pu)O2fast reactor1250 MW (thermal) / 500 MW (electric)
Fuel S/A geometric data:
•169-pin bundle ; pin pitch = 0.878 cm
•Hexagonal wrapper across-flats = 11.65 cm (inner) x 12.37 cm (outer)
•S/A pitch = 12.87 cm ; Fissile height= 100 cm
•Integratedaxialblankets(same geometryas fissile)
•Lower/upperaxialblanket height= 25/25 cm
•Numberof fuel S/Asis the core= 255
Fertile S/A geometric data:
•61-pin bundle ; pin pitch = 1.445 cm
•Spacer wire diameter= 0.187 cm
•Hexagonal wrapper across-flats = 11.65 cm (inner) x 12.37 cm (outer)
•S/A pitch = 12.87 cm Fertile height= 150 cm
47
• Module sequence
MEDIUM_CREATION to create materials, medium and cells:
•MEDIUM set (output)
•Cell description needs medium
•Medium description needs materials
OPERATING_CONDITION to expand medium (optional):
MEDIUM set (input and output)
ECCO to perform lattice calculation:
MEDIUM set (input)
Ecco files (output)
BASIC_EDL_CREATION_FROM_ECCO_FILE to create edl:
MEDIUM set (input and output)
Ecco files (input)
MICRO and MACRO set (output)
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• Global Data
!---> EINT/EEXT = inner/outer volume (Pu+Am)O2/(U+Pu+Am)O2 in %
->EINT (25.0*0.74) ;
->EEXT 25.0 ;
!---> expansion coefficients :
->OXIDE_DIL 100 1.0528E-05 200 1.0553E-05 ... ;
->STEEL_DIL 100 1.707E-05 200 1.740E-05 ...;
->SODIUM_DIL 100 8.65600E-5 200 8.90300E-5 ...;
->B4C_DIL 100 0.4344E-5 200 0.4468E-5 ...;
!---> lists for (initial) trace nuclides :
->HN_TRACES
'U234' 1.0E-15 'U235' 1.0E-15 'U236' 1.0E-15 'U238' 1.0E-15 ... ;
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• MEDIUM_CREATION general
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• MEDIUM_CREATION simple material
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• MEDIUM_CREATION mixed material
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• MEDIUM_CREATION medium
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• MEDIUM_CREATION homogenous cell
• MEDIUM_EDITION
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