JAEA-Data/Code 2007-004 - Welcome to Research Group for ...

home/okumura/SRACLIB-JDL33/pds/pmcrs O F
/home/okumura/MyPDS/Test/UFAST
Scratch Core
/home/okumura/MyPDS/Test/UTHERMAL
/home/okumura/MyPDS/Test/UMCROSS
S
S
C
C
/home/okumura/MyPDS/Test/MACROWRK S C
/home/okumura/MyPDS/Test/MACRO
/home/okumura/MyPDS/Test/FLUX
New
New
C
C
/home/okumura/MyPDS/Test/MICREF S C
Block-6 Specification for energy group structures /4/
1 NEF Number of the fast neutron groups of the User Fast Library (NEF ≤ 74)
2 NET Number of the thermal neutron groups of the User Thermal Library;
(NET ≤ 48, and NEF+NET ≤ 107).
Enter 0, if IC4 = 0 (no thermal group calculation) in Block-3
3 NERF Number of the fast few-groups
If no collapsing is required (IC10=0 and IC13=0), enter NERF=0.
4 NERT Number of the thermal few-groups
If no collapsing is required (IC10=0 and IC13=0) or no thermal group calculation
(IC4=0), enter NERT=0.
Block-7 Collapsing from PFAST into UFAST /NEF/
NEGF(i) Number of the public fast groups in each user fast group (i)
See the table of energy group structure in Sect. 8.3.
NEF
∑
i=
1
NEGF( i ) =(Total number of public fast groups included between 10 MeV and
the thermal-cut-off energy). By this item, the thermal-cut-off energy is decided.
As the thermal-cut-off energy has to be any of lower energy boundaries of
Public energy group structure between 3.9278 eV and 0.41399 eV, set NEGFs so as
NEF
to satisfy 59 ≤ NEGF( i)
≤ 74.
∑
i= 1
The recommended cut-off-energy in the SRAC code is about 2.0 eV (cf. Sect.1.3)
Block-8 Collapsing from PTHERMAL into UTHERMAL, Required if NET ≠ 0 /NET/
NEGT(i) Number of the public thermal groups in each user thermal group (i)
See the table of energy group structure in Sect. 8.3.
42