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7.5 Smearing and Collapsing of Group Constants It is one of the features of the SRAC code system to execute smearing and collapsing in separate steps and for the user to control the timing. The smeared cross-sections can be used by the succeeding cell calculation in the case of double heterogeneity. Smearing may be done by using the spatial distribution of the fluxes obtained by the cell calculation, over a whole cell or on partitioned regions which are specified by X-Region. Description will be also made for the optional calculation of cell averaged diffusion coefficient specified by IC17 in Sect.2.2. Next, discussions will be made on the optional use of neutron spectrum for collapsing, as we have several choices, as follows; (a) the asymptotic spectrum characterized by Maxwellian temperature stored in FASTU and THERMALU files (b) the spectrum to a mixture provided by the user in FLUX file, (c) the spectrum calculated by P 1 or B 1 approximation to an isolated mixture specified by IC16 which was used for the transport cross-sections of the mixture, (d) the spatially integrated spectrum of the flux obtained by the cell calculation, (e) if the above is for an infinite array of lattice cell, the spectrum recalculated by the P 1 or B 1 approximation activated by IC9 to include the leakage effect, where attention is paid to reflect this leakage correction on the space-dependent spectrum order to give the suitable reaction rate of depleting nuclide associated to the mixture to cell burn-up routine. Collapsing of energy group structure for few group core calculation is described with emphasis on the diffusion parameter. Description will be given using the following nomenclature. 278
Table 7.5-1 (1/2) Nomenclature Symbols Meaning g , g’ Multi-group number G , G' Few group number i , j A) In the collision probability method: T- or R-Region number, which is used as spatial index. B) For S N and diffusion calculation: fine mesh number m Material number for spatial region i or j, in other words, m-th M-Region which includes regions i or j. I X-Region number for editing region to which the average cross-section is given (usually I =1 is given throughout the system, except for the case where a super-cell model is used.) ( Note : i , j ∈ m ∈ I ) z n Nuclear reaction for process z (fission, capture, scattering, etc.) Nuclide. l Order of Legendre expansion ( l =0 or 1). χ Fission spectrum of material m. g,m n z , m, g σ Effective multi-group cross-section of nuclide n in material m (z = fission n z , m, G or capture), which is obtained by the interpolation of the self-shielding factors stored in FASTU and THERMALU files except for the resonance energy range II where hyper-fine group calculation or IR method can be used. This cross-section is kept in MICREF file in order to be used for cell burn-up calculation or for activation calculation. σ Effective few-group cross-section of nuclide n in material m (z = fission or capture) given to the cell burn-up routine but not kept. 279
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JAEA-Data/Code 2007-004 SRAC2006 :
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Contents 1. General Descriptions ..
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5.5 BWR Fuel Assembly Calculation (
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目次 1. 概要 ................
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5.4 三次元拡散計算 (CI
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1. General Descriptions 1.1 Functio
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essential programs of the integrate
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Sphere (Pebble, HTGR) 1D-Plate (JRR
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ecause the scattering cross-section
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As shown in Fig.1.4-1, one PDS file
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1.5.1 Fast Fission Energy Range (10
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i n m≠n i n i n i n i 1 i i g( C
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mixture(s) having resonant nuclides
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thermal energy range. In the fixed
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1.10 Calculation Scheme In Fig.1.10
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3 2 1 CALL MICREF [20] CALL REACT C
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homogenized P 1 spectrum obtained a
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Consequently next step ’CALL MACR
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1.11 Output Information Major calcu
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(4) A floating number may be entere
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2.2 General Control and Energy Stru
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cell. = 2 The PEACO routine (hyperf
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should be avoided for the core wher
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Note: Usually IC15=1 is used in FBR
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Behrens’ term of the Benoist mode
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Only the first character (capital l
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NET ∑ i= 1 NEGT( i ) =(Total numb
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Block-1 Control integers /18/ 1 IGT
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asymmetric cell is surrounded by en
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= 0 Isotropic (white) reflection =
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degree for the numerical angular in
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3 EPSG Extrapolation criterion 4 R
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Block-10’ Required if IGT=11, or
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= 2 Neutron from moderator = 3 Neut
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Unit Cell Periodic B.C. 4 2 3 1 RX(
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NX=4 NTPIN=6 NAPIN=1 NPIN(1)=6 6 ID
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RDP(1)=0.0 RDP(2) RDP(3) 14 13 12 R
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2.5 ANISN ; One-dimensional S N Tra
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7 IBR Right boundary condition, sam
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22 IPM Angular dependent incident s
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EV = best guess for α or 0.0 when
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Block-04* Positions of interval bou
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2.6 TWOTRAN ; Two-dimensional S N T
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Note: The original TWOTRAN uses two
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= 0 (internally set) 19 IHM Total n
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= 3 R-θ 31 IEDOPT Edit options. =
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= 1 Yes Block-4 Control floating po
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Repeat Block-20 through Block-21, N
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2.7 TUD ; One-dimensional Diffusion
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= 1 Monitor print at each inner ite
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equation is applied to meshes, the
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Pin Plate D2 D2 D1 D1 In cylindrica
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XYZ(1,2) Y-abscissa of the top side
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READ(9) (WORK(J+I),I=1,NDATA) END D
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absorption cross-section, each of w
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ITMX19 The upper limit of CPU time
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corner and there are the same numbe
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NUAC19 Override use of Chebychev po
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NUAC17 > 0 The constant for all gro
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ottom starting with a new card. For
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Card-006-3 Specification of meshes
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4 SIG3 Absorption cross-section (
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2 NFX2 Optional print control = 0 N
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Region 1 Region 2 Left Right X/R/R
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X T 22*11 Meshes 1 Mesh = 1 Region
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2.9 Material Specification ’Mater
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fuel pin: MU08F0U2 and those in MOX
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hydrogen, add character ‘0’ to
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Usually, enter IRES=2 for the heavy
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2.10 Reaction Rate Calculation The
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Block-1 Control integers for reacti
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3 U238 The position of the second n
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2.11 Cell Burn-up Calculation The i
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= 2 Information for debugging = 3 D
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chains under consideration is enlar
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MACROWRK file. 2 INTSTP Step number
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Block-8-1 Required if IBC6=1 /1/ NM
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e avoided. Because U08W and U080 ar
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2.12 PEACO ; The hyperfine Group Re
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3. I/O FILES We shall describe the
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(E(g),g=1,NGF+1) structure. Boundar
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LTH(1) = (LD(1)+1)*LA(1), ordered a
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Background cross-sections Member Yz
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INT(2) = 0 K-member only without sc
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Member name Contents **************
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(WEIGHT(g),g=1,NGF) Lethargy widths
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3.1.5 Fine Group Macroscopic Cross-
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Member mmmmebfM or caseebxM /10*ng+
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Member caseBNUP Material-wise burn-
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Initial inventory in the restart ca
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(YDIOX(j),j=1,NOWSTP) Fission yield
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(n/cm 2 /sec*cm 3 ), NRR is number
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3.2.1 Common PS Files The following
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3.2.5 PS files for TUD The PS files
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at the first column. Block-1-1 Numb
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= ‘DAYS’ days = ‘YEARS’ yea
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GD156 XGD60001 641560 154.660 0 0 0
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: ZZ050 1.50080E+00 *FP-Yield-Data
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Kr83 Zr95 fission β + decay, EC (n
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Ge73 Ge74 As75 Ge76 fission β + de
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4. Job Control Statements In this c
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~SRAC/tool/lmmake/lmmk/lmmk.sh, whi
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5. Sample Input Several typical exa
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613.0 650.0 760.0 769.0 & cooling 7
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5 5 5 5 5 5 & 5 5 5 5 5 5 & 1 2 3 4
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5.3 S N Transport Calculation (PIJ,
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XFEN0001 2 0 5.78720E-02 XNIN0001 2
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Water reflector Extrapolated B.C. B
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1 1 1 1 1 1 1 2 3 008 -2 1 1 999 /
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Note: This sample is time consuming
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XCRN0008 0 0 1.55546E-02 XNIN0008 0
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****** Input for material specifica
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T-Region R-Region X-Region Reflecti
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6. Utility for PDS File Management
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To read in the microscopic cross-se
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7. Mathematical Formulations 7.1 Fo
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scattering kernel at point r’ fro
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The integration by R between R j- a
Page 239 and 240: G j Pij ( lattice) = Pij ( isolated
Page 241 and 242: We, however, should take care of th
Page 243 and 244: 2 = ρ 2 + x r sin β = ρ R = x
Page 245 and 246: 1 i ∑ − 1 k = j+ 1 λ ij = λ k
Page 247 and 248: where λ λ 1 is 2 is = = N ∑ k k
Page 249 and 250: 2π ri −1 Pij = − Σ ∫ ρdρ
Page 251 and 252: In Fig.7.1-5, the line PQ’ define
Page 253 and 254: pin rod are divided into four regio
Page 255 and 256: the arrays T and II, respectively.
Page 257 and 258: Note that among four terms appearin
Page 259 and 260: If a group-dependent form of Fick
Page 261 and 262: 7.3 Optional Processes for Resonanc
Page 263 and 264: 7.3.2 Table-look-up Method of f-tab
Page 265 and 266: has been introduced for the correct
Page 267 and 268: ϕ i ( 0 u ) = ∑ Pij ( u) W j ( u
Page 269 and 270: Geometry b i m f b f −( γ + γ )
Page 271 and 272: will be seen in the reference 65) .
Page 273 and 274: The lattice cell under study may co
Page 275 and 276: (2) Two resonance-absorbing composi
Page 277 and 278: One of the physical problems associ
Page 279 and 280: and V = V + V , F f m where Σ m ,
Page 281 and 282: We shall discuss the following two
Page 283 and 284: where X = 2R p ( Σ C = 2R πρ R p
Page 285 and 286: • the reduced collision probabili
Page 287 and 288: The root mean square (RMS) residual
Page 289: group flux and for the fast group f
Page 293 and 294: 7.5.1 Smearing Smearing or spatial
Page 295 and 296: 7.5.2 Spectrum for Collapsing The f
Page 297 and 298: Here, an equivalent relation holds
Page 299 and 300: 1 F = K ∑∫ g * χ g ( r) ϕ g (
Page 301 and 302: M dN i ( t) M = ∑ f j→iλ j N i
Page 303 and 304: 8. Tables on Cross-Section Library
Page 305 and 306: Table 8.1-2 (2/2) Element index (zz
Page 307 and 308: JEFF-3.0 are based on other nuclear
Page 309 and 310: Table 8.2-1 (1/8) List of SRAC publ
Page 317 and 318: 8.3 Energy Group Structure The ener
Page 319 and 320: (4) Upper Boundary of PEACO Routine
Page 321 and 322: References 1) K. Tsuchihashi, H. Ta
Page 323 and 324: Experiment,” J. Nucl. Sci. Techno
Page 325: 75) K. Tasaka : “DCHAIN: Code for
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