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7.5.3 Collapsing of Group Constants Collapsed group cross-sections for the few group calculations are obtained from the following prescriptions. Description will be also given for the transport cross-section and diffusion coefficient in the next subsection. ∑ n n z, m, G = σ z, m, g g∈G σ Φ m, g / Φ m, G ( z = f or c) (7.5-18) ∑ χ (7.5-19) I , G = χ I , g g∈G ∑ Σ z , I , G = Σ z, I , g Φ I , g / Φ I , G (7.5-20) g∈G ∑ ν Σ f , I , G = νΣ f , I , g Φ I , g / Φ I , G (7.5-21) Σ g∈G = ∑ ∑ s0 , I , G→G' s0, I , g→g ' I , g / I , G (7.5-22) g∈G g ' ∈G' Σ Φ Φ Here the multi-group diffusion coefficients are assumed for each homogenized X-Region (zone). The group-dependent diffusion equation in the I-th region can be written as 2 − D I , g∇ Φ ( r) + Σt, I , gΦ ( r) = S ( r) . g g g Let us sum up the above equation over g to collapse the multi-group equation into the few groups and denote each few group by G, then we have for the diffusion term where and − ∑ g∈G 2 ∑ D I , g∇ ϕ ≈ B D I , gϕ ( r) = B D I , G Φ I , G ≈ −D I , G∇ Φ I , ∑ g∈G g 2 g∈G g 2 Φ I , G ≡ Φ I , g (7.5-23) D I G ≡ D I , g Φ I , g / Φ I , G . (7.5-24) , ∑ g∈G Hence, the few group transport cross-sections can be defined by Φ I , g Σtr I , G = 3Φ I , G D I , g Φ I , g = Φ I , G . (7.5-25) , ∑ ∑ g∈G g∈GΣ tr, I , g 2 G 284
Here, an equivalent relation holds as 1 Σ tr, I , G = (7.5-26) 3D h, I , G For the isolated mixture which is not used in the cell calculation, by using either of the spectra on the items (a), (b) and (c) in the second paragraph of Sec.7.5, the procedure mentioned above is taken. A special treatment is available for a strongly absorbing material where the diffusion equation does not hold, if IC17= -1 is entered by ∑ Σtr , I , G = Σ tr, I , g Φ I , g / Φ I , G (7.5-27) g∈G The selection of the definition by IC17 results in the SRAC macroscopic format as shown in Table 7.5-1. Table 7.5-1 Selection of diffusion coefficient by IC17 IC17 Σ total D1 D2 1 Σ tr , I , g 25* D h, g 24 D t, g 24 2 Σ tr , I , g 25 D 0 , g 24 D t, g 24 3 Σ tr , I , g 25 D radial, g or D ⊥ , g 24 D axial, g or D||, g 24 -1 Σ tr , I , g 27 D h, g 24 D t, g 24 Note * Number following the definition denotes the equation number in this section to show how to collapse the quantity into the few group constant. 285
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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
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G j Pij ( lattice) = Pij ( isolated
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We, however, should take care of th
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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 and 290: group flux and for the fast group f
Page 291 and 292: Table 7.5-1 (1/2) Nomenclature Symb
Page 293 and 294: 7.5.1 Smearing Smearing or spatial
Page 295: 7.5.2 Spectrum for Collapsing The f
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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