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Fatal Error in MCNP6

  1. Jun 14, 2017 #1
    Hello everyone here,

    I do need your help in this matter, please kindly help me solve this problem. I am new to this forum and now am seeking for help.

    I am new to MCNP code, and I run MCNP6 code using BURN card and it give me fatal error say "Model required. Cannot use memory reduction option".

    the whole input are below

    C FUEL ASSEMBLY 17x17
    C ==== fuel, Universe 1 =====================
    1 1 -10.176 -1 u=1 vol=105.30977 imp:n=1
    3 2 -6.56 1 -3 u=1 imp:n=1
    4 3 -0.998207 3 u=1 imp:n=1
    c ===== Guide Tube Uinverse 4================
    6 3 -0.998207 -10 u=4 imp:n=1
    7 2 -6.56 10 -11 u=4 imp:n=1
    8 3 -0.998207 11 u=4 imp:n=1
    c ===== Instructmentation Tube Universe 5====
    10 3 -0.998207 -10 u=5 imp:n=1
    11 2 -6.56 10 -11 u=5 imp:n=1
    12 3 -0.998207 11 u=5 imp:n=1
    c ========= SLOBA 15% Universe 3=============
    13 5 -3.52 -50 u=3 vol=25.13274 imp:n=1
    14 6 -0.001205 50 -51 u=3 vol=60.88407 imp:n=1
    15 2 -6.56 51 -52 u=3 vol=4.712389 imp:n=1
    16 5 -3.52 52 -53 u=3 vol=14.89115 imp:n=1
    17 6 -0.001205 53 -54 u=3 vol=11.42193 imp:n=1
    18 2 -6.56 54 -55 u=3 vol=25.31963 imp:n=1
    19 3 -0.99827 55 u=3 vol=176.3183586 imp:n=1
    c ===== Lattice Assembly ====================
    100 3 -0.998207 -12 13 -14 15 4 -5 u=10 lat=1 imp:n=1 &
    fill=-8:8 -8:8 0:0 &
    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 & $ 1
    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 & $ 2
    1 1 3 1 1 4 1 1 4 1 1 4 1 1 3 1 1 & $ 3
    1 1 1 4 1 1 1 1 1 1 1 1 1 4 1 1 1 & $ 4
    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 & $ 5
    1 1 4 1 1 4 1 1 4 1 1 4 1 1 4 1 1 & $ 6
    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 & $ 7
    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 & $ 8
    1 1 4 1 1 4 1 1 5 1 1 4 1 1 4 1 1 & $ 9
    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 & $ 10
    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 & $ 11
    1 1 4 1 1 4 1 1 4 1 1 4 1 1 4 1 1 & $ 12
    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 & $ 13
    1 1 1 4 1 1 1 1 1 1 1 1 1 4 1 1 1 & $ 14
    1 1 3 1 1 4 1 1 4 1 1 4 1 1 3 1 1 & $ 15
    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 & $ 16
    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 $ 17
    101 3 -0.998207 -16 17 -18 19 4 -5 fill=10 imp:n=1
    102 2 -6.56 -20 21 -22 23 4 -5 #101 imp:n=1
    103 0 20:-21:22:-23:-4:5 imp:n=0

    c ========= Fuel Pin ==========
    c /////surface card//////
    c ======fuel pin======
    1 cz 0.4095
    2 cz 0.4175
    3 cz 0.4750
    c ===surface===
    *4 pz -100
    *5 pz 100
    C =========guide tube=======
    10 cz 0.57
    11 cz 0.61
    C ===========Lattice===================
    12 px 0.627
    13 px -0.627
    14 py 0.627
    15 py -0.627
    C ====Assembly=====
    16 px 10.659
    17 px -10.659
    18 py 10.659
    19 py -10.659
    c =====Surround of assembly===========
    *20 px 10.75
    *21 px -10.75
    *22 py 10.75
    *23 py -10.75
    c ======SLOBA geometry================
    50 cz 0.2000
    51 cz 0.3700
    52 cz 0.3800
    53 cz 0.4100
    54 cz 0.4316
    55 cz 0.4760

    C ======== Data Card ==========
    kcode 1000 1.0000 50 200
    ksrc 10.032 0 0 -10.032 0 0
    0 10.032 0 0 -10.032 0
    10.032 10.032 0 -10.032 -10.032 0
    BURN TIME 0.1 0.2 0.3 0.4 1 2 10 15 25
    POWER 1.0
    MAT 1
    MATVOL 86552.05632
    BOPT 1 14 1
    OMIT=1 8 90233 90234 91232 93235 93236 93239 94236 94237
    C ======== Material Card ======
    c UO2 d=10.17g/cc
    m1 92235 -0.0436342
    92238 -0.837866
    8016 -0.1185
    c --- cladding Zircaloy-4 d=6.560 g/cc ----------
    m2 8016 -0.001196
    24000 -0.000997
    26000 -0.001994
    40000 -0.981858
    50000 -0.013955
    c -------water d=1g/cc
    m3 1001 -0.111894 8016 -0.888106
    c -------He gas d=0.000166
    c m4 2004 -1.0
    c -------SLOBA 15% B4C-Al2O3 d=3.520 g/cc
    m5 5010 -0.023470
    5011 -0.093910
    8016 -0.400130
    24000 -0.449860
    6000 -0.032600
    c -------Air d=0.001205g/cc
    m6 6000 -0.000124
    7014 -0.755268
    8016 -0.231781
    18000 -0.012827
    ==================================================

    please kindly help, and i couldn't find the problem at all.
     
  2. jcsd
  3. Jun 20, 2017 #2
    Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.
     
  4. Aug 15, 2017 at 6:21 PM #3
    I also ran into this problem. My source file is a bit more complex, but it boiled down to the following problem:

    1. Physics models were disabled. Why? Dunno. It seems like literally every source file I write I get this message.
    2. An isotope without tables was encountered.
    3. In order to estimate the behavior of this isotope under radiation it needs to have physics models enabled or a lookup table in the burn up.

    In your out file there should be a line telling you what zaid of the isotope(s) it's choking on, for me this happened to be 64151 (which is a stable isotope of Gadolinium apparently, I never specified it in my input file, but I guess as part of the burnup calculation it was generated.)

    Here's my omit block:

    OMIT=-1 114,6014,7016,8018,9018,10021,10022,12023,
    12027,13026,13028,14027,14031,16031,16037,
    17034,17036,17038,18037,18039,18041,18042,
    19042,19038,19043,20039,20041,20045,20047,
    21044,21046,21047,21048,2045,22051,223047,
    23048,23049,23050,23052,23053,23054,24049,
    24051,24052,24055,24056,25051,25052,25053,
    25054,25056,25057,25058,26053,26055,26059,
    26060,27057,27060,27061,27062,27063,28057,
    28063,28065,29062,29064,29066,30064,30065,
    30066,30067,30068,39087,39092,39093,40088,
    40089,40097,41091,41092,41093,41096,41097,
    41098,41099,41100,42093,42091,42101,43097,
    43098,44097,54127,56131,58137,64151,90231,
    90234,90233,91230,91232,93235,93236,94243,
    94244,94236,94237,95240,95244,97245,97246,
    97247,97248
     
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