# Beginner MCNP

1. Apr 17, 2015

### ISAAC BAIDOO

I just started learning MCNP for research reactor analysis. Can anybody advise where and how I could easily get material to read and practice

2. Apr 18, 2015

### Ibrahim Hany

3. Apr 21, 2015

### ISAAC BAIDOO

4. Apr 24, 2015

### Ibrahim Hany

You can install the VisEd, it is a good visualizing tool and also you may run on it.

Or you can start a batch file ( in the folder of the input file ) with the command:

MCNP5 (or whatever the version you are using) I=name of the input file with extension O=name of the output file with extension

5. Apr 28, 2015

### ISAAC BAIDOO

Dear Sir,
Thank you so much for your eagerness to help.
kindly explain to me the following:
1. Can you tell me what LCS: error in MCNPX
I got the LCS error prompt from running the input file below:
example 4-3, repeated structure, two cylinders
C cell cards
1 1 9.90605e-2 -1 -4 5 u=3 imp:n=1 $solution 2 0 -1 4 u=3 imp:n=1$ void region
3 2 -2.7 1:-5 u=3 imp:n=1 $Al container 4 0 -2 -3 6 fill=3 imp:n=1 5 like 4 but trcl (17 0 0) imp:n=1 6 3 -1.0 10 -11 8 -9 7 -3 #4 #5 imp:n=1 7 0 -10:11:-8:9:-7:3 imp:n=0 C surface cards 1 cz 6.35$ solution radius
2 cz 6.50 $3 pz 80.0$ top of container
4 pz 70.2 $top of solution 5 pz 0.0 6 pz -0.15 7 pz -20.15$ bottom of tank
c sides of tank
8 px -16.5
9 px 43.5
10 py -26.5
11 py 26.5
c data cards
c materials cards
m1 1001.62c 6.2210e-2 8016.62c 3.3621e-2
9019.62c 2.5161e-2 92235.66c 1.1760e-2
92238.66c 8.2051e-5
mt1 lwtr.60t
m2 13027.62c 1.0
m3 1001.62c 2 8016.62c 1
mt3 lwtr.60t
c control cards
kcode 5000 1.0 50 250
ksrc 0 0 35 17 0 35

I was trying this example from the mcnp primer, but whiles running, it stopped at the 192nd cycle and indicated “LCS error”
1. I would want to know how I can execute basic plot command.
The primer indicates I could execute plot command by “mcnp inp=filename ip” or mcnp ip inp=filename. I expect to see the “The default plot is a PX slice centered at (0, 0, 0) with an extent of -100 cm to 100 cm on the Y-axis and -100 cm to 100 cm on the Z-axis” as indicated in the primer. Instead, the is the error comment I get, “bad trouble in mcnpx in routine unique cannpt create outp
In fact, the main problem is how to use the command to display the plot for now before I begin to think about how to make in unique.
Best Regards
Isaac Kwasi Baidoo

6. Feb 10, 2016