mcnp从入门到精通讲座(8)

c *** Material Cards *** c

m1 92235 -94.73 92238 -5.27 $ U235/238 m2 1001 +1 8016 +2 $ water m3 13027 +1 $ Al c

c *** Print first 50 histories *** print 110 c

c *** time and nps cut cards *** nps 60 ctme 1

End of File

这一讲，就说到这里。

欲知后事如何，请听下一讲分解。*^_^*

第09讲，MCNP 几何部分 宏观物体定义曲面 练习题

MCNP 几何部分 宏观物体定义曲面 练习题 Geometry problems II – Macrobodies.

Repeat the first set of exercises - You should use Macrobodies in each case.

In each case you should try to predict how MCNP will assign each facet number - then check this using the plotter.

PROBLEMS:

5. A cylinder lying along the z-axis. Radius 5 cm height 10 cm. Make the cylinder from material U235 weight fraction 94.73, U238 weight fraction 5.27, material density 18.7g/cm3

6. The cylinder in 1. Surrounded by a 20 cm side length cube of water. Position the cylinder centrally in the water.

7. The geometry of problem 2, but with the cylinder rotated about the x-axis by 45 degrees.

8. An Al box, 2 cm wall thickness and internal side 20 cm. The box has a top and a bottom. Inside of the box place a 5 cm radius cylinder of height 10 cm laying long the z-axis. The cylinder should be central within the box. The space between the cylinder and box is filled with water. The Al walls are of density 2.7 g/cm3. The cylinder has the material properties described in problem 1.

Extension - Try problem 4 using a mixture of cells, surfaces and macrobodies.

练习题答案： 例五：

message: datapath=D:\\transport\\data\\mcnpxs

title -- P5 cylinder along z axis using MBs --- c c

c *** cell descriptions *** c

10 1 -1 -1 imp:n=1 $ cylinder c

20 0 +1 imp:n=0 $ outside world c

1 rcc 0 0 -5 0 0 10 5 $ Right circ. cyl along z-axis rad 5 cm, height 10 cm c

c *** Source Card*** c

sdef $ default source c

c *** Material Cards *** c

m1 92235 -94.73 92238 -5.27 $ U235/238 c

c *** Print first 50 histories *** print 110 c

c *** time and nps cut cards ***

nps 60 ctme 1

End of File

例六：

message: datapath=D:\\transport\\data\\mcnpxs

title -- P6 cylinder along z axis in H2O using MBs --- c c

c *** cell descriptions *** c

10 1 -1 -1 imp:n=1 $ cylinder c

20 2 -1 1 -2 imp:n=1 $ water c

30 0 +2 imp:n=0 $ outside world c

1 rcc 0 0 -5 0 0 10 5 $ Right circ. cyl along z-axis rad 1 cm, height 10 cm c

2 box +10 -10 -10 0 20 0 0 0 20 -20 0 0

c *** Source Card*** c

sdef $ default source c

c *** Material Cards *** c

m1 92235 -94.73 92238 -5.27 $ U235/238 m2 1001 +1 8016 +2 $ water c

c *** Print first 50 histories *** print 110 c

c *** time and nps cut cards *** nps 60 ctme 1

End of File

例七：

message: datapath=D:\\transport\\data\\mcnpxs

title --P7 cylinder in z-y plane rot. about x in H2O using Mbs ---MBs c c

c *** cell descriptions *** c

c ***************** Cylinder***** c

10 1 -6.45 -1 imp:n=1 $ cylinder c

20 2 -1 +1 -2 imp:n=1 $ water c

30 0 +2 imp:n=0 $ outside world c

1 rcc 0 -3.5355 -3.5355 0 7.0710 7.0710 5 c

2 box 10 -10 -10 0 20 0 0 0 20 -20 0 0

c *** Source Card*** c

sdef $ default source c

c *** Material Cards *** c

m1 92235 -94.73 92238 -5.27 $ U235/238 m2 1001 +1 8016 +2 $ water print 110 c

c *** time and nps cut cards *** nps 60 ctme 1

End of File

例八：

message: datapath=D:\\transport\\data\\mcnpxs

title -- P8 cylinder along z axis in box using MBs --- c c

c *** cell descriptions *** c

10 1 -1 -1 imp:n=1 $ cylinder c

20 2 -1 1 -2 imp:n=1 $ water c

25 3 -2.7 +2 -3 imp:n=1 $ Al box c

30 0 +3 imp:n=0 $ outside world c

1 rcc 0 0 -5 0 0 10 5 $ Right circ. cyl along z-axis rad 1 cm, height 10 cm c

2 box +10 -10 -10 0 20 0 0 0 20 -20 0 0 c

3 box +12 -12 -12 0 24 0 0 0 24 -24 0 0

c *** Source Card*** c

sdef $ default source c

c *** Material Cards *** c

m1 92235 -94.73 92238 -5.27 $ U235/238 m2 1001 +1 8016 +2 $ water m3 13027 1 $ Al c

c *** Print first 50 histories *** print 110 c

c *** time and nps cut cards *** nps 60 ctme 1

End of File

这一讲，就说到这里。

欲知后事如何，请听下一讲分解：MCNP源Source的描述。*^_^*

第10讲，MCNP源Source的描述

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