1. NAME AND TITLE
DUST: Albedo Monte Carlo Simulation of Neutron Streaming Through Multilegged Ducts.
Reactor Research Centre, Kalpakkam, Tamil Nadu, India.
3. CODING LANGUAGE AND COMPUTER
Fortran IV; IBM 370/155-II and IBM 3033.
4. NATURE OF PROBLEM SOLVED
DUST simulates the thermal neutron streaming through multilegged square concrete ducts.
5. METHOD OF SOLUTION
DUST uses the albedo Monte Carlo method. The albedo data used are in the form of empirical
formulae based on the measured doubly differential albedo data. Sampling of the reflected polar and
azimuth angles is done by the rejection method. Variance reduction devices such as Russian Roulette
6. RESTRICTIONS OR LIMITATIONS
The albedo data and the subroutines for sampling the reflected polar and azimuth angles are
specific for concrete ducts. The maximum number of legs (as specified by dimension statements) is
5 and the maximum number of dose points is 50. The dose points considered are only in the last leg
of the multilegged duct.
7. TYPICAL RUNNING TIME
For a square duct, 40 feet in length, DUST takes .05 seconds per history. Eight thousand histories
give the dose within a 15% statistical error in the case of straight ducts. The sample problem required
29.32 cpu seconds in the GO step on the IBM 3033 computer.
8. COMPUTER HARDWARE REQUIREMENTS
DUST was developed on the IBM 370/155-II computer and tested at RSIC on the IBM 3033
9. COMPUTER SOFTWARE REQUIREMENTS
The IBM 370, on which DUST was developed, runs IBM OS/VS, and the IBM 3033 used for
testing runs the IBM OS/VS2 operating system. At RSIC, DUST was compiled using the IBM Fortran
H Extended Enhanced compiler.
R. Indira, K. P. N. Murthy and R. Shankar Singh, "Albedo Monte Carlo Simulation of Thermal
Neutron Streaming Through Multilegged Ducts," FRG/01100/RP-217 (January 1982).
11. CONTENTS OF CODE PACKAGE
Included are the referenced document and one (1.2MB) DOS diskette which contains the source
code and sample problem input and output.
12. DATE OF ABSTRACT
KEYWORDS: ALBEDO; MONTE CARLO